Rotunda Transmission Tester

Use Rotunda Transmission Tester 007-00085 or equivalent to diagnose electronically controlled transmissions. The following instructions outline the set-up and use of this tester in the pinpoint tests for the AODE.

NOTE: Use the AODE transmission tester overlay to diagnose the AODE transmission.

Tester Jacks

1. VPWR Pin Jacks (red): VPWR test points for solenoid circuits.

2. Solenoid (MCCC, EPC) Signal Line Pin Jacks (black): Signal line test points for solenoid circuits.

   NOTE: The tester overlay is labeled for the MCCC solenoid. This is used to test the torque converter clutch (TCC) solenoid.

3. BAT+ (red) and BAT- (black) Pin Jacks: Battery reference points when measuring circuits for shorts.

4. TOT Pin Jacks: Test points for transmission oil temperature sensor (TOT sensor) (7H141).

5. OSS Pin Jacks: Test points for output speed shaft sensor (OSS).

Tester LEDs and Controls

1. Overlay and Cable Correctly Installed LEDs: Only LEDs with symbol and cable correctly match.

2. Status LEDs: LED "OFF" when not activated by tester (solenoid not activated, open circuit or signal line short to ground). LED "GREEN" when activated by tester and current draw is correct. LED "RED" when activated by tester and current draw is excessive (short to Battery Positive Voltage (B+)). All LEDs light orange during Self-Test.

3. Solenoid Activate Buttons: Energize respective solenoids during click testing and activate selected circuits during DRIVE mode testing.

4. Bench/Drive Switch: Selects operating mode, either BENCH or DRIVE.

5. Solenoid Select/Gear Select Switch: Has three functions.
   1. In BENCH MODE: acts as shift solenoid selector for click testing.
   2. In DRIVE MODE: acts as forward gear selector in place of vehicle's PCM controlled shifting. Hydraulic safety mechanisms and overrides are built into the transmission.
   3. In OHMS CHECK: allows you to measure resistance (ohms).

Transmission Tester Instructions

The Rotunda Transmission Tester 007-00085 allows a technician to operate the electrical portion of the transmission independent of the vehicle electronics. This allows the technician to determine transmission concerns.

Transmission Tester Use

The Transmission Tester usage is divided in five steps:

1. Preliminary Testing and Diagnosis
2. Installing the Transmission Tester
3. Static Testing— Engine OFF
4. Dynamic Testing— Engine Running
5. Removing Transmission Tester and Clearing Diagnostic Trouble Codes

Preliminary Testing and Diagnosis

Before any diagnostic testing is done on vehicle some preliminary checks must be performed, as outlined below. Be sure to write down findings, especially any DTCs found, for future reference.

1. Check transmission fluid level and condition.
2. Check for add-on items (phones, computers, CB radio, etc.).
3. Visually inspect wiring harness and connectors.
4. Check for vehicle modifications.
5. Check shift linkage for proper adjustment.
6. Verify customer concern:
   • Upshift, Downshift, Coasting, Engagement, Noise/Vibration
7. Vehicle must be at normal operating temperature.
8. Perform vehicle on-board diagnostic.
9. Record all DTCs.
10. Service all non-transmission codes.

Transmission Tester Installation (Set-Up Procedures)

Installing the transmission tester at the transmission connector allows separation of the vehicle electronics from transmission electronics. Disconnecting normal vehicle electronics will set additional DTCs and cause firm shifts. (Disconnecting the transmission connector defaults transmission to maximum line pressure).

NOTE: During tester usage additional DTCs may be set. Therefore, it is important that all DTCs are erased after service has been made. To verify elimination of all DTCs rerun On-Board Diagnostic.

NOTE: The following manuals should be available to assist in diagnosis of electronically controlled transmissions:

• Powertrain Control/Emissions Diagnosis Manual
• Transmission Tester Manual (provided with tester).

 CAUTION: Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in transmission concerns.

1. Disconnect vehicle wiring harness at transmission connector.

2. Turn tester solenoid select switch to the OHMS CHECK position.

    CAUTION: Route all cables away from heat sources.

