Chrysler PT Cruiser 2001 Service Manual Supplement page 2609

Symptom:
P1193-INLET AIR TEMP SENSOR VOLTAGE HIGH
When Monitored and Set Condition:
P1193-INLET AIR TEMP SENSOR VOLTAGE HIGH
When Monitored: With the ignition on and the engine running.
Set Condition: The inlet air temperature sensor voltage at the PCM goes above 4.9 volts.
SENSOR GROUND CIRCUIT OPEN
IAT SENSOR SIGNAL CIRCUIT OPEN
IAT SENSOR
IAT SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
POWERTRAIN CONTROL MODULE
WIRING HARNESS INTERMITTENT
TEST
1 Turn the ignition on.
With the DRB, read the PCM DTCs.
Is the Good Trip Counter for P1193 displayed and equal to zero?
Yes → Go To 2
→ Go To 7
No
2 Turn the ignition off.
Disconnect the IAT Sensor harness connector.
Start the engine and allow it to idle.
Measure the voltage of the IAT Sensor Signal circuit.
Is the voltage above 5.5 volts?
Yes → Repair the IAT Sensor Signal circuit for a short to voltage.
→ Go To 3
No
3 Turn the ignition off.
Disconnect the IAT Sensor harness connector.
Turn the ignition on.
With the DRB, monitor the INLET AIR TMP VLT value.
Connect a jumper wire between the IAT Sensor Signal circuit and the IAT Sensor
Ground circuit in the IAT Sensor harness connector.
Note: The voltage should change from greater than 4.5 volts to less than 1.0
volt.
Did the INLET AIR TMP VLT value change from greater than 4.5 volts to less than
1.0 volt?
Yes → Replace the IAT Sensor.
→ Go To 4
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
149
APPLICABILITY
All
All
All