Dodge Dakota (R1). Manual — part 53
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 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.
209
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 Evaporator Temperature Sensor/sensor circuit is
shorted low.
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
→
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
→
No
→
Repair the Evaporator Temperature Sensor Signal circuit for a
short to ground.
Perform BODY VERIFICATION TEST - VER 1.
210
HEATING & A/C
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.
211
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.
212
HEATING & A/C
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