Service Information

Captiva

Fuel Injector Circuit Diagnosis

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, or P0204	-	-
Fuel Injector 1 Control	P0201, P0300	P0201, P0300	P0201	-
Fuel Injector 2 Control	P0202, P0300	P0202, P0300	P0202	-
Fuel Injector 3 Control	P0203, P0300	P0203, P0300	P0203	-
Fuel Injector 4 Control	P0204, P0300	P0204, P0300	P0204	-
¹Open fuse, cranks no start ²Cranks no start

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

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 44603 Injector Test Lamp

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification

Engine idling, observe the following control circuit status parameters for each fuel injector:

•	Cylinder 1-4 Injector Control Circuit Low Voltage Test Status

•	Cylinder 1-4 Injector Control Circuit Open Test Status

•	Cylinder 1-4 Injector Control Circuit High Voltage Test Status

⇒	Each parameter should toggle between OK and Not Run or Not Run and OK.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at a fuel injector.
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 or replace the fuel injector.

Ignition OFF, connect a J 44603 Injector Test Lamp between the control circuit terminal 2 and the ignition circuit terminal 1 of each fuel injector one at a time.
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 engine control module (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.

If all circuits test normal, test or replace the fuel injector.

Component Testing

•	Fuel Injector Solenoid Coil Test

•	Fuel Injector Balance Test

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Fuel Injector Replacement

•	Control Module References for replacement, setup, and programming