Pinpoint Tests

If DTCs appear while performing the On-Board Diagnostics, refer to the EEC-IV On-Board Diagnostic Trouble Code Description Chart for the appropriate service procedure. Prior to entering Pinpoint Tests, refer to any TSBs and Oasis messages for A4LD transmission concerns.

NOTE: Prior to entering Pinpoint Tests, check the PCM system wiring harness for proper connections, bent or broken pins, corrosion, loose wires, proper routing, proper seals and their condition. Check the PCM, sensors and actuators for damage. Refer to the Powertrain Control/Emissions Diagnosis Manual.

NOTE: After Electrical Diagnosis has been performed and a concern still exists, refer to the Mechanical Diagnosis.

ON-BOARD DIAGNOSTIC TROUBLE CODES 86/566 SS 3-4/4-3 SHIFT ERRORS — PINPOINT TEST A

A1 A4LD ELECTRONIC DIAGNOSTICS

• The following items must be checked before proceeding:
  Check the PCM for proper function (On-Board Diagnostics). Check the vehicle wiring harness for continuity and shorts to ground. Make sure all connectors are engaged properly. Make sure all terminals in the connectors are properly seated. Check all connectors for damage, corrosion, water, bent pins and missing or damaged seals.
  • Have the items above been checked?
  Yes
  GO to A2 .
  No
  PERFORM the checks.
   

  A2 CHECK HARNESS CONNECTIONS

  • Check that vehicle harness connector is fully engaged on transmission connector.
  • Check that vehicle harness connector terminals are fully engaged in connector.
  • Is the harness/terminals fully engaged?
  Yes
  GO to A3 .
  No
  SERVICE as required.
   

  A3 TRANSMISSION FUNCTIONAL TEST

   CAUTION: Do not attempt to pry connector. Depress the tab and pull up on the harness.

  • Disconnect vehicle harness at transmission.
  • Install tester to transmission connector (007-00085).
  • Using tests outlined in the tester manual:
  • Perform SOLENOID function test.

    NOTE: LED will turn GREEN when solenoid activates and turn OFF when deactivated. LED will turn RED if an activated solenoid/harness is shorted to B+. LED will remain OFF if an activated solenoid/harness is shorted to ground or no continuity (open circuit).

    Do the solenoids (LED) activate? (LED GREEN).
  • Perform the DIODE check. Is the diode OK (diode LED ON — GREEN)?
  Yes
  GO to A4 .
  No
  If diode is bad, REPLACE Transmission Case Connector. A bad diode may cause a PCM concern. Road test vehicle after connector replacement. If diode is OK, and no solenoid function, Go to A5 .
   

  A4 TRANSMISSION DRIVE TEST

  • Perform the Drive test as outlined in Transmission Tester manual.
  • Does the vehicle UPSHIFT when COMMANDED by the TESTER?
  Yes
  REFER to the Powertrain Control/Emissions Diagnosis Manual to diagnose PCM or harness concerns. ERASE all codes and perform the Drive Cycle as outlined in this manual. RERUN On-Board Diagnostics. If codes are still present, REFER to the Service Manual Condition/Cause charts for Transmission hardware diagnosis.
  No
  GO to A5 .
   

  A5 CHECK RESISTANCE OF SOLENOID/HARNESS

  NOTE: Refer to the Transmission Tester Overlay for terminal locations.

  • Bench/Drive switch in
    BENCH
    Mode.
  • Rotate Solenoid Select switch to "OHMS/DIODE CHECK" position.
  • Connect ohmmeter negative lead to SS 3-4/4-3 jack and positive lead to VPWR jack on tester. This is to test SS 3-4/4-3.
  • Record resistance.
  • Resistance should be between 26-40 ohms.
  • Is the shift solenoid resistance in specification?
  Yes
  GO to A6 .
  No
  NOTE: Out of specification may be caused by internal harness or solenoid concerns. GO to A7 .
   

  A6 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND

  • Check for continuity between B- (engine ground) and appropriate jack with an ohmmeter or other low current tester (less than 200 milliamps).
    
    

    Solenoid	Tester Jacks
    SS 3-4/4-3	SS 3-4/4-3 VPWR

    
    
  • Connection should show infinite resistance (no continuity).
  • Is there continuity?
  Yes
  GO to A7 .
  No
  REFER to Service Manual Condition/Cause charts for diagnosis.
   

