P0203
DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) 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
DTC P0207
- Injector 7 Control Circuit
DTC P0208
- Injector 8 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.
Conditions for Running the DTC
* The engine is running.
* The ignition voltage is greater than 11 V.
* DTC P0201-P0208 runs continuously when the above conditions are met.
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 for greater than 2 s.
Action Taken When the DTC Sets
DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0207, and P0208 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0207, and P0208 are Type B DTCs.
Diagnostic Aids
Performing the Fuel Injector Diagnosis may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis (CH47976) (Testing and Inspection)Fuel Injector Diagnosis (J39021 or Scan Tool) (Testing and Inspection).
Reference Information
Schematic Reference
Engine Controls Schematics (except L96) ([1][2]Electrical Diagrams)Engine Controls Schematics (L96) ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Fuel System Description (Fuel System Description)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Control Module References) for scan tool information
Special Tools
J 34730-405 Injector Test Lamp
Circuit/System Verification
1. Engine idling, observe the following control circuit status parameters for each fuel injector:
* Cyl 1-8 Injector Ckt Short Gnd Test Status
* Cyl 1-8 Injector Ckt Open Test Status
* Cyl 1-8 Injector Ckt Short Volts Test Status
Each parameter should display OK or Not Run.
2. Engine running, observe the DTC information with a scan tool. DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207 or P0208 should not set.
3. 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
1. Ignition OFF, disconnect the affected fuel injector harness connector at the fuel injector.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal A and ground.
• If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test or replace the fuel injector.
3. Connect the J 34730-405 between the control circuit terminal B and the ignition voltage circuit terminal A.
4. Command the fuel injector ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• 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.
Component Testing
Note: The engine coolant temperature (ECT) sensor must be between 10-32°C (50-90°F) for an accurate measurement.
Measure for 11-14 ohm between the terminals of the fuel injector.
If not within the specified range, replace the fuel injector.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Fuel Injector Replacement (Removal and Replacement)
* Control Module References (Control Module References) for ECM replacement, setup, and programming