P0652

DTC P0652 or P0653

Diagnostic Instructions

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

DTCs P0652 and P0653 are Type A DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0652 and P0653 are Type A DTCs.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

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

Important: Additional DTCs will set when disconnecting the components.


1. Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC.

Important: A short to voltage on the signal circuit of certain components may cause this DTC to set.


2. Ignition ON, measure for 4.8-5.2 volts between one of the 5-volt reference circuits and ground.

• If the voltage is less than the specified range, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the ECM.
• If the voltage is greater than the specified range, test for a short to voltage on all the 5-volt reference circuits. If all circuits test normal, replace the ECM.

3. Connect each component associated with the 5-volt reference circuit, one at a time, while monitoring the voltage. The voltage should not change more than 1 volt.

• If the voltage display increases greater than the specified value when a component is connected, test the signal circuit for a short to voltage. If all circuits test normal, replace the ECM.
• If the voltage display decreases more than the specified value when a component is connected, replace the component.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Accelerator Pedal Position Sensor Replacement (Service and Repair)
* Exhaust Pressure Differential Sensor Replacement (Exhaust Pressure Differential Sensor Replacement)
* Engine Oil Pressure Sensor and/or Switch Replacement (Service and Repair)
* Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement (Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming.