Power Steering System Buick Regal V

Fastener Tightening Specifications

Fastener Tightening Specifications

Power Steering Pump Specifications

Power Steering Pump Specifications

Adhesives, Fluids, Lubricants, and Sealers

Adhesives, Fluids, Lubricants, and Sealers

Scheme 1

Scheme 2

Scheme 3

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit/System Description

If the power steering power pack is replaced, the calibration needs to be learned to the new power steering power pack using a scan tool. The power steering control module will set a DTC, if the required parameters are not learned.

Conditions for Running the DTC

Ignition Switch in OFF, ACCESSORY or ON position, power steering control module in communications mode.

Conditions for Setting the DTC

The soft endstop is not learned by the new power steering control module.

Action Taken When the DTC Sets

DTC C005B is stored in memory.

Conditions for Clearing the DTC

The software endstops need to be learned to the new power steering control module using a scan tool, performing the Configuration/Reset functions Power Steering Softstops Reset and Power Steering Softstops Learn.

Reference Information

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Steering System Description and Operation (Electronic Power Steering)

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. With a scan tool, verify that DTC C005B is not set. If the DTC is set, perform Software Endstop Learning procedure. Refer to «Power Steering Control Module Calibration»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
2. If the DTC resets, replace the steering gear.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Power Steering Assist Motor Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The power steering control module monitors the temperature of the Power Steering System. The power steering control module uses voltage, current levels and input from an internal temperature sensor to calculate an estimated system temperature. If the power steering control module detects a high system temperature event is occurring, the amount of assist is decreased to reduce system temperature, in effort to prevent thermal damage to the power steering components.

1. Ignition ON, engine Running.
2. Power steering system voltage is 9-16 volts.
3. Repetitive steering input applied.

The power steering control module detects a high system temperature.

1. DTC C0176 54 is stored in memory.
2. Steering assist is reduced.

1. A current DTC will clear on the next malfunction-free ignition cycle.
2. A history DTC will clear after 40 consecutive malfunction-free ignition cycles.

Diagnostic Aids

1. DTC C0176 54 does not indicate that a malfunction has occurred. Rather that the power steering control module had to limit current to the power steering motor to avoid thermal damage to the power steering system components. Discuss with the customer about driving conditions when the steering assist was reduced.
2. Ensure that no steering components down stream of the power steering column assembly, such as ball joints, tie rod ends, universal joints, or the steering gear assembly, are mechanically binding.

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Steering System Description and Operation (Electronic Power Steering)

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that the DTC sets outside of the conditions for running and setting. Since most occurrences of this DTC are caused by excessive driver inputs, review with the customer the conditions under which the DTC set. If the DTC set within the normal conditions for running and setting, the power steering is operating as designed.
2. Operate the vehicle within the conditions that the customer experienced, avoiding excessive inputs, and verify the DTC does not reset. If the DTC resets, replace the K43 Power Steering Control Module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Power Steering Assist Motor Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The power steering control module receives the engine speed signal from the engine control module.

The ignition is ON.

The power steering control module detects a invalid engine speed signal on the CAN Bus.

1. DTC C044A is stored in memory.
2. The driver information center displays the SERVICE POWER STEERING warning message.

1. A current DTC will clear on the next malfunction-free ignition cycle.
2. A history DTC will clear after 40 consecutive malfunction-free ignition cycles.

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Steering System Description and Operation (Electronic Power Steering)

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC C044A 71 is not set.

1. If the DTC is set, replace the K43 Power Steering Control Module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Power Steering Assist Motor Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

The actuator is a variable electromagnetic actuator, which consists of one multiple-pole ring-style permanent magnet, with a pole piece, and an electromagnetic coil assembly. By commanding currents between -3 to +3 A through the coils the steering effort will be adapted accordingly.

1. System voltage between 9-16 V
2. Engine running

The variable effort steering detects a short to battery, short to ground or an open circuit in the actuator circuits.

C0450 01

If the coil feedback voltage is measured greater than 8 V during the initialization of the module, the DTC will be set.

C0450 02

If the coil feedback voltage is measured less than 3.4 V during the initialization of the module, the DTC will be set.

C0450 04

If the coil current is measured to be less/greater than 1.0 A from the commanded current, the DTC will be set.

1. DTC C0450 is stored in memory.
2. The fault lamp illuminates or the driver information center displays the service power steering message.
3. The variable effort steering module goes in to shutdown mode.

