Suspension Control - Speed Sensitive Suspension (SSS)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

Pin 'C3' of the control module is connected to the Powertrain Control Module. The PCM pulls the signal low to indicate a hard acceleration (lift) or deceleration (dive). Upon a transition from a high to a low state, the control module shall command the firm setting and maintain it until a low to high transition is detected.

TEST CONDITION(S)

The control module will monitor the Lift / Dive signal which is pulled low then high by the PCM.

FAILURE CONDITION(S)

If the control module does not see the low to high transition within 15 seconds after key 'ON' it suspects a Lift / Dive signal error, but waits until the test has failed on the second consecutive ignition cycle to set the error in memory.

ACTION TAKEN

Record Lift / Dive Signal error, turn 'ON' 'SERVICE RIDE CONTROL' message. The system recovers upon successful completion of the lift / dive signal power on test at the beginning of the next ignition cycle.

NOTES ON INTERMITTENTS

Whenever checking Lift / Dive signal, the ignition must be turned off then on twice for the code to reset.

If the car is put into crank while in gear, the module shuts 'OFF', but the PCM doesn't, so the Lift / Dive handshake is not performed and the code may be set.

NOTES ON FAULT TREE

1. Refer to 'Notes on Intermittents'. Notes on Intermittents

2. The PCM handshake may also be monitored while in ECM Outputs Cycle All (EO99). The EO99 value should go LO and HI and the voltage at the control module should respond likewise. A high to low voltage change should also be noticed when the accelerator pedal is depressed quickly.