EVP sensor resistance

Pyro · Aug 27, 2003

Does anybody know what the propper resistance readings are for the EVP sensor when the EGR valve is closed?

It's my understanding that the EVP sensor is just an overglorified potentiometer so I'm considering replacing it with a potentiometer or resistor combination so the computer will believe my egr is stuck closed and not run lean.

I've heard this is in the Haynes manual but mine is 1400Kms away. Any help would be greatly appreciated.

FoxChassis · Aug 27, 2003

The following are electrical test procedures from How to Understand, Service and Modify Ford Fuel Injection & Electronic Engine Control by Charles O. Probst, SAE (1988-1993).

All tests should be done when the engine is at operating temperature although that is not always possible or prudent.

EVP Sensor Electrical Tests

EVP Resistance

Conditions:
- Key off, disconnect EVP sensor connector
- Connect ohmmeter to connector at EVP SIG and VREF
- Disconnect vacuum line to EGR
- Connect vacuum pump, increase vacuum

Test Results:
5500 Ohms to 100 Ohms as vacuum increases to 34 kPa (10 in. Hg)

If Not:
EGR valve or EVP sensor may be faulty

VREF at EVP sensor

Conditions:
- Key off, disconnect EVP sensor connector
- Key on, measure voltage at vehicle side of harness between VREF and SIG RTN

Test Results:
+4-6v DC

If Not:
Wiring or EEC-IV module may be faulty.

EVP sensor resistance

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