1. The condition for setting the DTC is no longer present and the DTC is cleared with a scan tool.
2. The variable effort steering automatically clears the history DTC when a current DTC is not detected in 40 consecutive communication wake-up enable cycles.

The vehicle may need to be driven to view full variable power steering solenoid valve commanded and actuator feedback data parameters.

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

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Note. It is recommended that Component Testing is performed before Circuit/System Testing when diagnosing the variable power steering solenoid valve.

1. Ignition OFF, disconnect the harness connector at the M72 Variable Power Steering Solenoid Valve.
2. Ignition ON, test for less than 0.3 V between the control terminals listed below and ground. M72 Variable Power Steering Solenoid Valve, terminal A M72 Variable Power Steering Solenoid Valve, terminal B If greater than the specified value, test the control circuits for a short to voltage. If the circuits test normal, replace the K43 Power Steering Control Module.
3. Ignition OFF, disconnect the negative terminal of the C1 Battery.
4. Test for less than 10 ohms between the control circuit terminals listed below and ground. M72 Variable Power Steering Solenoid Valve, terminal A M72 Variable Power Steering Solenoid Valve, terminal B If greater than the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K43 Power Steering Control Module.
5. Disconnect the harness connector at the K43 Power Steering Control Module. Test for less than 2 ohms between the control circuit terminals listed below: M72 Variable Power Steering Solenoid Valve, terminal A and K43 Power Steering Control Module, terminal 2 M72 Variable Power Steering Solenoid Valve, terminal B and K43 Power Steering Control Module, terminal 3 If greater than the specified value, test the control circuit for an open/high resistance.
6. If all circuits test normal, test or replace the M72 Variable Power Steering Solenoid Valve.
7. Clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify DTC C0450 does not set. If the DTC sets, replace the K43 Power Steering Control Module.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the M72 Variable Power Steering Solenoid Valve.
2. Test for 1.6-3.1 ohms between control terminal A and control terminal B. If not the specified range, replace the M72 Variable Power Steering Solenoid Valve.
3. Test for infinite resistance between each terminal and the M72 Variable Power Steering Solenoid Valve housing case. If not the specified value, replace the M72 Variable Power Steering Solenoid Valve.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Steering Power Variable Control Module Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module replacement, setup and programming

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

If the power steering control module is replaced, the calibration needs to be learned to the new power steering control module using a scan tool.

The ignition is ON.

The calibration is not learned to the new power steering control module.

1. DTC C0456 is stored in memory.
2. The driver information center displays the SERVICE POWER STEERING warning message.
3. No steering assist.

The scan tool function Steering Angle Sensor Centering procedure must be completed successfully.

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Steering System Description and Operation (Electronic Power Steering)

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. With a scan tool, verify that DTC C0456 4B is not set. If the DTC is set, calibrate the steering position sensor and verify the DTC does not reset. Refer to «Power Steering Control Module Calibration»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
2. If the DTC resets, replace the steering gear.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Power Steering Assist Motor Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

C0475 00

The power steering control module continuously monitors the voltage and current levels being commanded to the 3-phase steering assist motor. The power steering control module compares the desired and actual current levels to detect malfunctions in the internal power steering assist motor circuits.

C0475 59

The power steering control module continuously monitors the thermal cycle counter of the steering gear. If the thermal cycle counter exceeds the maximum allowable limit, the steering gear has reached the end of its predetermined lifecycle and must be replaced.

The ignition is ON.

C0475 00

The power steering control module detects a short to ground, short to voltage, or an open/high resistance on any of the internal power steering assist motor circuits.

C0475 59

The power steering control module detects the thermal cycle counter has exceeded the maximum allowable limit indicating that the whole steering gear system must be replaced.

1. The DTC is stored in memory.
2. The driver information center displays the SERVICE POWER STEERING warning message.
3. No steering assist.

C0475 00

1. A current DTC will clear on the next malfunction free ignition cycle.
2. A history DTC will clear after 40 consecutive malfunction free ignition cycles.

C0475 59

This DTC cannot be cleared. The power steering system must be replaced.

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Steering System Description and Operation (Electronic Power Steering)

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

C0475 00

1. Ignition OFF, disconnect the X1 harness connector at the K43 Power Steering Control Module.
2. Test for less than 1 ohms between the ground circuit terminal 1 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the K43 Power Steering Control Module.

