Diagnostic Instructions

DTC Descriptors

DTC P0201: Injector 1 Control Circuit

DTC P0202: Injector 2 Control Circuit

DTC P0203: Injector 3 Control Circuit

DTC P0204: Injector 4 Control Circuit

DTC P0205: Injector 5 Control Circuit

DTC P0206: Injector 6 Control Circuit

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition 1 Voltage	¹	²	--	--
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	--
Fuel Injector 6 Control	P0206	P0206	P0206	--
¹Open fuse, Cranks no start ²Open before splice, Cranks 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

Conditions for Setting the DTC

Action Taken When the DTC Sets

DTC P0201-P0206 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTC P0201-P0206 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

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Special Tools Required

J 35616-200 Test Light Probe Kit

Circuit/System Verification

Key ON, observe the DTC information with a scan tool. DTC P0201, P0202, P0203, P0204, P0205, or P0206 should not be set.

Circuit/System Testing

1. Ignition OFF, disconnect the C105 fuel injector multi-way connector.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A ECM 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 between the ignition circuit terminal A and the control circuit ECM harness side, of the appropriate injector listed below:

•	Injector 1 terminal C

•	Injector 2 terminal D

•	Injector 3 terminal E

•	Injector 4 terminal F

•	Injector 5 terminal G

•	Injector 6 terminal H

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 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.

5. Ignition OFF, connect a test lamp between the appropriate control circuit terminal and the B+ terminal.

⇒	If the test lamp is always ON, test the appropriate control circuit for a short to ground.

6. Ignition OFF, measure for 10-15 ohms on the engine harness side of C105 between the ignition circuit terminal A and the control circuit of the appropriate injector listed below:

•	Injector 1 terminal C

•	Injector 2 terminal D

•	Injector 3 terminal E

•	Injector 4 terminal F

•	Injector 5 terminal G

•	Injector 6 terminal H

⇒	If the resistance is not within the specified range, test for an open/high resistance between C105 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.