Dodge Dakota (R1). Manual — part 52
TEST
ACTION
APPLICABILITY
7
NOTE: Ensure the voltmeter leads meet the terminals in the connector and
that there is good terminal to wire connection.
NOTE: Ensure the voltmeter leads are connected for positive polarity
Back probe the Evaporator Temperature Sensor Signal circuit between the Evapo-
rator Temperature Sensor harness connector and the A/C - Heater Control Module C1
harness connector.
Turn the ignition on.
Is the voltage below 0.10 volt?
All
Yes
→
Replace the A/C - Heater Control Module in accordance with the
Service Information. After repair is complete, rerun the Cooldown
Test.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Repair the high resistance in the Evaporator Temperature Sensor
Signal circuit. After repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
205
HEATING & A/C
COOLDOWN TEST TOO COLD TO START —
Continued
Symptom List:
ENGINE GAUGE RX FAILURE (ACTIVE)
PCM COMMUNICATION FAILURE (ACTIVE)
REFRIGERANT PRESSURE RX FAILURE (ACTIVE)
VIN RX FAILURE (ACTIVE)
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be ENGINE GAUGE RX FAILURE
(ACTIVE).
When Monitored and Set Condition:
ENGINE GAUGE RX FAILURE (ACTIVE)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module does not receive any
one of the following messages from the PCM for more than 5 seconds: Battery Voltage,
Battery Temperature, Engine Coolant Temperature.
PCM COMMUNICATION FAILURE (ACTIVE)
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module does not receive any
one of the following messages from the PCM for more than 8 seconds: Engine RPM, Vehicle
Speed.
REFRIGERANT PRESSURE RX FAILURE (ACTIVE)
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.
VIN RX FAILURE (ACTIVE)
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.
POSSIBLE CAUSES
CHECK FOR ADDITIONAL HVAC DTCS
CHECK FOR PCM DTCS
A/C - HEATER CONTROL MODULE
PCM - NO MESSAGE TO A/C - HEATER CONTROL MODULE
206
HEATING & A/C
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
→
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
→
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
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
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.
207
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 Evaporator Temperature Sensor/sensor circuit is
open.
POSSIBLE CAUSES
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 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.
Does the DRBIII
t display: 0.0 volts?
All
Yes
→
Replace the Evaporator Temperature Sensor in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→
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 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
→
No
→
Repair the Evaporator Temperature Sensor Signal circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
208
HEATING & A/C
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