C0475 59

Verify that DTC C0475 59 is not set.

1. If the DTC is set, replace the steering gear.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Power Steering Assist Motor Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The power steering control module continuously monitors the motor position sensor voltage signals. The voltage signals of the motor position sensor and the digital torque sensor index current signal are both processed by the power steering control module to detect and calculate the steering wheel angle.

The ignition is ON.

The power steering control module detects a short to ground, short to voltage, or an open/high resistance on any of the internal motor position sensor circuits.

1. No steering assist.
2. The driver information center displays the SERVICE POWER STEERING warning message.

1. A current DTC will clear on the next malfunction-free ignition cycle.
2. A history DTC will clear after 40 consecutive malfunction-free ignition cycles.

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Steering System Description and Operation (Electronic Power Steering)

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC C047A is not set. If the DTC is set, perform the «Steering Angle Sensor Centering»(/buick/regal/v-2009-2013/remont/anti-locktraction-control/#antilock-brake-system__steering-angle-sensor-centering) , then verify the DTC does not reset.
2. If the DTC resets, replace the K43 Power Steering Control Module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Power Steering Assist Motor Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The power steering control module continuously monitors the digital torque sensor's torque and index current signals. As the steering wheel is turned and torsional twist is applied to the steering shaft, the steering input and output shafts are monitored via the torque signal circuit and then processed by the power steering control module to calculate the steering torque.

The ignition is ON.

The power steering control module detects a short to ground, short to voltage, or an open/high resistance on any of the torque sensor circuits.

1. DTC C0545 is stored in memory.
2. The driver information center displays the SERVICE POWER STEERING warning message.
3. No steering assist.

1. A current DTC will clear on the next malfunction-free ignition cycle.
2. A history DTC will clear after 40 consecutive malfunction-free ignition cycles.

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Steering System Description and Operation (Electronic Power Steering)

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC C0545 is not set.

1. If the DTC is set, replace the steering gear containing the torque sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Power Steering Assist Motor Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle identification number (VIN) is programmed into the power steering control module during initial programming of the module.

Ignition ON

The power steering control module is not properly programmed.

1. DTC C0565 is stored in memory.
2. The driver information center displays the SERVICE POWER STEERING warning message.

1. A current DTC will clear on the next malfunction-free ignition cycle.
2. A history DTC will clear after 40 consecutive malfunction-free ignition cycles.

A newly replaced power steering control module can set one or more DTC on its initial ignition ON cycle.

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Steering System Description and Operation (Electronic Power Steering)

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC C0565 is not present. If the DTC is present, program the K43 Power Steering Control Module and verify the DTC does not reset.
2. If the DTC resets, replace the K43 Power Steering Control Module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Power Steering Assist Motor Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The power steering control module continuously monitors the thermal cycle counter of the steering gear. If the power steering control module is replaced, the thermal cycle counter value needs to be transferred from the existing power steering control module over to the new power steering control module using the SPS Electric Power Steering Setup Procedure.

The ignition is ON.

The thermal cycle counter value does not meet the system requirement.

1. DTC C0569 is stored in memory.
2. The driver information center displays the SERVICE POWER STEERING warning message.
3. No Steering assist.

1. A current DTC will clear on the next malfunction free ignition cycle.
2. A history DTC will clear after 40 consecutive malfunction free ignition cycles.

Schematic Reference

Power Steering Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

Power Steering System Description and Operation (Electronic Power Steering)

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify that DTC C0569 3A is not set. If the DTC is set, perform «Power Steering Control Module Programming and Setup (Variable Effort Steering)»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__power-steering-control-module-programming-and) , «Power Steering Control Module Programming and Setup (Electronic Power Steering)»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__power-steering-control-module-programming-and) . If the DTC resets, replace the steering gear.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
2. «Power Steering Assist Motor Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The power steering control module monitors the steering angle sensor signal via the GMLAN serial data circuit. The power steering control module utilizes this signal to determine a center point for Active Return and Soft End Stops. Upon detecting an invalid steering angle sensor signal, the power steering control module will disable Active Return and Soft End Stops, then set a DTC.

Note. To most drivers the loss of Active Return and Soft End Stops may not be noticeable as there is no visual indicator activated on the instrument cluster or driver information display. There is no diagnosable cause with the power steering control module when this DTC is set, DO NOT REPLACE POWER STEERING CONTROL MODULE OR STEERING GEAR DUE TO THIS DTC. For diagnosis of an invalid steering angle sensor signal, refer to Antilock Brake System Diagnostic Information and Procedures.

