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: Injector 1 Control CircuitDTC P0202: Injector 2 Control Circuit
DTC P0203: Injector 3 Control Circuit
DTC P0204: Injector 4 Control Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 Voltage - Fuse to Splice | ¹ | ² | -- | -- |
Ignition 1 Voltage - Splice to Injector | ¹ | P0201, P0202, P0203, or P0204 | -- | -- |
Fuel Injector 1 Control | P0201 | P0201 | P0201 | -- |
Fuel Injector 2 Control | P0202 | P0202 | P0202 | -- |
Fuel Injector 3 Control | P0203 | P0203 | P0203 | -- |
Fuel Injector 4 Control | P0204 | P0204 | P0204 | -- |
¹Open fuse, cranks no start ²Cranks no start | ||||
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 5 seconds. |
| • | 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 .
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
J 44603 Injector Test Lamp
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate fuel injector.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 or A and ground.
- 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.
- Engine running, the test lamp should flash.
- If all circuits test normal, test or replace the fuel injector.
| ⇒ | 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. |
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for replacement, setup, and programming |
