Intermittent failures in electronic systems may be very
difficult to detect and accurately diagnose. The CVRSS control module tests
for different malfunctions under different vehicle conditions; for this
reason, it is often necessary to perform a test drive to repeat the failure
and allow a code to set. If the system malfunction is not repeated during
the test drive, a good description of the complaint may be very useful
in locating an intermittent fault condition. Most intermittent problems
are caused by faulty electrical connections or wiring. When an intermittent
condition is suspected, check suspected circuits for:
| • | Poor mating of connector halves or terminals not fully seated
in connector body (backed out) |
| • | Improperly formed or damaged terminals |
| • | Poor wire to terminal connections |
| • | Dirt or corrosion on the terminals |
HISTORY codes are used to help diagnose intermittent fault conditions
and do not necessarily indicate a faulty CVRSS control module. Most system
complaints are linked to faulty wiring and connectors, and occasionally
components. Always perform a thorough inspection of all related wiring
and connectors pertaining to the HISTORY code stored.
The following conditions may result in an intermittent operation of
the SERVICE RIDE CONTROL message with no code(s) stored:
| • | Any condition which results in interruption of power to the CVRSS
control module |
| • | Battery or ignition voltage which is out of range (below 10 volts
or above 16 volts) |
| • | Loose or damaged grounds |
