Section 07-01A: Transmission, Automatic, A4LD
1993 Mustang Workshop Manual
DIAGNOSIS AND TESTING

Hydraulic/Mechanical Electrical Diagnosis Guides

 
ConditionPossible SourceAction
  • Torque converter clutch does not engage.
  • Torque converter clutch solenoid is not being energized electrically. Wires to solenoid shorted or an open circuit.
  • Transmission case connector not seated.
  • Open or short circuit inside of solenoid.
  • Malfunctioning engine coolant temperature sensor.
  • Malfunctioning manifold absolute pressure sensor.
  • Malfunctioning throttle position (TP) sensor
  • Vacuum line disconnected from the MAP sensor.
  • Perform EEC-IV diagnostic check — key on, engine off.

    NOTE: Refer to the Powertrain Control/Emissions Diagnosis Manual — EEC Quick Test Procedures.

 
  • Circuit continuity: 3-4 solenoid wire pin 52 should read approximately 20 ohm resistance.
  • Check circuit continuity with Breakout Box T83L-50-EEC-IV and Rotunda Digital Volt-Ohmmeter 105-00053 or equivalent. Check power pin No. 57 (red lead) and 3-4 pin 52 (black lead).
 
  • Brake switch malfunction.
  • Perform EEC-IV diagnostic check — engine running.

    NOTE: Refer to the Powertrain Control/Emissions Diagnosis Manual— EEC Quick Test Procedures.

 
  • Malfunctioning PCM.
  • Run diagnostic check on PCM.

    NOTE: Refer to the Powertrain Control/Emissions Diagnosis Manual— EEC Quick Test Procedures.

 
  • Torque converter clutch solenoid is being energized electronically but foreign material on solenoid valve is preventing valve closure.
  • Remove transmission oil pan. Remove valve body. Remove solenoid and check operation of solenoid. Clean if necessary.
 
  • Torque converter clutch shuttle valve stuck in unlock position (against plug) or too high a load spring.
  • Remove valve body. Check operation of torque converter clutch shuttle valve. Remove any contamination. Spring load should be approximately 2.0 lb. at 0.512 inch.
 
  • Torque converter clutch shift valve stuck in downshift position.
  • Remove valve body. Check operation of torque converter clutch shift valve. Remove any contamination. Be sure valve moves freely.
 
  • Torque converter internal malfunction preventing lock-up piston application.
  • Remove transmission. Replace converter.
  • Torque converter clutch always engaged even at zero road speed. (Symptom: vehicle will move only when the engine is accelerated to a high rpm and transmission selector lever is placed into (D).)
  • Torque converter clutch shift valve stuck in lock position.
  • Remove transmission valve body. Check to see that torque converter clutch shift valve moves freely.

    NOTE: Refer to the Powertrain Control/Emissions Diagnosis Manual— EEC Quick Test Procedures.

 
  • Torque converter clutch shuttle valve stuck in locked position.
  • Remove valve body. Check torque converter clutch shuttle valve for ease of movement.
 
  • Lock-up piston in torque converter will not disengage.
  • Remove transmission. Replace converter.
  • Torque converter clutch will not disengage on coastdown.
  • Malfunctioning throttle position sensor (should unlock at closed throttle).
  • Perform EEC-IV diagnostic check — key on, engine off.

    NOTE: Refer to the Powertrain Control/Emissions Diagnosis Manual— EEC Quick Test Procedures.

 
  • Torque converter clutch solenoid sticking.
  • Remove valve body. Check operation of solenoid. Replace if required.
  • Slow initial engagement.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Damaged or improperly adjusted manual linkage.
  • Service or adjust manual linkage.
 
  • Contaminated fluid.
  • Perform fluid condition check.
 
  • Improper clutch and band application, or low main control pressure.
  • Perform control pressure test.
  • Rough initial engagement in either forward or reverse.
  • Improper fluid level.
  • Perform fluid level check.
 
  • High engine idle.
  • Refer to the Powertrain Control/Emissions Diagnosis Manual.
 
  • Looseness in the driveshaft. U-joints or engine mounts.
  • Service as required.
 
  • Improper clutch or band application, or oil control pressure.
  • Perform control pressure test.
 
  • Sticking or dirty valve body.
  • Clean, service or replace valve body.
 
  • Torque converter clutch not disengaging.
  • Check torque converter clutch engagement/disengagement.
  • Harsh engagements — (warm engine).
  • Improper fluid level.
  • Perform fluid level check.
 
