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Suspension Control System - Real Time Damping Control Chevrolet Avalanche II

Electronic Suspension 6 illustrations ~3772 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Air Compressor to Frame Nuts15 N.m11 lb ft
Air Line Tube Repair Nut8 N.m70 lb in
Electronic Suspension Control Module Bracket Nut10 N.m89 lb in
Front Position Sensor Link Bracket Bolt9 N.m80 lb in
Front Position Sensor Mounting Bolt12 N.m106 lb in
Front Suspension Position Sensor Link Ball Stud7 N.m62 lb in
Rear Position Sensor Link Bracket Bolt17 N.m13 lb ft
Rear Position Sensor Mounting Bolt12 N.m106 lb in

Scheme 1

Scheme 1: Electronic Suspension Control Schematics
Scheme 1: Electronic Suspension Control Schematics

Scheme 2

Scheme 2
Scheme 2

DIAGNOSTIC CODE INDEX

DTCDescription
DTC C0558C0558 00: Calibration Data Not Programmed
DTC C0575, C0580, C0585, or C0590C0575 01: Left Front Actuator Circuit - Short To Battery C0575 02: Left Front Actuator Circuit - Short To Ground C0575 04: Left Front Actuator Circuit - Open Circuit C0580 01: Right Front Actuator Circuit - Short To Battery C0580 02: Right Front Actuator Circuit - Short To Ground C0580 04: Right Front Actuator Circuit - Open Circuit C0585 01: Left Rear Actuator Circuit - Short To Battery C0585 02: Left Rear Actuator Circuit - Short To Ground C0585 04: Left Rear Actuator Circuit - Open Circuit C0590 01: Right Rear Actuator Circuit - Short To Battery C0590 02: Right Rear Actuator Circuit - Short To Ground C0590 04: Right Rear Actuator Circuit - Open Circuit
DTC C0615, C0620, C0625, or C0630C0615 08: Left Front Position Sensor Circuit - Signal Invalid C0615 55: Left Front Position Sensor Circuit - Expected Number Of Transitions Not Reached C0620 08: Right Front Position Sensor Circuit - Signal Invalid C0620 55: Right Front Position Sensor Circuit - Expected Number Of Transitions Not Reached C0625 08: Left Rear Position Sensor Circuit - Signal Invalid C0625 55: Left Rear Position Sensor Circuit - Expected Number Of Transitions Not Reached C0630 08: Right Rear Position Sensor Circuit - Signal Invalid C0630 55: Right Rear Position Sensor Circuit - Expected Number Of Transitions Not Reached
DTC C0696C0696 00: Position Sensor Overcurrent

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Electronic Suspension Control

Begin the system diagnosis with Diagnostic System Check - Vehicle (with HP2) or Diagnostic System Check - Vehicle (without HP2) . The Diagnostic System Check will provide the following information

  1. The identification of the control modules which command the system.
  2. The ability of the control modules to communicate through the serial data circuit.
  3. The identification of any stored diagnostic trouble codes (DTCs) and their status.

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle (with HP2)»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-system-check-vehicle-with) or «Diagnostic System Check - Vehicle (without HP2)»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-system-check-vehicle-without) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit/System Description

The electronic suspension control module (ESCM) performs checks of internal calibration data. If a fault condition is detected, the ESCM will set the fault DTC, and may, depending upon the fault type, turn ON the SERVICE SUSPENSION SYSTEM message. Recovery from any controller fault condition is attempted only after the ignition is cycled ON and OFF.

Conditions for Running the DTC

  1. Battery voltage is between 9-16 volts
  2. Ignition is ON.

Conditions for Setting the DTC

  1. The DTC is set when any calibration faults internal to the ESCM are detected.
  2. The fault is detected during 3 consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with the scan tool.

Action Taken When the DTC Sets

  1. The ESCM disables all ALC functionality.
  2. The ESCM sends a message to the instrument panel cluster (IPC) to display the SERVICE SUSPENSION SYSTEM message.

