For a complete wiring diagram Refer to Section 8WThe EGR Solenoid is a two-wire electrically operated vacuum solenoid used to control the vacuum supply to the EGR Solenoid. The Solenoid receives 12 volts from the ECM/ASD relay and a pulse-width modulated ground signal from the ECM. The solenoid contains 2 vacuum ports. Vacuum from the vacuum pump system is supplied to one of the ports. The other port is connected to the EGR Solenoid. With the solenoid de-energized (off) the vacuum supply is blocked within the solenoid, prohibiting vacuum from reaching the EGR Solenoid. When the ECM energizes (grounds) the solenoid, the vacuum supply is applied to the EGR Solenoid causing the EGR Solenoid to open.When Monitored:With the ignition on and the EGR Solenoid command off.Set Condition:The ECM detects an open on the (K35) EGR Solenoid Control circuit for 0.5 second.Possible CausesINTERMITTENT DTC(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND(K35) EGR SOLENOID CONTROL CIRCUIT OPEN OR HIGH RESISTANCE(F344) FUSED ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCEEGR SOLENOIDENGINE CONTROL MODULE (ECM)Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)1. DTC IS ACTIVEIgnition on, engine not running.With the scan tool, Clear DTCs in the Engine Control Module (ECM).With the scan tool, actuate the Exhaust Gas Recirc Positioner.Monitor the scan tool for at least two minutes.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. (K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND

Turn the ignition off.Disconnect the EGR Solenoid harness connector.Disconnect the Engine Control Module (ECM) harness connector.Measure the resistance between ground and the (K35) EGR Solenoid Control circuit in the EGR Solenoid harness connector.Is the resistance above 1000 ohms?YesGo to 3NoRepair the (K35) EGR Solenoid Control circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)3. (K35) EGR SOLENOID CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K35) EGR Solenoid Control circuit between the EGR Solenoid harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesGo to 4NoRepair the (K35) EGR Solenoid Control circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)4. (F344) FUSED ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

Connect the Engine Control Module (ECM) connector.Turn the ignition on.Using a 12 volt test light connected to ground, check the (F344) Fused ASD Relay Output circuit at the EGR Solenoid harness connector.The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.Is the test light illuminated and bright?YesGo to 5NoRepair the (F344) Fused ASD Relay Output circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5. EGR SOLENOID

With the scan tool, actuate the Exhaust Gas Recirc Positioner to 100%.Using a 12 volt test light connected to 12 volts, check the (K35) EGR Solenoid Control circuit in the EGR Solenoid harness connector.The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.The circuit will remain actuated by the controller for 30 seconds. Be certain the actuation is active when checking the circuit.Is the test light illuminated and bright?YesReplace the EGR Solenoid in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 66. ENGINE CONTROL MODULE (ECM)Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Solenoid and the Engine Control Module (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 the Engine Control Module (ECM) in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)