Ignition ON.

The power steering control module has received on of the following serial data messages listed below from the external steering angle sensor.

1. Steering angle range is exceeded
2. Steering angle sensor is not calibrated
3. Steering angle sensor is initialized
4. Steering angle sensor message: Roll Counter is INVALID
5. Steering angle sensor message: Present Bit is FALSE (not common)
6. Steering angle sensor message: Error Flag is set to TRUE

1. The electronic brake control module disables the stability control for the duration of the ignition cycle.
2. Active Return and Software End Stops are deactivated.

1. A current DTC clears when the diagnostic runs and passes.
2. When the steering angle sensor signal becomes valid, the fault will set to History and can be cleared with a scan tool.

The car should not pull in either direction causing the steering wheel to be OFF center while driving straight ahead on a level surface.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS -- INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. With a scan tool, verify that DTC C0710 71 is not set. If DTC C0710 71 is set Refer to «DTC C0460 or C0710»(/buick/regal/v-2009-2013/remont/anti-locktraction-control/#antilock-brake-system) in Antilock Brake System Diagnostic Information and Procedures. If DTC C0710 71 is not set
3. All OK.

Note. Review the system description and operation in order to familiarize yourself with the system functions. Refer to Power Steering System Description and Operation (Electronic Power Steering) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the power steering system.
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
3. If equipped with hydraulic power steering, inspect for leaking power steering components. If necessary, refer to «Power Steering Fluid Leaks»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks) .
4. If equipped with hydraulic power steering, verify the power steering fluid level is correct. Refer to «Checking and Adding Power Steering Fluid»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
5. If equipped with hydraulic power steering, inspect the power steering fluid for the following indications of contamination: Milky fluid - water Brown fluid - burnt Debris in fluid - plastic or dirt
6. If the hydraulic power steering system is contaminated, flush the power steering system. Refer to «Power Steering System Flushing»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .

Symptoms List

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

1. «Power Steering Fluid Leaks»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__power-steering-fluid-leaks)
2. «Rattle, Clunk, or Shudder Noise from the Power Steering System (Hydraulic Power Steering)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Rattle, Clunk, or Shudder Noise from the Power Steering System (Electronic Power Steering)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
3. «Whine or Growl Noise from the Power Steering System (Electronic Power Steering)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Whine or Growl Noise from the Power Steering System (Hydraulic Power Steering)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system)
4. «Poor Return of Steering Wheel»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__poor-return-of-steering-wheel)
5. «Steering Wheel Surges/Jerks While Turning (Electronic Power Steering)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__steering-wheel-surgesjerks-while-turning-electronic)
6. «Steering Wheel Kickback (Electronic Power Steering)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__steering-wheel-kickback-electronic-power-steering)
7. «Steering Effort Hard or Too Easy in One or Both Directions (Hydraulic Power Steering)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__steering-effort-hard-or-too-easy) , «Steering Effort Hard or Too Easy in One or Both Directions (Electronic Power Steering)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__steering-effort-hard-or-too-easy)

Special Tools

CH-44721 Power Steering Analyzer

For equivalent regional tools, refer to Special Tools .

Scheme 4

Test Description

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

1. 5 This step tests the system for restrictions.
2. 7 This step tests the following components for the following conditions: The power steering pump for internal leaks The power steering pipes for kinks
3. 8 This step tests the ability of the power steering pump to regulate flow at maximum pressure.
4. 10 This step tests the ability of the power steering pump to regulate flow under normal operating conditions.
5. 12 This step tests the internal components of the power steering pump and the steering gear.

Power Steering System Test

Power Steering Fluid Leaks

Special Tools

GE-28431-6 Fluorescent Dye

For equivalent regional tools, refer to Special Tools .

Note. If fluid is found on a manual steering gear or on an electronic power steering gear, do not replace steering gear. Vehicles equipped with these systems do not use hydraulic power steering fluid. The fluid may be assembly fluid or another system fluid. Clean the components and identify the sources of the leaks before attempting to repair or replace any power steering components. Clearly mark all locations of leaks with paint, marker, or equivalent for warranty identification and engineering root cause analysis.

