Diagnosis (Signal Too Low, Intermittent Fault)
Checking cables and terminals.
NOTE:
Atmospheric pressure sensor is used on turbocharged engines.
- Check air conditioning (A/C) pressure sensor and engine control module (ECM) connectors for loose connections and contact resistance and oxidation.
- Check cable between air conditioning (A/C) pressure sensor terminal 3 and ECM terminal No. B29 for an intermittent open-circuit and an intermittent short circuit to ground.
- Check cable between air conditioning (A/C) pressure sensor terminal 2 and ECM terminal No. B9 for an intermittent short circuit to ground.
- Check cables between accelerometer terminal 1 and ECM terminal No. B1, atmospheric pressure sensor terminal 1 and ECM terminal No. B29, and fuel tank pressure sensor terminal 1 and ECM terminal No. B15 for an intermittent short circuit to ground.