Test Description

Number(s) below refer to step number(s) on Diagnostic Table.

1. 1. The On-Board Diagnostic (OBD II) System Check prompts technician to complete some basic checks and store freeze frame and failure records data on scan tool if applicable. This creates an electronic copy of data taken when malfunction occurred. The information is then stored on scan tool for later reference.
2. 4. This step checks to see if O2S1 PE; operating properly.
3. 6. If no faults have been found at this point and no additional DTCs were set, refer to "Diagnostic Aids" for additional checks and information.

Fig 1: DTC P1171: Fuel Trim System Lean During Power Enrich

Courtesy of DAEWOO