54–REAR MODE DOOR LINKAGE BROKEN (MTC)
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
NOTE: Diagnose and repair Actuator Circuit Test faults (DTC 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, and 72)
before diagnosing Overcurrent faults (DTC 41, 42, 43, and 44) and Calibration faults (DTC 18, 21, 22, 23, 24,
25, 45, 46, 47, 48, 51, 52, 53, 54, 55, and 56). Diagnose and repair Overcurrent faults (DTC 41, 42, 43, and 44)
before diagnosing Calibration faults (DTC 18, 21, 22, 23, 24, 25, 45, 46, 47, 48, 51, 52, 53, 54, 55, and 56).
The purpose of actuator calibration is to determine the total span of door travel between physical stops. To calibrate
the actuator, the A/C Heater Control first moves the door to its soft stop, and then counts the number of pulses it
takes to move the door to its other stop. An expected range of span is stored in the control’s memory. If the A/C
Heater Control detects and excessive amount of commutator pulses when calibrating the rear mode door, this DTC
will set.
•
When Monitored:
During actuator calibration.
•
Set Condition:
If the A/C Heater Control detects and excessive amount of commutator pulses when calibrating the rear mode
door.
Possible Causes
ACTUATOR CIRCUIT TEST FAULTS PRESENT
OVERCURRENT FAULTS PRESENT
REAR MODE DOOR OR A/C HEATER HOUSING COMPONENTS DISCONNECTED, MISSING, BROKEN
REAR MODE DOOR ACTUATOR
A/C HEATER CONTROL
24 - 120
HVAC - ELECTRICAL DIAGNOSTICS
WK