Engine/Transmission (1994 - 1998) Need Help?? no tach, no spedo, no alt, no cc, no od!!!

[Howard Durand]

Have him check the engine speed sensor first. It is located at the front of the engine right above the vibration dampner. It senses the notches in the dampner to determine engine speed. It's signal is sent to the PCM for determining RPM and also is vital in that it controls the voltage regulator built into the PCM.

It connects into the wiring harness at the top of the engine. It wouldn't hurt to clean the connector with a good electronics cleaner then make sure the sensor is adjusted properly. Use a non magnetic feeler gauge and adjust the gap between the sensor and the dampner to 0. 050"

He should check the voltage at the plug. If the 95 is like my 94, it would be 8 volts between the orange wire and the black wire. He also has a 5 volt source at the PCM but it is only used on the TPS.

If he gets 8 volts between the orange wire and the black wire at the plug, but still has the problem, you could try your sensor in place of his. If that makes no difference, I would guess a PCM problem or possibly a bad ground somewhere.

 

[BigPapa]

Thanks Howard!



Scott

 

[Howard Durand]

The failures you describe would indicate a problem with the engine speed sensor.

If it turns out that the ESS is ok but the voltage regulator is bad, that would indicate PCM replacement but I have read on the forum where it is possible to use an aftermarket VR and eliminate the need to replace the PCM.

Check the threads for VR problems.

 

[LBrazdys]

Check The Wiring Inside The Trans Pan!!!!!!!!!!!!!!!!!!!!!!!!



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