Chrysler Pacifica. Manual — part 133
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.
RECIRC OVERCURRENT (STORED) - MTC
When Monitored:
When actuator movement is requested.
Set Condition:
This DTC will set if the A/C Heater Control 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 mode switch stays closed for 10 minutes.
TX FAILURE (STORED) - MTC
When Monitored:
When the ignition is on.
Set Condition:
This DTC will set if the A/C Heater Control is unable to broadcast 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 does not receive the Vehicle
Odometer message from the Body Control Module (BCM) 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 detects an excessive current
draw on any of the door driver circuits while attempting to drive the driver blend door
actuator. Only one overcurrent DTC can set per ignition cycle.
POSSIBLE CAUSES
CHECK FOR ACTIVE HVAC DTCS AND SYSTEM TESTS FAULT MESSAGES
OLD DTC OR INTERMITTENT WIRING PROBLEM
529
HEATING & A/C
A/C SWITCH FAULT (STORED) - MTC —
Continued
TEST
ACTION
APPLICABILITY
1
NOTE: Active DTCs must be resolved before diagnosing stored DTCs.
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 DTCs are displayed, diagnose those that relate to a short
circuit first.
Start the engine.
Press the A/C Heater Control’s power switch on.
Turn the mode select control to the panel position.
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: 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.
NOTE: Running the Cooldown test will cause the A/C status indicator to
flash. The indicator will stop flashing if either the test passes, if any button
on the control is pressed, or the ignition is cycled and the odometer shows
greater than 8 miles.
NOTE: Messages will display on the DRBIII
t after running the AC Cooldown
test. These messages will clear after paging back out of this test function.
Therefore, it is important to note all messages before doing so.
Verify that the blower motor operates correctly in all speeds. Diagnose and repair all
blower related faults before proceeding with this test.
Turn the blower motor control to the high speed position.
With the DRBIII
t in HVAC, System Tests, actuate the AC Cooldown Test. If any
Cooldown Test fault messages appear, proceed to the conclusion question. Otherwise,
proceed as follows:
Turn the blower motor control to the low speed position.
Set the passenger blend control to the full cold position.
Set the driver blend 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.
Move the driver blend 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 Heating & A/C symptom list and choose the
symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ DTC may not have been erased after a repair. If possible, verify
recent service. Otherwise, inspect related wiring for chafed,
pierced, pinched, & partially broken wires & connectors for
broken, bent, pushed out, & corroded terminals. Repair as neces-
sary.
Perform BODY VERIFICATION TEST - VER 1.
530
HEATING & A/C
A/C SWITCH FAULT (STORED) - MTC —
Continued
Symptom List:
AC PRESSURE SENSOR FAULT (ACTIVE) - ATC
AC PRESSURE TOO HIGH - ATC
AC PRESSURE TOO LOW - ATC
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be AC PRESSURE SENSOR FAULT
(ACTIVE) - ATC.
When Monitored and Set Condition:
AC PRESSURE SENSOR FAULT (ACTIVE) - ATC
When Monitored:
With the engine running and the A/C Relay energized.
Set Condition:
This DTC will set if the A/C pressure sensor signal voltage at the
Powertrain Control Module (PCM) goes below 0.58 volts for 2.6 seconds or above 4.92 volts.
AC PRESSURE TOO HIGH - ATC
When Monitored:
When executing the AC Cooldown Test.
Set Condition:
If the A/C Pressure Sensor value is above 300 psi.
AC PRESSURE TOO LOW - ATC
When Monitored:
When executing the AC Cooldown Test.
Set Condition:
If the A/C Pressure Sensor value is below 50 psi.
POSSIBLE CAUSES
POWERTRAIN CONTROL MODULE (PCM) DTC(S) PRESENT
IMPROPER REFRIGERANT SYSTEM CHARGE
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read PCM DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to the Powertrain Diagnostic Information for the related
symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
531
HEATING & A/C
TEST
ACTION
APPLICABILITY
2
Verify that the refrigerant system is properly charged in accordance with the Service
Information.
Is the refrigerant system properly charged?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Recharge the refrigerant system in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
532
HEATING & A/C
AC PRESSURE SENSOR FAULT (ACTIVE) - ATC —
Continued
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