I replaced the camshaft sensor and mass air flow sensor and code 13 is still coming up tachometer is rev up and down in idle and in drive at idle
The RPM signal comes from the crank sensor. The harness connector needs
to be checked for a 5v reference signal and the ground side needs to be
checked for a good ground. This test is to rule out the computer as
being the issue. Then the signal wire needs to be checked for a good
signal. When the crank sensor fails you get not spark and no fuel.,
You will need a waveform viewer to determine if the sensor has failed.
You will need a basic meter to determine if the computer has failed.
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