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

DTC P0261: Injector 1 Control Circuit Low Voltage

DTC P0262: Injector 1 Control Circuit High Voltage

DTC P0264: Injector 2 Control Circuit Low Voltage

DTC P0265: Injector 2 Control Circuit High Voltage

DTC P0267: Injector 3 Control Circuit Low Voltage

DTC P0268: Injector 3 Control Circuit High Voltage

DTC P0270: Injector 4 Control Circuit Low Voltage

DTC P0271: Injector 4 Control Circuit High Voltage

DTC P0273: Injector 5 Control Circuit Low Voltage

DTC P0274: Injector 5 Control Circuit High Voltage

DTC P0276: Injector 6 Control Circuit Low Voltage

DTC P0277: Injector 6 Control Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition 1 Voltage	P0201, P0202, P0203, P0204, P0205, P0206	P0201, P0202, P0203, P0204, P0205, P0206	--	--
Injector 1 Control Circuit	P0261	P0201	P0262	--
Injector 2 Control Circuit	P0264	P0202	P0265	--
Injector 3 Control Circuit	P0267	P0203	P0268	--
Injector 4 Control Circuit	P0270	P0204	P0271	--
Injector 5 Control Circuit	P0273	P0205	P0274	--
Injector 6 Control Circuit	P0276	P0206	P0277	--

Circuit/System Description

The control module enables the appropriate fuel injector on the intake stroke for each cylinder. Ignition voltage is supplied directly to the fuel injectors. The control module controls each fuel injector by grounding the control circuit with a solid state device called a driver. The control module monitors the status of each driver. Each driver has a feedback voltage circuit which the engine control module (ECM) monitors. The injector control circuits are pulled-up to voltage within the ECM. The ECM can determine if a control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.

Conditions for Running the DTC

Conditions for Setting the DTC

P0201, P0202, P0203, P0204, P0205, or P0206

The ECM detects the injector control circuit is open for greater than 4 seconds or for a cumulative of 30 seconds.

P0261, P0264, P0267, P0270, P0273, or P0276

The ECM detects the injector control circuit is shorted to ground for greater than 4 seconds or for a cumulative of 30 seconds.

P0262, P0265, P0268, P0271, P0274, or P0277

The ECM detects the injector control circuit is shorted to voltage for greater than 4 seconds or for a cumulative of 30 seconds.

Action Taken When the DTC Sets

DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, and P0277 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, and P0277 are Type B DTCs.

Diagnostic Aids

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Observe the scan tool Misfire Current Counter parameters. The Misfire Current Counters should not be incrementing
2. Engine operating, observe the appropriate scan tool Fuel Injector Circuit Test Status parameters. Verify the Fuel Injector Circuit Test Status parameters display OK or Not Run.
3. Engine operating, observe the DTC information with a scan tool. DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, or P0277 should not set.
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the fuel injector multi-way harness connector X105.

Note: Testing for steps 2 through 4 is performed on the ECM side of the multi-way harness connector.

2. Ignition ON, connect a test lamp between the appropriate ignition voltage supply circuit terminal 1 or 2 and ground. Verify that the test lamp illuminates.

Note: The ignition voltage circuits supply voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition circuit.

⇒	If the test lamp does not illuminate, test the ignition circuits for a short to ground, or an open/high resistance. If the circuits test normal and the ignition circuit fuse is open, test or replace the appropriate fuel injector.

3. Test for 2.6-4.6 V between the appropriate fuel injector control circuit listed below and ground.

•	Injector 1 terminal 3

•	Injector 2 terminal 6

•	Injector 3 terminal 4

•	Injector 4 terminal 7

•	Injector 5 terminal 5

•	Injector 6 terminal 8

⇒	If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

⇒	If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Connect a test lamp between the appropriate fuel injector control circuit listed below and B+. Engine cranking, verify the test lamp flashes.

•	Injector 1 terminal 3

•	Injector 2 terminal 6

•	Injector 3 terminal 4

•	Injector 4 terminal 7

•	Injector 5 terminal 5

•	Injector 6 terminal 8

⇒	If the test lamp remains OFF, test the control circuit for a high resistance. If the circuit/connections test normal, replace the ECM.

Note: Testing for steps 5 and 6 is performed on the fuel injector side of the multi-way harness connector. It may be necessary to remove the intake manifold to isolate the condition.

5. Ignition OFF, measure the resistance between the appropriate fuel injector control circuit terminal listed below and ground. The DMM should display O.L.

•	Injector 1 terminal 3

•	Injector 2 terminal 6

•	Injector 3 terminal 4

•	Injector 4 terminal 7

•	Injector 5 terminal 5

•	Injector 6 terminal 8

⇒	If less than the specified value, test the fuel injector control circuit, or the appropriate ignition voltage circuit, for a short to ground. If the circuits/connections test normal, test or replace the appropriate fuel injector.

6. Test for 12-16 Ω between the appropriate ignition voltage circuit terminal 1 or 2 and each fuel injector control circuit listed below.

•	Injector 1 terminal 3

•	Injector 2 terminal 6

•	Injector 3 terminal 4

•	Injector 4 terminal 7

•	Injector 5 terminal 5

•	Injector 6 terminal 8

⇒	If less than the specified range, test for a short between the control circuit and the ignition voltage circuit. If the circuits/connections test normal, test or replace the appropriate fuel injector.

⇒	If greater than the specified range, test the ignition voltage, and fuel injector control circuit, for an open/high resistance. If the circuits/connections test normal, test or replace the appropriate fuel injector.

Component Testing

Refer to Fuel Injector Solenoid Coil Test.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.