TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Turn the ignition on.
Connect a test light to battery voltage, probe the O2 Sensor Signal circuit in the O2
Sensor harness connector.
With the DRBIII
t, read the O2 Sensor voltage.
Is the voltage above 1.0 volts?
All
Yes
→ Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the O2 Sensor harness connector
Disconnect the PCM harness connector.
Measure the resistance of the O2 Sensor ground circuit between the O2 Sensor
harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the O2 Sensor ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4
Turn the ignition off.
Disconnect the O2 Sensor harness connector
Disconnect the PCM harness connector.
Measure the resistance of the O2 Sensor Signal circuit between the O2 Sensor
harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 5
No
→ Repair the O2 Sensor Signal for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
5
NOTE: Ensure the voltmeter leads meet the terminals in the connector and
that there is good terminal to wire connection.
NOTE: Ensure the voltmeter leads are connected for positive polarity
Perform a voltage drop test by back probing between the O2 Sensor ground circuit at
the O2 Sensor harness connector and PCM harness connector.
Start the engine.
Allow the engine to idle.
Is the voltage below 0.10 volt?
All
Yes
→ Go To 6
No
→ Repair the high resistance on the O2 Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
71
DRIVEABILITY - SBEC
P0134-1/1 O2 SENSOR STAYS AT CENTER —
Continued