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Electronic Chassis Control: Diagnosis Saab 9-4X I

Electronic Suspension ~2382 words

Ride Diagnosis

StepActionYesNo
1Did you review the General Description and perform the necessary inspections?Go to Step 2Go to SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS
2IMPORTANT: Verify the vehicle suspension package RPO. Verify that the ride is too soft or too hard. Does the vehicle ride normally?System OKGo to Step 3
3Check the tire inflation and adjust to specifications. Refer to VEHICLE CERTIFICATION, TIRE PLACARD, ANTI-THEFT, AND SERVICE PARTS ID LABEL . Did you adjust the tire pressure?Go to Step 6Go to Step 4
4Inspect the vehicle trim height. Refer to TRIM HEIGHT INSPECTION . Did you find and correct the condition?Go to Step 6Go to Step 5
5Inspect the following suspension components for wear or damage: Shock Absorbers-Refer to SUSPENSION STRUT AND SHOCK ABSORBER TESTING - ON VEHICLE . Springs Did you find and correct the condition?Go to Step 6
6Drive the vehicle in order to verify the repair. Did you correct the condition?System OKGo to Step 3
IMPORTANT
Verify the vehicle suspension package RPO.

Diagnostic Instructions

  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC Descriptor

DTC C0000 71

Vehicle Speed Information Circuit Invalid Data

Conditions for Running the DTC

System voltage is between 9-16 V.

Conditions for Setting the DTC

A supervised periodic message that includes the wheel speed serial data has not been received.

Action Taken When the DTC Sets

The electronic suspension control is disabled for the duration of the ignition cycle.

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes.

Scan Tool Reference

CONTROL MODULE REFERENCES for diagnostic tool information

Circuit/System Testing

  1. Ignition ON, verify that DTC C0035, C0040, C0045, or C0050 is not present in the K17 electronic brake control module (EBCM).
  2. If any listed DTC is present, refer to «DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE»(ref-652232-S23450649802014082300000) .
  3. Replace the K19 Suspension Control Module and verify the DTC does not reset.
  4. If the DTC resets, replace the K17 electronic brake control module (EBCM).
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC Descriptors

DTC C0575 02

Left Front Damper Actuator Circuit Short to Ground

DTC C0575 04

Left Front Damper Actuator Circuit Open

DTC C0575 0F

Left Front Damper Actuator Circuit Signal Erratic

DTC C0580 02

Right Front Damper Actuator Circuit Short to Ground

DTC C0580 04

Right Front Damper Actuator Circuit Open

DTC C0580 0F

Right Front Damper Actuator Circuit Signal Erratic

DTC C0585 02

Left Rear Damper Actuator Circuit Short to Ground

DTC C0585 04

Left Rear Damper Actuator Circuit Open

DTC C0585 0F

Left Rear Damper Actuator Circuit Signal Erratic

DTC C0590 02

Right Rear Damper Actuator Circuit Short to Ground

DTC C0590 04

Right Rear Damper Actuator Circuit Open

DTC C0590 0F

Right Rear Damper Actuator Circuit Signal Erratic

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Left Front Damper Actuator Control HighC0575 02C0575 04C0575 02C0575 0F
Right Front Damper Actuator Control HighC0580 02C0580 04C0580 02C0580 0F
Left Rear Damper Actuator Control HighC0585 02C0585 04C0585 02C0585 0F
Right Rear Damper Actuator Control HighC0590 02C0590 04C0590 02C0590 0F
Left Front Damper Actuator Control LowC0575 02C0575 04C0575 04C0575 0F
Right Front Damper Actuator Control LowC0580 02C0580 04C0580 04C0580 0F
Left Rear Damper Actuator Control LowC0585 02C0585 04C0585 04C0585 0F
Right Rear Damper Actuator Control LowC0590 02C0590 04C0590 04C0590 0F

System voltage is between 9-16 V.

C0575 02, C0580 02, C0585 02, and C0590 02

  1. A short to voltage or short to ground on the control high circuit is detected.
  2. A short to ground on the control low circuit is detected.

C0575 04, C0580 04, C0585 04, and C0590 04

  1. An open circuit on the control high or control low circuit is detected.
  2. A short to voltage on the control low circuit is detected.

C0575 0F, C0580 0F, C0585 0F, and C0590 0F

An erratic current on the actuator circuit is detected.

