P2149

DTC P2149

CIRCUIT DESCRIPTION
The fuel injection control module (FICM) supplies high voltage to each fuel injector on the ignition voltage circuits. The FICM energizes each fuel injector by grounding the command circuit between the FICM and the fuel injector. The FICM monitors the status of the ignition voltage circuits and the fuel injector command circuits. When a fuel injector circuit condition is detected by the FICM, all of the fuel injectors on the affected ignition voltage circuit will be disabled. If a circuit condition is detected on a fuel injector circuit for cylinders 1, 4, 6, or 7, DTCs P0201, P0204, P0206, P0207 will set, along with DTC P2146. If a circuit condition is detected on a fuel injector circuit for cylinders 2, 3, 5, or 8, DTCs P0202, P0203, P0205, P0208 will set, along with DTC P2149.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P2149 Injector Positive Voltage Relay Control Circuit Group 2

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- DTC U0073 or U0105 are not set.

CONDITIONS FOR SETTING THE DTC
The engine control module (ECM) detects a circuit fault related to the high voltage circuit to cylinders 2, 3, 5, and 8.

ACTION TAKEN WHEN THE DTC SETS
- 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.

CONDITIONS FOR CLEARING THE MIL/DTC
- 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.

TEST DESCRIPTION

Steps 1-5:

The number below refers to the step number on the diagnostic table.
2. This step determines if a wiring or injector condition caused this DTC to set. If DTC P2149 sets alone, an internal FICM fault is the cause.