Conditions for Clearing the DTC

  1. A current DTC will clear when the ESCM no longer senses the malfunction and the ignition is cycled ON and OFF.
  2. The DTC will remain in history until 50 ignition cycles have occurred.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Verify that DTC C0558 is not set.

  1. If the DTC is set, perform the «Suspension Position Calibration (Without Z95)»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-suspension-leveling) or «Suspension Position Calibration (With Z95)»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-suspension-leveling) procedure. If the DTC resets replace the ESCM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ESCM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle (with HP2)»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-system-check-vehicle-with) or «Diagnostic System Check - Vehicle (without HP2)»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-system-check-vehicle-without) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Left Front Suspension Damper Control Terminal AC0575 02C0575 04C0575 01
Left Front Suspension Damper Control Terminal BC0575 04
Right Front Suspension Damper Control Terminal AC0580 02C0580 04C0580 01
Right Front Suspension Damper Control Terminal BC0580 04
Left Rear Suspension Damper Control Terminal AC0585 02C0585 04C0585 01
Left Rear Suspension Damper Control Terminal BC0585 04
Right Rear Suspension Damper Control Terminal AC0590 02C0590 04C0590 01
Right Rear Suspension Damper Control Terminal BC0590 04

The electronic suspension control module (ESCM) commands variable levels of pulse width modulated current to each damper in response to rough road, or abrupt steering maneuver driving conditions. The ESC module continuously compares each dampers command state with the state of their feedback circuits to ensure they agree.

  1. Battery voltage is between 9-16 volts.
  2. Ignition ON for 30 seconds
  1. The damper coil or the circuits to the coil are shorted to ground, shorted to voltage, or open for 3 consecutive ignition ON cycles.
  2. The vehicle must be driven over 4.8 km/h (3 mph).
  1. The driver information center (DIC) displays the SERVICE SUSPENSION SYSTEM message.
  2. If the DTC symptom 01 is stored, the ESC system is disabled.
  3. If the DTC symptom 02 or 04 is stored, the suspect damper is disabled.
  1. A current DTC will clear on the next consecutive malfunction-free ignition cycle.
  2. A history DTC will clear after 50 consecutive malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

  1. Ignition OFF, disconnect the harness connector at the appropriate suspension damper.
  2. Perform this setup step in the following order: Connect a test lamp between the damper connector control circuit terminal A and control circuit terminal B. 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. 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. 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 ohms between the control terminal A and the low control terminal B of the suspension damper. If not within the specified range, replace the suspension damper.
  1. «Shock Absorber Replacement (1500)»(/chevrolet/avalanche/ii-2006-2013/remont/suspension-rear/#rear-suspension-system) or «Shock Absorber Replacement (2500)»(/chevrolet/avalanche/ii-2006-2013/remont/suspension-rear/#rear-suspension-system)
  2. «Suspension Position Calibration (Without Z95)»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-suspension-leveling) or «Suspension Position Calibration (With Z95)»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-suspension-leveling)
  3. «Control Module References»(/chevrolet/avalanche/ii-2006-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) 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»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure
  1. Perform the «Diagnostic System Check - Vehicle (with HP2)»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-system-check-vehicle-with) or «Diagnostic System Check - Vehicle (without HP2)»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-system-check-vehicle-without) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Left Front Strut Position Sensor Low Reference CircuitC0615 08
Left Front Strut Position Sensor 5 Volt Voltage Reference CircuitC0696C0615 08C0696
Left Front Strut Position Sensor Signal CircuitC0615 08C0615 08C0615 08C0615 55
Right Front Strut Position Sensor Low Reference CircuitC0620 08
Right Front Strut Position Sensor 5 Volt Voltage Reference CircuitC0696C0620 08C0696
Righ Front Strut Position Sensor Signal CircuitC0620 08C0620 08C0620 08C0620 55
Left Rear Strut Position Sensor Low Reference CircuitC0625 08
Left Rear Strut Position Sensor 5 Volt Voltage Reference CircuitC0696C0625 08C0696
Left Rear Strut Position Sensor Signal CircuitC0625 08C0625 08C0625 08C0625 55
Right Rear Strut Position Sensor Low Reference CircuitC0630 08
Right Rear Strut Position Sensor 5 Volt Voltage Reference CircuitC0696C0630 08C0696
Right Rear Strut Position Sensor Signal CircuitC0630 08C0630 08C0630 08C0630 55

