For 1990-2009 cars

### 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 | -- | --
Injector 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.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

• | Engine Controls Connector End Views

• | Inline Harness Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

• | Scan Tool Data Definitions

• | Scan Tool Data List

• | Scan Tool Output Controls

#### Special Tools

J 35616-200 Test Light Probe Kit

### Circuit/System Verification

Key ON, observe the DTC information with a scan tool. DTC P0201, P0202, P0203, or P0204 should not be set.

### Circuit/System Testing

1. Ignition OFF, disconnect the C101 fuel injector multi-way connector.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A powertrain control module (PCM) harness side 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 or replace the fuel injector.

3. Ignition OFF, connect a J 35616-200 Probe Kit between the ignition circuit terminal A and the control circuit PCM harness side, of the appropriate injector listed below:

• | Injector 1 terminal B

• | Injector 2 terminal C

• | Injector 3 terminal D

• | Injector 4 terminal E

4. Engine cranking, the test lamp should flash for each injector.

⇒ | If the test lamp is always ON, test the appropriate control circuit for a short to ground. If the circuit tests normal, replace the PCM.

⇒ | 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 PCM.

5. Ignition OFF, measure for 10-15 ohms on the engine harness side of C101 between the ignition circuit terminal A and the control circuit of the appropriate injector listed below:

• | Injector 1 terminal B

• | Injector 2 terminal C

• | Injector 3 terminal D

• | Injector 4 terminal E

⇒ | If the resistance is not within the specified range, test for a short to ground or an open/high resistance between C101 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 PCM replacement, setup, and programming

• | Fuel Injector Replacement