Signal Too Low. Intermittent Fault

SIGNAL TOO LOW. INTERMITTENT FAULT





Checking Cables and Terminals

- Check atmospheric pressure sensor and engine control module (ECM) connectors for loose connections, contact resistance and oxidation.
- Check the cable between atmospheric pressure sensor terminal 3 and engine control module (ECM) #B22 for an intermittent short-circuit to ground.
- Check cable between atmospheric pressure sensor terminal 3 and engine control module (ECM) #B29 for an intermittent open-circuit and intermittent short-circuit to ground.
- Check cable between air conditioning (A/C) pressure sensor terminal 3 and engine control module (ECM) #B29 for an intermittent short-circuit to ground.
- Check cable between accelerometer terminal 1 and engine control module (ECM) #B1 for an intermittent short-circuit to ground.
- Check cable between fuel tank pressure sensor terminal 1 and engine control module (ECM) #B15 for an intermittent short-circuit to ground.

- Then proceed to test step below.

Fault-tracing Information

- For intermittent faults fault-tracing is not followed by a verification because the fault is not present at this moment.
- Do you want to repeat fault-tracing?

Yes:
- Return to Checking Cables and Terminals section above.

No:
- Operation done