The electronic suspension control (ESC) module supplies a 5 volt reference signal to each suspension position sensor. The suspension position sensors supply an voltage signal of 0.35-4.75 volts to the ESC module which represents the position between the body and the wheel. The sensors are also grounded through the ESC module.

  1. Battery voltage is between 9-16 volts
  2. Ignition is ON
  1. The DTC is set when the ESC module measures a position sensor signal voltage below 0.35 volt or above 4.75 volts for more than 1 second while the vehicle is operated under normal driving conditions.
  2. The fault is detected during 3 consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.
  1. The ESC will enter the speed dependent damping mode.
  2. Both left and right normal force outputs will be set to the default output states.
  3. The ESC sends a message to the instrument panel cluster (IPC) to display SERVICE SUSPENSION SYSTEM message.

A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Ignition ON, observe the scan tool Position Sensor Data parameters. The readings should vary between 0.35-4.75 volts while the vehicle is jounced.

  1. Ignition OFF, disconnect the harness connector at the applicable suspension position sensor.
  2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal C and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If circuit tests normal, replace the ESC module.
  3. Ignition ON, test for 4.75-5.25 volts between the 5 volt reference circuit terminal A and ground. 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.
  4. Verify the applicable scan tool position sensor parameter is less than 0.35 volts. If greater than the specified range, test the signal circuit terminal B for a short to voltage. If all circuits test normal replace the ESC module.
  5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5 volt reference circuit terminal A. Verify the scan tool position sensor parameter is greater than 4.75 volts. If less that 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.
  6. If all circuits test normal, test or replace the applicable suspension position sensor.
  1. Install a 3A fused jumper wire between the 5 volt reference terminal A and 5 volts. Install a jumper wire between the low reference terminal C and ground.
  2. Sweep the suspension position sensor through the entire range while monitoring the voltage between the signal terminal B and the low reference terminal C. The range should vary between 0.35-4.75 volts without any spikes or dropouts. If not within the specified range or if it is erratic, replace the applicable suspension position sensor.
  1. «Electronic Suspension Front Position Sensor Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control)
  2. «Electronic Suspension Rear Position Sensor Replacement - Left Side»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control)
  3. «Electronic Suspension Rear Position Sensor Replacement - Right Side»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control)
  4. «Suspension Position Calibration (Without Z95)»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-suspension-leveling) or «Suspension Position Calibration (With Z95)»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-suspension-leveling)
  5. «Control Module References»(/chevrolet/avalanche/ii-2006-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ESC replacement, setup, and programming
  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 applicable, 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»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure.
  1. Perform the «Diagnostic System Check - Vehicle (with HP2)»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-system-check-vehicle-with) or «Diagnostic System Check - Vehicle (without HP2)»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-system-check-vehicle-without) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Left Front Strut Position Sensor Low Reference CircuitC0615 08
Left Front Strut Position Sensor 5 Volt Voltage Reference CircuitC0696C0615 08C0696
Left Front Strut Position Sensor Signal CircuitC0615 08C0615 08C0615 08C0615 55
Right Front Strut Position Sensor Low Reference CircuitC0620 08
Right Front Strut Position Sensor 5 Volt Voltage Reference CircuitC0696C0620 08C0696
Right Front Strut Position Sensor Signal CircuitC0620 08C0620 08C0620 08C0620 55
Left Rear Strut Position Sensor Low Reference CircuitC0625 08
Left Rear Strut Position Sensor 5 Volt Voltage Reference CircuitC0696C0625 08C0696
Left Rear Strut Position Sensor Signal CircuitC0625 08C0625 08C0625 08C0625 55
Right Rear Strut Position Sensor Low Reference CircuitC0630 08
Right Rear Strut Position Sensor 5 Volt Voltage Reference CircuitC0696C0630 08C0696
Right Rear Strut Position Sensor Signal CircuitC0630 08C0630 08C0630 08C0630 55

