Continuously Variable Road Sensing Suspension (Cvrss)

Fig. 71 Code RS0037: ELC Exhaust Solenoid Valve Short To Voltage.:

DTC RS0037 ELC Exhaust Solenoid Valve Short To Voltage:

TEST CONDITIONS:
The CVRSS exhaust solenoid valve output is a low-side drive, switched to ground by the CVRSS control module whenever exhaust is required and during a "head-relief" sequence which occurs at compressor start-up. The control module monitors the exhaust solenoid valve circuit on the low side of the coil during commanded on states, and expects to see a low voltage on the circuit.

FAULT CONDITIONS:
If the CVRSS control module sees a high voltage on the circuit for 200 mS during a commanded on (low voltage) state, an ELC Exhaust Solenoid Valve Short to Voltage fault condition is detected.

ACTION TAKEN:
Set fault code and stop driving both the exhaust valve and the compressor relay for the remainder of the ignition cycle.

DESCRIPTION:
The exhaust solenoid valve low-side drive output from the control module is continually monitored to determine if the voltage level agrees with the commanded state. When the exhaust valve is commanded to the on state, a low voltage level (ground) is expected. If a high voltage level is present, most likely due to a short circuit to battery or a shorted solenoid coil, a fault condition is suspected. If this condition exists for 200 mS, the control module will set the fault code, turn on the "SERVICE RIDE CONTROL" message, and disable the exhaust solenoid valve and compressor relay outputs. Recovery is not attempted until ignition is cycled off and on.

This fault condition is detectable only when the exhaust solenoid valve output is commanded to the on state, which occurs during the compressor start-up and whenever a downward correction is necessary. Only electrical problems with the exhaust solenoid valve will be flagged. Pneumatic blockage problems will not set a code, but the CVRSS control module will shut off the exhaust function if no progress is made or if excessive run time occurs.

NOTES ON FAULT TREE:
1. Refer to notes on Intermittant.
2. Clear codes. Clearing Diagnostic Trouble Codes