• | 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. |
Fuel Injector Circuits | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Fuel Injector Positive Voltage Control Group 1 | P2146² | P2146 | P0201, P0204¹ | P0201, P0204, P2146 | -- |
Fuel Injector Positive Voltage Control Group 2 | P2149² | P2149 | P0206, P0207¹ | P0206, P0207, P2149 | -- |
Fuel Injector Positive Voltage Control Group 3 | P2152² | P2152 | P0202, P0205¹ | P0202, P0205, P2152 | -- |
Fuel Injector Positive Voltage Control Group 4 | P2155² | P2155 | P0203, P0208¹ | P0203, P0208, P2155 | -- |
Fuel Injector 1 Control | P0201, P0204, P2146 | P2146 | P0201 | P0201 | -- |
Fuel Injector 2 Control | P0202, P0205, P2152 | P2152 | P0202 | P0202 | -- |
Fuel Injector 3 Control | P0203, P0208, P2155 | P2155 | P0203 | P0203 | -- |
Fuel Injector 4 Control | P0201, P0204, P2146 | P2146 | P0204 | P0204 | -- |
Fuel Injector 5 Control | P0202, P0205, P2152 | P2152 | P0205 | P0205 | -- |
Fuel Injector 6 Control | P0206, P0207, P2149 | P2149 | P0206 | P0206 | -- |
Fuel Injector 7 Control | P0206, P0207, P2149 | P2149 | P0207 | P0207 | -- |
Fuel Injector 8 Control | P0203, P0208, P2155 | P2155 | P0208 | P0208 | -- |
¹ Misfire DTCs may also set. ² Injector DTCs may also set. |
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.
• | The ignition is ON. |
• | The charging system voltage is between 6-18 volts. |
• | 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. |
• | The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
• | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. |
• | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
• | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
• | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
• | Clear the MIL and the DTC with a scan tool. |
Engine Control Module Connector End Views
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.
⇒ | If the test lamp illuminates, test the fuel injector positive voltage circuit for a short to ground. |
⇒ | If all circuits test normal, replace the ECM. |
⇒ | 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. |
⇒ | If resistance is more than 0.2-0.3 ohm resistance, replace the fuel injector. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, programing and setup |