The electronic suspension control (ESC) module provides a common regulated reference voltage of approximately 5 volts to all of the position sensors. The ESC module monitors this power supply for a malfunction that could prevent it from correctly regulating the supply voltage.

  1. Battery voltage is between 9-16 volts
  2. Ignition is ON
  1. The ESC module senses suspension position sensor supply voltage under 4.75 volts or over 5.25 volts.
  2. The condition is detected for 1 second in 4 consecutive ignition cycles.
  1. Commands speed dependent damping system and normal force signals to the default state.
  2. The ESC sends a message to the instrument panel cluster (IPC) to display SERVICE SUSPENSION SYSTEM message.
  1. A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
  2. The ESC module senses the correct sensor supply voltage.
  3. The IPC clearing DTC feature.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/avalanche/ii-2006-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Ignition ON, observe the scan tool Position Sensor Data parameters. The readings should vary between 0.35-4.75 volts while the vehicle is jounced.

  1. Ignition OFF, disconnect the harness connector at all 4 suspension position sensors.
  2. Ignition ON, test for 4.75-5.25 volts between the 5 volt reference circuit terminal A and ground at each sensor connector. If less than the specified range, test the 5 volt reference circuit for a short to ground or an open/high resistance. If all circuits test 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.
  3. Reinstall each sensor, one at a time, while verifying for 4.75-5.25 volts between the 5 volt reference circuit terminal A and ground of the last sensor connector to be connected. If the voltage is out of the range when one of the 3 sensors are connected, test or replace the suspect suspension position sensor.
  4. Test or replace the last remaining suspect suspension position sensor.
  1. Install a 3A fused jumper wire between the 5 volt reference terminal A and 5 volts. Install a jumper wire between the low reference terminal C and ground.
  2. Sweep the suspension position sensor through the entire range while monitoring the voltage between the signal terminal B and the low reference terminal C. The range should vary between 0.35-4.75 volts without any spikes or dropouts. If not within the specified range or if it is erratic, replace the applicable suspension position sensor.
  1. «Electronic Suspension Front Position Sensor Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control)
  2. «Electronic Suspension Rear Position Sensor Replacement - Left Side»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control)
  3. «Electronic Suspension Rear Position Sensor Replacement - Right Side»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control)
  4. «Suspension Position Calibration (Without Z95)»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-suspension-leveling) or «Suspension Position Calibration (With Z95)»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-suspension-leveling)
  5. «Control Module References»(/chevrolet/avalanche/ii-2006-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ESC module replacement, setup, and programming
  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 applicable, 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»(/chevrolet/avalanche/ii-2006-2013/remont/oem-general-information/#vehicle-diagnostic-information-2-of-2__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure.

Scheme 3

Scheme 3: Electronic Suspension Control Module Replacement
Scheme 3: Electronic Suspension Control Module Replacement
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the spare tire and wheel assembly to access the control module.
1Electronic Suspension Control Module Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tip: Loosen the module nuts. Tighten: 10 N.m (89 lb ft)
2Electronic Suspension Control Module (ESC) Connector Tip: Disconnect the electrical connector from the module.
3Electronic Suspension Control (ESC) Module Procedure Remove the ESC module from the slots in the frame. Reprogram the ESC module. Refer to Electronic Suspension Control Module Programming and Setup (Without Z95) or Electronic Suspension Control Module Programming and Setup (With Z95) .
CAUTION
Refer to Fastener Caution .

