P0203
DTC P0201, P0202, P0203, P0204, P0205, or P0206
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
DTC P0205
- Injector 5 Control Circuit
DTC P0206
- Injector 6 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 each bank of fuel injectors through a separate fuse. 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 more than 11 volts for 5 seconds.
* DTC P0201-P0206 runs 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 1 second.
Action Taken When the DTC Sets
DTCs P0201-P0206 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0201-P0206 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 (W/CH47976))Fuel Injector Diagnosis (w/Tech 2) (Fuel Injector Diagnosis (With J39021 or With 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
Circuit/System Verification
Key ON, observe the DTC information with a scan tool. DTC P0201, P0202, P0203, P0204, P0205, or P0206 should not be set.
Circuit/System Testing
1. Ignition OFF, disconnect the X101 fuel injector multi-way connector.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminals A and E engine control module (ECM) harness side and ground.
• If the test lamp does not illuminate, test the ignition circuits for a short to ground, or an open/high resistance. If the circuits test normal and the ignition circuit fuse is open, test or replace the fuel injector.
3. Ignition OFF, connect a test lamp between the ignition circuit terminal A and the control circuit ECM harness side, of the appropriate injector listed below:
* Injector 1 terminal B
* Injector 2 terminal F
* Injector 3 terminal C
* Injector 4 terminal G
* Injector 5 terminal D
* Injector 6 terminal H
4. Engine cranking, the test lamp should flash for each injector.
• If the test lamp is always ON, test the appropriate control circuit for a short to ground. If the circuit tests normal, replace the ECM.
• If the test lamp is always OFF, test the appropriate control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
5. Ignition OFF, measure for 10-15 ohms on the engine harness side of X101 between the ignition circuit terminal A or E and the control circuit of the appropriate injector listed below:
* Injector 1 terminal B
* Injector 2 terminal F
* Injector 3 terminal C
* Injector 4 terminal G
* Injector 5 terminal D
* Injector 6 terminal H
• If the resistance is not within the specified range, test for a short to ground or an open/high resistance between X101 and the appropriate fuel injector harness connector. If the circuits test normal, test or replace the affected fuel injector.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Fuel Injector and Fuel Rail Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming