Dodge Ram. Manual — part 98
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
→ Go To 2
2
Turn the ignition on.
With the DRBIII
t, check the PCM for any DTCs.
Are any DTCs present?
All
Yes
→ Refer to the Powertrain Diagnostic Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition on.
With the DRB in HVAC, Monitor Display, PCI Bus Msgs, look for the applicable
message and displayed value (
9A/C Hi Side Press: XX,9 9Veh Spd: XX,9 9Eng RPM:
XX,
9 9Coolant Temp: XX,9 9Batt Volts: XX,9 9Batt Temp: XX,9 9VIN Msg Pres: YES9).
Does the DRB display NO RESPONSE after the applicable message?
All
Yes
→ Refer to symptom *No Response From PCM (PCI Bus) in the
Communication category.
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.
389
HEATING & A/C
ENGINE GAUGE RX FAILURE (ACTIVE) —
Continued
Symptom:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE)
When Monitored and Set Condition:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module sees voltage above
4.9 volts on the Evaporator Temperature Sensor Signal circuit.
POSSIBLE CAUSES
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED HIGH
EVAPORATOR TEMPERATURE SENSOR
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Turn the ignition on.
Measure the voltage between the Evaporator Temperature Sensor Signal circuit and
ground.
Is there any voltage present?
All
Yes
→ Repair the Evaporator Temperature Sensor Signal circuit for a
short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
NOTE: Ensure that the A/C - Heater Control Module C1 harness connector is
connected to the A/C - Heater Control Module.
Disconnect the Evaporator Temperature Sensor harness connector.
Connect a jumper wire between the Evaporator Temperature Sensor Signal circuit
and the Sensor Ground circuit at the Evaporator Temperature Sensor harness
connector.
Turn the ignition on.
With the DRBIII
t in Sensor Display, read the Evaporator Temperature Sensor
voltage.
Is the voltage below 0.10 volt?
All
Yes
→ Replace the Evaporator Temperature Sensor in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
390
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Disconnect the Evaporator Temperature Sensor harness connector.
Measure the resistance of the Evaporator Temperature Sensor Signal circuit between
the A/C - Heater Control Module C1 harness connector and the Evaporator Temper-
ature Sensor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the Evaporator Temperature Sensor Signal circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Disconnect the Evaporator Temperature Sensor harness connector.
Measure the resistance of the Sensor Ground circuit between the A/C - Heater
Control Module C1 harness connector and the Evaporator Temperature Sensor
harness connector.
Is the resistance below 5.0 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 Sensor Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
391
HEATING & A/C
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE) —
Continued
Symptom:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORTED (AC-
TIVE)
When Monitored and Set Condition:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORTED (ACTIVE)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module sees voltage below
0.06 volts on the Evaporator Temperature Sensor Signal circuit.
POSSIBLE CAUSES
EVAPORATOR TEMPERATURE SENSOR
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
CIRCUIT
A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Evaporator Temperature Sensor harness connector.
Turn the ignition on.
With the DRBIII
t in Sensor Display, read the Evaporator Temperature Sensor
voltage.
Does the DRBIII
t display: 4.9 volts or greater?
All
Yes
→ Replace the Evaporator Temperature Sensor in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Disconnect the Evaporator Temperature Sensor harness connector.
Measure the resistance between ground and the Evaporator Temperature Sensor
Signal circuit.
Is the resistance above 10K ohms?
All
Yes
→ Go To 3
No
→ Repair the Evaporator Temperature Sensor Signal circuit for a
short to ground.
Perform BODY VERIFICATION TEST - VER 1.
392
HEATING & A/C
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