Chrysler PT Cruiser 2001 Service Manual Supplement page 2539

Symptom List:
P0135-1/1 O2 SENSOR HEATER FAILURE
P1194-O2 HEATER PERFORMANCE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0135-1/1 O2 SENSOR HEATER
FAILURE.
When Monitored and Set Condition:
P0135-1/1 O2 SENSOR HEATER FAILURE
When Monitored: The O2 Heater Monitor runs during O2 sensor cool-down period, after
a hot drive cycle, when engine is shut down with the ignition key turned OFF .
Set Condition: Using O2 sensor signal voltage readings, during O2 sensor cool-down
period, with heater OFF compared to O2 sensor signal voltage with heater ON.
OPEN ASD RELAY OUTPUT CIRCUIT
O2S HEATER CONTROL CIRCUIT OPEN
O2S HEATER CONTROL CIRCUIT SHORTED TO GROUND
WIRING HARNESS INTERMITTENT PROBLEM
O2S
PCM
TEST
1 Turn Ignition On.
With the DRB, read the DTC's.
Is the Good Trip Counter displayed and equal to zero?
Yes → Go To 2
→ Go To 7
No
2 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Turn the ignition on.
With the DRB, actuate the O2 Heater Test.
Measure the voltage of the ASD Relay Output circuit at the O2 Sensor harness
connector.
Is the voltage above 11.0 volts?
Yes → Go To 3
→ Repair the ASD Relay Output circuit for an open.
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
79
APPLICABILITY
All
All