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P0702






P0702-TRANSMISSION CONTROL SYSTEM ELECTRICAL

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Transmission Control Output is used to supply the primary power to the Transmission Control Module (TCM). When the ignition switch is in the unlock, run or crank position, the ignition switch provides and input to the Totally Integrated Power Module (TIPM). The TIPM then energizes the Transmission Control relay which provides voltage to the TCM.

- When Monitored:
Continuously with the Ignition on and the engine running.

- Set Condition:
The TCM detects low voltage on the Transmission Control Output while the engine speed is greater than 0 rpm for 15 seconds.





Always perform the AS68RC Pre-Diagnostic Troubleshooting procedure before proceeding. AS68RC Pre-Diagnostic Troubleshooting Procedure

1. CHECK IF DTC IS CURRENT
1. Using the scan tool, read TCM DTCs.
2. Record the Environmental Data and any DTCs.
3. Clear DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. Read TCM DTCs.

Did the DTC reset?

Yes

- Go To 2

No

- Go To 8

2. CHECK FOR RELATED TIPM DTCs
1. With the scan tool, view TIPM DTCs.

Are there any TIPM power output codes stored?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 3

3. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT




1. Turn the ignition off to the lock position.
2. Disconnect the TCM C2 harness connector.
3. Ignition on, engine not running.
4. Using the scan tool, actuate the Transmission Control Output in the TIPM.
5. Using a 12-volt test light connected to ground, check both of the (T16) Transmission Control Output circuits on the appropriate terminal of TCM C2 harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly on both of the TCM (T16) Transmission Control Output circuits?

Yes

- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems are found, replace and program the TCM.
- Perform AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

No

- Go To 4

4. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT




1. Turn the ignition off to the lock position.
2. Install a substitute Transmission Control relay.
3. Ignition on, engine not running.
4. Using the scan tool, actuate the Transmission Control Output in the TIPM.
5. Using a 12-volt test light connected to ground, check both of the (T16) Transmission Control Output circuits on the appropriate terminal of TCM C2 harness connector.

Does the test light illuminate brightly on both of the TCM (T16) Transmission Control Output circuits?

Yes

- Replace the Transmission Control Relay.
- Perform AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

No

- Go To 5

5. CHECK THE (A916) BATTERY FEED CIRCUIT
1. Turn the ignition off to the lock position.
2. Remove Transmission Control relay.
3. Ignition on, engine not running.
4. Using a 12-volt test light connected to ground, check the (A916) Battery Feed circuit at the Transmission Control relay harness connector.

Does the test light illuminate brightly on the (A916) Battery Feed circuit?

Yes

- Go To 6

No

- Check the (A916) Battery Feed circuit for and open or short to ground. If no problems are found, replace the TIPM.
- Perform AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

6. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN




1. Turn the ignition off to the lock position.
2. Measure the resistance of the (T16) Transmission Control Output circuit between the TCM C2 harness connector and the Transmission Control relay harness connector.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (T16) Transmission Control Output circuit for an open.
- Perform AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

No

- Go To 7

7. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance between ground and the (T16) Transmission Control Output circuit.

Is the resistance below 100k Ohms?

Yes

- Repair the (T16) Transmission Control Output circuit for a short to ground.
- Perform AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

No

- Using the schematics as a guide, check the Totally Integrated Power Module (TIPM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems are found, replace and program the TIPM.

8. CHECK WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
4. Check for any Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

No

- Test Complete.

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