  A7 A4LD INTERNAL ELECTRONIC DIAGNOSTICS

  • Drain transmission fluid.
  • Remove transmission pan.
  • Check that the internal harness connector is fully engaged on the shift solenoid assembly.
  • Check that the internal harness connector terminals are fully seated in the connector.
  • Inspect the connector for damage.
  • Were the checks done and everything OK?
  Yes
  GO to A8 .
  No
  SERVICE as required.
   

  A8 CHECK INTERNAL A4LD HARNESS (Continuity)

  • Disconnect the internal harness from the SS 3-4/4-3 solenoid assembly.
  • Connect the positive lead from an ohmmeter to the tester jack SS 3-4/4-3 and the negative lead at the BLUE wire of the SS 3-4/4-3 wire connector.
  • Record resistance. Resistance should be less than .5 ohms.
  • For VPWR, connect positive lead to VPWR and the negative lead to the BLUE/RED common wire of the SS 3-4/4-3 wire connector.
  • Record resistance. Should be less than .5 ohms.
  • Are the resistances less than .5 ohms?
  Yes
  GO to A9 .
  No
  REPLACE harness.
  NOTE: Do not probe into connector terminals.
   

  A9 CHECK INTERNAL A4LD HARNESS (Shorts to GND)

  • Check for continuity between B- (engine ground) and the appropriate wire with an ohmmeter or other low current tester (less than 200 milliamps).
    
    

    Solenoid	Wire
    SS 3-4/4-3	Blue Blue/Red Common

    
    
  • Connection should show infinite resistance (no continuity).
  • Is there continuity?
  Yes
  REPLACE harness.
  No
  GO to A10 .
   

  A10 CHECK SOLENOID RESISTANCE AT SOLENOID

  • Check solenoid resistance by connecting an ohmmeter at the terminals of the solenoid assembly.
  • Record the resistance.
  • Resistance should be between 26-40 ohms.
  • Is the resistance between 26-40 ohms?
  Yes
  GO to A11 .
  No
  REPLACE solenoid assembly.
   

  A11 CHECK SOLENOID FOR SHORT TO GROUND

  • Check for continuity between engine ground and each terminal of the solenoid with ohmmeter or other low current tester (less than 200 milliamps).
  • Connection should show infinite resistance (no continuity).
  • Is there continuity?
  Yes
  REPLACE solenoid assembly.
  No
  REFER to Service Manual for Condition/Cause charts for diagnosis.
   

  ON-BOARD DIAGNOSTIC TROUBLE CODES 89/626 TORQUE CONVERTER CLUTCH CIRCUIT FAILURE — PINPOINT TEST C

   

  C1 A4LD ELECTRONIC DIAGNOSTICS

  • The following items must be checked before proceeding: Check the Powertrain Control Module (PCM) for proper function (On-Board Diagnostics). Check the vehicle wiring harness for continuity and shorts to ground. Make sure all connectors are engaged properly. Make sure all terminals in the connectors are properly seated. Check all connectors for damage, corrosion, water, bent pins and missing or damaged seals.
  • Have the items above been checked?
  Yes
  GO to C2 .
  No
  PERFORM the checks.
   

  C2 CHECK HARNESS CONNECTIONS

  • Check that vehicle harness connector is fully engaged on transmission connector.
  • Check that vehicle harness connector terminals are fully engaged in connector.
  • Are the connectors/terminal fully engaged?
  Yes
  GO to C3 .
  No
  SERVICE as required.
   

  C3 TRANSMISSION FUNCTIONAL TEST

   CAUTION: Do not attempt to pry the connector. Depress the tab and pull up on the vehicle harness.

  • Disconnect vehicle harness at transmission.
  • Install tester to transmission connector (007-00085).
  • Using tests outlined in the tester manual:
  • Perform TCC solenoid function test.

    NOTE: LED will turn GREEN when solenoid activates and turn OFF when deactivated. LED will turn RED if an activated solenoid/harness is shorted to B+. LED will remain OFF if an activated solenoid/harness is shorted to ground or no continuity (open circuit).

