P1514

P1514
Idle Control Valve Opening Coil - Open Idle
Air Control (IAC) Valve Opening Coil - Interruption

P1513
Idle Control Valve Opening Coil - Open
Idle Air Control (IAC) Valve Opening Coil - Below Lower Threshold

P1510
Idle Control Valve Opening Coil - Open
Idle Air Control (IAC) Valve Opening Coil - Upper Threshold Exceeded

Function
The Idle Air Control (IAC) Valve has two coils. Both coils receive alternately current and create opposing forces at the pivoted armature which creates an opening cross section coinciding with the duty cycle of the received current.

Diagnostic conditions
A fault is recognized and stored in memory when the engine speed is higher than 80 1/min and the battery voltage is between 7.5 Volt and 17 Volt.

NOTE: If a fault occurs that would lead to very high engine speed, a late adjustment of the ignition angle sets in to act as an engine speed limiter.





Wiring Diagram.

Diagnostic procedure.




DTC P1514.




DTC P1513.




DTC P1510.

Check coil resistance of IAC Valve.
1. Remove connector for IAC Valve.
2. Connect ohmmeter to pin 2 and 3 at IAC Valve.

- Specified value: 10 - 12 ohms at 20°C.

Check wiring from ECM to IAC Valve for continuity.
1. Remove connector for IAC Valve.
2. Remove ECM connector.
3. Connect ohmmeter to ECM connector, pin 29 and to IAC Valve connector, pin 3.

- Specified value: 0 - 5 ohms
- If meter reads infinite resistance, check wiring for chafing and pinching damage.

Check wiring from ECM to IAC Valve for short circuit to ground.
1. Remove connector for IAC Valve
2. Remove ECM connector.
3. Connect ohmmeter to ECM connector, pin 29 and to ground.

- Specified value: infinite resistance
- If meter reads 0 - 5 ohms, check wiring for chafing and pinching damage.

Check wiring From ECM to IAC Valve for short to positive.
1. Remove connector for IAC Valve.
2. Remove ECM connector.
3. Connect voltmeter to ECM connector, pin 29 and to ground.

- Specified value: 0 Volt
- If meter reads battery voltage, check wiring for chafing and pinching damage.