3. Connect appropriate tester interface cable and overlay to transmission and tester.

    CAUTION: Route gauge line away from heat sources.

4. Install a line pressure gauge into line pressure tap on transmission.

5. Plug transmission tester power supply into cigar lighter receptacle. At this time, all LEDs should illuminate for a short period and then turn off. This is the tester internal circuit check.

6. Position Bench/Drive switch to BENCH mode.

Static Testing—Engine Off

Static testing procedures allow for shop testing of the transmission in the vehicle or on the bench. Completion of these tests prove out transmission electronics.

 CAUTION: For resistance checks, be sure the tester solenoid select switch is set to the OHMS CHECK position or damage to the ohmmeter may result.

Resistance/Continuity Tests

• Refer to the appropriate Pinpoint Test to be performed based on the DTCs displayed.
• Using a Digital Volt-Ohmmeter and the Transmission Tester perform the Pinpoint Tests as indicated based on the DTCs which were displayed.
• Service as indicated by the pinpoint tests. Always retest and road test vehicle after service.

Transmission Solenoids and Sensors Resistance Tests

EPC Solenoid

• Set ohmmeter to 100-200 ohm range.
• Connect negative lead of ohmmeter to the EPC jack.
• Connect positive lead of ohmmeter to the VPWR jack.
• Record resistance.
• Refer to the following charts for values.

If out of specification, refer to Pinpoint Test E in this Section.

Solenoids (SS-1, SS-2, TCC)

• Set ohmmeter to 100-200 ohm range.
• Connect positive lead of ohmmeter to the appropriate VPWR jack for the solenoid being tested.
• Connect negative lead of the ohmmeter to the appropriate solenoid (SS-1, SS-2, MCCC) jack and record resistance.

Refer to following charts for values.

If out of specification, refer to Pinpoint Test A (SS-1, SS-2); Pinpoint Test C (TCC).

TRANSMISSION APPLICATION

Solenoid	Ohms
SS-1	20-30
SS-2	20-30
TCC	1.0-3.0
EPC	2.48-5.66

Transmission Oil Temperature (TOT) Sensor

• Set ohmmeter to 1000 ohm scale.
• Connect ohmmeter positive lead to +TOT jack.
• Connect ohmmeter negative lead to -TOT jack.
• Record resistance. Resistance will vary with temperature.
• Refer to the following chart.

If out of specification, refer to Pinpoint Test B in this Section.

Temperature		Resistance
°C	°F	Ohms (K)
0-20	32-68	100K-37K
21-40	69-104	37K-16K
41-70	105-158	16K-5K
71-90	159-194	5K-2.7K
91-110	195-230	2.7K-1.5K
110-130	230-266	1.5K-0.8K

Output Shaft Speed Sensor (OSS)

• Set ohmmeter to 1000 ohm (K) range.
• Connect the positive lead of the ohmmeter to the +OSS.
• Connect the negative lead of the ohmmeter to the -OSS.
• Record resistance.
• OSS should be 450-750 ohms.

If out of specification, refer to Pinpoint Test F in this Section.

Short to Ground and Solenoid Voltage Tests

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.

1. Set tester Bench/Drive switch to BENCH mode.

2. Set voltmeter to 20 volt DC range.

3. Connect voltmeter positive lead to the appropriate solenoid. Connect voltmeter negative lead to the appropriate solenoid.

4. Using a VOM, check for voltage across each solenoid by activating the solenoid switches. Press the appropriate switch. The LED should illuminate, the voltage should change and an audible click may be heard. If LED does not illuminate, a short to ground condition exists.

   NOTE: TCC solenoid click may or may not be audible.

5. Observe and record values.

Dynamic Testing—Engine Running

Dynamic testing is the final step in the transmission tester usage. It allows the transmission to be proven out electronically and hydraulically.

