Buick Enclave manuals

Buick Enclave: Specifications, Diagnostic Information and Procedures

Buick Enclave 2008-2017 Service Manual / Steering / Power Steering / Specifications, Diagnostic Information and Procedures

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

Buick Enclave. Power Steering

POWER STEERING PUMP SPECIFICATIONS

Power Steering Pump Specifications

Buick Enclave. Power Steering

SCHEMATIC WIRING DIAGRAMS

POWER STEERING WIRING SCHEMATICS

NV7

Buick Enclave. Power Steering
Fig. 1: NV7 Wiring Schematics

COMPONENT LOCATOR

POWER STEERING GEAR DISASSEMBLED VIEW

Disassembled View

Buick Enclave. Power Steering

Buick Enclave. Power Steering

Buick Enclave. Power Steering

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC CODE INDEX

Buick Enclave. Power Steering

DTC C0450: STEERING ASSIST CONTROL SOLENOID ACTUATOR

Diagnostic Instructions

DTC Descriptors

DTC C0450 00

DTC C0450 5A

Diagnostic Fault Information

Buick Enclave. Power Steering

Circuit/System Description

The electronic brake control module (EBCM) controls the variable effort steering (VES) actuator on the steering gear. The EBCM controls the actuator using 0 to 1.0 Amp. At 0 mph the EBCM supplies 1.0 Amp to the actuator. As the vehicle speed increases the amperage to the actuator decreases.

Conditions for Running the DTC

Conditions for Setting the DTC

A short to voltage, short to ground or open/high resistance is detected on the high control or low control circuit.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Variable Effort Steering System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running, using a scan tool perform the VES Actuator test. Command the actuator while turning the steering wheel, the effort should increase when commanded between 10-100%.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the VES actuator.

2. Ignition ON, Command the VES actuator to 100% with a scan tool.

3. Test for B+ between the high control circuit terminal 2 and ground.

4. Connect a DMM, set on the diode setting, between the low control circuit terminal 1 and ground.

5. Command the VES actuator to 0% with a scan tool. The DMM reading should be greater than 2.5 volts or display O.L.

6. Command the VES actuator to 100% with a scan tool. The DMM reading should be less than 1 volt.

7. If all circuits test normal, test or replace the VES actuator.

Component Testing

1. Ignition OFF, disconnect the harness connector at the VES actuator.

2. Test for 5-10 ohms between the control terminals 1 and 2.

3. Test for infinite resistance between each terminal and the VES actuator housing/case.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

SYMPTOMS - POWER STEERING SYSTEM

IMPORTANT: Review the system description and operation in order to familiarize yourself with the system functions. Refer to Power Steering System Description and Operation.

Visual/Physical Inspection

Symptoms List

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

POWER STEERING SYSTEM TEST

Rack and Pinion System

Buick Enclave. Power Steering
Fig. 3: Testing Rack and Pinion System Pressures

Buick Enclave. Power Steering

Test Description

The numbers below refer to the step numbers on the diagnostic table.

5

This step tests the system for restrictions.

7

This step tests the following components for the following conditions:

8

This step tests the ability of the pump to regulate flow at maximum pressure.

10

This step tests the ability of the pump to regulate flow under normal operating conditions.

12

This step tests the internal components of the pump and the gear.

Power Steering System Test

Buick Enclave. Power Steering

Buick Enclave. Power Steering

Buick Enclave. Power Steering

Buick Enclave. Power Steering

POWER STEERING FLUID LEAKS

Special Tools

For equivalent regional tools, refer to Special Tools.

NOTE:

Some customers may comment on a fluid LEAK or NOISY power steering pump. Upon inspection, the technician may find power steering fluid leaking from the hydraulic power steering system. Use the following inspection procedure in order to diagnose the source of the leak and take appropriate action to correct the condition.

1. Inspect the fluid level in the power steering fluid reservoir. Refer to Checking and Adding Power Steering Fluid. If the fluid level is NOT low, a careful analysis of the condition is necessary to confirm that the type of fluid is actually power steering fluid.

2. Visually inspect the power steering system and components where the fluid has accumulated.

3. Use a clean towel or a rag in order to completely clean off all residual fluid from the power steering components.

CAUTION: Do not clean using brake cleaner or other reactive solvents as these solvents can damage rubber gaskets, seals and bushings.

4. Add 30 cc (1 oz) of GE-28431-6 dye to the power steering fluid.

5. Start the vehicle and warm the steering system by turning to the left steering stop and to the right steering stop 10 times with the weight of the vehicle on the front tires.

6. Turn vehicle engine OFF.

7. Shine a black light on the area where the residual fluid accumulated. Identify the sources of the leaks.

8. Mark all locations of leaks with paint, marker or equivalent.

9. Repair or replace all affected components.

RATTLE, CLUNK OR SHUDDER NOISE FROM THE POWER STEERING SYSTEM

Rattle, Clunk or Shudder Noise from the Power Steering System

Buick Enclave. Power Steering

Buick Enclave. Power Steering

WHINE OR GROWL NOISE FROM THE POWER STEERING SYSTEM

Whine or Growl Noise from the Power Steering System

Buick Enclave. Power Steering

Buick Enclave. Power Steering

STEERING EFFORT TOO EASY IN ONE OR BOTH DIRECTIONS

Steering Effort Too Easy in One or Both Directions

Buick Enclave. Power Steering

Buick Enclave. Power Steering

STEERING EFFORT HARD IN ONE OR BOTH DIRECTIONS

Steering Effort Hard in One or Both Directions

Buick Enclave. Power Steering

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STEERING LINKAGE INNER TIE ROD INSPECTION Special Tools GE-8001 Dial Indicator Set For equivalent regional tools, refer to Special Tools. 1. Turn the ignition key to the ON position with the engine

 Description and Operation

POWER STEERING SYSTEM DESCRIPTION AND OPERATION The hydraulic power steering pump is a constant displacement vane-type pump that provides hydraulic pressure and flow for the power steering gear. The

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 Specifications, Diagnostic Information and Procedures

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