  1. The electronic suspension control is disabled for the duration of the ignition cycle.
  2. The driver information center displays the SERVICE SUSPENSION SYSTEM message.
  1. A present DTC will clear on the next consecutive malfunction-free ignition cycle.
  2. A history DTC will clear after 41 consecutive malfunction-free ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

  1. Ignition OFF, disconnect the harness connector at the appropriate Q37 shock absorber actuator.
  2. Perform this setup step in the following order: 2.1. Connect a test lamp and ammeter in series between both Q37 shock absorber actuator harness connector control circuit terminals. 2.2. Ignition ON, with a scan tool, attempt to clear all K19 suspension control module DTC's (codes may not clear).
  3. With a scan tool, command the Damper Actuator to Increase the amperage to approximately 400 mA and Decrease to 0 mA while comparing the ammeter displayed values and scan tool Damper Actuator Command parameter displayed values. Verify the following: The test lamp is illuminated. The ammeter displayed values and scan tool Damper Actuator Command parameter displayed values change and are simultaneously within 15 mA of each other.
  4. If the test lamp is not illuminated and/or the values are not within the specified range, test both control circuits for a short to voltage, short to ground, or open/high resistance. If all circuits test normal, replace the K19 suspension control module.
  5. If all circuits test normal, test or replace the Q37 shock absorber actuator.

Static Test

  1. Ignition OFF, disconnect the harness connector at the appropriate Q37 shock absorber actuator.
  2. Test for 2-3 ohms between the Q37 shock absorber actuator control terminals.
  3. If not within the specified range, replace the Q37 shock absorber actuator.
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC C0595 02

Left Front Acceleration Sensor Circuit Short to Ground

DTC C0595 05

Left Front Acceleration Sensor Circuit High Voltage/Open

DTC C0595 0A

Left Front Acceleration Sensor Circuit Too Slow Transitions

DTC C0600 02

Right Front Acceleration Sensor Circuit Short to Ground

DTC C0600 05

Right Front Acceleration Sensor Circuit High Voltage/Open

DTC C0600 0A

Right Front Acceleration Sensor Circuit Too Slow Transitions

DTC C0605 02

Left Rear Acceleration Sensor Circuit Short to Ground

DTC C0605 05

Left Rear Acceleration Sensor Circuit High Voltage/Open

DTC C0605 0A

Left Rear Acceleration Sensor Circuit Too Slow Transitions

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Left Front Body Acceleration Sensor 5V ReferenceC0870 03C0595 05C0870 07
Right Front Body Acceleration Sensor 5V ReferenceC0870 03C0600 05C0870 07
Rear Body Acceleration Sensor 5V ReferenceC0870 03C0605 05C0870 07
Left Front Body Acceleration Sensor SignalC0595 02C0595 05C0595 05, C0870 07C0595 0A
Right Front Body Acceleration Sensor SignalC0600 02C0600 05C0600 05, C0870 07C0600 0A
Rear Body Acceleration Sensor SignalC0605 02C0605 05C0605 05, C0870 07C0605 0A
Left Front Body Acceleration Sensor Low ReferenceC0595 05
Right Front Body Acceleration Sensor Low ReferenceC0600 05
Rear Body Acceleration Sensor Low ReferenceC0605 05

System voltage is between 9-16 V

C0595 02, C0600 02, and C0605 02

The signal voltage is less than 0.5 V for 1.5 s

C0595 05, C0600 05, and C0605 05

The signal voltage is greater than 4.5 V for 1.5 s

C0595 0A, C0600 0A, and C0605 0A

  1. The number of signal changes is less than specified value for 2.5 s.
  2. Vehicle speed is greater than 30 km/h (19 MPH)
  1. The electronic suspension control is disabled for the duration of the ignition cycle.
  2. The driver information center displays the SERVICE SUSPENSION SYSTEM message.
  1. A present DTC will clear on the next consecutive malfunction-free ignition cycle.
  2. A history DTC will clear after 41 consecutive malfunction-free ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

  1. Ignition ON, verify that DTC C0870 is not present.
  2. If the DTC is present, refer to «DTC C0870»(ref-652233-S22003647682014082300000) to diagnose that DTC prior to this diagnostic.
  3. Ignition OFF, disconnect the harness connector at the appropriate B162 vertical body acceleration sensor.
  4. Ignition OFF, open/close doors, and wait 60 seconds. Test for less than 5 ohms between the low reference circuit terminal 3 and ground.
  5. If greater than the specified value, test the low reference circuit for short to voltage or an open/high resistance. If the circuit tests normal, replace the K19 suspension control module.
  6. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
  7. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K19 suspension control module.
  8. If the parameter is higher than the specified reading, check whether there is a short circuit to voltage in the 5 V reference circuit. If the circuit tests normal, replace the K19 suspension control module.
  9. Verify the scan tool Vertical Body Acceleration parameter is less than -3 m/s 2 .
  10. If greater than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K19 suspension control module.
  11. Install a fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 3.
  12. Verify the scan tool Vertical Body Acceleration parameter is greater than 3 m/s 2 .
  13. If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K19 suspension control module.
  14. If all circuits test normal, replace the B162 vertical body acceleration sensor.
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC C0670 02

