Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 1  - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of the data taken when fault occurred. Information is then stored in scan tool for later reference.
2. 2  - This step verifies whether malfunction is presently occurring.
3. 3  - This step checks whether malfunction that caused DTC P0130 is still present. Operating vehicle in CHECK MODE enhances diagnostic capabilities of PCM. HO2S 1 diagnostic can be monitored on scan tool under I/M System Information selection. When HO2S test displays a YES status, indicating that heated oxygen sensor system diagnostic is completed, check for DTC P0130 in LAST TEST FAILED screen of scan tool. If there is no DTC P0130 displayed, HO2S diagnostic has run and passed, indicating that no malfunction was present this time. DTCs MUST be cleared to view CURRENT STATUS of system diagnostics being performed. Do not forget I/M System Information tests only indicate that the test has run, not whether the test passed or failed. LAST TEST FAILED screen must be checked for related DTCs to determine the outcome of the diagnostic test involved.
4. 4  - In this step DMM is used as a low current voltage source taking the place of HO2S. This step verifies whether PCM is able to receive and process a signal from HO2S 1.
5. 8  - A condition that affects fuel mixture or combustion event in the engine can impact the operation of HO2S. This can cause an accurate signal from HO2S to fail the diagnostic. Performing tests listed in DIAGNOSTIC AIDS  will eliminate a faulty running condition and prevent replacement of a good oxygen sensor.