Chrysler Pacifica. Manual — part 146

Symptom:

EVAP TEMP SENSOR OPEN (ACTIVE) - ATC

When Monitored and Set Condition:

EVAP TEMP SENSOR OPEN (ACTIVE) - ATC

When Monitored:

With the ignition on and the IOD fuse installed.

Set Condition:

This DTC will set if the ATC detects an abnormally high voltage on the

evaporator temperature sensor signal ckt. Evap Temp Sensor Open is also displayed as a
AC Cooldown Test message if the ATC detects an abnormally high voltage on the
evaporator temperature sensor signal ckt during the AC Cooldown Test.

POSSIBLE CAUSES

EVAP TEMP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

EVAP TEMP SENSOR SIGNAL CIRCUIT SHORTED TO FRONT BLOWER MOTOR CONTROL CIR-
CUIT

EVAP TEMP SENSOR SIGNAL CIRCUIT SHORTED TO REAR BOOSTER FAN CONTROL CIRCUIT

AUTOMATIC TEMPERATURE CONTROL (ATC)

EVAP TEMP SENSOR SIGNAL CIRCUIT OPEN

SENSOR GROUND CIRCUIT OPEN

EVAPORATOR TEMPERATURE SENSOR

TEST

ACTION

APPLICABILITY

1

Turn the ignition off.
Disconnect the ATC C1 harness connector.
Turn the ignition on.
Measure the voltage of the Evaporator Temperature Sensor Signal circuit.
Is the voltage above 0.2 volts?

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 ATC C1 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Front Blower Motor Control circuit.
Is the resistance below 10K ohms?

All

Yes

→ Repair the Evaporator Temperature Sensor Signal circuit for a

short to the Front Blower Motor Control circuit.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Go To 3

581

HEATING & A/C

TEST

ACTION

APPLICABILITY

3

Turn the ignition off.
Disconnect the ATC C1 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Rear Booster Fan Control circuit.
Is the resistance below 10K ohms?

All

Yes

→ Repair the Evaporator Temperature Sensor Signal circuit for a

short to the Rear Booster Fan Control circuit.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Go To 4

4

Turn the ignition off.
Disconnect the ATC 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 Automatic Temperature Control (ATC) in accordance

with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Go To 5

5

Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Evaporator Temperature Sensor Signal circuit between
the ATC C1 harness connector and the in-line C202 harness connector (IP Side).
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 6

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 an open.
Perform BODY VERIFICATION TEST - VER 1.

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HEATING & A/C

EVAP TEMP SENSOR OPEN (ACTIVE) - ATC —

Continued

TEST

ACTION

APPLICABILITY

6

Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Sensor Ground circuit between the ATC C1 harness
connector and the in-line C202 harness connector (IP side).
Is the resistance below 5.0 ohms?

All

Yes

→ Check the wiring harness between the in-line C202 harness

connector (HVAC side) and the Evap Temp Sensor for an open.
Repair as necessary. If Ok, replace the Evaporator Temperature
Sensor.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Repair the Sensor Ground circuit between the ATC C1 harness

connector and the in-line C202 harness connector (IP side) for an
open.
Perform BODY VERIFICATION TEST - VER 1.

583

HEATING & A/C

EVAP TEMP SENSOR OPEN (ACTIVE) - ATC —

Continued

Symptom:

EVAP TEMP SENSOR SHORTED (ACTIVE) - ATC

When Monitored and Set Condition:

EVAP TEMP SENSOR SHORTED (ACTIVE) - ATC

When Monitored:

With the ignition on and the IOD fuse installed.

Set Condition:

This DTC will set if the ATC detects an abnormally low voltage on the

evaporator temperature sensor signal ckt. Evap Temp Sensor Shorted is also displayed as
a AC Cooldown Test message if the ATC detects an abnormally low voltage on the
evaporator temperature sensor signal ckt during the AC Cooldown Test.

POSSIBLE CAUSES

EVAPORATOR TEMPERATURE SENSOR

EVAP TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

EVAP TEMP SENSOR SIGNAL CIRCUIT SHORT TO SENSOR GROUND CIRCUIT

AUTOMATIC TEMPERATURE CONTROL (ATC)

TEST

ACTION

APPLICABILITY

1

Turn the ignition off.
Disconnect the in-line C202 harness connector.
Turn the ignition on.
With the DRBIII

t, read the active DTCs.

Does the DRBIII

t display: EVAP TEMP SENSOR OPEN?

All

Yes

→ Check the Evap Temp Sensor Signal circuit between the in-line

C202 harness connector (HVAC side) and the Evap Temp Sensor
for a short to ground. Repair as necessary. If Ok, replace the
Evaporator Temperature Sensor.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Go To 2

2

Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance between ground and the Evaporator Temperature Sensor
Signal circuit (IP side).
Is the resistance above 100k ohms?

All

Yes

→ Go To 3

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 ground.
Perform BODY VERIFICATION TEST - VER 1.

584

HEATING & A/C