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DTC P0201, P0202, P0203, P0204, P1224, P1227, P122A, or P1233

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 P0201 04: Cylinder 1 Injector Control Circuit Open

DTC P0202 04: Cylinder 2 Injector Control Circuit Open

DTC P0203 04: Cylinder 3 Injector Control Circuit Open

DTC P0204 04: Cylinder 4 Injector Control Circuit Open

DTC P1224 00: Cylinder 1 Injector Control Circuit Malfunction

DTC P1224 01: Cylinder 1 Injector Control Circuit Short to Battery

DTC P1227 00: Cylinder 2 Injector Control Circuit Malfunction

DTC P1227 01: Cylinder 2 Injector Control Circuit Short to Battery

DTC P122A 00: Cylinder 3 Injector Control Circuit Malfunction

DTC P122A 01: Cylinder 3 Injector Control Circuit Short to Battery

DTC P1233 00: Cylinder 4 Injector Control Circuit Malfunction

DTC P1233 01: Cylinder 4 Injector Control Circuit Short to Battery

Diagnostic Fault Information

Circuit

Short to Ground

High Resistance

Open

Short to Voltage

Signal Performance

Fuel Injector Positive Voltage Control Group 1

P2146

P2146

P0201, P0204

P2146

-

Fuel Injector Positive Voltage Control Group 2

P2149

P2149

P0202, P0203

P2149

-

Fuel Injector 1 Control

P0201

P2146

P0201

P0201

-

Fuel Injector 2 Control

P0202

P2149

P0202

P0202

-

Fuel Injector 3 Control

P0203

P2149

P0203

P0203

-

Fuel Injector 4 Control

P0204

P2146

P0204

P0204

-

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:

    • Group 1 - DTC P2146 for injectors 1 and 4
    • Group 2 - DTC P2149 for injectors 2 and 3

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

Conditions for Running the DTC
    • The engine is running.
    • The ECM monitors for a condition once per camshaft revolution.

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 P0201, P0202, P0203, P0204, P1224, P1227, P122A, and P1233 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0201, P0202, P0203, P0204, P1224, P1227, P122A, and P1233 are Type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics : LLW

Connector End View Reference

Component Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

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 P2146 or P2149 should not set.
    2. ⇒If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  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 appropriate fuel injector.
  2. Ignition ON, test for 2.8-7.8 V between the low control circuit terminal 1 and ground.
    3. ⇒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.
    5. ⇒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 appropriate fuel injector.

Component Testing
  1. Disconnect the harness connector at the appropriate fuel injector.

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

  2. Test for 0.2-0.4 Ω between the low control terminal 1 and the high control terminal 2.
    3. ⇒If not within the specified range, replace the appropriate fuel injector.
  3. Test for infinite resistance between each terminal and ground.
    4. ⇒If not the specified value, replace the appropriate fuel injector.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Fuel Injector Replacement
    • Control Module References for ECM replacement, programming and setup
   


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