P0652

DTC P0652 or P0653

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0652
- 5 Volt Reference 2 Circuit Low Voltage

DTC P0653
- 5 Volt Reference 2 Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The engine control module (ECM) supplies 5 volts to components through 5-volt reference circuits. These 5-volt reference circuits are independent of each other outside the ECM, but are bussed together in three reference groups inside the ECM. Therefore, a circuit condition on one sensor 5-volt reference circuit may affect multiple components. The ECM monitors voltage on the 5-volt reference circuits.

Conditions for Running the DTC

* The ignition is ON.
* The diagnostics run continuously.

Conditions for Setting the DTC

DTC P0652
* The ECM detects the 5-volt reference 2 circuit voltage is less than 4.7 volts.
* The above condition is present for 2 seconds.

DTC P0653
* The ECM detects the 5-volt reference 2 circuit voltage is more than 5.2 volts.
* The above condition is present for 2 seconds.

Action Taken When the DTC Sets

DTC P0652 and P0653 are Type A DTCs.

Conditions for Clearing the MIL/DTC

DTC P0652 and P0653 are Type A DTCs.

Circuit/System Verification

* The engine starts and runs.
* Observe the 5-Volt Reference 2 Circuit Status parameter with a scan tool. The parameter should display OK.
* Engine running, observe the DTC information with a scan tool. DTCs P0652 or P0653 should not set.
* Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame Records data.

Circuit/System Testing

1. Turn OFF the ignition for 30 seconds or until the ECM powers down.
2. Disconnect the accelerator pedal position (APP) sensor.
3. Turn ON the ignition, with engine OFF and measure the voltage from the 5-volt reference circuit of the APP sensor 2 to a good ground with a DMM.

• If the voltage measures 4.7-5.2 volts, replace the APP sensor.

4. With the DMM still connected to the 5-volt reference circuit, disconnect all other components connected to the 5-volt reference 2, one at a time. Refer to Diagnostic Fault Information.

• If voltage changes when one of the above components are disconnected, replace the component. Refer to the appropriate replacement procedure.

5. Test the 5-volt reference 2 circuits for a short to ground or a short to voltage.

• If no problem was found in the 5-volt reference 2 circuit, replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Control Module References for ECM replacement, setup, and programming. Programming and Relearning
* Accelerator Pedal Position Sensor Replacement
* Engine Oil Level Sensor and/or Switch Replacement
* Fuel Sender Assembly Replacement Verification Tests