Left Front Acceleration or Position Sensor Circuit Short to Ground

DTC C0670 05

Left Front Acceleration or Position Sensor Circuit High Voltage/Open

DTC C0670 0A

Left Front Acceleration or Position Sensor Circuit Too Slow Transitions

DTC C0675 02

Right Front Acceleration or Position Sensor Circuit Short to Ground

DTC C0675 05

Right Front Acceleration or Position Sensor Circuit High Voltage/Open

DTC C0675 0A

Right Front Acceleration or Position Sensor Circuit Too Slow Transitions

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Left Front Wheel Acceleration Sensor 5V ReferenceC0870 03C0670 05C0870 07
Right Front Wheel Acceleration Sensor 5V ReferenceC0870 03C0675 05C0870 07
Left Front Wheel Acceleration Sensor SignalC0670 02C0670 05C0670 05, C0870 07C0670 0A
Right Front Wheel Acceleration Sensor SignalC0675 02C0675 05C0675 05, C0870 07C0675 0A
Left Front Wheel Acceleration Sensor Low ReferenceC0670 05
Right Front Wheel Acceleration Sensor Low ReferenceC0675 05

System voltage is between 9-16 V.

C0670 02 and C0675 02

The signal voltage is less than 0.5 V for 1.5 s.

C0670 05 and C0675 05

The signal voltage is greater than 4.5 V for 1.5 s.

C0670 0A and C0675 0A

  1. The number of signal changes is less than specified value for 2.5 s.
  2. Vehicle speed is greater than 30 km/h (19 mph).
  1. The electronic suspension control is disabled for the duration of the ignition cycle.
  2. The driver information center displays the SERVICE SUSPENSION SYSTEM message.
  1. A present DTC will clear on the next consecutive malfunction-free ignition cycle.
  2. A history DTC will clear after 41 consecutive malfunction-free ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

  1. Ignition ON, verify that DTC C0870 is not present.
  2. If the DTC is present, refer to «DTC C0870»(ref-652233-S22003647682014082300000) to diagnose that DTC prior to this diagnostic.
  3. Ignition OFF, disconnect the harness connector at the appropriate B161 vertical suspension acceleration sensor.
  4. Ignition OFF, open/close doors, and wait 60 seconds. Test for less than 5 ohms between the low reference circuit terminal C and ground.
  5. If greater than the specified value, test the low reference circuit for short to voltage or an open/high resistance. If the circuit tests normal, replace the K19 Suspension Control Module.
  6. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
  7. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K19 suspension control module.
  8. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K19 suspension control module.
  9. Test for 4.8-5.2 V between the signal circuit terminal B and ground.
  10. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K19 suspension control module.
  11. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K19 suspension control module.
  12. If all circuits test normal, replace the B161 vertical suspension acceleration sensor. Verify the DTC does not reset. If the DTC resets, replace the K19 suspension control module
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC C0720 71

Engine Torque Management Feedback Signal Invalid Data

System voltage is between 9-16 V

The suspension control module received invalid serial data from the ECM.

The electronic suspension control is disabled for the duration of the ignition cycle.

  1. The condition for setting the DTC is no longer present.
  2. A history DTC will clear after 41 consecutive malfunction-free ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

  1. Verify that no DTCs are present in the ECM.
  2. If any DTC is present, refer to «DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE»(ref-652232-S23450649802014082300000) to diagnose that DTC prior to this diagnostic.
  3. Replace the K19 suspension control module and verify the DTC does not reset.
  4. If the DTC resets replace the K20 engine control module (ECM).
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC C0870 03

Control Module Voltage Reference Output Circuit Low Voltage

DTC C0870 07

Control Module Voltage Reference Output Circuit High Voltage

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5V ReferenceC0870 03C0595 05, C0600 05, C0605 05, C0670 05, C0675 05C0870 07
Low ReferenceC0595 05, C0600 05, C0605 05, C0670 05, C0675 05

System voltage is between 9-16 V.

C0870 03

The suspension control module detected a short to ground on the 5 V reference circuit for 1.5 s.

C0870 07

The suspension control module detected a short to voltage on the 5 V reference circuit for 1.5 s.

