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Power Steering System Cadillac ELR I

Manual & Power Steering 11 illustrations ~5469 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Power Steering Assist Motor Bolt (1)8 N.m71 lb in
Steering Gear Bolt (1)
First Pass110 N.m81 lb ft
Final Pass150-165 Degrees
Steering Gear Wiring Harness Bracket Bolt9 N.m80 lb in
Steering Linkage Inner Tie Rod100 N.m74 lb ft
Steering Linkage Inner Tie Rod Nut60 N.m44 lb ft
Steering Linkage Outer Tie Rod Nut
First Pass35 N.m26 lb ft
Final Pass30-45 Degrees
1. Torque-to-yield fastener in use, requires NEW bolt.

Fastener Tightening Specifications

Scheme 1

Scheme 1: Power Steering System
Scheme 1: Power Steering System

Diagnostic Code Index

DTCDescription
DTC C005BDTC C005B Power Steering Softstops Learn
DTC C0176DTC C0176 54 Control Module Temperature Sensor High Temperature
DTC C0475DTC C0475 00 Electric Steering Motor Circuit Malfunction DTC C0475 59 Electric Steering Motor Circuit Protection Time-Out
DTC C047ADTC C047A Electric Steering Motor Position Sensor Circuit
DTC C0544DTC C0544 5A Steering Wheel Angle Sensor Signal Not Plausible
DTC C0545DTC C0545 00 Steering Wheel Torque Sensor Malfunction
DTC C055CDTC C055C 00 Steering Gear Performance Malfunction
DTC C0565DTC C0565 5A Vehicle Identification Number Not Plausible
DTC C0569DTC C0569 3A System Configuration Incorrect Component Installed

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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

Vehicle ON or in SERVICE MODE, 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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#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. Ignition ON.
  2. Verify DTC C005B is not set. If DTC C005B is set Program the K43 Power Steering Control Module. If DTC C005B is not set
  3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Power Steering Assist Motor Replacement»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system)
  2. «Control Module References»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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. Vehicle ON.
  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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#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. «Power Steering Assist Motor Replacement»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
  2. «Control Module References»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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 motor. The power steering control module compares the desired and actual current levels to detect malfunctions in the power steering motor, or the circuits to the motor.

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 its end of life 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 motor circuits.

C0475 59

The power steering control module detects the thermal cycle counter has exceeded the maximum allowable limit and 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.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#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 C0475 is not set. If the DTC is set Replace the K43 power steering control module. If the DTC is not set
  2. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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 vehicle is ON or in SERVICE MODE.

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, or a plausibility error as a result of a mismatch between the steering angle data from the internal steering angle sensor in the gear versus the external steering angle sensor data on the steering column.

  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.

Diagnostics Aids

A communication error between the Electronic Brake Control Module and Power Steering Control Module can cause DTC C047A to set in history and display Service Power Steering warning message. Do not replace the steering gear or power steering control module if DTC C047A is set in history. If DTC C047A is current, follow the Circuit/System Testing for proper diagnosis.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#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 C0710»(/cadillac/elr/i-2013-2015/remont/anti-locktraction-control/#antilock-brake-system) in Anitlock Brake System Diagnostic Information and Procedures. If DTC C0710 71 is not set
  3. With a scan tool verify that DTC C047A is not set. If the DTC is set Refer to Circuit/System Testing below. If the DTC is not set
  4. All OK.

Circuit/System Testing

  1. Verify that the connector at the B137 Power Steering Shaft Torque Sensor is not damaged or have water intrusion/corrosion. The B137 Power Steering Shaft Torque Sensor connector is not OK Replace the steering gear. The B137 Power Steering Shaft Torque Sensor connector is OK
  2. With a scan tool perform the Power Steering Control Module Calibration procedure Steering Angle Sensor Centering and Software Endstop Learning. Refer to «Power Steering Control Module Calibration»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system) .
  3. Verify that DTC C047A does not set. If the DTC does set Replace the K43 Power Steering Control Module. If the DTC does not set
  4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Control Module References»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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 steering wheel angle sensor. The steering wheel angle sensor indicates the direction in which the driver intends to go.

The power steering control module has a center detection algorithm that compares the reading of the steering angle sensor to the direction based on other vehicle sensors that the vehicle is travelling to determine if the steering angle reading is plausible.

Ignition ON.

The power steering control module detects a not plausible signal from the steering wheel angle sensor.

The power steering control module detected that the steering angle sensor reading and the direction of the vehicle exceeds 329 degrees.