    Does the TCC (LED GREEN) activate when the tester switch is depressed?
  • Perform the DIODE check. Is the Diode OK (diode LED ON — GREEN)?
  Yes
  GO to C4 .
  No
  GO to C5 .
  No
  If diode is bad, REPLACE Transmission Case Connector. A bad diode may cause a PCM concern. Road Test vehicle after case connector replacement. If diode is OK, and NO solenoid function, Go to C5 .
   

  C4 TRANSMISSION DRIVE TEST

  • Perform the Drive Test as outlined in Transmission Tester manual.
  • While in third gear depress the TCC switch.
  • Does the TCC (LED GREEN) activate?
  • Does the engine RPM drop?
  Yes
  REFER to the Powertrain Control/Emissions Diagnosis Manual to diagnose PCM and vehicle harness concerns.
  No
  GO to C5 .
   

  C5 CHECK RESISTANCE OF SOLENOID/HARNESS

  NOTE: Refer to the Transmission Tester overlay for Terminal Locations.

  • Set Bench/Drive switch to
    BENCH
    mode on tester.
  • Rotate gear select switch to OHMS/DIODE CHECK position.
  • Connect ohmmeter negative lead to TCC (CCO) jack and positive lead to VPWR on tester. This is to test TCC.
  • Record resistance.
  • Resistance should be between 26-40 ohms.
  • Is resistance between 26-40 ohms?
  Yes
  GO to C6 .
  No
  NOTE: Internal harness or solenoid may be damaged. GO to C7 .
   

  C6 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND

  • Check for continuity between B- (engine ground) and appropriate jack with an ohmmeter or other low current tester (less than 200 milliamps).
    
    

    Solenoid	Tester Jack
    TCC	CCO VPWR

    
    
  • Connection should show infinite resistance (no continuity).
  • Is there continuity?
  Yes
  GO to C7 .
  No
  NOTE: REFER to Service Manual to diagnose torque converter clutch concern.
   

  C7 A4LD INTERNAL ELECTRONIC DIAGNOSTICS

  • Drain transmission fluid.
  • Remove transmission pan.
  • Check that the internal harness connector is fully engaged on the shift solenoid assembly.
  • Check that the internal harness connector terminals are fully seated in the connector.
  • Inspect the connector for damage.
  • Is the above in good condition and engaged properly?
  Yes
  GO to C8 .
  No
  SERVICE as required.
   

  C8 CHECK INTERNAL A4LD HARNESS (Continuity)

  • Disconnect the internal harness from the TCC solenoid assembly (TCC wire connector).
  • For TCC, connect the positive lead from an ohmmeter to the tester TCC jack and the negative lead at the RED wire of the TCC connector.
  • Record resistance. Should be less than .5 ohms.
  • Next, connect the positive lead from an ohmmeter to the tester VPWR jack and the negative lead at the RED/BLUE Common wire of the TCC connector.
  • Record resistance. Should be less than .5 ohms.
  • Is the resistance less than .5 ohms?
  Yes
  GO to C9 .
  No
  REPLACE harness.

  NOTE: Do not probe into connector terminals.

   

  C9 CHECK INTERNAL A4LD HARNESS (Shorts to GND)

  • Check for continuity between B- (engine ground) and the appropriate wire with an ohmmeter or other low current tester (less than 200 milliamps).
    
    

    Solenoid	Wire
    TCC	RED RED/BLUE Common

    
    
  • Connection should show infinite resistance (no continuity).
  • Is there continuity?
  Yes
  REPLACE harness.
  No
  GO to C10 .
   

  C10 CHECK SOLENOID RESISTANCE

  • Check solenoid resistance by connecting an ohmmeter at the terminals of the solenoid assembly, this is for TCC.
  • Record the resistance.
  • Resistance should be between 26-40 ohms.
  • Is the resistance between 26-40 ohms?
  Yes
  GO to C11 .
  No
  REPLACE assembly.
   

  C11 CHECK SOLENOID FOR SHORT TO GROUND

  • Check for continuity between B- (engine ground) and each of the solenoid terminals with an ohmmeter or other low current tester (less than 200 milliamps).
  • Connection should show infinite resistance (no continuity).
  • Is there continuity?
  Yes
  REPLACE assembly.
  No
  REFER to Service Manual for diagnosis.

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