Chrysler PT Cruiser. Manual — part 296
TEST
ACTION
APPLICABILITY
2
NOTE: Visually inspect both the component and the PCM connectors. Look
for damage, partially broken wires and backed out or corroded terminals
Turn the ignition off.
Disconnect the Ambient Air Temp Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the (K145) AAT Signal circuit in the Ambient Air Temperature
Sensor harness connector.
Is the voltage above 5.2 volts?
All
Yes
→ Repair the short to battery voltage in the (K145) AAT Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIII
t, read the Ambient Air Temperature Sensor voltage.
Is the voltage above 4.9 volts?
All
Yes
→ Go To 4
No
→ Go To 7
4
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Using a jumper wire, jumper across the Ambient Air Temperature Sensor harness
connector.
Ignition on, engine not running.
With the DRBIII
t, read the Ambient Air Temperature voltage.
Is the voltage below 0.1 volt?
All
Yes
→ Replace the Ambient Air Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K145) AAT Signal circuit from the Ambient Air
Temperature Sensor harness connector to the appropriate terminal of special tool
#8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the open in the (K145) AAT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
274
DRIVEABILITY - NGC
P0071-AMBIENT TEMP SENSOR PERFORMANCE —
Continued
TEST
ACTION
APPLICABILITY
6
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K167) Sensor ground circuit from the Ambient Air
Temperature Sensor harness connector to the appropriate terminal of special tool
#8815.
Is the resistance below 5.0 ohms?
All
Yes
→ NOTE: Before continuing, check the PCM harness connector
terminals for corrosion, damage, or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Repair the open in the (K167) Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K145) AAT Signal circuit.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K145) AAT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 8
8
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the (K145) AAT Signal circuit and the (K167) Sensor
ground circuit in the Ambient Air Temperature Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the (K167) Sensor ground shorted to the (K145) AAT
Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ NOTE: Before continuing, check the PCM harness connector
terminals for corrosion, damage or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
275
DRIVEABILITY - NGC
P0071-AMBIENT TEMP SENSOR PERFORMANCE —
Continued
Symptom:
P0072-AMBIENT TEMP SENSOR LOW
When Monitored and Set Condition:
P0072-AMBIENT TEMP SENSOR LOW
When Monitored:
The ignition key on.
Set Condition:
Ambient Temperature Sensor is less than .04 of a volt at the PCM. One
Trip Fault.
POSSIBLE CAUSES
AMBIENT AIR TEMPERATURE SENSOR VOLTAGE BELOW .04 VOLTS
AMBIENT AIR TEMPERATURE SENSOR INTERNAL FAILURE
(K145) AAT SIGNAL CIRCUIT SHORTED TO GROUND
(K145) AAT SIGNAL CIRCUIT SHORTED TO (K167) SENSOR GROUND CIRCUIT
PCM
TEST
ACTION
APPLICABILITY
1
NOTE: After repairing this DTC, the AAT sensor value will not refresh until
either the ignition is OFF for more than 5 hours or the vehicle has been
driven at a speed greater than 20 MPH for more than 2 minutes.
Ignition on, engine not running.
With the DRBIII
t, read the Ambient Air Temperature Sensor voltage.
Is the voltage below .04 of a volt?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
2
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIII
t, read Ambient Air Temperature Sensor voltage.
Is the voltage between 4.8 and 5.2 volts?
All
Yes
→ Replace the Ambient Air Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 3
276
DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K145) AAT Signal circuit in the
Ambient Air Temperature Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K145) AAT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Ambient Air Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the (K145) AAT Signal circuit and the (K167) Sensor
ground circuit in the Ambient Air Temperature Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the (K167) Sensor ground shorted to the (K145) AAT
Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
277
DRIVEABILITY - NGC
P0072-AMBIENT TEMP SENSOR LOW —
Continued
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