System Fault Messages

Fault messages for speed control or charging system diagnostics and their definitions are listed below.

NO VEHICLE SPEED SIGNAL - No distance sensor is detected during road load conditions.

SPEED CONTROL SOLENOID CIRCUITS - An open or shorted condition is detected in the speed control vacuum or vent solenoid circuits.

ALTERNATOR FIELD NOT SWITCHING PROPERLY - An open or shorted condition is detected in the alternator field control circuit.

BATTERY TEMP SENSOR - VOLTAGE OUT OF LIMIT - Internal controller failure with battery temperature sensor out of range.

CHARGING SYSTEM VOLTAGE TOO HIGH - Battery voltage sense input is above the target charging voltage during engine operation.

CHARGING SYSTEM VOLTAGE TOO LOW - Battery voltage sense input is below target charging voltage during engine operation and no significant change in voltage is detected during active test of alternator output.

SPEED CONTROL POWER RELAY CIRCUIT - An open or shorted condition is detected in the speed control power relay.

Start Counter
The start counter counts the number of times the vehicle has been started since faults were last set, erased, or the battery was disconnected. The counter will count up to 255 starts. When there are no faults stored in memory, the DRBII will display "NO FAULTS DETECTED" and the counter will show "0 FAULTS SINCE ERS".

Using the DRBII, read faults to determine if the fault is the third fault or less. If it is, a start counter of "0" (zero) equals a hard fault. Any other fault is classified as an intermittent fault (except some faults with long mature times, such as "Engine is Cold Too Long").