2002 MY OBD-II System Operation Summary - MotorCraftService.com

Engine OutputsThe Idle Air Control (IAC) solenoid is checked electrically for open and shorts (P1504 or P0511) and is functionallychecked by monitoring the closed loop idle speed correction required to maintain the desired idle rpm. If the properidle rpm cannot be maintained and the system has a high rpm (+100) or low rpm error (-200) greater than themalfunction threshold, an IAC malfunction is indicated. (P1506 or P0507, P1507or P0506)IAC Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1504/P0511 (opens/shorts)P1506/P0507 (functional - overspeed)P1507/P0506 (functional - underspeed)once per driving cycleNone30 secondsTypical IAC functional check entry conditions:Entry Condition Minimum MaximumEngine Coolant Temp150 o FTime since engine start-up30 secondsClosed loop fuelYesThrottle Position (at idle, closed throttle, no dashpot) Closed ClosedTypical IAC functional check malfunction thresholds:For underspeed error: Actual rpm 100 rpm below target, closed-loop IAC correction > 1 lb/minFor overspeed error: Actual rpm 200 rpm above target, closed-loop IAC correction < .2 lb/minStarting in the 2002 MY, some vehicle application will perform a fuel injector continuity test. The PCM will monitorthe "smart" driver fault status bit that indicates either an open circuit, short to power or short to ground.Injector Check Operation:DTCsMonitor executionMonitor SequenceMonitoring DurationP0201 through P0210 (opens/shorts)Continuous within entry conditionsNone10 secondsTypical injector circuit check entry conditions:Entry Condition Minimum MaximumBattery VoltageEngine Coolant TempIntake Air Temp11.0 volts240 o F150 o FFORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 42 OF 66