FD94 - Check BOO Circuit Continuity

- Key "OFF".

- Release brake pedal.

- Disconnect Powertrain Control Module (PCM) 60 pin connector. Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Install breakout box, leave PCM disconnected.

- Connect Digital Volt/Ohm Meter (DVOM) between Brake On/Off (BOO) test pin 2 at the breakout box and stoplamp circuit at the stoplamp switch.

- DVOM on 200 ohm scale.

- Wiggle BOO circuit wires and connectors while observing DVOM.

- Is resistance ever greater than 5.0 ohms while wiggling?

Yes -- Isolate open in BOO circuit and service as necessary. Remove breakout box. Reconnect processor. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- For further diagnosis using the EEC-IV monitor box, go to Normal Scan Data Values. If an EEC-IV monitor box is not available, go to FD99. FD99 - Road Test