2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 976
Circuit/System Verification
Ignition ON, with the scan tool command the damper actuators ON and OFF while jouncing the vehicle in the front and rear. The suspension
should change stiffness when commanded between the ON and OFF state.
Circuit/System Testing
Important: Whenever repairing and/or replacing ALC system components, perform the Suspension Position Calibration procedure.
1. Ignition OFF, disconnect the harness connector at the appropriate suspension damper.
2. Perform this setup step in the following order:
1. Connect a test lamp between the damper connector control circuit terminal A and control circuit terminal B.
2. Ignition ON, with a scan tool, clear all ESC module DTCs.
3. Command the damper ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
锟斤拷If the test lamp is always ON, test the control circuit terminal A for a short to voltage. If the circuit tests normal, replace the ESC module.
锟斤拷If the test lamp is always OFF, test the control circuits listed below. If all circuits test normal, replace the ESC module.
* Control circuit terminal A for a short to ground or open/high resistance.
* Control circuit terminal B for an open/high resistance or short to voltage.
4. If all circuits test normal, test or replace the suspension damper.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate suspension damper.
2. Test for.7-3.3 ohm between the control terminal A and the low control terminal B of the suspension damper.
锟斤拷If not within the specified range, replace the suspension damper.
Repair Instructions
* Shock Absorber Replacement (1500) (See: Steering and Suspension/Suspension/Suspension Strut / Shock Absorber/Service and
Repair/Rear Suspension Shock Absorber/Shock Absorber Replacement (1500))Shock Absorber Replacement (2500) (See: Steering and
Suspension/Suspension/Suspension Strut / Shock Absorber/Service and Repair/Rear Suspension Shock Absorber/Shock Absorber
Replacement (2500))
* Suspension Position Calibration (With Z95) (See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic
)/Service and Repair/Suspension Position Calibration (With Z95))Suspension Position Calibration (Without Z95) (See: Steering and
Suspension/Suspension/Suspension Control ( Automatic - Electronic )/Service and Repair/Suspension Position Calibration (Without Z95))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ESCM replacement, setup, and programming
Repair Verification
1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Use the scan tool Diagnostic Counter Reset output control function to bypass the 3 consecutive ignition cycle requirement for setting a DTC.
This will ensure that if a DTC was to be reset during the repair verification process, it will be displayed on the scan tool.
5. Turn OFF the ignition for 60 seconds.
6. Turn ON the ignition.
7. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if appropriate,
in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List -
Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) and perform the appropriate diagnostic
procedure
C0590
DTC C0575, C0580, C0585, or C0590
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