  1. DTC C0544 is stored in memory.
  2. The driver information center displays the SERVICE POWER STEERING warning message.

A history DTC will clear after 40 consecutive malfunction free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#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 no other DTCs are set except for C0544. If any other DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no other DTCs are set
  3. With a scan tool, verify that the Steering Wheel Angle parameter is zero degrees or near zero degrees with the front tire/wheels in the straight ahead position. If the Steering Wheel Angle parameter is not zero degrees or near zero degrees Perform the Steering Angle Sensor Centering. Refer to «Steering Angle Sensor Centering»(/cadillac/elr/i-2013-2015/remont/anti-locktraction-control/#antilock-brake-system__steering-angle-sensor-centering) Verify that DTC C0544 is not set. If the DTC is set, replace the steering gear. If the DTC is not set All OK. If the Steering Wheel Angle parameter is zero degrees or near zero degrees
  4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Control Module References»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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 internal motor position 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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#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 00 is not set.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Control Module References»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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 verifies the mechanical friction of the steering gear. If the friction is too high the clutch between motor and rack slips and the internal angle is not longer valid.

Ignition ON.

The DTC is set when the mechanical friction of the steering gear is too high.

  1. DTC C055C is stored in memory.
  2. No steering assist.

A history DTC will clear after 40 consecutive malfunction free ignition cycles.

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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#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 C055C is not set. If the DTC is set Verify that no steering components down stream of the power steering column assembly are mechanically binding. Refer to «Steering Effort Hard or Too Easy in One or Both Directions»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system__steering-effort-hard-or-too-easy) If steering components are mechanically binding, replace the mechanically binding steering components. If no steering components are mechanically binding, replace the Steering Gear. If the DTC is not set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Control Module References»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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.

Vehicle in Service Mode

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 Vehicle in Service Mode cycle.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#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. «Control Module References»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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 vehicle is ON or in SERVICE MODE.

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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/cadillac/elr/i-2013-2015/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Vehicle ON or in SERVICE MODE.
  2. Verify that DTC C0569 3A is not set. If the DTC is set, perform «Power Steering Control Module Programming and Setup»(/cadillac/elr/i-2013-2015/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. «Power Steering Assist Motor Replacement»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system) for power steering control module replacement
  2. «Control Module References»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for power steering control module programming and setup

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.

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

  1. «Rattle, Clunk, or Shudder Noise from the Power Steering System»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system)
  2. «Whine or Growl Noise from the Power Steering System»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system)
  3. «Increase in Effort While Turning Steering Wheel»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system__increase-in-effort-while-turning-steering)
  4. «Poor Return of Steering Wheel»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system__poor-return-of-steering-wheel)
  5. «Steering Wheel Surges/Jerks While Turning»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system__steering-wheel-surgesjerks-while-turning)
  6. «Steering Wheel Kickback»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system__steering-wheel-kickback)
  7. «Steering Effort Hard or Too Easy in One or Both Directions»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system__steering-effort-hard-or-too-easy)
StepActionYesNo
1Did you review the Power Steering System Description and Operation and perform the necessary inspections?Go to Step 2Go to Symptoms - Steering Wheel and Column
2Verify a rattle noise is present by driving the vehicle on a rough road. Verify a clunk noise is present by turning the steering wheel to the left and to the right several times with the key in the ON position. Is a rattle or a clunk noise present?Go to Step 3System OK
3Inspect the steering gear for the proper installation. Is the steering gear installation incorrect?Go to Step 6Go to Step 4
4Inspect the intermediate steering shaft. Is the intermediate steering shaft worn?Go to Step 8Go to Step 5
5Inspect the front suspension. Refer to Noise Diagnosis - Front Suspension . Is the front suspension worn?Go to Step 7Go to Step 3
6Install the steering gear correctly. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement . Did you complete the repair?Go to Step 9
7Replace the worn front suspension component that is causing the noise. Did you complete the repair?Go to Step 9
8Replace the intermediate steering shaft. Refer to Intermediate Steering Shaft Replacement . Did you complete the repair?Go to Step 9
9Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3

