vauxhall Workshop Repair Guides

Vauxhall Workshop Service and Repair Manuals

DTC P160D - LPL or LPV > < DTC P0642 or P0643 - LPL or LPV

DTC P0652 or P0653 (LPL or LPV)

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: 5V Reference 2 Circuit Low Voltage
DTC P0653: 5V Reference 2 Circuit High Voltage

Circuit/System Description

The engine control module (ECM) has two 5 V reference circuits. The ECM provides the 5 V reference to various sensors. Each reference circuit provides a 5 V reference for greater than one sensor. A short to ground or voltage on one of the 5 V reference circuits will affect all components connected to that 5 V reference circuit. The ECM monitors the voltage on the 5 V reference circuits.

Conditions for Running the DTC

•  The ignition is ON.
•  The DTCs run continuously when the above condition is met.

Conditions for Setting the DTC

The control module detects a voltage above 5.5 V, or below 4.5 V, on any of the 5 V reference circuits for greater than 0.5 s.

Action Taken When the DTC Sets

•  DTC P0652 and DTC P0653 is a Type B DTC.
•  The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.

Conditions for Clearing the DTC

DTC P0652 and DTC P0653 is a Type B DTC.

Diagnostic Aids

If a shared 5 V reference circuit is shorted to ground or shorted to a voltage, other 5 V reference circuits may be affected.

DTC P0652 and DTC P0653

The 5 V reference 1 circuit provides 5 V to the accelerator pedal position (APP) sensor 2, boost pressure sensor, exhaust gas recirculation EGR position sensor, swirl system position sensor, rail pressure sensor, exhaust differential pressure sensor, AC pressure sensor, clutch pedal sensor, variable nozzle turbo sensor and to the camshaft position sensor.

Reference Information


Schematic Reference

Engine Controls Schematics


Connector End View Reference

Component Connector End Views


Electrical Information Reference


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. DTCs P0652 and P0653 should not set.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing


Note:  Additional DTCs will set when disconnecting the components.
1. Ignition OFF, disconnect the harness connector at all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.
2. Ignition ON, test for 4.6-5.4 V between the 5 V reference circuit and ground.
If the voltage is less than the specified range, test the 5 V reference circuit for a short to ground. If all circuits test normal, replace the K20 Engine Control Module.
If greater than the specified range, test the 5 V reference circuit for each component associated with the 5 V reference circuit for a short to voltage. If all circuits test normal, replace the K20 Engine Control Module.

Note:  A short to voltage on the signal circuit of certain components may cause this DTC to set.
3. Observe the scan tool that DTCs P0652 and P0653 is not set while connecting each component associated with the 5 V reference circuit one at a time.
If the DTC sets when a component is connected, test the signal circuit for a short to voltage. If all circuits test normal, replace the component.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•  Control Module References for ECM replacement, programming and setup

DTC P160D - LPL or LPV > < DTC P0642 or P0643 - LPL or LPV