Intermittents

SYMPTOM DESCRIPTION:

FAULTY ELECTRICAL CONNECTIONS OR WIRING

Most intermittent problems are caused by faulty electrical connections or wiring. Perform a careful check of suspect circuits for:

Signs of moisture at terminal connectors or relay boxes.
Poor mating of the connector halves, or terminals not fully seated in the connector body (backed out).
Improperly formed or damaged terminals. All connector terminals in problem circuit should be carefully reformed or replaced to insure proper contact tension.
Poor terminal to wire connection. This requires removing the terminal from the connector body to check.

ROAD TEST

If a visual/physical check does not find the cause of the problem, the vehicle can be driven with a voltmeter connected to a suspected circuit. An abnormal voltage reading, when the problem occurs, indicates the problem may be in that circuit. If the wiring and connectors checkout OK, replace the suspect sensor. If an abnormal voltage reading is detected, the wiring and connectors are OK, then the control unit(s) or power supply may be defective.