No Speedo/Odometer 1991 L98
01-09-2010, 09:42 AM
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No Speedo/Odometer 1991 L98
I bought a 1991 L98 and am trying to diagnose a few problems. My speedo/odometer do not work. The cruise control and horn wont work either. The service ride control lite stays on. Disconnted the fx3 module no change. Replaced the vss, no change. Replaced dash cluster, no change. Pulled ccm codes got h72,h74. Aftermarket radio was installed. From reading other posts, I am leaning towards a bad ccm or ecm.
01-12-2010, 02:52 AM
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I bought a 1991 L98 and am trying to diagnose a few problems. My speedo/odometer do not work. The cruise control and horn wont work either. The service ride control lite stays on. Disconnted the fx3 module no change. Replaced the vss, no change. Replaced dash cluster, no change. Pulled ccm codes got h72,h74. Aftermarket radio was installed. From reading other posts, I am leaning towards a bad ccm or ecm.
Does your service engine soon light come up when you turn on the ignition?
If it does and goes off when you start, does it come on again when engine is running?
Check those codes first by grounding the two upper right terminals A-B in the ALDL (above your right knee).
