Suspension Control - Computer Command Ride (CCR/SSS)

TEST CONDITIONS:

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

FAULT CONDITIONS:

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 vehicle has reached 15 MPH before the error is set in memory.

ACTION TAKEN:

Record Lift / Dive Signal error, Turn on "SERVICE CCR SYSTEM" message, The system recovers upon successful completion of the lift / dive signal power on test at the beginning of the next ignition cycle.

DESCRIPTION:

Pin C3 of the CCR 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 CCR control module shall command the firm setting and maintain it until a low to high transition is detected.

NOTES ON FAULT TREE:

[1] The PCM to CCR 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 CCR control, module should respond likewise. A high to low voltage change should also be noticed when the accelerator pedal is depressed, quickly.

NOTES ON INTERMITTENTS:

Whenever checking Lift 1 Dive signal, the ignition must be turned off then on and the car driven over 15 MPH for the code to reset.

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