  • Engine curb idle speed too high.
  • Check engine curb idle speed. Refer to the Powertrain Control/Emissions Diagnosis Manual.
 
  • Valve body bolts — loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination. Service as required.
ConditionPossible SourceAction
  • No/delayed forward engagement (reverse OK).
  • Improper fluid level.
  • Perform fluid level check.
 
  • Manual shift cable misadjusted/damaged.
  • Check and adjust or service as required.
 
  • Low main control pressure (leakage). Forward clutch center support seal rings leaking.
  • Control pressure test, note results.
 
  • Forward clutch assembly burnt/damaged/leaking. Check ball in cylinder/leaking piston seal rings.
  • Perform air pressure test.
 
  • Valve body bolts — loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination. Service as required.
 
  • Transmission filter plugged.
  • Replace filter.
 
  • Pump damaged, leaking.
  • Visually inspect pump gear. Replace pump if necessary.
  • No/delayed reverse engagement (forward OK).
  • Improper fluid level.
  • Perform fluid level check.
 
  • Manual shift cable misadjusted/damaged.
  • Check and adjust or service as required.
 
  • Low main control pressure in reverse.
  • Control pressure test.
 
  • Reverse clutch assembly burnt/worn/leaking check ball in piston/leaking piston seal rings.
  • Perform air pressure test.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination. Service as required.
 
  • Transmission filter plugged.
  • Replace filter.
 
  • Pump damaged.
  • Visually inspect pump gears. Replace pump if necessary.
 
  • Low/reverse servo piston seal cut/leaking.
  • Perform air pressure test. Check and replace piston seal. Check and replace low/reverse band.
  • No engagement or drive in forward (any position) or reverse.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Low main control pressure.
  • Control pressure test.
 
  • Mechanical damage.
  • Check splines on turbine, input shaft and overdrive carrier, overdrive one-way clutch, center shaft, forward clutch, forward carrier and output shaft. Replace if necessary.
  • No engagement/drive in (D)or D (2 and 1 OK).
  • Manual shift cable misadjusted.
  • Adjust manual shift cable.
 
  • Rear one-way clutch damaged.
  • Replace rear one-way clutch.
 
  • Dirty/contaminated transmission fluid.
  • Clean transmission and valve body.
 
  • Overdrive one-way clutch damage.
  • Repair or replace.
  • Vehicle creeping in neutral.
  • Forward clutch failing to disengage.
  • Clean transmission.
  • No/delayed reverse engagement and/or no engine braking in manual low (1).
  • Improper fluid level.
  • Perform fluid level check.
 
  • Shift cable out of adjustment.
  • Service or adjust cable.
 
  • Low reverse servo piston seal leaking.
  • Check and replace piston seal.
 
  • Low reverse band burnt or worn.
  • Perform air pressure test.
 
  • Overdrive clutch, overdrive one-way clutch damaged.
  • Replace as required.
 
  • Polished, glazed low/reverse band or drum.
  • Service or replace as required.
 
  • Rear one-way clutch damaged.
  • Replace.
  • No engine braking in manual second gear.
  • Intermediate band out of adjustment.
  • Adjust intermediate band.
 
  • Improper band or clutch application, or oil pressure control system.
  • Perform control pressure test.
 
  • Intermediate servo leaking.
  • Perform air pressure test of intermediate servo for leakage. Service as required.
 
  • Overdrive clutch, overdrive one-way clutch damaged.
  • Replace as required.
 
  • Glazed band.
  • Service or replace as required.
  • Forward engagement slips/shudders/chatters.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Manual shift cable misadjusted/damaged.
  • Check and adjust or service as required.
 
  • Low main control pressure.
  • Control pressure test.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination. Service as required.
 
  • Forward clutch piston ball check not seating/leaking.
  • Replace forward clutch piston. Service transmission as required.
 
  • Forward clutch piston seals cut/worn.
  • Replace seal and service clutch as required.
 
  • Overdrive one-way clutch damaged.
  • Replace as required.
 
  • Rear one-way clutch damaged.
  • Determine cause of condition. Service as required.
  • Reverse shudder/chatter/slips.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Low main control pressure in reverse.
  • Control pressure test.
 
  • Low-reverse servo leaking.
  • Air pressure test. Visually inspect seal rings and piston bore.
 
  • Overdrive and/or rear one-way clutch damaged.
  • Determine cause of condition. Service as required.
 
  • Overdrive and/or rear reverse-high clutch drum bushing damaged.
  • Determine cause of condition. Service as required.
 
