Component Inspection

P0140 O2 Sensor Circuit No Activity Detected (Sensor 2)

Inspection/Repair - Component Inspection

Component Inspection

1. Visual Inspection
(1) IG "OFF"
(2) Disconnect HO2S (B1/S2) connector.
(3) Check that HO2S (B1S2) is contaminated or damaged by foreign materials.
(4) Has a problem been found?
YES
1) Go to "Check ECM" as follows.
NO
1) Substitute with a known - good HO2S (B1/S2) and check for proper operation.
If the problem is corrected, replace HO2S (B1/S2) and go to "Verification of Vehicle Repair" procedure.
2. Check ECM
(1) IG "OFF" and disconnect B1S2 connector.
(2) Connect scantool and Key "ON".
(3) Select simulation function on scantool.
(4) Simulate voltage at terminal 2 of HO2S (B1/S2) signal connector.




(5) Does the signal value of HO2S (B1/S2) change according to simulation voltage?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion,contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO
1) Substitute with a known - good ECM and check for proper operation.
If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure.

CAUTION:
There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM.
Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others