  1. The electronic suspension control is disabled for the duration of the ignition cycle.
  2. The driver information center displays the SERVICE SUSPENSION SYSTEM message.
  1. A present DTC will clear on the next consecutive malfunction-free ignition cycle.
  2. A history DTC will clear after 41 consecutive malfunction-free ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

  1. Ignition OFF, disconnect the harness connectors at all 5 vertical body and suspension acceleration sensors.
  2. Ignition ON, test for 4.8-5.2 V between any one of the 5 V reference circuits terminal and ground.
  3. If less than the specified range, test all of the 5 V reference circuits for a short to ground. If the circuits test normal, replace the K19 suspension control module.
  4. If greater than the specified range, test all of the 5 V reference circuits for a short to voltage. If the circuits test normal, replace the K19 suspension control module.
  5. Test for 4.8-5.2 V between all 5 vertical body and suspension acceleration sensor signal circuits terminals and ground.
  6. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K19 suspension control module.
  7. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K19 suspension control module.
  8. Reconnect each acceleration sensor, one at a time, cycling the ignition OFF and then ON between each connection while observing the scan tool Suspension Position Sensor 5 V Reference parameter. Verify the parameter is between 4.8-5.2 V.
  9. If not within the specified range when a particular acceleration sensor is connected, replace that sensor.

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of any of the suspension subsystems.
  2. Inspect for easily accessible or visible system components for obvious damage or conditions which may cause the symptom.
  3. Inspect for proper tire size and inflation pressure.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «RIDE DIAGNOSIS»(ref-652233-S16376485652014082300000)
  2. «VEHICLE LEADS/PULLS»(ref-652233-S25357115732014082300000)
  3. «SUSPENSION BOTTOMS»(ref-652233-S07394453692014082300000)
  4. «TORQUE STEER»(ref-652233-S39238800852014082300000)
  5. «MEMORY STEER»(ref-652233-S42706118782014082300000)

Noise Diagnosis - Front Suspension

StepActionYesNo
DEFINITION: Any noise emitted from the front of the vehicle that is induced by VEHICLE SPEED or DRIVING TERRAIN as related to the front suspension.
1Did you review the General Description and perform the necessary inspections?Go to Step 2Go to SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS
2Attempt to duplicate the condition. Road test the vehicle. Did you duplicate the condition?Go to Step 3System OK
3Is the noise reactive to vehicle load or speed?Go to Step 4Go to Step 7
4Inspect the tires for the following condition: Proper tire inflation and adjust as necessary-Refer to VEHICLE CERTIFICATION, TIRE PLACARD, ANTI-THEFT, AND SERVICE PARTS ID LABEL . Unusual tire wear-Refer to VIBRATION ANALYSIS - TIRE AND WHEEL . Inspect the wheel nuts for looseness and tighten as necessary. Refer to FASTENER TIGHTENING SPECIFICATIONS . Did you find and correct the condition?Go to Step 14Go to Step 5
5Inspect the front wheel bearings. Refer to WHEEL BEARINGS DIAGNOSIS . Did you find and correct the condition?Go to Step 14Go to Step 6
6Inspect for front axle or transaxle noises. Refer to SYMPTOMS - AUTOMATIC TRANSMISSION . Did you find and correct the condition?Go to Step 14Go to Step 7
7Bounce the front of the vehicle in order to duplicate the noise. Did you duplicate the noise?Go to Step 8Go to Step 9
8Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE . Inspect the front suspension components for looseness. Refer to FASTENER TIGHTENING SPECIFICATIONS . Inspect the front suspension components for damage and repair as necessary. Did you find and correct the condition?Go to Step 14Go to Step 9
9Install a listening device, if existing. Bounce the front of the vehicle, preferably by using a listening device, in order to locate the source of the noise. If necessary road test the vehicle. Repair or replace any damaged components as necessary. Did you find and correct the condition?Go to Step 14Go to Step 10
10Inspect the ball joints and steering components for the following conditions: Lack of lubrication where applicable Looseness in the tie rods-Refer to STEERING LINKAGE OUTER TIE ROD REPLACEMENT . Did you find and correct the condition?Go to Step 14Go to Step 11
11Inspect for damaged shock absorbers. Refer to SUSPENSION STRUT AND SHOCK ABSORBER TESTING - ON VEHICLE . Did you find and correct the condition?Go to Step 14Go to Step 12
12Inspect the front stabilizer shaft and stabilizer shaft links for damage and repair as necessary. Refer to STABILIZER SHAFT REPLACEMENT or STABILIZER SHAFT LINK REPLACEMENT . Did you find and correct the condition?Go to Step 14Go to Step 13
13Inspect for control arm damage and repair as necessary. Refer to LOWER CONTROL ARM REPLACEMENT . Did you find and correct the condition?Go to Step 14
14Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Noise Diagnosis - Rear Suspension

