故障码索引 · medium
P1251
Throttle motor relay OFF failure
Throttle motor relay OFF failure
Scope: 2.5L/3.0L gasoline · System(s): EMS OBD II · Factory MIL flag: 2 · Default action: ECM Default: –Throttle motor and throttle motor relay disabled –Throttle valve opening set to default value –Idle speed controlled by fuel injection intervention –Idle speed adapti…
Common causes
- Throttle motor relay coil power supply circuit: open circuit (fuse) Throttle motor relay failure Throttle motor relay coil to ECM circuit: open circuit ECM ground circuit fault (relay coil drive)
Quick checks
- Confirm freeze-frame and conditions when the code set
- Inspect connectors, grounds, and harness for the circuit named in the code
- Swap coil/plug to another cylinder if misfire is cylinder-specific