Recirc Calibration Fault - (MTC)

RECIRC CALIBRATION FAULT - MTC





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
When the HVAC Door Recalibration is executed.

- Set Condition:
If the Recirculation Door span is found outside the tolerance due to: open door actuator electrical circuits; a bad door actuator; broken door linkage; a bound up door; door actuator electrical circuits shorted to voltage; door actuator electrical circuits shorted to ground. A short to ground on the door actuator electrical circuits will also set door actuator overcurrent faults.





1. ACTIVE DTC(S) PRESENT

NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must be repaired before diagnosing Calibration fault messages.

Turn the ignition on.
With the scan tool, check for DTCs.
Does the scan tool display this DTC as active?

Yes

- Go To2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

2. RECIRCULATION LINKAGE/DOOR BINDING

NOTE: After completing HVAC Door Recalibration, the scan tool will store the total span and the status of each door actuator. Selecting HVAC Door Cal Monitor in System Tests will display this information.

With the scan tool in HVAC, select System Tests, and then select HVAC Door Cal Monitor.
Which message does the scan tool display for Blend Status?

No Pulses

- Go To3

Too Few Pulses

- Inspect the A/C Heater Housing Assembly for a condition causing the Recirculation linkage/door to bind. Repair as necessary .
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

Too Many Pulses

- Remove the Door Actuator from the HVAC housing. By hand, attempt to rotate the Actuator in both directions. Also, inspect for disconnected, missing, broken door linkage, warped or broken door. Repair as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

Broken Linkage

- Remove Door Actuator from housing. By hand, attempt to rotate Actuator in both directions. Also, inspect for disconnected, missing, or broken door linkage, and a warped or broken door. Repair as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

3. CHECK THE DOOR ACTUATOR'S CIRCUIT RESISTANCE




Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the (C32) Recirculation Door Driver (A) circuit and the (C34) Common Door Driver (B) circuit.
Does the ohm meter read open circuit?

Yes

- Go To4

No

- Go To5

4. DOOR ACTUATOR DRIVER CIRCUIT OPEN




Disconnect the Recirculation Door Actuator harness connector.
Remove the Recirculation Door Actuator from the A/C Heater Housing Assembly.
Measure the resistance of the (C32) Recirculation Door Driver (A) circuit between the A/C Heater Control C1 harness connector and the Recirculation Door Actuator harness connector.
Does the scan tool read open circuit?

Yes

- Repair the (C32) Recirculation Door Driver circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To5

5. A/C HEATER CONTROL
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
With the scan tool in HVAC, System Tests, actuate the HVAC Door Recalibration Test.
What message does the scan tool display?

Same message as from start of test

- Replace the A/C Heater Control.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

Different message than from start of test

- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for conditions that caused the original test message to set. Repair as necessary. Then, return to Test 1 of this Symptom.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

No fault message

- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for conditions that caused the original test message to set. Repair as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.