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.
Fuel Injected
The EGR lift sensor detects amount of EGR valve lift and sends this information to ECU. ECU compares lift signal with internal calibration tables and modifies signals to EGR control solenoid to produce the desired vacuum signal to the EGR valve. Manifold vacuum signal to solenoid is regulated at about 8 in. Hg by the Constant Vacuum Control (CVC) valve. If lift sensor signal does not respond to regulated vacuum signal as expected, ECU will set code 12 in memory and turn on the dash mounted PGM-FI warning light. If light is on and code 12 is set in memory, see appropriate article in the COMPUTERIZED ENGINE CONTROLS section.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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