DTC C11F0 or C11F1

Engine Mechanical - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5246700 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC C11F0 Engine Mount 1 Control Circuit DTC C11F1 Engine Mount 2 Control Circuit Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performanc
B+	C11F0, C11F1	C11F0, C11F1	—	—
Control — 1	C11F0	C11F0	C11F0	—
Control — 2	C11F1	C11F1	C11F1	—

Circuit/System Description

Circuit	Description
B+	Supplied from a fuse.
Control — 1	The output circuit is switched to 12 V to activate the component.
Control — 2	The output circuit is switched to ground to activate the component.

	Component	Description
	K20 Engine Control Module	The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.
	Q80L Engine Mount Solenoid Valve -	A solenoid valve is an electro-mechanically operated
	Left © 2023 General	Mvoatlovres.. T hAell vriaglhvtes isre csoenrvtreodll.ed by an electric current

Component	Description
	through the solenoid.
Q80R Engine Mount Solenoid Valve - Right	A solenoid valve is an electro-mechanically operated valve. The valve is controlled by an electric current through the solenoid.

For an overview of the component/system, refer to: Active Engine Mount Description and Operation Conditions for Running the DTC C11F0, C11F1 Engine = Running Ignition Voltage = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC C11F0, C11F1 Control Circuit = Commanded state does not match the actual state — For greater than 1 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type C DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type C DTC Reference Information Schematic Reference Engine Mechanical Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

1. Ignition » On / Vehicle » In Service Mode
2. Verify there are no related DTCs set in the following system: Engine Mount System ⇒ If a related DTC is not set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a related DTC is set
3. Perform the scan tool function: Engine Mount Control Circuit » On and Off ⇒ If the component does not turn On and Off Refer to Circuit/System Testing. ⇓ If the component turns On and Off
4. All OK. Circuit/System Testing

Note

The left engine mount/mount actuator or solenoid valve-left is also referred to as engine mount/mount actuator or solenoid valve number 1. The right engine mount/mount actuator or solenoid valve-right is also referred to as engine mount/mount actuator or solenoid valve number 2.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector: Q80L Engine Mount Solenoid Valve - Left & Q80R Engine Mount Solenoid Valve - Right
3. Ignition » On / Vehicle » In Service Mode
4. Verify a test lamp turns On between the test points: B+ circuit @ Component harness & Ground ⇒ If the test lamp does not turn On and the circuit fuse is OK 4.1. Ignition/Vehicle » Off & Remove » Test lamp 4.2. Test for less than 2 Ω between the test points: B+ circuit @ Component harness & Output terminal @ Q80 Fuse ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse. Or ⇒ If less than 2 Ω » Refer to: Power Mode Mismatch ⇒ If the test lamp does not turn On and the circuit fuse is open 4.1. Ignition/Vehicle » Off & Remove » Test lamp 4.2. Test for infinite resistance between the test points: B+ circuit @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇒ If infinite resistance » Replace the appropriate component: Q80L Engine Mount Solenoid Valve - Left or Q80R Engine Mount Solenoid Valve - Right ⇓ If the test lamp turns On
5. Connect a test lamp between the test points: Control circuit terminal 2 & B+
6. Perform the scan tool control function: Engine Mount Actuator Output 1 & Engine Mount Actuator Output 2 — On and Off Verify the test lamp turns On and Off. ⇒ If the test lamp is always Off 6.1. Ignition/Vehicle » Off & Remove » Test lamp 6.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 6.3. Test for infinite resistance between the test points: Control circuit terminal 2 & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇓ If infinite resistance 6.4. Test for less than 2 Ω between the test points: Control circuit terminal 2 & The other end of the circuit ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇒ If the test lamp is always On 6.1. Ignition/Vehicle » Off & Remove » Test lamp 6.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 6.3. Test for less than 1 V between the test points: Control circuit terminal 2 & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇒ If less than 1 V » Replace the component: K20 Engine Control Module ⇓ If the test lamp turns On and Off
7. Replace the appropriate component: Q80L Engine Mount Solenoid Valve - Left or Q80R Engine Mount Solenoid Valve - Right
8. Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not set. ⇒ If the DTC sets Replace the component: K20 Engine Control Module ⇓ If the DTC is not set
9. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References