Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Checking wiring
Check the engine control module (ECM) and atmospheric pressure sensor connectors for contact resistance and oxidation according to Contact resistance and oxidation .
Check in particular for damage, or loose terminal pins.
Check the signal cable between engine control module (ECM) terminal 18 and atmospheric pressure sensor terminal 3 for an intermittent short-circuit to supply voltage. Remedy according to Short-circuit to supply voltage, intermittent faults .
Check the voltage cable between engine control module (ECM) connector terminal 77 and atmospheric pressure sensor terminal 2 for an intermittent open-circuit. Remedy according to Open-circuit, intermittent faults .
Other information
- To connect the breakout box, see Connecting the breakout box. EMS 2000
- To replace the atmospheric pressure sensor, see Replacing the air conditioning (A/C) system pressure sensor .
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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