Diagnostic Aids
Check for proper installation of PROM. Ensure knock sensor wire is not routed too close to secondary ignition wires which may cause a false knock signal.
Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connections or damaged harness.
Perform intermittent check by monitoring circuit and code status while wiggling related wiring and connectors. If failure is induced, monitored circuit status will change rapidly and/or related code will set.