Dodge Ram 2004 Service Manual page 403

ENGINE GAUGE RX FAILURE (ACTIVE) —
TEST
1 Turn the ignition on.
With the DRBIII , read HVAC DTCs.
Does the DRBIII display additional HVAC DTCs?
Yes → Return to the symptom list and choose the symptom(s).
→ Go To 2
No
2 Turn the ignition on.
With the DRBIII , check the PCM for any DTCs.
Are any DTCs present?
Yes → Refer to the Powertrain Diagnostic Information.
→ Go To 3
No
3 Turn the ignition on.
With the DRB in HVAC, Monitor Display, PCI Bus Msgs, look for the applicable
message and displayed value ( A/C Hi Side Press: XX, Veh Spd: XX, Eng RPM:
XX, Coolant Temp: XX, Batt Volts: XX, Batt Temp: XX, VIN Msg Pres: YES ).
Does the DRB display NO RESPONSE after the applicable message?
Yes → Refer to symptom *No Response From PCM (PCI Bus) in the
→ Replace the A/C - Heater Control Module in accordance with the
No
ACTION
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
Communication category.
Perform BODY VERIFICATION TEST - VER 1.
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Continued
389
HEATING & A/C
APPLICABILITY
All
All
All