  • Overdrive and/or rear reverse-high clutch center support seal rings/ring grooves worn/damaged.
  • Determine cause of condition. Service as required.
 
  • Overdrive and/or rear reverse-high clutch piston seals cut/worn.
  • Determine cause of condition. Service as required.
 
  • Low-reverse servo piston damaged/worn.
  • Service as required.
 
  • Low-reverse band out of adjustment or damaged.
  • Adjust and inspect low-reverse band.
 
  • Looseness in the driveshaft, U-joints or engine mounts.
  • Service as required.
 
  • Low/reverse servo piston/seals or bores damaged.
  • Perform air pressure check.
 
  • Contamination blockage in cooler lines, in-tank radiator or auxiliary cooler.
  • Perform transmission fluid cooler flow check.
  • No drive, slips or chatters in first gear in (D) D. All other gears normal.
  • Damaged or worn rear one-way clutch.
  • Service or replace rear one-way clutch.
  • No drive, slips or chatters in second gear.
  • Intermediate band out of adjustment.
  • Adjust intermediate band.
 
  • Improper band or clutch application, or control pressure.
  • Perform control pressure test.
 
  • Damaged or worn intermediate servo piston and/or internal leaks.
  • Perform air pressure test.
 
  • Dirty or sticking valve body.
  • Clean, service or replace valve body.
 
  • Polished, glazed intermediate band or drum.
  • Replace or service as required.
ConditionPossible SourceAction
  • Starts up in second or third.
  • Improper band and/or clutch application, or oil pressure control system.
  • Perform control pressure test.
 
  • Damaged or worn governor. Sticking governor.
  • Perform governor check. Replace or service governor, clean screen.
 
  • Valve body loose.
  • Tighten to specification.
 
  • Dirty or sticking valve body.
  • Clean, service or replace valve body.
 
  • Cross leaks between valve body and case mating surface.
  • Service or replace valve body and/or case mating as required.
  • Shift points incorrect.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Vacuum line damaged, clogged or leaks.
  • Perform vacuum supply test.
 
  • Improper operation of EGR system.
  • Service or replace as required.
 
  • Improper speedometer gear installed.
  • Replace gear.
 
  • Improper clutch or band application, or oil pressure control system.
  • Perform shift test and control pressure test.
 
  • Damaged or worn governor.
  • Service or replace governor — clean screen.
 
  • Vacuum diaphragm bent, sticking or leaks.
  • Service or replace as required.
 
  • Dirty or sticking valve body.
  • Clean, service or replace valve body.
  • All upshifts harsh/delayed or no upshifts.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Manual shift cable misadjusted/damaged.
  • Check and adjust or service as required.
 
  • Governor sticking.
  • Perform governor test. Service as required.
 
  • Main control pressure too high.
  • Control pressure test. Service as required.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination. Service as required.
 
  • Vacuum leak to diaphragm unit.
  • Perform vacuum supply and diaphragm test. Check vacuum lines to diaphragm unit. Service as required.
 
  • Vacuum diaphragm bent, sticking, leaks.
  • Check diaphragm unit. Service as required.
  • Mushy/early all upshifts pile up/upshifts
  • Low main control pressure.
  • Control pressure test. Note results.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body or throttle control valve sticking.
  • Determine source of contamination. Service as required.
 
  • Governor valve sticking.
  • Perform governor test. Repair as required.
 
  • Kickdown linkage misadjusted, sticking or damaged.
  • Adjust linkage, service as required.
  • No 1-2 upshift.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Kickdown system damaged.
  • Replace damaged parts.
 
  • Manual shift cable misadjusted/damaged.
  • Check and adjust or service as required.
 
  • Governor valve sticking.
  • Perform governor test. Service as required.
 
  • Intermediate band out of adjustment.
  • Adjust intermediate band.
 
  • Vacuum leak to diaphragm unit.
  • Check vacuum lines to diaphragm. Service as required.
 
  • Vacuum diaphragm bent, sticking, leaks.
  • Check diaphragm unit. Service as necessary.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination. Service as required.
 
  • Intermediate band and/or servo assembly burnt.
  • Perform air pressure test.
  • Rough/harsh/delayed 1-2 upshift.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Poor engine performance.
  • Tune engine.
 
  • Kickdown linkage misadjusted.
  • Adjust linkage.
 
  • Intermediate band out of adjustment.
  • Adjust intermediate band.
 
  • Main control pressure too high.
  • Control pressure test. Note results.
 
  • Governor valve sticking.
  • Perform governor test. Service as required.
 
