25 Idle Speed - (P 1294)

25 IDLE SPEED - (P 1294)

ENABLING CONDITIONS
- No Idle Air Control (IAC) motor circuit Diagnostic Trouble Code (DTC)
- Powertrain Control Module (PCM) not in limp-in mode from Manifold Absolute Pressure (MAP)
- PCM not in limp-in from mode Throttle Position Sensor (TPS)
- Engine RPM must be greater than the start-to-run transfer RPM
- PCM not in spark advance default
- Engine RPM must be at idle
- Stop lamp switch must be indicating that the brakes are applied
- Vehicle Speed Sensor (VSS) must be indicating that the vehicle is not moving
- MAP sensor must be indicating that the manifold pressure is greater than 4 in. of vacuum

CONFLICT
The test does not run if any of the following conditions are present:

- The Minimum Air Flow test is running
- A/C is on at barometric pressures below 27.56 in. of mercury
- Power steering switch indicates there is a power steering load on the engine when the barometric pressure is less than 27.56 in. of mercury

The MIL is illuminated and a DTC is stored when the idle RPM differs from target idle by 200 RPM for 12 seconds.

The Idle Speed malfunction could possibly be caused by problems with any of the following components:

- IAC motor
- Throttle body (plugged passage)
- Intake manifold (cracked)
- Brake booster diaphragm (vacuum leak) PCV valve, etc. (vacuum leak)