A scan tool may be used in order to command the shock absorbers ON or OFF, without the need for input information from other components. This can be very helpful in determining if a certain portion of a circuit or a component is in working order. The table below lists the tests that are available for the electronic suspension control system. The tests are listed in alphabetical order.
Using a scan tool, select the ESC Special Functions from the scan tool menu. The status of the output being cycled will be shown on the scan tool's display screen. The shock absorbers can be cycled to turn ON or OFF by selecting ESC Special Functions on the scan tool.
Using the LF shock absorber as an example, commanding the LF shock absorber ON can indicate whether the electronic suspension control (ESC) system is able to correctly operate the LF shock absorber. This can determine if a DTC that pertains to that shock absorber is able to reset, and if the ESC module's internal circuitry is able to operate the LF shock absorber. For example, suppose the ESC system sets an intermittent DTC C0577, which is LF Shock Absorber Solenoid Short to Ground. In order to diagnose this condition using a scan tool, select the ESC special Functions. Then, cycle the LF shock absorber solenoid while moving the suspected wiring/connector. Attempt to duplicate the malfunction conditions. This scan tool feature allows checks that could not be performed while driving the vehicle. This example can be applied to the other shock absorbers.
Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
ALC Trimset | ESCM | Commands the recalibration of the suspension control module for ride height. |
Compressor Test | ESCM | Commands the compressor ON and OFF. The engine must be running to use this control. |
Exhaust Valve | ESCM | Commands the exhaust value ON and OFF. The engine must be running to use this control. |
LF Damper Actuator | ESCM | Commands the left front shock solenoid ON and OFF. |
LR Damper Actuator | ESCM | Commands the left rear shock solenoid ON and OFF. |
RF Damper Actuator | ESCM | Commands the right front shock solenoid ON and OFF. |
RR Damper Actuator | ESCM | Commands the right rear shock solenoid ON and OFF. |
Reset Diagnostic Counter | ESCM | Commands the module to reset the internal ignition cycle counter. This enables the module to set DTC's immediately by bypassing the requirement to see the fault condition for 3 consecutive ignition cycles before a DTC is set. Once the ignition is cycled, the ignition cycle counter is re-enabled. |