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»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__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.
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 (Electronic Power Steering)

Rattle, Clunk, or Shudder Noise from the Power Steering System (Hydraulic Power Steering)

Special Tools

CH-39570 Chassis Ear

For equivalent regional tools, refer to Special Tools .

Whine or Growl Noise from the Power Steering System (Electronic Power Steering)

Whine or Growl Noise from the Power Steering System (Hydraulic Power Steering)

Poor Return of Steering Wheel

Poor Return of Steering Wheel

Steering Wheel Surges/Jerks While Turning (Electronic Power Steering)

Steering Wheel Surges/Jerks While Turning (Electronic Power Steering)

Steering Wheel Kickback (Electronic Power Steering)

Steering Wheel Kickback (Electronic Power Steering)

Steering Effort Hard or Too Easy in One or Both Directions (Electronic Power Steering)

Steering Effort Hard or Too Easy in One or Both Directions (Electronic Power Steering)

Steering Effort Hard or Too Easy in One or Both Directions (Hydraulic Power Steering)

Steering Effort Hard or Too Easy in One or Both Directions (Hydraulic Power Steering)

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 OFF.
2. With the aid of an assistant, turn the steering wheel to the full stop position and hold the steering wheel in that position until the test is complete. Part of the steering linkage inner tie rod (2) being tested should be inside the steering gear housing. The inner tie rod housing (1) being tested should be inside the steering gear housing and seated against the steering stop.
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
4. If there is not a good location for the GE-8001 dial indicator pointer at the steering gear housing, install a large worm gear hose clamp (3) to the steering gear housing over the larger steering gear boot clamp and align the clamp so that the screw can be a location for the GE-8001 dial indicator pointer.
5. Install the GE-8001 dial indicator between the inner tie rod and the steering gear housing or the worm gear clamp in such a way as to measure the lash between the inner tie rod and the steering gear housing. The lash between the inner tie rod and the steering gear housing is equal to the lash between the inner tie rod and the inner tie rod housing because the inner tie rod housing is inside the steering gear housing during this procedure.
6. Grasping the tire at the 3 o'clock (2) and 9 o'clock (1) positions, gently push in on one side of the tire in order to remove any lash.
7. Zero the GE-8001 dial indicator.
8. On the same side of the tire previously pushed in, gently pull out and measure the lash.
9. Record the measurement shown on the GE-8001 dial indicator.
10. If the measured value exceeds 0.5 mm (0.02 in), replace the inner tie rod. Refer to «Steering Linkage Inner Tie Rod Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
11. Repeat the procedure for the other side.

Steering Linkage Outer Tie Rod Inspection

Special Tools

GE-8001 Dial Indicator Set

For equivalent regional tools, refer to Special Tools .

1. Inspect the outer tie rod seal. If the outer tie rod seal is torn, replace the outer tie rod. Refer to «Steering Linkage Outer Tie Rod Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
2. Raise the side of the vehicle being inspected with a floor jack while maintaining contact between the opposite wheel and the shop floor. Support the lower control arm with a floor jack stand as far outboard as possible and remove the floor jack. Refer to «Lifting and Jacking the Vehicle»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
3. Install the GE-8001 dial indicator between the outer tie rod and the steering knuckle as shown in the graphic. Note that the tire and wheel assembly is shown removed only for clarification of the GE-8001 dial indicator position.
4. Grasping the tire at the 3 o'clock (2) and 9 o'clock (1) positions, gently push in on one side of the tire to remove any lash.
5. Zero the GE-8001 dial indicator.
6. On the same side of the tire previously pushed inwards, gently pull outwards and measure the lash.
7. Record the measurement shown on the GE-8001 dial indicator.
8. If the measured value exceeds 0.5 mm (0.02 in), replace the outer tie rod. Refer to «Steering Linkage Outer Tie Rod Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
9. Repeat the procedure for the other side.

1. Fill the power steering fluid reservoir with fluid to the minimum system level, the FULL COLD level, or the middle of the hash mark on the cap stick fluid level indicator, as applicable.
2. Raise the vehicle until the front wheels are off the ground. Refer to «Lifting and Jacking the Vehicle»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
3. With the key in the ON position and with the engine OFF, turn the steering wheel from stop to stop 12 times. If the vehicle is equipped with longer length power steering hoses, turn the steering wheel from stop to stop 15 to 20 times.
4. Verify the power steering fluid level. Refer to «Checking and Adding Power Steering Fluid»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
5. Start the engine. Rotate the steering wheel from left to right. Inspect the power steering system for signs of cavitation or fluid aeration, like pump noise or whining.
6. Verify the fluid level. Repeat the bleed procedure, if necessary.
7. Lower the vehicle.

