P0653

P0653-SENSOR REFERENCE VOLTAGE 2 CIRCUIT HIGH





For a complete wiring diagram refer to Diagrams/Electrical.


- When Monitored:

Ignition on.

- Set Condition:

When the PCM recognizes the Auxiliary 5-volt Supply circuit voltage is too high. One Trip Fault. ETC light is flashing.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.


Diagnostic Test


1. ACTIVE DTC


NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test.

Start the engine and allow it to idle for at least 60 seconds.


WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

With a scan tool, select View DTCs.

Is the DTC Active at this time?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition


2. (K857) AUXILIARY 5-VOLT SUPPLY SHORTED TO VOLTAGE





Turn the ignition off.

Disconnect the C1 PCM harness connector.

Disconnect all the Sensors that share the (K857) Auxiliary 5-volt Supply circuit.


NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for wiring added by customer.

Ignition on, engine not running.

Measure the voltage on the (K857) Auxiliary 5-volt Supply circuit at the CMP Sensor harness connector.

Is there any voltage present?

Yes

- Repair the short to voltage in the (K857) Auxiliary 5-volt Supply circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 3


3. PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test