P1550
DTC P1550
CIRCUIT DESCRIPTION
The fuel injector control module (FICM) activates the fuel injector. The engine control module (ECM) signals the FICM to turn ON the injectors through the fuel injector control circuits. The FICM self monitors the supply voltage whenever the ignition is ON.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P1550 Fuel Injector Control Module System Voltage
CONDITIONS FOR RUNNING THE DTC
- Engine speed is greater than 60 RPM.
- Battery voltage is between 11-16 volts.
- DTC U0073 or U0105 are not set.
- DTC P1550 runs continuously.
CONDITIONS FOR SETTING THE DTC
The FICM detects low supply voltage for less than 1 second.
ACTION TAKEN WHEN THE DTC SETS
- The control module stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
- The driver information center, if equipped, may display a message.
CONDITIONS FOR CLEARING THE DTC
- 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 non-emission related diagnostic.
- Clear the DTC with a scan tool.
TEST
