• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
5-Volt Reference | 5 Volts | 0 Volts | 14 Volts |
ESC Sensor Signal | 0 Volts | 0 Volts | 0-14 Volts |
Return Circuit | -- | 0-14 Volts |
The electronic suspension control (ESC) module supplies a 5-volt reference signal to the suspension position sensor. The suspension position sensor supplies an analog voltage (0.25-4.75 volts) back to the ESC module which represents the position between the body and the wheel. The sensor is also grounded through the ESC module.
Ignition ON.
• | The DTC is set when the ESC module measures the position sensor signal voltage below 0.25 volt or above 4.75 volts for more than 1 second while the vehicle is operated under normal driving conditions. |
• | The fault is detected during 3 consecutive ignition cycles or during the same ignition cycle after clearing the DTC with a scan tool. |
• | The ESC will enter the speed dependent damping mode |
• | Both left and right normal force outputs will be set to the default output states |
• | The ESC module illuminates the LED in the ESC switch. |
• | A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present. |
• | Using a Tech2 Scan tool |
Electronic Suspension Control Schematics .
When all DTC's are cleared, and the Diagnostic System Check - Vehicle has been performed the ESC malfunction indicator lamp may stay illuminated for a period of up to 5 seconds when the ignition switch is moved to the "off" position. The ESC malfunction indicator lamp should switch off when the ignition is switched to the "on" position.
Component Connector End Views .
• | Circuit Testing . |
• | Wiring Repairs . |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If circuit tests normal, replace the ESC module. |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ESC module. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ESC module. |
⇒ | If greater than the specified range, test the signal circuit terminal for a short to voltage. If all circuits test normal, replace the ESC module. |
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If all circuits test normal replace the ESC module. |
⇒ | If not within the specified range or is erratic, replace the appropriate suspension position sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Position Sensor Replacement |
• | Electronic Suspension Control Module Replacement for electronic suspension control module replacement, setup and programming. |