Chrysler Town, Dodge Caravan. Manual — part 824
ZONE OVERCURRENT (ACTIVE) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C - Heater Control Module detects an excessive
current draw on any of the door driver circuits while attempting to drive the driver (zone)
blend door actuator. Only one overcurrent DTC can set per ignition cycle.
POSSIBLE CAUSES
RUN THE ACTUATOR CIRCUIT TEST
TEST
ACTION
APPLICABILITY
1
View repair
All
Repair
With the DRBIII
t in HVAC, System Tests, actuate the Actuator
Circuit Test. Read the Actuator Circuit Test message(s). Return to
the symptom list and choose the symptom(s).
If two or more drivelines are shorted together when running the
Actuator Ckt Test, the DRBIII
t may display Actuator Ckt Test
Passed even though Overcurrent DTCs are active. If this occurs,
refer to symptom Act Ckt Test Passed, Overcurrent DTCs Active.
Perform BODY VERIFICATION TEST - VER 1.
532
HEATING & A/C
BLEND OVERCURRENT (ACTIVE) - MTC —
Continued
Symptom:
BLOWER NOT ON HIGH - MTC
When Monitored and Set Condition:
BLOWER NOT ON HIGH - MTC
When Monitored:
When executing the Cooldown Test.
Set Condition:
This message will be displayed if the front blower is not operating at high
speed when executing the Cooldown Test.
POSSIBLE CAUSES
HVAC DTC(S) PRESENT
TEST SET UP CONDITIONS NOT MET
FRONT BLOWER/RELATED CIRCUITS
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read HVAC DTCs.
Does the DRBIII
t display any HVAC DTCs?
All
Yes
→ Return to the symptom list and choose the symptom(s). After the
repair is complete, with the DRBIII
t, erase the DTC(s). Cycle the
ignition switch. With the DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Was the front blower control set to high speed the entire time the Cooldown Test was
actuated?
All
Yes
→ Check the front blower motor and related circuits for front blower
operation problems. Repair as necessary. After repair is complete,
with the DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Start the engine. Set the Front Blower Front Control switch to
high speed. With the DRBIII
t, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
533
HEATING & A/C
Symptom List:
COOLDOWN TEST SENSOR FAILURE - MTC
COOLDOWN TIME EXCESSIVE FAULT - MTC
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be COOLDOWN TEST SENSOR
FAILURE - MTC.
When Monitored and Set Condition:
COOLDOWN TEST SENSOR FAILURE - MTC
When Monitored:
When executing the Cooldown Test.
Set Condition:
This message will be displayed if a fault is detected with the Evaporator
Temperature Sensor/circuit when executing the Cooldown Test.
COOLDOWN TIME EXCESSIVE FAULT - MTC
When Monitored:
When executing the Cooldown Test.
Set Condition:
This message will be displayed if the A/C system is unable to bring the
evaporator temperature down 6.7°C (20°F) within two minutes.
POSSIBLE CAUSES
HVAC DTC(S) PRESENT
CHECK THE PCM/ECM FOR DTCS
A/C SYSTEM TESTING
TEST
ACTION
APPLICABILITY
1
CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
system operation.
Turn the ignition on.
With the DRBIII
t, read HVAC DTCs.
Does the DRBIII
t display any HVAC DTCs?
All
Yes
→ Return to the symptom list and choose the symptom(s).
After repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
534
HEATING & A/C
TEST
ACTION
APPLICABILITY
2
CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
system operation.
Turn the ignition on.
With the DRBIII
t, check the PCM/ECM for DTCs.
Are any DTCs present?
All
Yes
→ Refer to Powertrain Diagnostic information for the related symp-
tom(s).
After repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Refer to the Service Information for additional Cooldown Test
related diagnostic information and testing procedures.
After repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
535
HEATING & A/C
COOLDOWN TEST SENSOR FAILURE - MTC —
Continued
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