Scheme 4

Scheme 4: Electronic Suspension Front Position Sensor Replacement
Scheme 4: Electronic Suspension Front Position Sensor Replacement
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the front tire and wheel assembly. Refer to Tire and Wheel Removal and Installation .
1Front Position Sensor Link Tip: Disconnect the link from the sensor ball stud.
2Front Position Sensor Bolt CAUTION: Refer to Fastener Caution . Tip: Remove the bolt from the sensor. Tighten: 12 N.m (106 lb in)
3Front Position Sensor Tip: Disconnect the electrical connector from the sensor.
CAUTION
Refer to Fastener Caution .

Tools Required

J 38185 Spring Hose Clamp Pliers

Removal Procedure

  1. Remove the ESC sensor from the vehicle. Refer to «Electronic Suspension Front Position Sensor Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control) .
  2. While supporting the sensor lever by hand, twist the link rod to remove it from the ball stud.
  3. Remove the link rod from the mounting bracket ball stud.

Installation Procedure

  1. Using the J 38185 install to link rod to the ball stud on the sensor lever and the mounting bracket.
  2. Install the ESC sensor to the vehicle. Refer to «Electronic Suspension Front Position Sensor Replacement»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control) .

J 38185 Spring Hose Clamp Pliers

  1. Remove the ESC sensor from the vehicle. Refer to «Electronic Suspension Rear Position Sensor Replacement - Left Side»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control) or «Electronic Suspension Rear Position Sensor Replacement - Right Side»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control) .
  2. While supporting the sensor lever by hand, twist the link rod to remove it from the ball stud.
  3. Remove the link rod from the frame bracket ball stud.
  1. Using the J 38185 install to link rod to the ball stud on the sensor lever and the frame bracket.
  2. Install the ESC sensor to the vehicle. Refer to «Electronic Suspension Rear Position Sensor Replacement - Left Side»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control) or «Electronic Suspension Rear Position Sensor Replacement - Right Side»(/chevrolet/avalanche/ii-2006-2013/remont/electronic-suspension/#suspension-control-system-real-time-damping-control) .

Scheme 5

Scheme 5: Electronic Suspension Rear Position Sensor Replacement - Left Side
Scheme 5: Electronic Suspension Rear Position Sensor Replacement - Left Side
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the left rear tire and wheel assembly. Refer to Tire and Wheel Removal and Installation .
1Electrical Connector
2Position Sensor Servo Arm Bracket Bolt CAUTION: Refer to Fastener Caution . Tighten: 17 N.m (13 lb ft)
3Position Sensor Bracket Bolt Tighten: 12 N.m (106 lb in)
4Electronic Suspension Position Sensor
CAUTION
Refer to Fastener Caution .

Scheme 6

Scheme 6: Electronic Suspension Rear Position Sensor Replacement - Right Side
Scheme 6: Electronic Suspension Rear Position Sensor Replacement - Right Side
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the right rear tire and wheel assembly. Refer to Tire and Wheel Removal and Installation .
1Electrical Connector
2Position Sensor Servo Arm Bracket Bolt CAUTION: Refer to Fastener Caution . Tighten: 17 N.m (13 lb ft)
3Position Sensor Bracket Bolt Tighten: 12 N.m (106 lb in)
4Electronic Suspension Position Sensor
CAUTION
Refer to Fastener Caution .

Electronic Suspension Control Description

The electronic suspension control system, also known as the magneto-rheological real time damping (MRRTD) system independently controls the fluid viscosity in each of the 4 shock absorbers in order to control the vehicle ride characteristics. The electronic suspension control (ESC) system is capable of making these changes within milliseconds. The ESC system consists of the following major components

  1. The electronic suspension (ESC) module
  2. The front/rear position sensors
  3. The front/rear adjustable shock absorbers
  4. The shock absorber electrical actuators, which are integrated within the shock absorbers

The ESC controls the damping mode selection according to the following factors

  1. The vehicle speed
  2. The chassis pitch input
  3. The steering position
  4. The body to wheel displacement

The ESC module evaluates these inputs in order to separately control the shock absorbers, providing an enhanced ride and comfort level over the widest possible range of operating conditions.

