Chrysler Pacifica. Manual — part 147
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Sensor Ground circuit (IP side).
Is the resistance above 100k ohms?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Evaporator Temperature Sensor Signal circuit be-
tween the ATC C1 harness connector and the in-line C202
harness connector (IP side) for a short to Sensor Ground.
Perform BODY VERIFICATION TEST - VER 1.
585
HEATING & A/C
EVAP TEMP SENSOR SHORTED (ACTIVE) - ATC —
Continued
Symptom:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE)
- MTC
When Monitored and Set Condition:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C Heater Control senses abnormally high
voltage on the Evaporator Temperature Sensor Signal circuit.
POSSIBLE CAUSES
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED HIGH
A/C HEATER CONTROL
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
EVAPORATOR TEMPERATURE SENSOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the Evaporator Temperature Sensor Signal circuit.
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.
Disconnect the A/C Heater Control C1 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Sensor Ground circuit. The approximate circuit resistance should be:
1,468 ohms @ 40°C (104°F).
1,800 ohms @ 35°C (95°F).
2,221 ohms @ 30°C (86°F).
2,757 ohms @ 25°C (77°F).
3,443 ohms @ 20°C (68°F).
4,330 ohms @ 15°C (59°F).
5,485 ohms @ 10°C (50°F).
7,354 ohms @ 4°C (39°F).
8,130 ohms @ 2°C (36°F).
Is the resistance within the specifications?
All
Yes
→ Replace the A/C Heater Control in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
586
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Evaporator Temperature Sensor Signal circuit between
the A/C Heater Control C1 harness connector and the in-line C202 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the Evaporator Temperature Sensor Signal circuit be-
tween the A/C Heater Control C1 harness connector and the
in-line C202 harness connector (HVAC side) for an open.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Sensor Ground circuit between the A/C Heater Control
C1 harness connector and the in-line C202 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Check the wiring harness between the in-line C202 harness
connector (plenum side) and the Evaporator Temperature Sensor
for an open. Repair as necessary. If Ok, replace the Evaporator
Temperature Sensor in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Sensor Ground circuit between the A/C Heater Control
C1 harness connector and the in-line C202 harness connector
(HVAC side) for an open.
Perform BODY VERIFICATION TEST - VER 1.
587
HEATING & A/C
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE) -
MTC —
Continued
Symptom:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT (AC-
TIVE) - MTC
When Monitored and Set Condition:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT (ACTIVE) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C Heater Control senses abnormally low voltage
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 SHORT TO SENSOR GROUND CIR-
CUIT
A/C HEATER CONTROL
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the in-line C202 harness connector.
Turn the ignition on.
With the DRBIII
t in Sensor Display, read the Evaporator Temperature Sensor
voltage.
Does the DRBIII
t display: 5.0 volts or greater?
All
Yes
→ Check the Evap Temp Sensor Signal circuit between the in-line
C202 harness connector (plenum side) and the Evap Temp Sensor
for a short to ground. Repair as necessary. If Ok, replace the
Evaporator Temperature Sensor in accordance with the Service
Info.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance between ground and the Evaporator Temperature Sensor
Signal circuit (HVAC side).
Is the resistance above 10K ohms?
All
Yes
→ Go To 3
No
→ Repair the Evaporator Temperature Sensor Signal circuit be-
tween the A/C Heater Control C1 harness connector and the
in-line C202 harness connector (HVAC side) for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
588
HEATING & A/C
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