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. |
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, P0204, or P0205 | -- | -- |
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 | -- |
Fuel Injector 5 Control | P0205 | P0205 | P0205 | -- |
¹Open fuse, Cranks no start ²Cranks no start | ||||
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.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Special Tools
J 35616-200 Test Light Probe Kit
Circuit/System Testing
- Ignition OFF, disconnect the X101 fuel injector multi-way connector.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A ECM harness side and ground.
- Ignition OFF, connect a J 35616-200 between the ignition circuit terminal A and the control circuit ECM harness side, of the appropriate injector listed below:
- Engine cranking, the test lamp should flash for each injector.
- Ignition OFF, measure for 10-15 ohms on the engine harness side of X101 between the ignition circuit terminal A and the control circuit of the appropriate injector listed below:
| ⇒ | 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. |
| • | Injector 1 terminal D |
| • | Injector 2 terminal E |
| • | Injector 3 terminal F |
| • | Injector 4 terminal B |
| • | Injector 5 terminal C |
| ⇒ | 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. |
| • | Injector 1 terminal D |
| • | Injector 2 terminal E |
| • | Injector 3 terminal F |
| • | Injector 4 terminal B |
| • | Injector 5 terminal C |
| ⇒ | 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 after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
