Diagnostic Aids
WARNING: This page is about a different car, the 2003 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
- After confirming DTCs P0100, P0102 or P0103, use hand-held tester to check mass air flow ratio from the "DIAGNOSIS/ENHANCED OBD-II/DATA LIST/ALL DATA/MAF". See MASS AIR FLOW RATIO table.
- Read freeze frame data using hand-held tester or OBD-II scan tool, as freeze frame data records engine conditions when a malfunction is detected. When troubleshooting, it is useful to determine whether vehicle was running or stopped, engine was warmed up or not, air-fuel ratio was lean or rich, etc. at time of malfunction.
MASS AIR FLOW RATIO
| Air Flow Value (g/s) | Malfunction |
|---|---|
| Approximately 0 | Mass Air Flow Meter Power Source Circuit Open Or VG Circuit Open Or Short |
| 160 Or More | E2G Circuit Open |