TEST ACTION APPLICABILITY
3 CAUTION: 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 DRBIIIt, check the PCM for any DTCs.
Are any DTCs present?
All
Yes → Refer to the Powertrain Diagnostic Information. After the repair
is complete, with the DRBIIIt, erase the DTC(s). Cycle the
ignition switch. Start the engine. Set the blower control to high
speed. With the DRBIIIt, 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 DRBIIIt 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 DRBIIIt in Sensor Display, read the Evaporator Temperature Sensor
voltage.
Is the voltage below 0.10 volt?
All
Yes → Replace the Evaporator Temperature Sensor in accordance with
the Service Information. After the repair is complete, start the
engine. Set the blower control to high speed. With the DRBIIIt,
actuate 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 the
repair is complete, start the engine. Set the blower control to high
speed. With the DRBIIIt, actuate the Cooldown Test.
Perform BODY VERIFICATION TEST - VER 1.
385
HEATING & A/C
COOLDOWN TEST TOO COLD TO START — Continued
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