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 P2146: Injector Positive Voltage Control Circuit Group 1DTC 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
Diagnostic Fault Information
Fuel Injector Circuits | Short to Ground | High Resistance | Open | Short to Voltage |
|---|---|---|---|---|
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 fuel injectors in the affected group will be disabled and set the group DTC and may also set the fuel injectors DTCs.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The charging system voltage is between 6-18 volts. |
Conditions for Setting the DTC
| • | The ECM injector output driver detects an incorrect current on a fuel injector circuit. |
| • | The above condition is present for 3 seconds for groups 1, 2, and 3. |
| • | The above condition is present for 5 seconds for group 4. |
Action Taken When the DTC Sets
DTCs P2146, P2149, P2152 and P2155 are Type A DTCs.
Conditions for Clearing the MIL/DTC
DTCs P2146, P2149, P2152 and P2155 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.
- Turn OFF the ignition.
- Disconnect the ECM connector.
- Connect a test lamp between the fuel injector positive voltage control circuit and battery voltage. The test lamp should not illuminate.
- Connect a test lamp between the affected fuel injector positive voltage 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 fuel injector positive voltage control circuit and the fuel injector control circuit for high resistance.
- Test the affected fuel injector for high resistance. Refer to Component Testing in this diagnostic.
| ⇒ | If the test lamp illuminates, test the fuel injector positive voltage control circuit and both injector control circuits for a short to ground. |
| ⇒ | If the test lamp illuminates, test the fuel injector positive voltage control circuit for a short to voltage. |
| ⇒ | If the test lamp illuminates, test both fuel injector control circuits of the affected group for a short to ground. |
| ⇒ | If all circuits test normal, replace the ECM. |
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 resistance is more than 0.2-0.3 ohms, 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 |
