Dodge Ram. Manual — part 92
PCM COMMUNICATION FAILURE (STORED)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module does not receive the
message from the PCM for more than 5 seconds. This message provides Engine RPM and
Vehicle Speed.
RECIRC OVERCURRENT (STORED)
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)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the MAX on/off switch stays closed for 10 minutes.
REFRIGERANT PRESS RX FAILURE (STORED)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module does not receive the
Refrigerant Pressure message from the PCM for more than 20 seconds.
TX FAILURE (STORED)
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
PCI Bus message.
VIN RX FAILURE (STORED)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module does not receive the
VIN message from the PCM for more than 5 seconds.
ZONE OVERCURRENT (STORED)
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 Blend
(dual-zone) actuator. Only one overcurrent DTC can set per ignition cycle.
POSSIBLE CAUSES
CHECK FOR ACTIVE HVAC DTCS AND SYSTEM TEST FAULT MESSAGES
STORED CODE(S) TEST COMPLETE
365
HEATING & A/C
A/C SWITCH FAULT (STORED) —
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 Door Recalibration fault message is
displayed, proceed to the conclusion question.
Turn the ignition on.
Turn the mode select control to the panel position.
Verify that the blower motor operates correctly in all speeds. Diagnose and repair all
blower related faults before proceeding with this test.
For vehicles that are not equipped with A/C, skip the next 6 steps of this procedure.
Turn the blower control to the low speed position.
Make sure that the A/C switch is turned off (status indicator not illuminated).
Turn the blower control to the off position.
Start the engine.
Turn the blower control to the high speed 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 A/C
system operation.
With the DRBIII
t in HVAC, System Tests, actuate the AC Cooldown Test. Allow one
minute for test to complete.
If not done previously, start the engine.
Turn the blower control to the low speed position.
Set the blend/driver blend (dual-zone) control to the full cold position.
If equipped, set the passenger blend control to the full cold position.
Monitor the DRBIII
t for active HVAC DTCs during the following test steps.
If equipped, press the A/C switch on, wait 30 seconds, and then press it off.
On Dual-Zone systems, press the MAX switch on, wait 30 seconds, and then press it
off.
If equipped, press the EBL switch on, wait 30 seconds, and then press it off.
Move the blend/driver blend (dual-zone) control from full cold to full hot, wait 30
seconds, and then move it back to full cold.
If equipped, move the passenger blend control from full cold to full hot, wait 30
seconds, and then moved it back to full cold.
Turn the mode select control to the defrost position, wait 30 seconds, and then turn
it to the panel position (dual-zone) or MAX panel position (single-zone).
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 HVAC DTCs or System Test fault messages?
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.
366
HEATING & A/C
A/C SWITCH FAULT (STORED) —
Continued
Symptom List:
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE
BLEND CIRCUIT SHORTED TO GROUND
BLEND CIRCUIT SHORTED TO IGN OR BATT
COMMON DRIVER SHORTED TO GROUND
COMMON DRIVER SHORTED TO IGN OR BATT
MODE 1 CIRCUIT SHORTED TO GROUND
MODE 1 CIRCUIT SHORTED TO IGN OR BATT
MODE 2 CIRCUIT SHORTED TO GROUND
MODE 2 CIRCUIT SHORTED TO IGN OR BATT
RECIRC CIRCUIT SHORTED TO GROUND
RECIRC CIRCUIT SHORTED TO IGN OR BATT
SHORT TOO COMPLEX
ZONE CIRCUIT SHORTED TO GROUND
ZONE CIRCUIT SHORTED TO IGN OR BATT
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be ACT CKT TEST PASSED, OVER-
CURRENT DTCS ACTIVE.
When Monitored and Set Condition:
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
If two or more drivelines shorted together.
BLEND CIRCUIT SHORTED TO GROUND
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Blend Door Driver circuit (single-zone) or the Passenger Blend Door Driver circuit
(dual-zone).
BLEND CIRCUIT SHORTED TO IGN OR BATT
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Blend Door Driver circuit (single-zone) or the Passenger Blend Door Driver circuit
(dual-zone).
COMMON DRIVER SHORTED TO GROUND
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Common Door Driver circuit.
367
HEATING & A/C
COMMON DRIVER SHORTED TO IGN OR BATT
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Common Door Driver circuit.
MODE 1 CIRCUIT SHORTED TO GROUND
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Mode Door 1 Driver circuit.
MODE 1 CIRCUIT SHORTED TO IGN OR BATT
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Mode Door 1 Driver circuit.
MODE 2 CIRCUIT SHORTED TO GROUND
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Mode Door 2 Driver circuit.
MODE 2 CIRCUIT SHORTED TO IGN OR BATT
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Mode Door 2 Driver circuit.
RECIRC CIRCUIT SHORTED TO GROUND
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short low on the
Recirculation Door Driver circuit.
RECIRC CIRCUIT SHORTED TO IGN OR BATT
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects a short high on
the Recirculation Door Driver circuit.
SHORT TOO COMPLEX
When Monitored:
When the Actuator Circuit Test is executed.
Set Condition:
This message will set if the A/C - Heater Control detects more than three
drivers being shorted in the same direction (for example, four drivers, all shorted to
ground) or if two or more drivers are shorted with at least one driver shorted to
ignition/battery and one driver shorted to ground.
368
HEATING & A/C
ACT CKT TEST PASSED, OVERCURRENT DTCS ACTIVE —
Continued
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