For a complete wiring diagram Refer to Section 8WWhen Monitored:With the ignition on.Set Condition:The ECM detects low voltage on the Sensor Supply 2 circuit for 0.10 secondsPossible CausesINTERMITTENT DTCACCELERATOR PEDAL POSITION SENSOREXHAUST DIFFERENTIAL PRESSURE SENSORINLET AIR PRESSURE SENSOROIL PRESSURE SENSORMASS AIR FLOW SENSOR5-VOLT SUPPLY CIRCUIT SHORTED TO GROUNDENGINE CONTROL MODULE (ECM)Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)The ECM contains 3 internal 5–Volt Sensor Supply sources and one 8–Volt source. Each 5–Volt Supply source is split into parallel circuits to provide 5 volts to multiple sensors. Sensor Supply 2 provides 5 volts to the Inlet Pressure Sensor, Exhaust Differential Pressure Sensor, Engine Oil Pressure Sensor, and the Accelerator Pedal Position Sensor 2 and 8 volts to the Mass Air Flow Sensor.1. CHECK FOR ACTIVE DTCTurn the ignition on.With the scan tool, erase ECM DTCs.Turn the ignition off for 10 seconds.Turn the ignition on.With the scan tool, select View DTCs.Is the status Active for this DTC?YesGo To2NoRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)2. ACCELERATOR PEDAL POSITION SENSOR

Turn the ignition off.Disconnect the APP Sensor harness connector.Turn the ignition on.Measure the voltage of the (F856) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit at the APP Sensor harness connector.Is the voltage above 4.6 volts?YesReplace the Accelerator Pedal Position Sensor.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To33. EXHAUST DIFFERENTIAL PRESSURE SENSOR

Turn the ignition off.Disconnect the Exhaust Differential Pressure Sensor harness connector.Turn the ignition on.Measure the voltage of the (K354) Exhaust Differential Pressure Sensor 5 Volt Supply circuit.Is the voltage above 4.6 volts?YesReplace the Exhaust Differential Pressure Sensor.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To44. INLET AIR PRESSURE SENSOR

Turn the ignition off.Disconnect the Inlet Air Pressure Sensor harness connector.Turn the ignition on.Measure the voltage of the (K668) Inlet Air Pressure Sensor 5 Volt Supply circuit.Is the voltage above 4.6 volts?YesReplace the Inlet Air Pressure Sensor.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To55. ENGINE OIL PRESSURE SENSOR

Turn the ignition off.Disconnect the Engine Oil Pressure Sensor harness connector.Turn the ignition on.Measure the voltage of the (K357) Engine Oil Pressure Sensor 5 Volt Supply circuit.Is the voltage above 4.6 volts?YesReplace the Engine Oil Pressure Sensor.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To66. MASS AIR FLOW SENSOR

Turn the ignition off.Disconnect the MAF Sensor harness connector.Turn the ignition on.Measure the voltage of the (F888) MAF Sensor 5 Volt Supply circuit.Is the voltage above 4.6 volts?YesReplace the MAF Sensor.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To77. 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Turn the ignition off.Disconnect the ECM harness connectors.Measure the resistance between ground and the (F856) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit.Measure the resistance between ground and the (K354) Exhaust Differential Pressure Sensor 5 Volt Supply circuit.Measure the resistance between ground and the (K668) Inlet Air Pressure Sensor 5 Volt Supply circuit.Measure the resistance between ground and the (K357) Engine Oil Pressure Sensor 5 Volt Supply circuit.Measure the resistance between ground and the (F888) MAF Sensor 8 Volt Supply circuit.Is the resistance above 1000 ohms for each circuit?YesGo To8NoRepair the appropriate 5-Volt Supply circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)8. ENGINE CONTROL MODULE (ECM)Turn the ignition off.Inspect the (F856) Accelerator Pedal Position Sensor No. 2 5 Volt Supply circuit between the Accelerator Pedal Position Sensor and the ECM.Inspect the (K354) Exhaust Gas Pressure Sensor 5 Volt Supply circuit between the Exhaust Differential Pressure Sensor and the ECM.Inspect the (K668) Inlet Air Pressure Sensor 5 Volt Supply circuit between the Inlet Air Pressure Sensor and the ECM.Inspect the (K357) Oil Pressure Sensor 5 Volt Supply circuit between the Engine Oil Pressure Sensor and the ECM.Inspect the (F888) MAF Sensor 8 Volt Supply circuit between the MAF Sensor and the ECM.Look for any chafed, pierced, pinched, or partially broken wires.Look for broken, bent, pushed out or corroded terminals.Refer to any Technical Service Bulletins that may apply.Were any problems found?YesRepair as necessary.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace and program the Engine Control Module in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)