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 1 circuit for 0.10 seconds.Possible CausesINTERMITTENT DTC5-VOLT SUPPLY CIRCUIT SHORTED TO GROUNDBOOST PRESSURE SENSORFUEL PRESSURE SENSORCAMSHAFT POSITION SENSORENGINE 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. Each 5–Volt Supply source is split into parallel circuits to provide 5 volts to multiple sensors. Sensor Supply 1 provides 5 volts to the Camshaft Position Sensor, Boost Pressure Sensor and the Fuel Pressure Sensor.1. CHECK FOR ACTIVE DTCTurn the ignition on.With the scan tool, erase ECM DTCs.With the scan tool, 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. CAMSHAFT POSITION SENSOR

Turn the ignition off.Disconnect the CMP Sensor harness connector.Turn the ignition on.Measure the voltage of the (K844) Camshaft Position Sensor 5 Volt Supply circuit at the CMP Sensor harness connector.Is the voltage above 4.6 volts?YesReplace the Camshaft Position Sensor.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To33. BOOST PRESSURE SENSOR

Turn the ignition off.Disconnect the Boost Pressure Sensor harness connector.Turn the ignition on.Measure the voltage of the (K356) Boost Pressure Sensor 5 Volt Supply circuit at the Boost Pressure Sensor harness connector.Is the voltage above 4.6 volts?YesReplace the Boost Pressure Sensor.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To44. FUEL PRESSURE SENSOR

Turn the ignition off.Disconnect the Fuel Pressure Sensor harness connector.Turn the ignition on.Measure the voltage of the (K350) Fuel Pressure Sensor 5 Volt Supply circuit at the Fuel Pressure Sensor harness connector.Is the voltage above 4.6 volts?YesReplace the Fuel Pressure Sensor.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To55. 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Turn the ignition off.Disconnect the ECM harness connectors.Measure the resistance between ground and the (K356) Boost Pressure Sensor 5 Volt Supply circuit at the Boost Pressure Sensor harness connector.Measure the resistance between ground and the (K844) Camshaft Position Sensor 5 Volt Supply circuit at the CMP Sensor harness connector.Measure the resistance between ground and the (K350) Fuel Pressure Sensor 5 Volt Supply circuit at the Fuel Pressure Sensor harness connector.Is the resistance above 1000 ohms for each circuit?YesGo To6NoRepair the 5 Volt Supply circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)6. ENGINE CONTROL MODULE (ECM)Inspect the (K844) Camshaft Position Sensor 5 Volt Supply circuit between the CMP harness connector and the ECM harness connector.Inspect the (F855) Boost Pressure Sensor 5 Volt Supply circuit between the Boost Pressure Sensor harness connector and the ECM harness connectorInspect the (F855) Fuel Pressure Sensor 5 Volt Supply circuit between the Fuel Pressure Sensor harness connector and the ECM harness connectorLook for any chafed, pierced, pinched, or partially broken wires.Look for broken, bent, pushed out or corroded terminals.Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.Look for the data to change or for the DTC to reset during the wiggle test.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 the ECM in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)