TEST
ACTION
APPLICABILITY
2
Turn the ignition on.
With the DRBIII
t, actuate the O2 HEATER TEST.
Monitor the O2 Sensor voltage on the DRBIII
t. (O2S voltage should drop below 1.5
volts within 2-3 minutes)
Does the DRBIII
t O2 Sensor voltage drop below 1.5 volts within 2-3 minutes during
the O2 HEATER TEST
All
Yes
→
Go To
3
No
→
Go To
7
3
Start the engine and allow engine to idle.
Check for any exhaust leaks between the engine and the appropriate O2S.
Check for exhaust leaks between the engine and the appropriate downstream O2
Sensor.
Are there any exhaust leaks?
All
Yes
→
Repair or replace leaking exhaust parts as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Go To
4
4
Start engine. Allow the engine to reach normal operating temperature.
Check the exhaust for excessive smoke from internal oil or coolant leaks.
Is there an oil or coolant consumption condition present?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Go To
5
5
Turn the ignition off.
Using a Voltmeter, back probe the O2 Sensor Ground circuit between the O2 sensor
harness connector and the PCM harness connector. Connect Voltmeter for positive
polarity.
Start the engine. Allow the engine to reach normal operating temperature.
Is the voltage below 0.10 volt?
All
Yes
→
Go To
6
No
→
Repair high resistance on O2S Sensor Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Turn the ignition off.
Using a Voltmeter, back probe the O2 Sensor Signal circuit between the O2 Sensor
harness connector and PCM harness connector.
Start the engine. Allow the engine to reach normal operating temperature.
Is the voltage below 0.10 volt?
All
Yes
→
Go To
13
No
→
Repair high resistance on O2S Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
152
DRIVEABILITY - GAS
P1195-1/1 O2 SENSOR SLOW DURING CATALYST MONITOR —
Continued