Rattle, Clunk, or Shudder Noise from the Power Steering System

StepActionYesNo
1Did you review the Power Steering System Description and Operation and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that a whine or growl noise is present. Is the steering gear quiet?System OKGo to Step 3
3Perform the Diagnostic System Check - Vehicle. Refer to Diagnostic System Check - Vehicle Are any codes present?Go to Diagnostic Trouble Code (DTC) List - VehicleGo to Step 4
4Inspect the power steering gear fasteners for looseness. Is the steering gear loose?Go to Step 13Go to Step 5
5Inspect the power steering gear for loose or worn bushings. Are the steering gear bushings loose or worn?Go to Step 14Go to Step 6
6Verify the steering column dash outer seal is in position. Is the steering column dash outer seal damaged or out of position?Go to Step 15Go to Step 7
7Verify the steering column dash inner seal is in position. Is the steering column dash inner seal damaged or out of position?Go to Step 16Go to Step 8
8Inspect the power steering assist motor for a whine or growl noise using the CH-39570 chassis ear. Is the noise present at the power steering assist motor?Go to Step 19Go to Step 9
9Inspect the steering gear for a whine or growl noise using the CH-39570 chassis ear. Is the noise present at the steering gear?Go to Step 20Go to Step 10
10Disconnect the steering linkage outer tie rods and individually turn each steering knuckle and strut assembly inboard and outboard. Refer to Steering Linkage Outer Tie Rod Replacement . Is the noise present?Go to Step 11Go to Step 12
11Disconnect the lower control arms from the steering knuckles and rotate each steering knuckle and strut assembly inboard and outboard. Refer to Lower Control Arm Replacement . Is the noise present?Go to Step 17Go to Step 18
12NOTE: Position the wheels straight ahead. Do not rotate the steering wheel more than one complete revolution from center for this procedure. Disconnect the intermediate steering shaft from the steering column. Refer to Intermediate Steering Shaft Replacement . Note the position of the steering wheel and rotate the steering wheel ONE revolution in both directions. Rotate the steering wheel back to the original position. Is the noise present?Go to Symptoms - Power Steering SystemGo to Step 20
13Replace the steering gear fasteners. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement . Did you complete the repair?Go to Step 21
14Replace the steering gear bushings. Refer to Steering Gear Bushing Replacement . Did you complete the repair?Go to Step 21
15Reposition or replace the steering column dash outer seal. Refer to Steering Column Dash Outer Seal Replacement . Did you complete the repair?Go to Step 21
16Reposition or replace the steering column dash inner seal. Refer to Steering Column Dash Inner Seal Replacement . Did you complete the repair?Go to Step 21
17Replace the front suspension strut mount. Refer to Strut, Strut Component, or Spring Replacement . Did you complete the repair?Go to Step 21
18Replace the lower control arm. Refer to Lower Control Arm Replacement . Did you complete the repair?Go to Step 21
19Replace the power steering assist motor. Refer to Power Steering Assist Motor Replacement . Did you complete the repair?Go to Step 21
20Replace the steering gear. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement . Did you complete the repair?Go to Step 21
21Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 2
NOTE
Position the wheels straight ahead. Do not rotate the steering wheel more than one complete revolution from center for this procedure.

Whine or Growl Noise from the Power Steering System

Increase in Effort While Turning Steering Wheel

StepActionYesNo
1Did you review the Power Steering System Description and Operation and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that there is an increase in effort while turning the steering wheel. Does the system operate normally?System OKGo to Step 3
3Check for the following tire related conditions: Incorrect tire inflation Improper tire size Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label . Did you find and correct the condition?Go to Step 10Go to Step 4
4Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Inspect the steering linkage outer tie rods for wear or a binding condition. Are the steering linkage outer tie rods worn or binding?Go to Step 7Go to Step 5
5Check for a worn or binding intermediate shaft. Is the intermediate shaft worn or binding?Go to Step 8Go to Step 6
6Inspect the intermediate steering shaft for wear or a binding condition. Is the intermediate steering shaft worn or binding?Go to Step 9System OK
7Replace the steering linkage outer tie rod/s. Refer to Steering Linkage Outer Tie Rod Replacement . Did you complete the repair?Go to Step 10
8Replace the intermediate steering shaft. Refer to Intermediate Steering Shaft Replacement . Did you complete the repair?Go to Step 10
9Replace the steering gear. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement . Did you complete the repair?Go to Step 10
10Operate the system in order to verify the repair. Did you correct the condition?System OK

