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MTC 15

15-MODE NOT RESPONDING/STALLED (MTC)


15-Mode Not Responding/Stalled (MTC):




WHEN MONITORED
When driving the Mode Door Actuator.

SET CONDITION
If the A/C Heater Control fails to detect commutator pulses.

POSSIBLE CAUSES
- Mode door seized, binding, obstructed
- (C66) mode door driver (A) circuit shorted to voltage
- (C266) mode door driver (B) circuit shorted to voltage
- (C66) mode door driver (A) circuit shorted to ground
- (C266) mode door driver (B) circuit shorted to ground
- (C66) mode door driver (A) circuit shorted to other door driver circuit(s)
- (C266) mode door driver (B) circuit shorted to other door driver circuit(s)
- (C66) mode door driver (A) circuit shorted to (C266) mode door driver (B) circuit
- (C66) mode door driver (A) circuit open
- (C266) mode door driver (B) circuit open
- Mode door actuator
- A/C heater control

NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test (MTC) for stored DTC test procedures. HVAC System Test (MTC)

DIAGNOSTIC TEST

1. RUN THE ACTUATOR CALIBRATION FUNCTION & THEN CHECK FOR DTCs IN THE A/C HEATER CONTROL
Actuate the Actuator Calibration function by performing the following:
- Turn the ignition on.
- Turn the blower control to off.
- Press the EBL mode switch down for 5 seconds and then release it.
- Wait approximately 90 seconds for the calibration process to run to completion before proceeding.

Turn the ignition off, wait 10 seconds, and turn the ignition on.
Actuate the Display DTC function by performing the following:
- Turn the blower control on.
- Press the A/C mode switch down, turn the blower control to off, wait 3 seconds and then release the A/C mode switch.

NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated.

Read DTCs from the flashing A/C status indictor.

Q: Does the A/C status indicator flash DTC 22?

YES: Diagnose and Repair the DTC. Refer to HVAC related symptoms. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 2

2. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR A SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Turn the ignition on.
Measure the voltage of the (C66) Mode Door Driver (A) circuit.

Q: Is the voltage above 0.2 volts?

YES: Repair the (C66) Mode Door Driver (A) circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. CHECK (C266) MODE DOOR DRIVER (B) CIRCUIT FOR A SHORT TO VOLTAGE




Measure the voltage of the (C266) Mode Door Driver (B) circuit.

Q: Is the voltage above 0.2 volts?

YES: Repair the (C266) Mode Door Driver (B) circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 4

4. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance of the (C66) Mode Door Driver (A) circuit between ground and the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C66) Mode Door Driver (A) circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 5

5. CHECK (C266) MODE DOOR DRIVER (B) CIRCUIT FOR A SHORT TO GROUND




Measure the resistance of the (C266) Mode Door Driver (B) circuit between ground and the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C266) Mode Door Driver (B) circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 6

6. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)




Measure the resistance between the (C66) Mode Door Driver (A) circuit and the (C255) Left Blend Door Driver (B) circuit, the (C55) Left Blend Door Driver (A) circuit, the (C268) Recirculation Door Driver (B) circuit, and the (C68) Recirculation Door Driver (A) circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms between the (C66) Mode Door Driver (A) circuit and any of the other door driver circuits?

YES: Repair the circuits with a resistance below 10k ohms for a short to the (C66) Mode Door Driver (A) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 7

7. CHECK (C266) MODE DOOR DRIVER (B) CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUIT(S)




Measure the resistance between the (C266) Mode Door Driver (B) circuit and the (C255) Left Blend Door Driver (B) circuit, the (C55) Left Blend Door Driver (A) circuit, the (C268) Recirculation Door Driver (B) circuit, and the (C68) Recirculation Door Driver (A) circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms between the (C266) Mode Door Driver (B) circuit and any of the other door driver circuits?

YES: Repair the circuits with a resistance below 10k ohms for a short to the (C266) Mode Door Driver (B) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 8

8. CHECK MODE DOOR ACTUATOR CIRCUIT RESISTANCE




Measure the resistance between the (C66) Mode Door Driver (A) circuit and the (C266) Mode Door Driver (B) circuit in the A/C Heater Control C2 harness connector.

Q: What is the resistance?

Below 30 Ohms
Go To 9
Above 70 Ohms
Go To 10
30 to 70 Ohms
Go To 12

9. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR A SHORT TO (C266) MODE DOOR DRIVER (B) CIRCUIT




Disconnect the Mode Door Actuator harness connector.
Measure the resistance between the (C66) Mode Door Driver (A) circuit and the (C266) Mode Door Driver (B) circuit in the A/C Heater Control C2 harness connector.

Q: Is the resistance below 10k ohms?

YES: Repair the (C66) Mode Door Driver (A) circuit for a short to the (C266) Mode Door Driver (B) circuit. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Mode Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

10. CHECK (C66) MODE DOOR DRIVER (A) CIRCUIT FOR AN OPEN




Disconnect the Mode Door Actuator harness connector.
Measure the resistance of the (C66) Mode Door Driver (A) circuit between the A/C Heater Control C2 harness connector and the Mode Door Actuator harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Go To 11
NO: Repair the (C66) Mode Door Driver (A) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

11. CHECK (C266) MODE DOOR DRIVER (B) CIRCUIT FOR AN OPEN




Measure the resistance of the (C266) Mode Door Driver (B) circuit between the A/C Heater Control C2 harness connector and the Mode Door Actuator harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Mode Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (C266) Mode Door Driver (B) circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

12. RUN THE ACTUATOR CALIBRATION FUNCTION & THEN CHECK FOR DTCs IN THE A/C HEATER CONTROL
Reconnect the A/C Heater Control C2 harness connector.
Actuate the Actuator Calibration function by performing the following:
- Turn the ignition on.
- Turn the blower control to off.
- Press the EBL mode switch down for 5 seconds and then release it.
- Wait approximately 90 seconds for the calibration process to run to completion before proceeding.

Turn the ignition off, wait 10 seconds, and turn the ignition on.
Actuate the Display DTC function by performing the following:
- Turn the blower control on.
- Press the A/C mode switch down, turn the blower control to off, wait 3 seconds and then release the A/C mode switch.

NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated.

Read DTCs from the flashing A/C status indictor.

Q: Does the A/C status indicator flash DTC 15?

YES: Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Using the wiring diagram as a guide inspect the wiring and connectors for a condition causing an intermittent loss of commutator pulses from the Mode Door Actuator. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
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