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Re: Tachometer
This is likely an "and this failed too".
The tach is driven from the engine speed signal out of the PCM. It's a white wire at the cluster plug IIRC. It's a digital signal. You can check the signal with an oscilloscope but don't plug a meter or anything else into it.
The PCM should be reasonably protected in the engine bay and I'd expect other stuff to stop working if the PCM wiring got damaged.
The 2001 uses air core motors not steppers like the 2003-2007.
Usually the air core gauge motors don't fail but sometimes the electronics get flaky.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
Last edited by hatzie; 07-10-2022 at 05:12 PM.
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