Intermittent Running/Dying - CPS Harness Plug Wire Detached

Electricalintermediate✓ Community Verified

Problem

Engine runs erratically and dies intermittently, regardless of temperature. The car would run fine and then suddenly die. Diagnostic codes would not display when jumping the diagnostic box.

Engine runs erratically then dies suddenlyIntermittent no-start condition requiring wire wiggling to startProblem occurs regardless of engine temperature (cold or warm)Diagnostic codes not displaying when jumping diag boxErratic RPM gauge behavior

Root Cause

The harness-side G- (ground) plug wire had detached inside the CPS connector and was only making intermittent contact by touching the back of the plug. The Ne+ wire above it was also heading in the same direction. The wires break where they enter the rubber weather grommet on the CPS plug, which hardens over time and stresses the connections. The plastic catches on the individual connector pins also tend to break when attempting removal.

Confidence

Moderate confidence — Multiple community members agreed on this solution

View Original Thread →Posted August 2024 on SupraForums.com