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 | * | ** | -- | -- |
Injector 1 Control Circuit | P0201 | P0201 | P0201 | -- |
Injector 2 Control Circuit | P0202 | P0202 | P0202 | -- |
Injector 3 Control Circuit | P0203 | P0203 | P0203 | -- |
Injector 4 Control Circuit | P0204 | P0204 | P0204 | -- |
* Engine cranks but does not run and the fuse for the injector circuit opens. ** Engine cranks but does not run. | ||||
Circuit/System Description
The engine control module (ECM) enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The ECM controls each fuel injector by grounding the control circuit via a solid state device called a driver. The ECM monitors the status of each driver.
Conditions for Running the DTC
| • | The engine speed is greater than 700 RPM. |
| • | The ignition 1 voltage is greater than 10 Volts. |
| • | The DTCs run continuously once the above conditions are met. |
Conditions for Setting the DTC
The ECM detects the injector control circuit is open, shorted to voltage, or shorted to ground for greater than 5 seconds.
Action Taken When the DTC Sets
DTCs P0201, P0202, P0203, P0204 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0201, P0202, P0203, P0204 are Type A DTCs
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
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 34730-405 Injector Test Lamp
Circuit/System Verification
Important: If you were sent here from Engine Cranks but Does Not Run, proceed to Circuit/System Testing.
Engine running, observe the DTC information with a scan tool. DTCs P0201, P0202, P0203, or P0204 should not set.
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 1 voltage circuit terminal A or 2 and ground.
- Ignition OFF, connect a J 34730-405 between the control circuit terminal B or 1 and the ignition 1 voltage circuit terminal A or 2.
- 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, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance. Replace the fuse if necessary. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuits test normal, replace the 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. |
Component Testing
- Ignition OFF, disconnect the harness connector at the appropriate fuel injector.
- Test for 11-14 ohms of resistance between the ignition 1 voltage terminal A or 2 and the control terminal B or 1.
Important: The engine coolant temperature (ECT) sensor must be between 10-32°C (50-90°F) in order for an accurate measurement.
| ⇒ | If not within the specified range, replace the fuel injector. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module replacement, setup, and programming |
