P1197

Tests 1 - 5:

Tests 6 - 11:

Tests 12 - 13:

SYMPTOM
P1197 - 1/2 02 SENSOR SLOW DURING CATALYST MONITOR

TEST NOTE
This symptom is diagnosed using the test P1195 - 1/1 02 SENSOR SLOW DURING CATALYST MONITOR.

WHEN MONITORED
With the engine running, coolant greater than 170 °F, open throttle, steady to slightly increasing vehicle speed greater than 18 mph but less than 55 mph, with a light load on the engine, for a period no less than 5 minutes.

SET CONDITION
The oxygen sensor signal voltage is switching from below 0.39 volt to above 0.6 volts and back fewer times than required.

POSSIBLE CAUSES
- Excessive engine blowby
- Exhaust leak
- O2 sensor heater feed circuit open
- O2 sensor heater ground circuit open
- O2 sensor sensor ground circuit voltage drop
- O2 sensor signal circuit voltage drop
- Wiring harness intermittent problem
- O2 sensor