Diagnosis & Testing: INTERMITTENTS

Most intermittent problems are caused by faulty electrical connections or wiring; however, a sticking relay or solenoid can cause a failure.

When intermittent failure is encountered, check for fault messages stored in CAB. If fault messages are found, inspect related components and circuitry for poor connections. If no trouble codes are found, inspect suspect circuits as follows:

• Check for poor mating of connector halves, or terminals not fully seated in connector body (backed-out).
• Check for improperly formed or damaged terminals. Carefully reform all connector terminals of problem circuit to increase contact tension.
• Check for poor terminal-to-wire connection.
• Check for hydraulic system leaks.