| Table 1: | Automatic Level Control Module Scan Tool Information |
| Table 2: | Automatic Level Control Output Controls |
Parameter | System State | Expected Value | Description |
|---|---|---|---|
Operating Conditions: Turn the Ignition ON, Engine OFF/Vehicle Trim Height within Specifications | |||
Battery Voltage Signal | -- | B+ | The scan tool displays 0-26.0 volts. The battery voltage represents the system voltage measured at the controller battery input. |
Compressor Relay Cmd. | -- | Off | The scan tool displays On or Off. This is the status of the compressor relay. |
Exhaust Valve Command | -- | Off | The scan tool displays On or Off. This is the status of the exhaust valve. |
Suspension Position Sensor | -- | Varies | The scan tool displays volts. This is the current voltage for the suspension position sensor. |
Vehicle Speed | -- | Varies | The scan tool displays 0-255 km/h (0-159 mph). The ESC system obtains vehicle speed data from the powertrain control module (PCM) on a dedicated input. The PCM is responsible for calculating correct vehicle speed data. |
Output Control | Description |
|---|---|
ALC Trimset | Calibrates the adjustment of the height sensor |
Compressor Test | Commands the air pressure of the shocks ON and OFF |
Exhaust Valve | Commands the exhaust value ON and OFF. The engine must be running to use this control. Commands the exhaust value ON and OFF. The engine must be running to use this control. |
Reset Diagnostic Counter | Commands the module to reset the internal ignition cycle counter. This enables the module to set DTCs 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 count is re-enabled. |
