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Skyvisions
Skyvisions, ASE Certified Technician
Category: Toyota
Satisfied Customers: 14505
Experience:  Toyota Master Diagnostic
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I have a 1992 Toyota land cruiser all relays and fuses are

Customer Question

I have a 1992 Toyota land cruiser all relays and fuses are good but no cel and no fire
Submitted: 2 years ago.
Category: Toyota
Expert:  Skyvisions replied 2 years ago.

Does the Check engine light ever come on with the key in the on position? Do you have a voltmeter and a reasonable knowledge of how to use it.

Customer: replied 2 years ago.
Check engine never comes on even when the key is on ...I'm the senior Instrumentation and Controls tech here at University of Virginia so I have a good understanding of electronics I have a bad feeling its my ECM but i have no way of checking it and will you get spark if the ECM is unplugged
Expert:  Skyvisions replied 2 years ago.

No on the unplugging of the ECM and spark it will not spark. Use a pick and remove the wire clip on the connector going to the MAF and disconnect the PLUG from the MAF. Turn the key on and see if the check engine light now illuminates. Let me know how this test goes.

Customer: replied 2 years ago.
Ok I'll try that this evening .
Expert:  Skyvisions replied 2 years ago.

ok

Customer: replied 2 years ago.
That's after putting the ECM back in ?
Expert:  Skyvisions replied 2 years ago.

Yes everything back to normal and the battery fully charged and only the MAF disconnected.

Customer: replied 2 years ago.
Ok I'll try that this evening and I have a brand new battery
Expert:  Skyvisions replied 2 years ago.

OK

Customer: replied 2 years ago.
I unplug the MAF and turn the ignition to on no CEL
Expert:  Skyvisions replied 2 years ago.

Ok I will look at the wiring diagram and get you some voltage tests tomorrow.