For a complete wiring diagram Refer to Section 8WThe Fuel Quantity Solenoid (FQS) is a solenoid operated valve designed to regulate fuel volume to the fuel injection pump. The FQS valve is positioned in the inlet side of the fuel injection pump assembly. The solenoid receives 12–volt power and a duty-cycle ground signal from the ECM. When the solenoid is not actuated (no ground signal from the ECM), the fuel injection pump inlet passage is open allowing full fuel flow to the pump chamber. When the ECM grounds the FQS control signal the solenoid valve closes the fuel inlet passage, preventing fuel from entering the pump chamber.When Monitored:With the ignition on and the ECM command of the Fuel Quantity Solenoid off.Set Condition:The ECM detects that the (K365) Fuel Quantity Solenoid Control circuit voltage is shorted to ground for 0.2 seconds.Possible CausesINTERMITTENT DTC(K365) FUEL QUANTITY SOLENOID CONTROL CIRCUIT SHORTED TO GROUND(K365) FUEL QUANTITY SOLENOID CONTROL CIRCUIT OPEN OR HIGH RESISTANCE(K366) FUEL QUANTITY SOLENOID 12 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCEASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCEFUEL QUANTITY 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 Fuel Quantity Solenoid at 100%.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. (K365) FUEL QUANTITY SOLENOID CONTROL CIRCUIT SHORTED TO GROUND

Turn the ignition off.Disconnect the Fuel Quantity Solenoid harness connector.Disconnect the Engine Control Module (ECM) harness connector.Measure the resistance between ground and the (K365) Fuel Quantity Solenoid Control circuit in the Fuel Quantity Solenoid harness connector.Is the resistance above 1000 ohms?YesGo to 3NoRepair the (K365) Fuel Quantity Solenoid Control circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)3. (K365) FUEL QUANTITY SOLENOID CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K365) Fuel Quantity Solenoid Control circuit between the Fuel Quantity Solenoid harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesGo to 4NoRepair the (K365) Fuel Quantity Solenoid Control circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)4. (K366) FUEL QUANTITY SOLENOID 12 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K366) Fuel Quantity Solenoid 12 Volt Supply circuit between the Fuel Quantity Solenoid harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesGo to 5NoRepair the (K366) Fuel Quantity Solenoid 12 Volt Supply circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5. ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE

Remove the ASD Relay.Connect a jumper wire between cavity 30 and cavity 87 in the ASD Relay harness connector.Using a 12-volt test light connected to ground, check the ASD Relay Output circuit in ECM harness connector C2 cavities 1, 3 and 5.Did the test light illuminate for each circuit?YesGo To6NoRepair the ASD Relay Output circuit(s) for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)6. FUEL QUANTITY SOLENOID

Connect the Engine Control Module (ECM) harness connector.Turn the ignition on.With the scan tool, actuate the Fuel Quantity Solenoid (CP3 Metering Pump) to 100%.Using a 12 volt test light connected to 12 volts, check the (K365) Fuel Quantity Solenoid Control circuit in the Fuel Quantity 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.With the scan tool, actuate the Fuel Quantity Solenoid (CP3 Metering Pump) to 0%.Using a 12 volt test light connected to 12 volts, check the (K365) Fuel Quantity Solenoid Control circuit in the Fuel Quantity Solenoid harness connector.The test light should not be illuminated.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 with the actuation at 100% and not illuminated with the actuation at 0%?YesReplace the Fuel Quantity Solenoid in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 77. ENGINE CONTROL MODULE (ECM)Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Quantity 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)