Chrysler Voyager. Manual — part 271
BLEND OVERCURRENT (STORED) - 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 passenger
blend door actuator. Only one overcurrent DTC can set per ignition cycle.
CHECKSUM FAILURE (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the calculated check sum does not match the stored
value.
DEFOG SWITCH FAULT (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the EBL switch stays closed for 10 minutes.
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module sees abnormally high
voltage on the Evaporator Temperature Sensor Signal circuit.
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module sees abnormally low
voltage on the Evaporator Temperature Sensor Signal circuit.
LOOPBACK TEST FAILURE (STORED) - MTC
When Monitored:
When the A/C - Heater Control Module executes an internal loopback
test.
Set Condition:
If the A/C - Heater Control Module fails to send a message, or none of the
expected messages arrive for 5 seconds, an internal loopback test is executed. If the
internal loopback test fails, the DTC will set.
MODE OVERCURRENT (STORED) - 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 this actuator.
Only one overcurrent DTC can set per ignition cycle.
NO FUEL LEVEL MESSAGE RECEIVED (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module does not receive the
Fuel Level message from the PCM for more than 5 seconds.
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HEATING & A/C
A/C SWITCH FAULT (STORED) - MTC —
Continued
PCM COMMUNICATION FAILURE (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module does not receive the
Fuel message from the PCM for more than 5 seconds.
POWER SWITCH FAULT (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the Power switch stays closed for 10 minutes.
REAR BLEND OVERCURRENT (STORED) - 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 this actuator.
Only one overcurrent DTC can set per ignition cycle.
REAR BLEND POT CIRCUIT OPEN (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module sees voltage above
4.88 volts on the Rear Temperature Feedback Signal circuit.
REAR BLEND POT CIRCUIT SHORT (STORED) - MTC
When Monitored:
When the ignition is on.
Set Condition:
This DTC will set if the A/C - Heater Control Module sees voltage below
0.25 volts on the Rear Temperature Feedback Signal circuit.
REAR MODE OVERCURRENT (STORED) - 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 this actuator.
Only one overcurrent DTC can set per ignition cycle.
RECIRC OVERCURRENT (STORED) - 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 this actuator.
Only one overcurrent DTC can set per ignition cycle.
RECIRC SWITCH FAULT (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the Recirc switch stays closed for 10 minutes.
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A/C SWITCH FAULT (STORED) - MTC —
Continued
TX FAILURE (STORED) - MTC
When Monitored:
When the ignition is on.
Set Condition:
This DTC will set if the A/C - Heater Control Module is unable to send a
message.
VEHICLE ODOMETER FAILURE (STORED) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module does not receive the
Vehicle Odometer message from the PCM for more than 5 seconds.
ZONE OVERCURRENT (STORED) - 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
CHECK FOR ACTIVE HVAC DTCS AND SYSTEM TESTS FAULT MESSAGES
STORED CODE(S) TEST COMPLETE
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HEATING & A/C
A/C SWITCH FAULT (STORED) - MTC —
Continued
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 the A/C
system operation.
NOTE: Active codes must be resolved before diagnosing stored codes.
NOTE: Anytime a DTC becomes active, or a Cooldown Test fault message,
Actuator Circuit Test fault message, or HVAC Door Recalibration fault
message is displayed, proceed to the conclusion question.
NOTE: If multiple codes appear, diagnose those that relate to a short circuit
first.
Start the engine.
Press the A/C - Heater Control power switch on.
Turn the mode select control to the panel position.
Verify that the front blower motor and, if equipped, rear blower motor operates
correctly in all speeds from each control. Diagnose and repair all blower related faults
before proceeding with this test.
Turn the front blower motor control to the high speed position.
NOTE: Before actuating the AC Cooldown Test, verify that the A/C compres-
sor is not running. If the compressor is running, turn the A/C off and allow
the evaporator to warm up before proceeding with the test.
With the DRBIII
t in HVAC, System Tests, actuate the AC Cooldown Test.
Turn the front blower motor control to the low speed position.
If equipped, turn the rear blower motor control to the rear position.
Set the passenger blend control to the full cold position.
If equipped, set the zone/driver blend control to the full cold position.
If equipped, on the Rear Blower Rear Control, set the rear blend/mode control to the
full cold position.
Monitor the DRBIII
t for active HVAC DTCs while performing the following test
steps.
Turn the mode select control to the defrost position, wait 30 seconds, and then turn
it back to the panel position.
Press the recirculation mode switch on, wait 30 seconds, and then press it off.
Press the A/C mode switch on, wait 30 seconds, and then press it off.
Press the rear window defogger switch on, wait 30 seconds, and then press it off.
Move the passenger blend control from full cold to full hot, wait 30 seconds, and then
move it back to full cold.
If equipped, move the zone/driver blend control from full cold to full hot, wait 30
seconds, and then move it back to full cold.
If equipped, on the Rear Blower Rear Control, move the rear blend/mode control from
full cold to full hot, wait 30 seconds, and then move it back to full cold.
With the DRBIII
t in HVAC, System Tests, actuate the Actuator Circuit Test.
With the DRBIII
t in HVAC, System Tests, actuate the HVAC Door Recalibration
Test.
Does the DRBIII
t display any active HVAC DTC(s) or System Tests fault message(s)?
All
Yes
→ Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ No problem found at this time.
Perform BODY VERIFICATION TEST - VER 1.
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A/C SWITCH FAULT (STORED) - MTC —
Continued
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