Chrysler Town, Dodge Caravan. Manual — part 822
RECIRCULATION CALIBRATION FAULT - MTC
When Monitored:
When the HVAC Door Recalibration is executed.
Set Condition:
If the recirculation door’s 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 voltage or ground on the door actuator electrical circuits will also set
door actuator overcurrent faults.
ZONE CALIBRATION FAULT - MTC
When Monitored:
When the HVAC Door Recalibration is executed.
Set Condition:
If the driver (zone) blend door’s 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 voltage or ground on the door actuator electrical circuits will
also set door actuator overcurrent faults.
POSSIBLE CAUSES
CHECK FOR ACTUATOR CIRCUIT TEST FAULT MESSAGES
CHECK FOR ACTIVE HVAC DTCS
MODE LINKAGE/DOOR BINDING
PASSENGER BLEND LINKAGE/DOOR BINDING
DRIVER BLEND LINKAGE/DOOR BINDING
RECIRCULATION LINKAGE/DOOR BINDING
REAR MODE LINKAGE/DOOR BINDING
REAR BLEND LINKAGE/DOOR BINDING
A/C - HEATER CONTROL MODULE
DOOR ACTUATOR DRIVER CIRCUIT OPEN
COMMON DOOR DRIVER CIRCUIT OPEN
DOOR ACTUATOR
A/C - HEATER CONTROL MODULE
REAR DOOR ACTUATOR DRIVER CIRCUIT OPEN
REAR COMMON DOOR DRIVER CIRCUIT OPEN
DOOR ACTUATOR
BROKEN ACTUATOR/LINKAGE/DOOR
524
HEATING & A/C
BLEND CALIBRATION FAULT - MTC —
Continued
TEST
ACTION
APPLICABILITY
1
NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must
be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the DRBIII
t in HVAC, System Tests, actuate the Actuator Circuit Test.
Does the DRBIII
t display any Actuator Circuit Test fault messages?
All
Yes
→ Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must
be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the DRBIII
t, read active HVAC DTCs.
Does the DRBIII
t display any active HVAC DTCs?
All
Yes
→ Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Which HVAC Door Recalibration fault message is present?
All
Mode Calibration Fault
Blend Calibration Fault
Zone Calibration Fault
Recirculation Calibration Fault
Rear Mode Door Calibration Fault
Rear Blend Door Calibration Fault
525
HEATING & A/C
BLEND CALIBRATION FAULT - MTC —
Continued
TEST
ACTION
APPLICABILITY
4
NOTE: After completing HVAC Door Recalibration, the DRBIII
t 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 DRBIII
t in HVAC, select System Tests, and then select HVAC Door Cal
Monitor.
Which message does the DRBIII
t display for Mode Status?
All
No Pulses
Too Few Pulses
Inspect the A/C - Heater Housing Assembly for a condition causing
the mode linkage/door to bind. Repair as necessary in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Too Many Pulses
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Broken Linkage
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
5
NOTE: After completing HVAC Door Recalibration, the DRBIII
t 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 DRBIII
t in HVAC, select System Tests, and then select HVAC Door Cal
Monitor.
Which message does the DRBIII
t display for Blend Status?
All
No Pulses
Too Few Pulses
Inspect the A/C - Heater Housing Assembly for a condition causing
the passenger blend linkage/door to bind. Repair as necessary in
accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Too Many Pulses
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Broken Linkage
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
526
HEATING & A/C
BLEND CALIBRATION FAULT - MTC —
Continued
TEST
ACTION
APPLICABILITY
6
NOTE: After completing HVAC Door Recalibration, the DRBIII
t 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 DRBIII
t in HVAC, select System Tests, and then select HVAC Door Cal
Monitor.
Which message does the DRBIII
t display for Zone Status?
All
No Pulses
Too Few Pulses
Inspect the A/C - Heater Housing Assembly for a condition causing
the driver blend linkage/door to bind. Repair as necessary in
accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Too Many Pulses
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Broken Linkage
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
7
NOTE: After completing HVAC Door Recalibration, the DRBIII
t 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 DRBIII
t in HVAC, select System Tests, and then select HVAC Door Cal
Monitor.
Which message does the DRBIII
t display for Recirc Status?
All
No Pulses
Too Few Pulses
Inspect the A/C - Heater Housing Assembly for a condition causing
the recirculation linkage/door to bind. Repair as necessary in
accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Too Many Pulses
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Broken Linkage
Remove door actuator from housing. By hand, attempt to rotate
actuator in both directions. Also, inspect for disconnected, miss-
ing, or broken door linkage, and a warped or broken door. Repair
as necessary in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
527
HEATING & A/C
BLEND CALIBRATION FAULT - MTC —
Continued
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