Dodge Ram. Manual — part 99
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Evaporator Temperature Sensor harness connector.
Disconnect the A/C - Heater Control Module C1 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Sensor Ground circuit.
Is the resistance above 10K ohms?
All
Yes
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Evaporator Temperature Sensor Signal circuit for a
short to the Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
393
HEATING & A/C
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORTED (ACTIVE)
—
Continued
Symptom:
LOOPBACK TEST FAILURE (ACTIVE)
When Monitored and Set Condition:
LOOPBACK TEST FAILURE (ACTIVE)
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.
POSSIBLE CAUSES
CHECK FOR ADDITIONAL HVAC DTCS
A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read HVAC DTCs.
Does the DRBIII
t display additional HVAC DTCs?
All
Yes
→ Return to the symptom list and choose the symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
394
HEATING & A/C
Symptom:
TX FAILURE (ACTIVE)
When Monitored and Set Condition:
TX FAILURE (ACTIVE)
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.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE HVAC MODULE
CHECK FOR ADDITIONAL HVAC DTCS
ATTEMPT TO COMMUNICATE WITH THE PCM AND MIC
A/C - HEATER CONTROL MODULE
INTERMITTENT WIRING PROBLEM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the HVAC Module.
Was the DRBIII
t able to I/D or communicate with the HVAC Module?
All
Yes
→ Go To 2
No
→ Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition on.
With the DRBIII
t, read HVAC DTCs.
Does the DRBIII
t display additional 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
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the PCM.
With the DRBIII
t, attempt to communicate with the MIC.
Was the DRBIII
t able to I/D or communicate with the PCM and the MIC?
All
Yes
→ Go To 4
No
→ Refer to the Communication category for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
395
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition on.
With the DRBIII
t, erase HVAC DTCs.
Cycle the ignition switch and wait approximately 1 minute.
With the DRBIII
t, read HVAC DTC’s.
Did this DTC reset?
All
Yes
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors to help isolate a possible intermittent
wiring condition.
Perform BODY VERIFICATION TEST - VER 1.
396
HEATING & A/C
TX FAILURE (ACTIVE) —
Continued
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