For 1990-2009 cars

## DTC P0201-P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P2146, P2149, P2152, P2155, P216A, or P216D w/LLT

### 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.

### 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
DTC P2146: Injector Positive Voltage Control Circuit Group 1
DTC P2149: Injector Positive Voltage Control Circuit Group 2
DTC P2152: Injector Positive Voltage Control Circuit Group 3
DTC P2155: Injector Positive Voltage Control Circuit Group 4
DTC P216A: Injector Positive Voltage Control Circuit Group 5
DTC P216D: Injector Positive Voltage Control Circuit Group 6

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Fuel Injector 1 High Voltage Control | P2146 | P0201 | P2146 | --
Fuel Injector 1 Low Voltage Control | P0261 | P0201 | P0262 | --
Fuel Injector 2 High Voltage Control | P2149, P216A | P0202 | P2149, P216A | --
Fuel Injector 2 Low Voltage Control | P0264 | P0202 | P0265 | --
Fuel Injector 3 High Voltage Control | P2152, P216D | P0203 | P2152, P216D | --
Fuel Injector 3 Low Voltage Control | P0267 | P0203 | P0268 | --
Fuel Injector 4 High Voltage Control | P2155 | P0204 | P2155 | --
Fuel Injector 4 Low Voltage Control | P0270 | P0204 | P0271 | --
Fuel Injector 5 High Voltage Control | P2149, P216A | P0205 | P2149, P216A | --
Fuel Injector 5 Low Voltage Control | P0273 | P0205 | P0274 | --
Fuel Injector 6 High Voltage Control | P2152, P216D | P0206 | P2152, P216D | --
Fuel Injector 6 Low Voltage Control | P0276 | P0206 | P0277 | --

### Circuit/System Description

The engine control module (ECM) supplies voltage to each fuel injector on the injector high voltage control circuits. The ECM energizes each fuel injector by grounding the high voltage control circuit of that fuel injector. The ECM monitors the status of the injector high voltage control circuits and the fuel injector low voltage control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injectors will be disabled.

### Conditions for Running the DTC

• | The engine speed is greater than 80 RPM.

• | The ignition voltage is between 8-18 volts.

• | The injector has been commanded ON and OFF at least once.

• | The DTCs run continuously once the above conditions are met.

### Conditions for Setting the DTC

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

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

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

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

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

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

#### P2146, P2149, P2152, P2155, P216A, or P216D

The ECM detects the injector high voltage control circuit is shorted to ground or shorted to a voltage for greater than 4 seconds or for a cumulative time 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, P0277, P2146, P2149, P2152, P2155, P216A, and P216D 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, P0277, P2146, P2149, P2152, P2155, P216A, and P216D are Type B DTCs.

### Diagnostic Aids

• | The high voltage control circuits of injectors 2 and 5, and injectors 3 and 6, are paired together with a dual high side driver in the controller. A short to ground, or a short to voltage, on one of the paired circuits will set a DTC for the companion injector. The ECM will also disable the high side driver for the affected injectors.

• | The high voltage circuits of injectors 1 and 4 are not paired together in the controller.

• | Performing the fuel injector coil test may help isolate an intermittent condition. Refer to Fuel Injector Solenoid Coil Test.

• | If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool circuit test status parameter for the component. The circuit test status parameter will change from OK or Not Ran to Fault if there is a condition with the circuit or a connection.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Fuel System Description

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### 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 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. DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P2146, P2149, P2152, P2155, P216A, and P216D should not set.
3. 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 ON, clear the DTC information with a scan tool.
2. Ignition OFF, disconnect the appropriate multi-way harness connector X160 or X161, at the rear of the intake manifold.

Note: Testing for steps 3 through 5 is performed on the ECM side of the multi-way harness connector.

3. Connect a test lamp between ground and the high voltage control circuit terminal of the appropriate injector listed below.

• | Fuel Injector 1 terminal 8 X161

• | Fuel Injector 2 terminal 2 X160

• | Fuel Injector 3 terminal 9 X161

• | Fuel Injector 4 terminal 4 X160

• | Fuel Injector 5 terminal 10 X161

• | Fuel Injector 6 terminal 6 X160

4. Crank or start the engine while observing the test lamp, the test lamp should flash several times and then stop when the DTC sets.

Note: Four of the injector high voltage control circuits are paired in the controller with a dual driver, refer to Diagnostic Aids.

⇒ | If the test lamp is always ON, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.

⇒ | If the test lamp is always OFF, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

5. Clear the DTC information with a scan tool, then cycle the ignition OFF for 30 seconds.
6. Connect a test lamp between B+ and the low voltage control circuit terminal of the appropriate injector listed below.

• | Fuel Injector 1 terminal 2 X161

• | Fuel Injector 2 terminal 1 X160

• | Fuel Injector 3 terminal 3 X161

• | Fuel Injector 4 terminal 3 X160

• | Fuel Injector 5 terminal 4 X161

• | Fuel Injector 6 terminal 5 X160

7. Ignition ON, the test lamp should not illuminate

⇒ | If the test lamp is ON, test the circuit for a short to ground. If the circuit tests normal, replace the ECM.

8. Connect a test lamp between ground and the low voltage control circuit terminal of the appropriate injector listed below.

• | Fuel Injector 1 terminal 2 X161

• | Fuel Injector 2 terminal 1 X160

• | Fuel Injector 3 terminal 3 X161

• | Fuel Injector 4 terminal 3 X160

• | Fuel Injector 5 terminal 4 X161

• | Fuel Injector 6 terminal 5 X160

9. Ignition ON, the test lamp should not illuminate

⇒ | If the test lamp is ON, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.

10. Clear the DTC information with a scan tool, then cycle the ignition OFF for 30 seconds.
11. Ignition OFF, connect a test lamp between the high voltage control circuit terminal and the low voltage control circuit terminal of the appropriate injector listed below.

• | Fuel Injector 1 terminal 8 and terminal 2 X161

• | Fuel Injector 2 terminal 2 and terminal 1 X160

• | Fuel Injector 3 terminal 9 and terminal 3 X161

• | Fuel Injector 4 terminal 4 and terminal 3 X160

• | Fuel Injector 5 terminal 10 and terminal 4 X161

• | Fuel Injector 6 terminal 6 and terminal 5 X160

12. Crank or start the engine while observing the test lamp, the test lamp should flash several times and then stop when the DTC sets.

⇒ | If the test lamp does not flash, test the circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

Note: Testing for the following steps 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.

13. Ignition OFF, measure the resistance between the appropriate ignition high voltage control circuit and ground. The DMM should display O.L.

⇒ | If not the specified value, test the high voltage, or low control circuit, for a short to ground. If the circuits/connections test normal, test or replace the appropriate fuel injector.

14. Test for 1.5-2.5 Ω between the appropriate high voltage control and low voltage control circuit.

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

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

### Component Testing

1. Ignition OFF, disconnect the harness connector at the fuel injector.
2. Test for 1.5 Ω ±0.15 Ω at 20°C (68°F) between the low voltage control circuit terminal 1 and the high voltage control terminal 2 of the fuel injector.

⇒ | If not within the specified range, replace the fuel injector.

3. Test for infinite resistance between each terminal and the fuel injector housing/case.

⇒ | If less than the specified value, replace the fuel injector.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Fuel Injector Replacement

• | Control Module References for engine control module replacement, setup, and programming