For a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on and no other APPS No.2 DTCs present.Set Condition:When APP Sensor No.2 voltage is too high. Idle is additionally forced any time the brake is applied or failed. Acceleration rate and Engine output are limited. One trip fault and the code will set within 5 seconds. ETC light is flashing.Possible Causes(K29) APP SIGNAL 2 CIRCUIT SHORTED TO BATTERY VOLTAGE(K29) APP SIGNAL 2 SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT(K29) APP SIGNAL 2 SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT(K400) APP RETURN 2 CIRCUIT OPENAPP SENSORPCMAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).1. APPS NO.2 VOLTAGE ABOVE 3.0 VOLTSWhen this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode.Ignition on, engine not running.With a scan tool, read the APP Sensor No.2 voltage.Diagnose any 5-Volt Supply DTCs before continuing.Is the voltage above 3.0 volts?YesGo To 2NoGo To 82. ACCELERATOR PEDAL POSITION SENSORTurn the ignition off.Disconnect the APPS harness connector.Ignition on, engine not running.With a scan tool, monitor the Accelerator Pedal Position Sensor voltage.Is the voltage above 0 volts?YesGo To 3NoReplace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)3. (K29) APP SIGNAL 2 CIRCUIT SHORTED TO BATTERY VOLTAGE

Turn the ignition off.Disconnect the C3 PCM harness connector.Ignition on, engine not running.Measure the voltage on the (K29) APP Signal 2 circuit in the APP Sensor harness connector.Is the voltage above 0 volts?YesRepair the short to battery voltage in the (K29) APP Signal 2 circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 44. (K29) APP SIGNAL 2 CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT

Turn the ignition off.Measure the resistance between the (K29) APP Signal 2 circuit and the (F856) 5-volt Supply circuit in the APP Sensor harness connector.Is the resistance below 10 ohms?YesRepair the short between the (K29) APP Signal 2 circuit and the (F856) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 55. (K29) APP SIGNAL 2 CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Measure the resistance between the (K29) APP Signal 2 circuit and the (F855) 5-volt Supply circuit in the APP Sensor harness connector.Is the resistance below 10 ohms?YesRepair the short between the (K29) APP S Signal 2 circuit and the (F855) 5-volt Supply circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 66. (K400) APP RETURN 2 CIRCUIT OPEN

Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.Measure the resistance of the (K400) APP Return 2 circuit from the APP Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 7NoRepair the open in the (K400) APP Return 2 circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)7. PCMBefore continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were there any problems found?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace and program the Powertrain Control Module per Service Information.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)8. APP SENSOR NO.2 SWEEPIgnition on, engine not running.With a scan tool, monitor the Accelerator Pedal Position Sensor voltage.Slowly press the Accelerator Pedal down.Does voltage start at approximately 0.22 of a volt and go above 2.31 volts with a smooth transition?YesRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace the APP Sensor Assembly per Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)