P1510

DTC P1510
Idle Air Control Valve fault (opening) Drive cycle A:Signal missing.

Possible causes by suggested order of priority:
^ Short circuit C641/3 (US) to vehicle +12V.
^ Short circuit C641/3 (US) to vehicle earth.
^ Open circuit C641/3 (US) to C636/42 (US).
^ Connector(s) C641,ECM C636 (B).
^ Voltage incorrect C641/2 (NK) to vehicle earth.
^ Faulty IACV (opening coil).
^ Faulty ECM.

Short Circuit C641/3 (US) To Vehicle +12V.
SHORT_CIRCUIT
^ Check resistance < 5.0 ohms

Short Circuit C641/3 (US) To Vehicle Earth.
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Open Circuit C641/3 (US) To C636/42 (US).
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Connector(s) C641,ECM C636 (B).
CONNECTOR
^ Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.

Voltage Incorrect C641/2 (NK) To Vehicle Earth.
CHECK THE FOLLOWING:
^ Voltage incorrect C641/2 (NK) to vehicle earth.
ACCEPTABLE RESULTS
^ Between 11.5 V and 15.0 V.
DIAGNOSTIC HINTS
^ If the voltage is not present check F2 Engine Compartment Fusebox and open circuit C641/2 (NK) to C570/1 (NK).

Faulty IACV (Opening Coil).
CHECK THE FOLLOWING:
^ Disconnect C641. Use a multimeter to check the resistance of the IACV opening coil (C641/2 (NK) to C641/3 (US)). Acceptable range 10 Ohms to 100 Ohms.
^ Check IACV by substituting a known good unit.
POSSIBLE FAULTS
^ IACV Faulty

Faulty ECM.
CHECK THE FOLLOWING:
^ Eliminate all other fault possibilities before suspecting the ECM.
^ Failure of this component is unlikely.
^ Check ECM by substituting a known good unit.
POSSIBLE FAULTS
^ ECM Faulty