  • Damaged intermediate servo.
  • Air pressure check intermediate servo.
 
  • Engine vacuum leak.
  • Check engine vacuum lines. Check vacuum diaphragm unit. Perform vacuum supply and diaphragm test. Service as necessary.
 
  • Valve body bolts loose/too tight.
  • Tighten to specifications.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination. Service as required.
 
  • Vacuum leak to diaphragm unit.
  • Check vacuum lines to diaphragm unit. Service as required.
 
  • Vacuum diaphragm bent, sticking, leaks.
  • Check diaphragm unit. Service as necessary.
  • Mush/early/soft/slipping 1-2 upshift.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Main regulator or throttle valve stuck.
  • Service as required.
 
  • Incorrect engine performance.
  • Tune engine as required.
 
  • Intermediate band out of adjustment.
  • Adjust intermediate band.
 
  • Low main control pressure.
  • Control pressure test. Note results.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination. Service as required.
 
  • Governor valve sticking.
  • Perform governor test. Service as required.
 
  • Damaged intermediate servo or band.
  • Perform air pressure test. Service as required.
 
  • Polished, glazed intermediate band or drum.
  • Service or replace as required.
  • No 2-3 upshift.
  • Low fluid level.
  • Perform fluid level check.
 
  • Kickdown system damaged.
  • Replace damaged parts.
 
  • Low main control pressure to reverse-high clutch.
  • Control pressure test. Note results.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination, then service as required.
 
  • Reverse/high clutch assembly burnt/worn.
  • Determine cause of condition. Service as required.
ConditionPossible SourceAction
  • Harsh/delayed 2-3 upshift.
  • Incorrect engine performance.
  • Check engine tune-up.
 
  • Engine vacuum leak.
  • Check engine vacuum lines. Check vacuum diaphragm unit. Perform vacuum supply and diaphragm test. Service as necessary.
 
  • Kickdown system damaged.
  • Replace damaged parts.
 
  • Damaged or worn intermediate servo release and reverse-high clutch piston check ball.
  • Air pressure test the intermediate servo. Apply and release the reverse-high clutch piston check ball. Service as required.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of condition. Service as required.
 
  • Vacuum diaphragm bent, sticking, leaks.
  • Check diaphragm. Replace as necessary.
  • Soft/early/mushy 2-3 upshift.
  • Kickdown system damaged.
  • Replace damaged parts.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Determine source of contamination. Service as required.
 
  • Vacuum diaphragm or TV control rod bent, sticking, leaks.
  • Check diaphragm and rod. Replace as necessary.
 
  • Throttle valve stuck.
  • Service as required.
  • Erratic shifts.
  • Poor engine performance.
  • Check engine tune-up.
 
  • Vacuum line damaged.
  • Service as required.
 
  • Valve body bolts loose/too tight.
  • Tighten to specification.
 
  • Valve body dirty/sticking valves.
  • Air pressure test, note results. Determine source of contamination. Service as required.
 
  • Governor valve stuck.
  • Perform governor test. Service as required.
 
  • Output shaft collector body seal rings damaged.
  • Service as required.
  • Shifts 1-3 in (D) or D.
  • Intermediate band out of adjustment.
  • Adjust band.
 
  • Damaged intermediate servo and/or internal leaks.
  • Perform air pressure test. Service front servo and/or internal leaks.
 
  • Improper band or clutch application, or oil pressure control system.
  • Perform control pressure test.
 
  • Polished glazed band or drum.
  • Service or replace band or drum.
 
  • Dirty/sticky valve body, or governor.
  • Clean, service or replace valve body or governor.
 
  • Governor valve stuck.
  • Perform governor test. Service as required.
 
  • Kickdown system out of adjustment.
  • Adjust kickdown system.
  • Engine over-speeds on 2-3 shift.
  • Kickdown system damaged.
  • Replace damaged parts.
 
  • Improper band or clutch application, or oil pressure control system.
  • Perform control pressure test.
 
  • Damaged or worn reverse high clutch and/or intermediate servo piston.
  • Perform air pressure test. Service as required.
 
  • Intermediate servo piston seals cut, leaking.
  • Replace seals. Check for leaks.
 
  • Dirty or sticking valve body.
  • Clean, service or replace valve body.
 
  • Throttle valve stuck.
  • Service as required.
 
  • Damaged vacuum diaphragm.
  • Replace vacuum diaphragm.
  • Rough/shudder 3-2 shift at closed throttle in D.
  • Incorrect engine idle or performance.
  • Refer to the Powertrain Control/Emissions Diagnosis Manual.
 
