Continuously Variable Road Sensing Suspension (Cvrss)

Fig. 72 Code RS0038: ELC Exhaust Solenoid Valve Short To Ground/Open Circuit.:

DTC RS0038 ELC Exhaust Solenoid Valve Short To Ground/Open Circuit:

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 valve circuit on the low side of the coil during commanded off states, and expects to see a high voltage on the circuit.

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

ACTION TAKE:
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 off state, a high voltage level (battery voltage) is expected. If a low voltage level is present, most likely due to a short circuit to ground or an open circuit in the solenoid coil or wiring, 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 off state, which occurs whenever exhaust activity is not required. 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 on time occurs.

NOTES ON FAULT TREE:
1. Refer to notes on Intermittant.
2. This code may be caused by a compressor overload which could cause the fuse to blow.
3. The code may cause this condition by overloading the compression.
4. Clear codes. Clearing Diagnostic Trouble Codes