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 50 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 50 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 50 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

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Circuit/System Verification

1. Observe the Misfire Current Counters with a scan tool. The Misfire Current Counters should not be incrementing.
2. Engine operating, observe the DTC information with a scan tool. DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, and P0277 should not set.
3. If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing

Important: Disconnecting the multi-way harness connector causes P0201-P0206 fuel injector circuit open DTCs to set.

1. Ignition OFF, disconnect the fuel injector multi-way harness connector.
2. Ignition ON, connect a test lamp between the appropriate ignition voltage supply circuit on the ECM side of the multi-way connector and ground. Verify that the test lamp illuminates.

Important: The ignition circuit supplies 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 and the fuse is open, repair the appropriate ignition circuit for a short to ground between the corresponding fuel injectors and the fuse. Replace the fuse.

⇒	If the test lamp does not illuminate and the fuse is OK, repair the ignition voltage circuit for an open/high resistance between the multi-way connector and the fuse.

3. Connect a test lamp between the appropriate injector control circuit, ECM side of the multi-way harness connector, and B+. The test lamp should not illuminate

⇒	If the test lamp illuminates, test the control circuit for a short to ground. If circuit tests normal, replace the ECM.

4. Connect a test lamp between the appropriate injector control circuit, ECM side of the multi-way harness connector, and ground. The test lamp should not illuminate.

⇒	If the test lamp illuminates, test the control circuit for a short to voltage. If circuit tests normal, replace the ECM

5. Ignition ON, measure for 2.6-4.6 volts between the appropriate injector control circuit, ECM side of the multi-way connector, and ground.

⇒	If the voltage is not within the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

6. Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement .
7. Disconnect the fuel injector connectors.
8. Test for continuity between the ignition 1 voltage circuit(s) and the appropriate fuel injector control circuit, at the fuel injector side of the multi-way harness connector. The DMM should display OL.

⇒	If less than the specified value, repair the short between the ignition 1 voltage circuit and the control circuit.

9. Measure for less than 1 ohm of resistance in the appropriate ignition 1 voltage circuit, between the injector connector(s) and the multi-way connector.

⇒	If more than the specified value, repair the open/high resistance in the ignition 1 voltage circuit.

10. Measure for less than 1 ohm of resistance in the suspected control circuit, between the injector connector and the multi-way connector.

⇒	If more than the specified value, repair the open/high resistance in the fuel injector control circuit.

11. Test for continuity between appropriate fuel injector control circuit and ground. The DMM should display OL.

⇒	If less than the specified value, repair the short to ground in the fuel injector control circuit.

12. Test for continuity between the suspected fuel injector control circuit and all the other control circuits of the fuel injectors. The DMM should display OL.

⇒	If less than the specified value is measured between any of the control circuits, repair the wire to wire short between those circuits.

13. If all circuits test normal, test or replace the fuel injector(s).

Component Testing

Measure for 12-16 ohms of resistance between the terminals of the fuel injector.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.