Checking and Adding Power Steering Fluid

1. Run the engine until the power steering fluid reaches about 80°C (170°F).
2. Turn the engine OFF.
3. If the power steering fluid reservoir is covered by a shield or a cover, remove the shield or the cover, as applicable.
4. Clean the power steering fluid reservoir and the reservoir cap.
5. Remove the reservoir cap.
6. Inspect the power steering fluid level in the reservoir or on the cap stick, as applicable. Ensure that the fluid level is at the HOT/FULL/MAX mark on the cap stick or on the reservoir, as applicable.
7. Add power steering fluid if necessary. Refer to «Adhesives, Fluids, Lubricants, and Sealers»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__adhesives-fluids-lubricants-and-sealers) .
8. Install the reservoir cap.
9. If you removed a shield or a cover, install the shield or the cover, as applicable.

Note. Do not reuse any drained power steering fluid regardless of appearance or condition.

1. Raise the vehicle until the front wheels are off the ground. Refer to «Lifting and Jacking the Vehicle»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
2. Place a large drain pan under the vehicle in order to collect the draining fluid.
3. Remove the fluid return hose at the power steering fluid reservoir or the pump inlet connection, as applicable.
4. Plug the reservoir return hose inlet connection on the power steering fluid reservoir or the pump, as applicable.
5. Have an assistant maintain the minimum fluid level in the reservoir using clean, new power steering fluid. Refer to «Checking and Adding Power Steering Fluid»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system__checking-and-adding-power-steering-fluid) .
6. With the key in the ON position and with the engine OFF, turn the steering wheel fully to the left and to the right. Continue until the fluid from the return hose runs clear.
7. Remove the plug and install the fluid return hose to the power steering fluid reservoir or the pump inlet connection, as applicable.
8. Bleed the power steering system. Refer to «Power Steering System Bleeding»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
9. Inspect the power steering fluid for the following indications of contamination: Milky fluid - water Brown fluid - burnt Plastic debris or dirt chunks
10. If the fluid is contaminated, repeat steps 3-9.
11. Remove the drain pan.
12. Lower the vehicle.

Scheme 5

Power Steering Fluid Reservoir Replacement (L4)

Scheme 6

Power Steering Pump Pulley Replacement

Scheme 7

Power Steering Pump Replacement

Scheme 8

Steering Linkage Outer Tie Rod Replacement

DT-35910 Drive Axle Seal Clamp Pliers

For equivalent regional tools, refer to Special Tools .

Removal Procedure

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the steering linkage outer tie rod. Refer to «Steering Linkage Outer Tie Rod Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
3. If equipped, remove the steering gear heat shield. Refer to «Steering Gear Heat Shield Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Heat Shield Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
4. Remove the steering linkage inner tie rod nut (5) from the steering linkage inner tie rod.
5. Remove the steering gear boot outer clamp (4).
6. Cut the steering gear boot inner clamp (2). Discard the inner clamp.
7. Remove the steering gear boot (3) from the steering gear (1).
8. Inspect the inner tie rod for evidence of corrosion or contamination. If none is evident, continue with the repair. If corrosion or contamination is evident, replace the steering gear. Refer to «Steering Gear Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .

Installation Procedure

1. Install the steering gear boot (3) to the steering linkage inner tie rod.
2. Install the NEW steering gear boot inner clamp (2) to the steering gear boot.
3. Install the steering gear boot to the steering gear (1). Ensure the steering gear boot is seated in the assembly groove of the steering gear.
4. Use the DT-35910 pliers in order to crimp the steering gear boot inner clamp.
5. Install the steering gear boot outer clamp (1).
6. Install the steering linkage inner tie rod nut (2).
7. If equipped, install the steering gear heat shield. Refer to «Steering Gear Heat Shield Replacement (NJ0 or NJ1)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) , «Steering Gear Heat Shield Replacement (NV7, NXB, NXC, or N40)»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
8. Install the steering linkage outer tie rod. Refer to «Steering Linkage Outer Tie Rod Replacement»(/buick/regal/v-2009-2013/remont/manual-power-steering/#power-steering-system) .
9. Lower the vehicle.

