P1245

Wiring Diagram:

Intake Manifold Runner Control (IMRC) Solenoid Control Circuit:

P1245-INTAKE MANIFOLD RUNNER CONTROL (IMRC) SOLENOID CONTROL CIRCUIT
The intake manifold runner is a long moveable divider inside the intake manifold, which changes induction airflow characteristics as it pivots above a certain engine speed/load range. The ECM controls the intake manifold runner by controlling the manifold runner control (IMRC) solenoid. The IMRC solenoid is supplied continuous ported vacuum, which is transferred to the intake manifold runner diaphragms whenever the solenoid is energized. The ECM controls the solenoid by supplying the circuit ground. When the solenoid is commanded Off (circuit not grounded), the voltage level at the ECM should be high (ignition voltage). When the solenoid is commanded On (circuit grounded), the voltage level at the ECM should be low. DTC P1245 will set if the ECM detects lower than normal feedback voltage when the IMRC solenoid is commanded Off; or higher than normal feedback voltage when the IMRC solenoid is commanded On.

DTC PARAMETERS
DTC P1245 will set if the IMRC solenoid feedback voltage is less than 6.6 volts when IMRC solenoid is commanded Off; OR if IMRC solenoid feedback voltage is greater than 4.6 volts when the IMRC solenoid is commanded On when:
^ Condition exists for longer than 0.5 seconds
^ Engine speed is greater than 40 rpm
^ Battery voltage is between 7.5 and 15 volts

DTC P1245 diagnostic runs continuously once the above conditions have been met.

P1245 is a type D DTC

DIAGNOSTIC AIDS
To locate an intermittent problem, use Scan tool to monitor DTC P1245 LAST TEST with engine running at idle. Wiggling wires while watching for a change from PASSED to FAILED may locate the area where an open or short to ground in the wiring may exist. These failures are only valid if the IMRC solenoid is currently being commanded Off.

Use Scan tool to command INTAKE MANIFOLD RUNNER CONTROL SOLENOID On and Off with ignition On, engine Off. The solenoid should click when commanded On and Off.