Intermittent failures in electronic systems may be very
difficult to detect and accurately diagnose. The CVRSS 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 DTC 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 DTCs are used to help diagnose intermittent fault conditions
and do not necessarily indicate a faulty CVRSS 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 DTC stored.
The following conditions may result in an intermittent operation of
the SERVICE RIDE CONTROL message with no DTC(s) stored:
| • | Any condition which results in interruption of power to the CVRSS
module |
| • | Battery or ignition voltage which is out of range (below 10 volts
or above 16 volts) |
| • | Loose or damaged grounds |