Scheme 9

Power Steering Fluid Cooling Pipe Replacement (L4)

Scheme 10

Power Steering Fluid Reservoir Inlet Hose Replacement (L4)

Scheme 11

Power Steering Fluid Reservoir Outlet Hose Replacement (L4)

Scheme 12

Power Steering Gear Inlet Pipe/Hose Replacement (L4)

Scheme 13

Power Steering Gear Outlet Pipe/Hose Replacement (L4)

Scheme 14

Steering Gear Pipe and Seal Replacement

Scheme 15

Steering Gear Heat Shield Replacement (NJ0 or NJ1)

Scheme 16

Steering Gear Heat Shield Replacement (NV7, NXB, NXC, or N40)

Scheme 17

Steering Power Variable Control Module Replacement

Scheme 18

Steering Gear Replacement (NJ0 or NJ1)

Scheme 19

Steering Gear Replacement (NV7, NXB, NXC, or N40)

Scheme 20

Steering Linkage Inner Tie Rod Replacement

Scheme 21

Steering Gear Drive Coupling Replacement

Scheme 22

Power Steering Assist Motor Replacement

Steering Angle Sensor Centering and Software Endstop Learning

Centering of the steering angle sensor and software endstop learning might be required after certain service procedures are performed. Some of these procedures are as follows

1. Steering angle sensor replacement
2. Steering gear replacement
3. Power steering assist motor replacement
4. Steering column replacement
5. Steering linkage inner tie rod replacement
6. Steering linkage outer tie rod replacement

Note. It is necessary to perform the steering angle sensor centering BEFORE the software endstop learning.

Steering Angle Sensor Centering

For electronic power steering equipped vehicles WITH electronic stability control program and EXTERNAL Steering Angle Sensor, refer to Steering Angle Sensor Centering .

The centering procedure of the internal steering angle sensor (w/o electronic stability program) can be completed with the following steps

Conditions: Front axle measured and set, engine running, vehicle speed 0 km/h (0 MPH), internal steering angle sensor is activated.

1. Using the steering wheel, align the front wheels in the center forward position.
2. Using a scan tool, perform the Configuration/Reset Functions, Steering Wheel Angle Sensor Centering procedure.
3. Steer from the center position slowly 90° to the left.
4. Steer slowly back to the center position and then slowly 90° to the right.
5. Steer slowly back to the center position.
6. Perform the steering movements again.
7. Centering procedure is completed.

Software Endstop Learning

The software endstop learning procedure can be completed with the following steps

Conditions: Front axle measured and set, vehicle speed 0 km/h (0 MPH), internal steering angle sensor is calibrated or external steering angle sensor sends a valid CAN signal.

1. Using a scan tool, perform the Configuration/Reset Functions, Power Steering Softstops Reset procedure and follow the on-screen instructions.
2. Using a scan tool, perform the Configuration/Reset Functions, Power Steering Softstops Learn procedure and follow the on-screen instructions.
3. Software endstop learning procedure is completed.

The power steering system consists of the following components

1. The power steering control module
2. The power steering motor
3. The power steering motor rotational sensor
4. The torque sensor
5. The steering gear (rack and dual pinion)

The rack and dual pinion electric power steering system reduces the amount of effort needed to steer the vehicle utilizing the power steering control module to control the power steering motor to maneuver the steering gear. The power steering control module also uses a combination of the torque sensor, motor rotational sensor, battery voltage circuit and GMLAN serial data circuit to perform the system functions. The power steering control module monitors vehicle speed and engine speed from the engine control module via the GMLAN serial data circuit to determine the amount of steering assist needed to steer the vehicle. At low speeds more assist is provided for easy turning during parking maneuvers. At higher speeds less assist is provided for improved road feel and directional stability.

The power steering control module uses a combination of the torque sensor, motor rotational sensor, vehicle speed, and calculated system temperature inputs to determine the amount of assist needed. The power steering control module continuously monitors the digital torque sensor's torque and index current signals. As the steering wheel is turned and torsional twist is applied to the steering shaft, the steering input and output shafts are monitored via the torque signal circuit and then processed by the power steering control module to calculate the steering torque. The voltage signals of the motor position sensor and the digital torque sensor's index current signal are both processed by the power steering control module to detect and calculate the steering wheel angle.

