Chrysler PT Cruiser 2001 Service Manual Supplement page 2544

DRIVEABILITY - GAS
Symptom:
P0141-1/2 O2 SENSOR HEATER FAILURE
When Monitored and Set Condition:
P0141-1/2 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 GROUND CIRCUIT OPEN
WIRING HARNESS INTERMITTENT PROBLEM
O2S
PCM
TEST
1 Turn the 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 6
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
3 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance of the O2S Heater Ground circuit to ground at the O2 Sensor
harness connector.
Is the resistance below 5.0 ohms?
Yes → Go To 4
→ Repair the O2 Sensor Heater Ground circuit for an open.
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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APPLICABILITY
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All
All