Vauxhall Workshop Service and Repair Manuals

DTC P020A-P020D

Diagnostic Instructions

DTC Descriptors

Circuit/System Description

The engine control module (ECM) supplies voltage to each fuel injector on the injector positive voltage control circuits. The ECM energises each fuel injector by grounding the control circuit of that fuel injector. The ECM monitors the status of the injector positive voltage control circuits and the fuel injector control circuits. The injectors are separated into the following two groups:

When a fuel injector circuit condition is detected by the ECM, the affected fuel injector will be disabled and may disable the affected group of fuel injectors.

Conditions for Running the DTC

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match.

Action Taken When the DTC Sets

DTCs P020A, P020B, P020C and P020D are Type C DTCs.

Conditions for Clearing the DTC

DTCs P020A, P020B, P020C and P020D are Type C DTCs.

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 P0261, P0262, P0264, P0265, P0267, P0268, P0270 or P0271 should not set.

⇒	If any DTCs are set, refer to DTC P0261, P0262, P0264, P0265, P0267, P0268, P0270, or P0271 .

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 are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the affected fuel injector.
2. Ignition ON, test for 2-3 V between the low control circuit terminal 2 and ground.

⇒	If less than the specified range, test the low control circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

⇒	If greater than the specified range, test the low control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

3. Ignition ON, connect a test lamp between the affected fuel injector low control circuit terminal 1 and ground.
4. Engine cranking or running, the test lamp should illuminate or flash.

⇒	If the test lamp does not illuminate or flash, replace the K20 Engine Control Module.

5. If all circuits test normal, test or replace the affected fuel injector.

Component Testing

Static Test

1. Disconnect the harness connector at the affected fuel injector.

Note:  The DMM and test leads must be calibrated to 0 Ω in order to prevent misdiagnosis.

2. Test for 0.2-1.5 Ω between the low control terminal 2 and the high control terminal 1.

⇒	If not within the specified range, replace the fuel injector.

3. Test for infinite resistance between each terminal and ground.

⇒	If not the specified value, replace the fuel injector.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.