Service Information

Spark

DTC 7

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC 7: Mode Valve Actuator Malfunction

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition	DTC 7	DTC 7	--	--
Signal	DTC 7	DTC 7	DTC 7	--
Low Reference	--	DTC 7	DTC 7	--

Stepper motors are used for air distribution control. With the appropriate switches at the HVAC control, the desired air distribution flap position can be put in. The selected values are passed to the HVAC control via the LIN-Bus. The HVAC control supplies the ignition voltage.

Conditions for Running the DTC

The ignition is turned ON.

Conditions for Setting the DTC

HVAC control does not receive LIN data from the actuator.

Action Taken When the DTC Sets

The DTC will flash on the HVAC control display.

Conditions for Clearing the DTC

•	DTC will be cleared when restarting the engine.

•	DTC will be cleared when pushing the AUTO switch.

•	DTC will be cleared when rotating the fan control knob to 0.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the M37 Mode Valve Actuator.
Test for less than 10 Ω between the low reference circuit terminal 2 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance.

Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short circuit to ground or open/high resistance. If the circuit tests normal, replace the HVAC control.

Test for 10--14 V between the serial data circuit terminal 3 and the low reference circuit terminal 2.

⇒	If not within the specified range, test the serial data circuit for a short circuit to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control.

Disconnect the harness connector at the K33 HVAC Control.
Ignition ON, Test for less than 0.5 V between the serial data circuit terminal 3 and ground.

⇒	If greater than the specified range, test the serial data circuit for a short to voltage.

If the circuit test normal, replace the M37 Mode Valve Actuator.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Mode Valve Actuator Replacement : Right Hand Drive → Left Hand Drive

•	Heater and Air Conditioning Control Replacement