DTC P1510, P1512, P1514 & P1516: Idle Air Control (IAC) Solenoid Valve Signal No. 1-4 Circuits Low Input - Except 2.2L & Legacy 2.5L M/T

Turn ignition off. Disconnect IAC solenoid valve connector. Turn ignition on. Using voltmeter connected to ground, check voltage at IAC solenoid valve connector terminal No. 2. See Figure. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in wiring or poor contact in connectors between main relay and IAC solenoid valve. See appropriate wiring diagram in WIRING DIAGRAMS article.
Check voltage between ground and IAC solenoid valve connector terminal No. 5. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in wiring or poor contact in connectors between main relay and IAC solenoid valve connector.

Turn ignition off. Using an ohmmeter, check resistance between specified ECM and IAC connector terminals. See Figure and Figure . See IAC SOLENOID VALVE RESISTANCE - EXCEPT 2.2L & LEGACY 2.5L M/T table. If resistance is less than one ohm on all circuits, go to next step. If resistance is one or more ohm on any circuit, repair open in wiring or poor contact in connectors between ECM and IAC solenoid valve.

IAC SOLENOID VALVE RESISTANCE - EXCEPT 2.2L & LEGACY 2.5L M/T

IAC Solenoid Valve No.	ECM Connector B134 (35-Pin Connector) Terminal No.	IAC Solenoid Valve Connector Terminal No.
1	5	3
2	6	1
3	19	6
4	20	4

Ensure ignition is off. Disconnect ECM B134 (35-pin connector). Measure resistance between ECM connector B134 (35-pin connector) terminals No. 5, 6, 19 and 20 and chassis ground. If resistance is less than 10 ohms on any circuit, repair short in wiring between ECM and IAC solenoid valve. If resistance is 10 ohms or more on all circuits, go to next step.
Check for poor contact at ECM and IAC solenoid valve connectors. Repair connections as necessary. If connections are okay, replace IAC solenoid valve.