  • Improper kickdown linkage adjustment.
  • Service or adjust kickdown linkage.
 
  • Improper clutch or band application or oil pressure control system.
  • Perform control pressure test.
 
  • Improper governor operation.
  • Perform governor test. Service as required.
 
  • Dirty or sticking valve body.
  • Clean, service or replace valve body.
  • No 3-4 upshift.
  • 3-4 shift solenoid is not being energized electrically. Wires shorted or an open circuit.
    Circuit continuity:
    3-4 solenoid wire pin 52 should read approx. 20 ohm resistance.
  • Perform EEC-IV diagnostic check — key on, engine off. Check circuit continuity with breakout box T83L-50-EEC-IV, and volt ohmmeter. Check power pin no. 57 (red lead) and 3-4 pin 52 (black lead).
 
  • Transmission case connector and harness connector not seated.
  • If not seated, check for contamination, clean and reconnect. Perform EEC-IV diagnostic check — key on, engine off.
 
  • Malfunction of: PCM Vacuum line disconnected from MAP sensor. MAP sensor. Throttle position sensor. Vehicle speed sensor.
  • Perform EEC-IV diagnostic check — key on, engine off.
 
  • Check O.D. band adjustment.
  • Reset band to 2.0 turns.
 
  • Overdrive servo damaged or leaking.
  • Check cover seal and piston assembly — replace if required.
 
  • Polished or glazed overdrive band or drum.
  • Service or replace.
 
  • Contaminated or sticking 3-4 shift valve.
  • Clean or replace valve body. Check 3-4 shift valve for freedom of movement.
 
  • Contaminated and sticking 3-4 solenoid.
  • Clean or replace 3-4 solenoid and filter sleeve assembly.
  • Slipping fourth gear.
  • Check overdrive band adjustment.
  • Reset band to 2.0 turns.
 
  • Overdrive servo damaged or leaking.
  • Check cover seal and piston assembly — replace if required.
 
  • Polished or glazed overdrive band or drum.
  • Service or replace.
  • Engine stall speed exceeded in (D), D or R.
  • Vacuum system.
  • Check and service vacuum system.
 
  • Low main control pressure.
  • Control pressure test. Check and clean valve body. Replace valve body gasket. Check or service pump.
  • Engine stall speed exceeded in R. OK in (D), D, 2 and 1.
  • Low/reverse servo/band damaged.
  • Check engine braking in 1. If not OK, check service or replace if required the low/reverse servo and band.
 
  • Reverse and high clutch damaged.
  • If low/reverse servo OK, check and service reverse and high clutch.
  • Engine stall speed exceeded in (D) or D. OK in R.
  • Overdrive one-way clutch or rear one-way clutch damaged.
  • Check engine stall speeds in 2 and 1.
    If OK, service overdrive or rear one-way clutches. Clean transmission.
ConditionPossible SourceAction
  • 1-2 upshift is above 64 km/h (40 mph) at moderate acceleration.
  • Vacuum system.
  • Check and service hoses and vacuum diaphragm if required.
 
  • Main control pressure.
  • Control pressure test.
 
  • Governor damaged or worn.
  • Perform governor check. Replace or service governor.
 
  • Dirty or sticking valve body.
  • Clean, service or replace valve body.
  • Kickdown shift speeds too early.
  • Kickdown system damaged.
  • Replace damaged parts.
 
  • Main control pressure.
  • Perform control pressure test.
 
  • Governor damaged or worn.
  • Perform governor check. Replace or service governor.
  • No kickdown into second gear between 64-100 km/h (40-60 mph) in (D) or D.
  • Kickdown system damaged.
  • Replace damaged parts.
 
  • Main control pressure.
  • Perform control pressure test.
 
  • Dirty or sticking valve body.
  • Check kickdown valve. Clean or replace valve body.
 
  • Kickdown cable over-adjusted.
  • Adjust kickdown cable.
  • No shift into second gear with accelerator pedal depressed at 40 km/h (25 mph) in (D) or D.
  • Main control pressure.
  • Control pressure test.
 
  • Governor damaged or worn.
  • Check governor.
 
  • Dirty or sticking valve body.
  • Clean or replace valve body.
  • When moving selector from (D) or D to manual 1, at 86 km/h (55 mph) with accelerator pedal released, no braking felt from downshift to second gear.
  • Main control pressure.
  • Perform control pressure test.
 
