Chrysler Voyager. Manual — part 277

TEST

ACTION

APPLICABILITY

2

CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
system operation.
Turn the ignition on.
With the DRBIII

t, check the PCM/ECM for DTCs.

Are any DTCs present?

All

Yes

→ Refer to Powertrain Diagnostic information for the related symp-

tom(s).
After repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Refer to the Service Information for additional Cooldown Test

related diagnostic information and testing procedures.
After repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.

535

HEATING & A/C

COOLDOWN TEST SENSOR FAILURE - MTC —

Continued

Symptom:

COOLDOWN TEST TOO COLD TO START - MTC

When Monitored and Set Condition:

COOLDOWN TEST TOO COLD TO START - MTC

When Monitored:

When executing the Cooldown Test.

Set Condition:

This message will be displayed if the A/C - Heater Control Module sees

evaporator temperature below 12.7°C (55°F) when executing the Cooldown Test.

POSSIBLE CAUSES

EVAPORATOR TEMPERATURE TOO LOW

HVAC DTC(S) PRESENT

CHECK THE PCM/ECM FOR DTCS

EVAPORATOR TEMPERATURE SENSOR

SENSOR GROUND CIRCUIT HIGH RESISTANCE

EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT HIGH RESISTANCE

A/C - HEATER CONTROL MODULE

TEST

ACTION

APPLICABILITY

1

CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
system operation.
Start the engine.
Turn the A/C off.
Turn the Blower on high. Allow the blower to run for 5 minutes to ensure that the
Evaporator Temperature Sensor temperature is above 12.7°C (55°F).
With the DRBIII

t, actuate the Cooldown Test.

Does the DRBIII

t display: Cooldown Test Too Cold To Start?

All

Yes

→ Go To 2

No

→ Perform additional testing as necessary.

Perform BODY VERIFICATION TEST - VER 1.

2

CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
system operation.
Turn the ignition on.
With the DRBIII

t, read HVAC DTCs.

Does the DRBIII

t display any HVAC DTCs?

All

Yes

→ Return to the symptom list and choose the symptom(s). After the

repair is complete, with the DRBIII

t, erase the DTC(s). Cycle the

ignition switch. With the DRBIII

t, actuate the Cooldown Test.

Perform BODY VERIFICATION TEST - VER 1.

No

→ Go To 3

536

HEATING & A/C

TEST

ACTION

APPLICABILITY

3

CAUTION: The evaporator temperature must be above 12.7°C (55°F) and the
work area ambient temperature must be above 21.1°C (70°F) to test A/C
system operation.
Turn the ignition on.
With the DRBIII

t, check the PCM/ECM for DTCs.

Are any DTCs present?

All

Yes

→ Refer to Powertrain Diagnostic information for the related symp-

tom(s). After the repair is complete, with the DRBIII

t, erase the

DTC(s). Cycle the ignition switch. With the DRBIII

t, actuate the

Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Go To 4

4

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.
Is the voltage above 4.9 volts?

All

Yes

→ Go To 5

No

→ Go To 6

5

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.
Is the voltage 0.0 volts?

All

Yes

→ Replace the Evaporator Temperature Sensor in accordance with

the Service Information. After repair is complete, rerun the
Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.

No

→ Go To 6

6

NOTE: Ensure that the Evaporator Temperature Sensor harness connector
is connected to the Evaporator Temperature Sensor.
NOTE: Ensure that 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 Sensor Ground circuit between the Evaporator 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

→ Go To 7

No

→ Repair the high resistance in the Sensor Ground circuit. After

repair is complete, rerun the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.

537

HEATING & A/C

COOLDOWN TEST TOO COLD TO START - MTC —

Continued

TEST

ACTION

APPLICABILITY

7

NOTE: Ensure that the Evaporator Temperature Sensor harness connector
is connected to the Evaporator Temperature Sensor.
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.

538

HEATING & A/C

COOLDOWN TEST TOO COLD TO START - MTC —

Continued