Transmission Solenoid Cycling and Drive Test Procedures

Preliminary Set Up

1. Set Bench/Drive switch to DRIVE mode.

2. Set gear select switch to first gear position.

3. Place vehicle in PARK.

4. Start engine.

EPC Solenoid

 CAUTION: Do not attempt to hold the EPC switch depressed (minimum line pres2sure) and stall the transmission (holding the vehicle with the brake while depressing the throttle with the transmission in gear), as transmission damage will result.

1. Observe line pressure. Record value.
   Line pressure should go to maximum. If not, refer to the Diagnosis by Symptom Routines for diagnostic tips or Pinpoint Test E concerning EPC solenoid.

2. Press EPC switch. Line pressure should drop to a minimum value. Record value. If not, refer to the Diagnosis by Symptom Routines or Pinpoint Test E for the EPC solenoid.

Engagements

1. Verify that Bench/Drive switch is in DRIVE mode and Gear Select switch is in 1st gear position.

2. Press EPC switch. Line pressure should drop to idle pressure. While holding EPC switch down, shift vehicle from PARK to REVERSE.
   • Does vehicle shift into REVERSE?
   • Shift vehicle from PARK to DRIVE.
   • Does vehicle shift into DRIVE?

   Release the EPC switch. Pressure should return to maximum. Repeat engagements. With the EPC switch released, engagements should be firm .

Upshift/Downshift

NOTE: Upshifts and downshifts will be firm during this procedure.

NOTE: Pressure gauges may be removed.

NOTE: These tests should be performed on the road. If performed on the hoist, the technician may not feel all shifts when engaged.

LEDs will turn GREEN when solenoids are activated and turn OFF when deactivated. Refer to the appropriate overlay for the proper status shift sequence of the shift solenoids (7G484) during upshifts and downshifts.

1. Shift vehicle into OVERDRIVE and accelerate to 24 km/h (15 mph), select second gear by rotating gear select switch to second gear position.
   • Did vehicle upshift to second gear?
   • Did appropriate shift solenoids activate/deactivate?

2. Accelerate to 40 km/h (25 mph) and select third gear position.
   • Did vehicle upshift to third gear?
   • Did appropriate shift solenoids activate/deactivate?

3. Accelerate to 56-72 km/h (35/45 mph) and select fourth gear position.
   • Did vehicle upshift to fourth gear?
   • Did appropriate shift solenoids activate/deactivate?

4. Reverse the order to downshift.
   • Does vehicle downshift from fourth to third, third to second, and second to first?
   • Did appropriate shift solenoids activate/deactivate?

Torque Converter Engagement

NOTE: This test should be performed on the road. If performed on a hoist, feeling the torque converter clutch engage may not be possible.

 CAUTION: Do not depress MCCC switch with transmission in gear and the vehicle at a stop. Damage to the torque converter clutch may result.

1. Accelerate and shift vehicle up into third gear. Hold speed steady and press the MCCC switch.
   • Does the torque converter engage?
   • Does the engine rpm drop?
   • Did torque converter clutch solenoid (TCC solenoid) (7G136) activate?

Output Shaft Speed Sensor (OSS) Function Check

NOTE: This test may be performed on the hoist or on the road.

1. Set voltmeter to 20 volts AC.
   • Connect voltmeter positive lead to the (+) OSS jack.
   • Connect voltmeter negative lead to the (-) OSS jack.
   • Slowly accelerate vehicle and monitor voltmeter.
   • Does voltage increase with vehicle speed?

Transmission Tester Removal and Clearing DTCs

 CAUTION: Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in a transmission concern.

1. Disconnect transmission tester from transmission connector.

2. Re-install vehicle wiring harnesses. Verify connection by pulling up on the harness.

3. Re-install all heat shields that were previously removed.

4. Disconnect transmission tester power lead from vehicle.

5. Erase all diagnostic trouble codes using the procedures in the Powertrain Control/Emissions Diagnosis Manual (unlatch center button of tester while DTCs are being displayed during KOEO).

6. Rerun On-Board Diagnostics to receive a pass code (111— 5.0L, P1111—3.8L).

7. Verify customer concern has been eliminated.