P0203
DTC P0201-P0204 (LUW)
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
- Cylinder 1 Injector Control Circuit
DTC P0202
- Cylinder 2 Injector Control Circuit
DTC P0203
- Cylinder 3 Injector Control Circuit
DTC P0204
- Cylinder 4 Injector 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 powertrain relay voltage is between 11-32 V.
* The engine is running.
* 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 5 s.
Action Taken When the DTC Sets
DTCs P0201, P0202, P0203 and P0204 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0201, P0202, P0203 and P0204 are Type B DTCs.
Diagnostic Aids
* Performing the Fuel Injector Diagnosis may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis Fuel Injector Diagnosis.
* High resistance in the circuits of the injectors may set a misfire DTC without setting an injector DTC. Test the injector circuits of the affected cylinder(s) for a high resistance if you suspect a condition.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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 34730-2C - Injector Test
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Engine running, verify the scan tool control circuit status parameters listed below do not display Malfunction.
* Cylinder 1-4 Injector Control Circuit Open Test Status
* Cylinder 1-4 Injector Control Circuit Low Voltage Test Status
* Cylinder 1-4 Injector Control Circuit High Voltage Test Status
2. Observe the DTC information with a scan tool. DTCs P0201, P0202, P0203, or P0204 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 harness connector at the appropriate Q17 Fuel Injector.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 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 all components connected to the ignition voltage circuit and replace as necessary.
3. Ignition OFF, connect a J 34730-2C - injector test between the control circuit terminal 2 and the ignition circuit terminal 1 of the Q17 Fuel Injector.
4. Engine cranking or 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 K20 Engine Control Module.
• 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 K20 Engine Control Module.
5. If all circuits test normal, test or replace the Q17 Fuel Injector. Refer to Fuel Injector Replacement Service and Repair.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Fuel Injector Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, programming, and setup.