S037

CODE S037 ELC EXHAUST VALVE SHORT TO VOLTAGE









TEST CONDITIONS:
The RSS control module monitors the exhaust solenoid circuit on the low-side of the coil during commanded on states. The module expects to see the circuit low.

FAULT CONDITIONS:
If the RSS control module sees the circuit high for 200 mS during an on state and appropriate decoding has occurred, a code is set.

ACTION TAKEN:
Set code, turn on "SERVICE RIDE CONTROL" message, and stop driving the exhaust solenoid for the remainder of the ignition cycle.

DESCRIPTION:
Leveling errors are detected via a single error feedback signal from a four-channel integrated circuit (QDM) which drives both the compressor relay and the exhaust solenoid. The RSS control module monitors this discrete feedback through all four possible leveling states (Compressor = Off & Exhaust = Off, Compressor Off & Exhaust = On, Compressor = On & Exhaust = Off, Compressor = On & Exhaust = On) and decodes it only when all four states have been seen. All four states occur slightly after every ignition on when the leveling system goes through an Air Replenishment Cycle, as well as during normal operation. Only electrical problems with the exhaust valve solenoid will be flagged. The default mode for the relay is normally closed with zero current so no exhaust occurs. Pneumatic blockage problems will not set a code, but the RSS control module will shut the exhaust function off if no progress is made or if excessive on time occurs.

NOTES ON FAULT TREE:
[1] Refer to notes on intermittents.
[2] Refer to clearing codes.

IMPORTANT:
^ WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETE, CLEAR CODES AND VERIFY OPERATION.