For a complete wiring diagram Refer to Section 8WThe Accelerator Pedal Position Sensor contains two independent three wire inductive sensors. Each sensor provides independent pedal position signals to the ECM. The raw voltage signal from APP 1 sensor is 2 times the raw voltage signal from APP 2. Although the raw voltage signals differ, the scan tool converts and displays these voltages as matching percentages of pedal travel.When Monitored:With the ignition on. No other APP DTC's set. No Sensor Reference Voltage DTC's set.Set Condition:APP Sensor 1 and APP Sensor 2 signals do not agree for 0.4 second.Possible CausesINTERMITTENT DTC(F855) ACCELERATOR PEDAL POSITION SENSOR NO. 1 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE(K23) ACCELERATOR PEDAL POSITION SENSOR NO. 1 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE(K167) ACCELERATOR PEDAL POSITION SENSOR NO. 1 SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE(F856) ACCELERATOR PEDAL POSITION SENSOR NO. 2 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE(K12) ACCELERATOR PEDAL POSITION SENSOR NO. 2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE(K400) ACCELERATOR PEDAL POSITION SENSOR NO. 2 SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCEACCELERATOR PEDAL POSITION SENSORAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)1. DTC IS ACTIVEIf any Sensor reference or supply voltage DTCs are present, perform the applicable diagnostic procedure before continuing with this test.The APP Sensor 2 signal should always be approximately 1/2 the voltage of the APP Sensor 1 signal.Ignition on, engine not running.With the scan tool, Clear DTCs in the Engine Control Module (ECM).Test drive the vehicle.With the scan tool, select View DTCs.Is the status Active for this DTC?YesGo To 2 NoRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)2. ACCELERATOR PEDAL POSITION SENSOR CIRCUIT OPEN OR HIGH RESISTANCE

Turn the ignition off.Disconnect the APP Sensor harness connector.Disconnect the ECM harness connector.Measure the resistance of the (F855) Accelerator Pedal Position Sensor No. 1 5 Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.Measure the resistance of the (K23) Accelerator Pedal Position Sensor No. 1 Signal circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.Measure the resistance of the (K167) Accelerator Pedal Position Sensor No. 1 Sensor Ground circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.Measure the resistance of the (F856) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.Measure the resistance of the (K29) Accelerator Pedal Position Sensor No. 2 Signal circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.Measure the resistance of the (K400) Accelerator Pedal Position Sensor No. 2 Sensor Ground circuit between the Accelerator Pedal Position Sensor harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms for each of the circuits?YesReplace the Accelerator Pedal Position Sensor.NoRepair the circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)