POSSIBLE CAUSES
INTERMITTENT CONDITION
PCM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the Good Trip counter for this DTC displayed and equal to zero?
All
No
→
Go To
3
Yes
→
Go To
2
2
Turn the ignition off.
NOTE: Wait a minimum of 8 minutes to allow the O2 Sensor to cool down
before continuing the test. Allow the O2 Sensor voltage to stabilize between
0.4 to 0.6 volts.
Turn the ignition on.
With the DRBIII
t, actuate the O2 Heater Test.
With the DRBIII
t, monitor O2 Sensor voltage for at least 2 minutes.
Does the voltage stay between 0.4 and 0.6 volt.
All
Yes
→
Go To
3
No
→
Go To
7
3
NOTE: Allow the O2 sensor to cool down to room temperature.
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element component side.
If this is a 2.5L is it between 4.0 and 5.0 ohms at 70° F(21° C)?
If this is a 3.9L or 5.9L is it between 3.3 and 4.1 ohms for before cat O2’s or between
4.0 and 5.0 ohms for after the cat O2’s at 70° F(21° C)?
If this is a 4.7L is it between 12.1 and 14.8 ohms at 70° F(21° C)?
All
Yes
→
Go To
4
No
→
Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance of the O2 Sensor Heater ground circuit in the O2 Sensor
harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Go To
5
No
→
Repair the O2 Sensor Heater ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
96
DRIVEABILITY - GAS
P0135-1/1 O2 SENSOR HEATER FAILURE —
Continued