  • Intermediate band out of adjustment.
  • Adjust band. Check intermediate servo.
 
  • Overdrive clutch damaged.
  • Overdrive clutch damaged.
  • When moving selector from (D) or D to manual 1, at 86 km/h (55 mph) with accelerator pedal released, shift into first gear occurs over 72 km/h (45 mph).
  • Main control pressure.
  • Perform main control pressure test.
 
  • Dirty or sticking valve body.
  • Clean or replace valve body.
 
  • Governor damaged or worn.
  • Perform governor check. Replace or service governor.
 
  • Kickdown linkage misadjusted or stuck.
  • Adjust or repair kickdown linkage.
  • When moving selector from (D) or D to manual 1, at 86 km/h (55 mph) with accelerator pedal released, first gear shift occurs under 24 km/h (15 mph).
  • Main control pressure.
  • Perform control pressure test.
 
  • Dirty or sticking valve body.
  • Clean or replace valve body.
 
  • Low/reverse servo damaged.
  • Check and service as required.
 
  • Governor damaged or worn.
  • Perform governor check. Replace or service governor.
 
  • Overdrive clutch damaged.
  • Repair or replace as required.
  • No forced downshifts.
  • Kickdown cable damaged.
  • Replace damaged parts.
 
  • Kickdown cable over-adjusted.
  • Adjust kickdown cable.
 
  • Damaged internal kickdown linkage.
  • Service internal kickdown linkage.
 
  • Improper clutch or band application, or oil pressure control system.
  • Perform control pressure test.
 
  • Dirty or sticking governor.
  • Service or replace governor, clean screen.
 
  • Dirty or sticking valve body.
  • Clean, service, or replace valve body.
  • Engine over-speeds on 3-2 downshift.
  • Linkage out of adjustment.
  • Intermediate band out of adjustment.
  • Improper band or clutch applications and one-way clutch or oil pressure control system.
  • Damaged or worn intermediate servo.
  • Polished, glazed band or drum.
  • Dirty or sticking valve body.
  • Service or adjust linkage.
  • Adjust intermediate band.
  • Perform control pressure test. Service.
  • Air pressure test check the intermediate servo. Service servo and or seals.
  • Service or replace as required.
  • Clean, service or replace valve body.
  • Shift efforts high.
  • Manual shift cable damaged/misadjusted.
  • Check and adjust or service as required.
 
  • Inner manual lever nut loose.
  • Tighten nut to specification.
 
  • Manual lever retainer pin damaged.
  • Adjust linkage and install pin.
  • Transmission overheats.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Incorrect engine idle, or performance.
  • Refer to the Powertrain Control/Emissions Diagnosis Manual.
 
  • Improper clutch or band application, or oil pressure control system.
  • Perform control pressure test.
 
  • Restriction in cooler or lines.
  • Service restriction.
 
  • Seized converter one-way clutch.
  • Replace one-way clutch.
 
  • Dirty or sticking valve body.
  • Clean, service or replace valve body.
  • Transmission leaks.
  • Case breather vent.
  • Check the vent for free breathing. Repair as required.
 
  • Leakage at gasket, seals, etc.
  • Remove all traces of lube on exposed surfaces of transmission. Check the vent for free breathing. Operate transmission at normal temperatures and perform fluid leakage check. Service as required.
  • Poor vehicle acceleration.
  • Poor engine performance.
  • Check engine tune up. Refer to the Powertrain Control/Emissions Diagnosis Manual.
 
  • Torque converter one-way clutch slipping.
  • Replace torque converter.
  • Transmission noisy.

    NOTE: Gauges may aggravate any hydraulic resonance. Remove gauge and check for resonance level.
  • Improper fluid level.
  • Perform fluid level check.
 
  • Manual shift cable out of adjustment.
  • Service or adjust cable.
 
  • Improper band or clutch application, or oil pressure control system.
  • Perform control pressure test.
 
  • Cooler lines grounding.
  • Free up cooler lines.
 
  • Dirty or sticking valve body.
  • Clean, service or replace valve body.
 
  • Internal leakage or pump cavitation.
  • Service as required.
 
  • Gear noise.
  • Service planetary gear assemblies.
 
  • One-way clutch.
  • Service one-way clutch.
  • Engine stalls when shifting into forward or reverse.
  • Low engine idle.
  • Verify that engine idle speeds are set to specifications. Refer to the Powertrain Control/Emissions Diagnosis Manual .
 
  • Broken torque converter clutch shuttle valve spring.
  • Replace torque converter clutch shuttle valve spring.