Electronic Suspension Control Module

The electronic suspension control (ESC) module provides electronic control logic and output drive for each shock absorber. The ESC module makes decisions due to road and driving conditions based on various inputs. The ESC module receives input information by sensors that are directly connected to the ESC module or by other systems through the serial data line and uses these inputs to independently control the shock absorbers at each corner.

Electronic Suspension Control Position Sensors

The electronic suspension control (ESC) position sensors provide the ESC module with the body to wheel displacement input. The ESC module uses this and other inputs in order to control the stiffness of the shock absorber. If any body or wheel motion is detected, the ESC module will determine how soft or firm each shock absorber should be to provide the best ride. The ESC position sensors are mounted at each corner of the vehicle between the control arm and the body/frame.

Electronic Suspension Control Shock Absorber or Strut

The electronic suspension control (ESC) shock absorbers are monotube type which provide damping by increasing magnetic flux to magnetic particles to resist suspension movement. The ESC shock absorber has the capability of providing multiple modes or values of damping forces, in both compression and rebound direction. The damping forces are achieved by increasing or decreasing the magnetic flux to shock absorbers.

The front ESC actuator connector is located at the top of the shock absorber. The rear ESC actuator connector is at the top of the shock absorber.

Electronic Suspension Control Operation

The electronic suspension control (ESC) system uses the information from other systems in order to execute certain functions.

The ESC system does not have a malfunction indicator lamp, but instead uses the instrument panel cluster (IPC) for the display functions. When the ESC system detects a malfunction that sets a DTC, the ESC system sends a message on the serial data line directly or through the powertrain control module (PCM) to the IPC, which will display one of the following messages

  1. SHOCKS INOPERATIVE
  2. SERVICE SUSPENSION SYSTEM
  3. SPEED LIMITED

The SHOCKS INOPERATIVE message will only be displayed if the ESC system detects a malfunction that sets a DTC and causes the ESC system to disable all 4 shock absorbers. The ESC system will send a message on the serial data line to the IPC to display this message.

The SERVICE SUSPENSION SYSTEM message will only be displayed if the ESC system detects any malfunction that sets a DTC. The ESC system will send a message on the serial data line to the IPC to display this message.

The SPEED LIMITED message will only be displayed if the ESC system detects a malfunction that sets a DTC and causes the ESC system to disable all 4 shock absorbers. The ESC system will send a message on the serial data line to the PCM indicating that all 4 shock absorbers were disabled. The PCM then sends a message to the IPC to display this message.

The ESC module has the ability to store DTCs as current or history codes. Most ESC system malfunctions will display a message in the IPC and set a DTC. The message will remain ON until the RESET button is pressed on the driver information center (DIC). As long as the DTC is current, the message will be displayed after every ignition cycle and the RESET button must be pressed to bypass the message.

The ESC system uses an ignition cycling diagnostic approach in order to reduce the occurrence of false or intermittent DTCs that do not affect the functionality of the ESC system. This allows for the fail-soft actions to be taken whenever a malfunction condition is current, but requires the malfunction to be current for a certain number of ignition cycles before the corresponding malfunction code and message will be stored or displayed.

If the ESC detects a malfunction, the ESC system defaults with a fail-soft action. A fail-soft action refers to any specific action the ESC system takes in order to compensate for a detected malfunction. A typical ESC fail-soft action would be if the ESC system detects a malfunction with a shock absorber.

Special Tools

Illustration Tool Number/ Description J 38185 Hose Clamp Pliers

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