The power steering control module responds to the change in the digital torque sensor signals as well as the motor rotational sensor's voltage signals by commanding current to the power steering motor. The power steering control module controls the pulse width modulated motor drive circuit to drive the 3-phase motor. The power steering control module and motor assembly is attached to the base of the steering gear housing and assists the steering gear pinion to maneuver the rack from left to right according to turning the steering wheel.

The power steering control module has the ability to calculate an internal system temperature to protect the power steering system from damage caused by high temperature. To reduce a high system temperature, the power steering control module will reduce the amount of current commanded to the power steering motor, which reduces the amount of steering assist. The power steering control module has the ability to detect malfunctions within the electric power steering system. Any malfunction detected that disables steering assist will cause the SERVICE POWER STEERING message to be displayed on the driver information center.

Variable Effort Steering System Description and Operation

The variable effort steering system varies the amount of effort to steer the vehicle as wheel speed changes or lateral acceleration occurs. The electronic brake control module (EBCM) controls an actuator located in the steering rack and pinion. The actuator consists of an electromagnetic coil and a normally open pintle valve. The valve regulates an orifice that bleeds inlet pressure through a return passage to regulate the amount of pressure available for steering assist. The EBCM commands current from 0-1 A to the variable effort steering actuator which varies the amount of effort required to steer the vehicle. At high speeds, 1 A of current is commanded to the variable effort steering actuator and the pintle valve is fully closed which provides minimum pressure for a firm steering feel and directional stability. The variable effort steering system uses the steering wheel position sensor input to calculate lateral acceleration during abrupt driving maneuvers. The system also uses the antilock brake system (ABS) wheel speed sensor inputs to determine vehicle speed. The EBCM is constantly monitoring these inputs to achieve the desired current to the variable effort steering actuator. The EBCM has the ability to detect malfunctions in the variable effort steering actuator or the circuits to the actuator. Any malfunctions detected will cause the variable effort steering outputs to be disabled, and the actuator will return to an open state. The EBCM will command the driver information center to display the SERVICE STEERING SYSTEM warning message via a serial data circuit.

Illustration Tool Number/ Description CH-161-B J-22888-20A J-24319-B KM-161-B SA91100C 7503 Steering Linkage and Tie Rod Puller CH-6321 J-34028 KM-6247 KM-6321 Inner Tie Rod Wrench CH-25033-C J-25033-C KM-J-25033-C 8996415 Pulley Installer CH-25034-C J-25034-C KM-J-25034-C 8996423 Pulley Remover CH-39570 J-39570 SA9217NE Chassis Ear CH-44721 J-44721 KM-354-B Power Steering Analyzer DT-35910 J-35910 MKM-804 Drive Axle Seal Clamp Pliers GE-8001 J-8001 Dial Indicator Set GE-28431-6 J-28431-6 Fluorescent Dye

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Scheme 27

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS -- INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Steering Angle Sensor Centering
• Power Steering Control Module Programming and Setup (Variable Effort Steering)
• Antilock Brake System Schematics
• ABS Description and Operation
• Symptoms - Steering Wheel and Column
• Noise Diagnosis - Front Suspension
• Intermediate Steering Shaft Replacement
• Drive Belt Falls Off and Excessive Wear Diagnosis
• Drive Belt Replacement
• Lifting and Jacking the Vehicle
• Tire and Wheel Removal and Installation
• Wheel Alignment Measurement
• Fastener Caution
• Air Cleaner Assembly Replacement
• Front Wheelhouse Front Liner Replacement
• Wheel Alignment - Steering Wheel Angle and/or Front Toe Adjustment
• Front Bumper Fascia Center Support Replacement - Lower
• Air Cleaner Outlet Duct Replacement
• Battery Tray Replacement
• Instrument Panel Lower Trim Panel Insulator Replacement
• FEP Connectors (Steering Gear)
• DTC C005B
• Variable Effort Steering System Description and Operation
• Power Steering Fluid Leaks
• Checking and Adding Power Steering Fluid
• Poor Return of Steering Wheel
• Steering Wheel Surges/Jerks While Turning (Electronic Power Steering)
• Steering Wheel Kickback (Electronic Power Steering)
• Steering Effort Hard or Too Easy in One or Both Directions (Hydraulic Power Steering)
• Power Steering Pump Specifications
• Steering Linkage Inner Tie Rod Inspection
• Steering Linkage Outer Tie Rod Inspection
• Adhesives, Fluids, Lubricants, and Sealers