Dodge Ram Truck 1500-2500-3500. Manual — part 2029
REFRIGERANT PRESSURE RX FAILURE (CONTINUED)
3.
VERIFY THAT THE PCM OR ECM IS BROADCASTING THE MESSAGE ON THE PCI BUS
With the DRBIII
T
in HVAC, select Monitor Display and then select PCI Bus Messages.
From the list, select Refrigerant Pressure.
Does the DRBIII
T
display NO RESPONSE after this message?
Yes (Gasoline Engines)
Perform the *No Response From PCM (PCI Bus) diagnostic procedure. (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING).
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
Yes (Diesel Engines)
Perform the *No Response From ECM (PCI Bus) diagnostic procedure. (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING).
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
SHORT TOO COMPLEX
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
When the Actuator Circuit Test is executed.
•
Set Condition:
If the A/C Heater Control detects more than three drivers shorted in the same direction (e.g. 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.
Possible Causes
DOOR DRIVER CIRCUIT(S) SHORTED TO GROUND
DOOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
DOOR DRIVER CIRCUITS SHORTED TOGETHER
DOOR ACTUATOR(S)
A/C HEATER CONTROL
For Single-Zone HVAC systems, refer to *ACTUATOR CIRCUIT TEST DIAGNOSTICS (SINGLE-ZONE) in this
Section for the diagnostic test procedure. For Dual-Zone HVAC systems, refer to *ACTUATOR CIRCUIT TEST
DIAGNOSTICS (DUAL-ZONE) in this Section for the diagnostic test procedure.
24 - 116
HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
TX FAILURE
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the A/C Heater Control is unable to broadcast a PCI Bus message.
Possible Causes
PCI BUS CIRCUIT FAULTS
A/C HEATER CONTROL
Diagnostic Test
1.
VERIFY THAT THE A/C HEATER CONTROL IS ACTIVE ON THE BUS
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?
Yes
>> Go To 2
No
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No
Response diagnostic procedures.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
2.
CHECK FOR ADDITIONAL DTCS IN THE A/C HEATER CONTROL
With the DRBIII
T
, read active HVAC DTCs.
Does the DRBIII
T
display any additional DTCs?
Yes
>> Diagnose and repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of
HVAC related symptoms.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 3
3.
VERIFY THAT THE PCM OR ECM & CLUSTER ARE ACTIVE ON THE BUS
With the DRBIII
T
, attempt to communicate with the PCM (for gasoline engines) or the ECM (for diesel engines) and
the Cluster.
Was the DRBIII
T
able to I/D or communicate with these modules?
Yes
>> Go To 4
No
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No
Response diagnostic procedures.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
DR/DH
HVAC - ELECTRICAL DIAGNOSTICS
24 - 117
TX FAILURE (CONTINUED)
4.
VERIFY THE TX FAILURE DTC IS ACTIVE
With the DRBIII
T
, erase HVAC DTCs.
Cycle the ignition switch and wait approximately one minute.
With the DRBIII
T
, read active HVAC DTCs.
Does the DRBIII
T
display: TX Failure?
Yes
>> Replace the A/C Heater Control in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> A technician may not have erased this DTC following a module or PCI Bus repair. If possible, verify if
the vehicle was recently in for this type of service. Otherwise, visually inspect the related wiring harness
for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken,
bent, pushed out, and corroded terminals. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
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HVAC - ELECTRICAL DIAGNOSTICS
DR/DH
VIN RX FAILURE
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The Powertrain Control Module (PCM) (for gasoline engines) or Engine Control Module (ECM) (for diesel
engines) broadcasts a message on the PCI Bus that provides the VIN. This DTC will set if the A/C Heater
Control does not receive this message for more than 5 seconds.
Possible Causes
FAULTS PRESENT IN THE POWERTRAIN SYSTEM
PCM NOT BROADCASTING MESSAGE
ECM NOT BROADCASTING MESSAGE
A/C HEATER CONTROL NOT RECEIVING MESSAGE
Diagnostic Test
1.
VERIFY THAT THE VIN RX FAILURE DTC IS ACTIVE
Turn the ignition on.
With the DRBIII
T
, erase HVAC DTCs.
Cycle the ignition switch and wait approximately 30 seconds.
With the DRBIII
T
, read active HVAC DTCs.
Does the DRBIII
T
display: VIN RX Failure?
Yes
>> Go To 2
No
>> A technician may not have erased this DTC following a module or PCI Bus repair. If possible, verify if
the vehicle was recently in for this type of service. Otherwise, visually inspect the related wiring harness
for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken,
bent, pushed out, and corroded terminals. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
2.
CHECK FOR DTCS IN THE PCM OR ECM
With the DRBIII
T
, read PCM or ECM DTCs.
Does the DRBIII
T
display any DTCs?
Yes (Gasoline Engines)
Diagnose and repair the DTC(s). (Refer to 9 - ENGINE ELECTRICAL DIAGNOSTICS).
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
Yes (Diesel Engines)
Diagnose and repair the DTC(s). (Refer to 9 - ENGINE ELECTRICAL DIAGNOSTICS).
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING).
No
>> Go To 3
DR/DH
HVAC - ELECTRICAL DIAGNOSTICS
24 - 119
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