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 CircuitDTC 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
| • | The engine speed is greater than 80 RPM. |
| • | The ignition 1 voltage is between 10-18 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 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
| • | 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 circuit status for the component with a scan tool. The circuit status parameter changes from OK or Indeterminate to Fault if there is a condition with the circuit or a connection. |
Reference Information
Schematic Reference
Connector End View Reference
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
- Engine idling, observe the scan tool Misfire Current Counters. The Misfire Current Counters should not be incrementing.
- Engine idling, observe the scan tool DTC information. DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, and P0277 should not set.
- 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 are captured in the Freeze Frame/Failure Records Data List.
Circuit/System Testing
- Ignition OFF, disconnect the fuel injector multi-way harness connector.
- Ignition ON, load test for B+ between the appropriate ignition voltage supply circuit and ground.
- Test for 2.6-4.6 volts between the appropriate fuel injector control circuit and ground
- Probe the appropriate fuel injector control circuit with a test lamp connected to B+. Engine cranking, verify the test lamp flashes.
- Ignition OFF, test for OL ohms between the appropriate ignition voltage circuit and ground.
- Test for 12-16 ohms between the appropriate ignition voltage circuit and each fuel injector control circuit.
Important: Testing for steps 2 through 4 is performed on the ECM side of the multi-way harness connector.
| ⇒ | If less than the specified range, repair the ignition voltage circuit for a short to ground, or an open/high resistance. Replace the fuse if necessary. |
| ⇒ | 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. |
| ⇒ | If the test lamp remains OFF, test the control circuit for a high resistance. If the circuit/connections test normal, replace the ECM. |
Important: 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 upper intake manifold to isolate the condition. Refer to Upper Intake Manifold Replacement .
| ⇒ | If less than the specified range, repair the ignition voltage, or control circuit, for a short to ground. |
| ⇒ | 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(s). |
| ⇒ | 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(s). |
Component Testing
- Ignition OFF, disconnect the fuel injector multi-way harness connector.
- Test for 12-16 ohms between the ignition voltage circuit and the appropriate fuel injector control circuit.
Important:
• The ECT sensor must be between 10-32°C (50-90°F) in order for an accurate measurement. • Testing is performed on the fuel injector side of the multi-way harness connector.
| ⇒ | If not within the specified range, replace the fuel injector. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module replacement, setup, and programming |
