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 P1224: Fuel Injector 1 Control Circuit ShortedDTC P1227: Fuel Injector 2 Control Circuit Shorted
DTC P122A: Fuel Injector 3 Control Circuit Shorted
DTC P1233: Fuel Injector 4 Control Circuit Shorted
DTC P1236: Fuel Injector 5 Control Circuit Shorted
DTC P1239: Fuel Injector 6 Control Circuit Shorted
DTC P1242: Fuel Injector 7 Control Circuit Shorted
DTC P1247: Fuel Injector 8 Control Circuit Shorted
Diagnostic Fault Information
Fuel Injector Circuits | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Fuel Injector Positive Voltage Control Group 1 | P2146 | P2146 | P0201, P0204¹ | P1233, P1224, P2146 | -- |
Fuel Injector Positive Voltage Control Group 2 | P2149 | P2149 | P0206, P0207¹ | P1239, P1242, P2149 | -- |
Fuel Injector Positive Voltage Control Group 3 | P2152 | P2152 | P0202, P0205¹ | P1227, P1236, P2152 | -- |
Fuel Injector Positive Voltage Control Group 4 | P2155 | P2155 | P0203, P0208¹ | P122A, P1247, P2155 | -- |
Fuel Injector 1 Control | P1233, P2146 | P2146 | P0201 | P1224, P2146 | -- |
Fuel Injector 2 Control | P1236, P2152 | P2152 | P0202 | P1227, P2152 | -- |
Fuel Injector 3 Control | P1247, P2155 | P2155 | P0203 | P122A, P2155 | -- |
Fuel Injector 4 Control | P1224, P2146 | P2146 | P0204 | P1233, P2146 | -- |
Fuel Injector 5 Control | P1227, P2152 | P2152 | P0205 | P1236, P2152 | -- |
Fuel Injector 6 Control | P1242, P2149 | P2149 | P0206 | P1239, P2149 | -- |
Fuel Injector 7 Control | P1239, P2149 | P2149 | P0207 | P1242, P2149 | -- |
Fuel Injector 8 Control | P122A, P2155 | P2155 | P0208 | P1247, P2155 | -- |
¹ Misfire DTCs may also set. | |||||
Circuit/System Description
The engine control module (ECM) supplies voltage to each fuel injector on the injector positive voltage control circuits. The ECM energizes each fuel injector by grounding the control circuit of that fuel injector. The ECM monitors the status of the injector positive voltage control circuits and the fuel injector control circuits. The injectors are separated into the following four groups:
| • | Group 1--DTC P2146 with injectors 1 and 4 |
| • | Group 2--DTC P2149 with injectors 6 and 7 |
| • | Group 3--DTC P2152 with injectors 2 and 5 |
| • | Group 4--DTC P2155 with injectors 3 and 8 |
When a fuel injector circuit condition is detected by the ECM, the affected fuel injectors will be disabled and may disable the affected group of fuel injectors.
Conditions for Running the DTC
| • | The engine is running. |
| • | The charging system voltage is between 10-18 volts. |
Conditions for Setting the DTC
| • | The ECM injector output driver detects an incorrect current on a fuel injector circuit. |
| • | The condition exists for 1 second. |
Action Taken When the DTC Sets
DTCs P1224, P1227, P122A, P1233, P1236, P1239, P1242 and P1247 are Type A DTCs.
Conditions for Clearing the MIL/DTC
DTCs P1224, P1227, P122A, P1233, P1236, P1239, P1242 and P1247 are Type A DTCs.
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 Testing
Important: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Observe the DTC information with a scan tool. If DTC P2146, P2149, P2152 or P2155 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
One Fuel Injector DTC Sets
- Disconnect the affected fuel injector connector.
- Turn ON the ignition with the engine OFF.
- Connect a test lamp between the affected fuel injector control circuit and a ground. The test lamp should not illuminate.
- Connect a test lamp between the affected fuel injector control circuit and battery voltage. The test lamp should not illuminate.
- Test the affected group injector positive voltage control circuit for a short to ground or a short to voltage.
- Test the affected fuel injector for high resistance. Refer to Component Testing in this diagnostic.
- If the circuits tested normal, replace the ECM.
| ⇒ | If the test lamp illuminates, test the fuel injector control circuit for a short to voltage. |
| ⇒ | If the test lamp illuminated, test the fuel injector control circuit for a short to ground. |
Component Testing
- Disconnect the connector of the fuel injector to be tested.
- Connect a DMM between the terminals of the fuel injector and measure the resistance. The resistance should be 0.2-0.3 ohms.
| ⇒ | If the resistance is more than 0.2-0.3 ohms resistance, replace the fuel injector. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, programing, and setup |
