P0202

DTC P0201, P0202, P0203, or P0204

Diagnostic Instructions

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



DTC Descriptors
DTC P0201
- Injector 1 Control Circuit

DTC P0202
- Injector 2 Control Circuit

DTC P0203
- Injector 3 Control Circuit

DTC P0204
- Injector 4 Control Circuit




Diagnostic Fault Information






Circuit/System Description

The control module enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The control module controls each fuel injector by grounding the control circuit via a solid state device called a driver. The control module monitors the status of each driver. If the control module detects an incorrect voltage for the commanded state of the driver, a fuel injector control circuit DTC sets.


Conditions for Running the DTC

* The engine is running.
* The ignition voltage is between 9-18 volts for more than 1 second.
* These DTCs run continuously when the above conditions are met.



Conditions for Setting the DTC

* The control module detects an incorrect voltage on the fuel injector control circuit.
* The above condition is met for more than 6 seconds.



Action Taken When the DTC Sets

DTCs P0201, P0202, P0203, P0204 are Type B DTCs.


Conditions for Clearing the DTC

DTCs P0201, P0202, P0203, P0204 are Type B DTCs.


Diagnostic Aids

Performing the Fuel Injector Diagnosis may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis (w/CH47976) (Fuel Injector Diagnosis (With CH 47976))Fuel Injector Diagnosis (w/J39021 or w/Tech 2) (Fuel Injector Diagnosis (w/J39021 or w/Tech 2))Fuel Injector Diagnosis (w/SA9182E or w/Tech 2) (Fuel Injector Diagnosis (w/SA9182E or w/Tech 2)) .


Reference Information
Schematic Reference

Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

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

J 44603 Injector Test Lamp


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate fuel injector.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 or A and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the fuel injector.

3. Ignition OFF, connect a J 44603 between the control circuit terminal 2 or B and the ignition circuit terminal 1 or A of the appropriate fuel injector.
4. Engine running, the test lamp should flash.

• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the engine control module (ECM).


• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

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



Repair Instructions

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

* Control Module References (Programming and Relearning)
* Fuel Injector Replacement (Service and Repair)