P0561

P0561-SYSTEM VOLTAGE UNSTABLE





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

Theory of Operation

The Transmission Control Module (TCM) performs basic system checks to ensure proper controller operation. This Diagnostic Trouble Code (DTC) monitors system voltage to the TCM for proper level.

- When Monitored:
Ignition on, with no battery/system voltage DTCs present, no engine rpm errors, and not in limp-in mode.

Engine speed is greater than 400 rpm.

- Set Condition:
Battery voltage is below 10.5 volts, but greater than 9 volts.





Always perform the AW60T Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

1. CHECK SYSTEM VOLTAGE
1. Using the scan tool, monitor system voltage.

Is the system voltage between 9 and 10.5 volts?

Yes

- Go To 2

No

- Go To 5

2. CHECK FOR OTHER DTCS
1. Using the scan tool, check for charging system DTCs.

Are there any charging system DTCs?

Yes

- Testing and Inspection.

No

- Go To 3

3. CHECK THE TCM B(+) FEED CIRCUIT




1. Disconnect the TCM harness connector.
2. Ignition on, engine not running.
3. Using a 12-volt test light connected to ground, check the B(+) feed circuit at the appropriate terminal of the TCM 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 for the B(+) feed circuit?

Yes

- Go To 4

No

- Repair the B(+) feed circuit for an open or high resistance.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

4. CHECK THE TCM GROUND CIRCUIT




1. Using a 12-volt test light connected to 12-volts, check the TCM ground circuit at the appropriate terminal of the TCM 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 for the TCM ground circuit?

Yes

- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Information Tune-ups or Service Bulletins for possible causes that may apply. If no problems are found, replace and program the Transmission Control Module Assembly (TCM). AW60T TCM Programming Procedure.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

No

- Repair the TCM ground circuit for an open or high resistance.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

5. CHECK THE 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 wiring and connectors while checking for shorted and open circuits.
4. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the AW60T VERIFICATION TEST. AW60T Transmission Verification Test.

No

- Test Complete.