J96 - Check Left/Front HO2S Circuit For Short to Power

NOTE: Due to the internal circuitry of the Powertrain Control Module (PCM), an intermittent left/front HO2S signal short to power could produce a continuous memory DTC 542 or 543.

- Key "OFF".

- Install breakout box, if applicable.

- Breakout box installed, PCM disconnected.

- Connect a test lamp between the left/front HO2S test pin and test pin 40 at the breakout box. H - Test Schematic

- Observe test lamp for an indication of a fault while performing the following (the light will turn on bright when a fault is detected):

- Shake. wiggle, bend the left/front HO2S circuit from the HO2S sensor to the PCM.

- Lightly tap the HO2S sensor (to simulate road shock).

- Is fault indicated?

Yes -- Isolate fault and service as necessary. Remove breakout box. Reconnect PCM. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Go to J97.