Idle Air Control Motor

Perform appropriate Idle Air Control (IAC) motor circuit test. See the following:

• On 4.7L, see DTC P0508: IAC VALVE SIGNAL CIRCUIT LOW or DTC P0509: IAC VALVE SIGNAL CIRCUIT HIGH under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - DURANGO - 4.7L article.
• On 5.9L, see DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - DURANGO - 5.9L article.