StepActionYesNo
DEFINITION: Any noise emitted from the rear of the vehicle that is induced by VEHICLE SPEED or DRIVING TERRAIN as related to the rear suspension.
1Did you review the General Description and perform the necessary inspections?Go to Step 2Go to SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS
2Attempt to duplicate the condition. Road test the vehicle. Did you duplicate the condition?Go to Step 3System OK
3Is the noise reactive to vehicle load or speed?Go to Step 4Go to Step 6
4Perform the following inspections: Inspect and adjust the tire inflation. Refer to VEHICLE CERTIFICATION, TIRE PLACARD, ANTI-THEFT, AND SERVICE PARTS ID LABEL . Inspect for unusual tire wear. Refer to VIBRATION ANALYSIS - TIRE AND WHEEL . Inspect the wheel nuts for looseness. Refer to FASTENER TIGHTENING SPECIFICATIONS . Did you find and correct the condition?Go to Step 10Go to Step 5
5Inspect the front wheel bearings. Refer to WHEEL BEARINGS DIAGNOSIS . Did you find and correct the condition?Go to Step 10Go to Step 6
6Bounce the rear of the vehicle in order to duplicate the noise. Did you duplicate the noise?Go to Step 7Go to Step 9
7Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE . Inspect the rear suspension components for looseness. Refer to FASTENER TIGHTENING SPECIFICATIONS . Inspect the rear suspension components for damage and repair as necessary. Did you find and correct the condition?Go to Step 10Go to Step 8
8Inspect the rear shock absorber. Refer to SUSPENSION STRUT AND SHOCK ABSORBER TESTING - ON VEHICLE . Did you find and correct the condition?Go to Step 10Go to Step 9
9Install a listening device, if existing. Bounce the rear of the vehicle, preferably by using a listening device, in order to locate the source of the noise. If necessary, road test the vehicle. Repair or replace any defective component, as necessary. Did you find and correct the condition?Go to Step 10System OK
10Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Suspension Strut and Shock Absorber Testing - On Vehicle

StepActionYesNo
1Did you review the General Description and perform the necessary inspections?Go to Step 2Go to SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS
2Verify that the customer's concern is present. Does the vehicle operate normally?System OKGo to Step 3
3IMPORTANT: A light film of oil on the top portion of the shock reservoir is normal. Inspect each strut or shock absorber for external fluid leakage.Is a strut or shock absorber leaking?Go to Step 5Go to Step 4
4Use your hands in order to lift up and push down each corner of the vehicle 3 times. Remove your hands from the vehicle. Locate a shock or strut that exceeds 2 cycles. Did you locate shock or strut that exceeds 2 cycles?Go to Step 5Go to Step 6
5IMPORTANT: Inspect the vehicle trim height in order to correct any possible causes of shock/strut failures. Refer to TRIM HEIGHT INSPECTION . Replace the strut or shock absorber. Refer to STRUT, STRUT COMPONENT, OR SPRING REPLACEMENT or SHOCK ABSORBER REPLACEMENT .Did you complete the repair?Go to Step 6
6Drive the vehicle in order to verify the repair. Did you correct the condition?System OKGo to Step 3
IMPORTANT
A light film of oil on the top portion of the shock reservoir is normal.
IMPORTANT
Inspect the vehicle trim height in order to correct any possible causes of shock/strut failures. Refer to TRIM HEIGHT INSPECTION .

Wheel Bearings Diagnosis

StepActionValuesYesNo
1Did you review the General Description and perform the necessary inspections?Go to Step 2Go to SYMPTOMS - SUSPENSION GENERAL DIAGNOSIS
2Road test the vehicle in order to verify the customer's complaint. Does the vehicle operate normally?System OKGo to Step 3
3Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE . Inspect for tire or wheel damage. Did you find and correct the condition?Go to Step 6Go to Step 4
4Road test the vehicle to verify the location of the wheel bearing noise. Did you locate the source of the wheel bearing noise?Go to Step 5Go to Step 2
5Replace the wheel bearing. Refer to FRONT WHEEL BEARING AND HUB REPLACEMENT or REAR WHEEL BEARING AND HUB REPLACEMENT . Did this complete the repair?Go to Step 6
6Road test the vehicle to verify the repair. Does the vehicle operate normally?System OKGo to Step 3

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