What is CHECK ENGINE Code FF77 for '94 XJS V12 6L

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Sep 5, 2018 | 08:14 PM

JagDE45

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From: Florida Georgia North Carolina

What is CHECK ENGINE Code FF77 for '94 XJS V12 6L

Want to be sure I'm chasing the right Gremlin....Thanks

Sep 5, 2018 | 11:06 PM

Jagboi64

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From: Calgary, Canada

FF77 is lack of a speed (RPM) signal from the ignition computer into the fuel computer. The description below is from the fuel computer codes. PCMI is Powertrain Control Module Ignition.

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