Increase in Effort While Turning Steering Wheel

Poor Return of Steering Wheel

StepActionYesNo
DEFINITION: After completing a turn, extra steering input is required for the steering wheel to return to center.
1Did you review the Power Steering System Description and Operation and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that poor return of the steering wheel is present. Does the system operate normally?System OKGo to Step 3
3Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Lubricate the steering linkage outer tie rods and front suspension ball joints, if applicable. Inspect the front suspension system for worn or damaged components. Repair as necessary. Did you find and correct the condition?Go to Step 12Go to Step 4
4Rotate the steering wheel ONE revolution in both directions. Rotate the steering wheel back to the original position. Was the steering wheel abnormally difficult to rotate in either direction?Go to Step 5Go to Step 10
5NOTE: Position the wheels straight ahead. Do not rotate the steering wheel more than one complete revolution from center for this procedure. Disconnect the intermediate steering shaft from the steering column. Note the position of the steering wheel and rotate the steering wheel ONE revolution in both directions. Rotate the steering wheel back to the original position. Was the steering wheel abnormally difficult to rotate in either direction?Go to Step 11Go to Step 6
6Inspect the intermediate steering shaft for wear or a binding condition. Did you find and complete the repair?Go to Step 12Go to Step 7
7Remove the front tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation . Disconnect both steering linkage outer tie rods from the steering knuckles. Use your hands in order to move the steering linkage outer tie rod studs. If abnormally difficult to move, replace the steering linkage outer tie rod/s. Did you find and complete the repair?Go to Step 12Go to Step 8
8Turn each steering knuckle and strut assembly inboard and outboard to inspect for binding strut components, ball joints or drive axles. Repair or replace any abnormally stiff or loose components. Did you find and complete the repair?Go to Step 12Go to Step 9
9Inspect for binding in the steering gear. If binding is present, repair or replace the steering gear. Did you find and complete the repair?Go to Step 12Go to Step 10
10Inspect the wheel alignment and adjust as necessary. Refer to Wheel Alignment Measurement . Did you find and complete the repair?Go to Step 12
11Inspect the steering column for binding. If binding is present, repair or replace the steering column as necessary. Did you find and complete the repair?Go to Step 12
12Operate the system in order to verify the repair. Did you correct the condition?System OK
NOTE
Position the wheels straight ahead. Do not rotate the steering wheel more than one complete revolution from center for this procedure.

Poor Return of Steering Wheel

Steering Wheel Surges/Jerks While Turning

StepActionYesNo
1Did you review the Power Steering System Description and Operation and perform the necessary inspections?Go to Step 2Go to Symptoms - Power Steering System
2Verify that the steering wheel surges or jerks while turning. Does the steering wheel surge or jerk while turning?Go to Step 3System OK
3Inspect the front suspension for worn or binding components. Did you find and correct the condition?Go to Step 15Go to Step 4
4Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Inspect the steering linkage outer tie rods for wear or a binding condition. Are the steering linkage outer tie rods worn or binding?Go to Step 10Go to Step 5
5Inspect the intermediate steering shaft for wear or a binding condition. Is the intermediate steering shaft worn or binding?Go to Step 11Go to Step 6
6Inspect the steering gear for wear or a binding condition. Is the steering gear worn or binding?Go to Step 12Go to Step 7
7Inspect the steering column for wear or a binding condition. Is the steering column worn or binding?Go to Step 13Go to Step 8
8Inspect the power steering assist motor for an indication of excessive heat. Does the power steering assist motor appear to be overheated?Go to Step 9Go to Step 14
9NOTE: Do not perform excessive parking lot maneuvers during testing. Excessive parking lot maneuvers can cause the power steering assist motor to heat up. Allow the power steering assist motor to cool and retest the system.Did you correct the condition?Go to Step 15Go to Step 14
10Replace the steering linkage outer tie rod/s. Refer to Steering Linkage Outer Tie Rod Replacement . Did you complete the repair?Go to Step 15
11Replace the intermediate steering shaft. Refer to Intermediate Steering Shaft Replacement . Did you complete the repair?Go to Step 15
12Replace the steering gear. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement . Did you complete the repair?Go to Step 15
13Replace the steering column. Refer to Steering Column Replacement . Did you complete the repair?Go to Step 15
14Replace the power steering assist motor. Refer to Power Steering Assist Motor Replacement . Did you complete the repair?Go to Step 15
15Operate the system in order to verify the repair. Did you correct the condition?System OKGo to Step 3
NOTE
Do not perform excessive parking lot maneuvers during testing. Excessive parking lot maneuvers can cause the power steering assist motor to heat up.

Steering Wheel Surges/Jerks While Turning

Steering Wheel Kickback

ConditionAction
The steering column mounting fasteners are loose.Tighten the steering column mounting fasteners to specification.
The steering gear is loosely mounted.Tighten the steering gear mounting fasteners to specification.
The steering linkage inner and/or outer tie rods are loose or damaged.Inspect the steering linkage inner and outer tie rods. Refer to Steering Linkage Inner Tie Rod Replacement , and Steering Linkage Outer Tie Rod Replacement .

Steering Wheel Kickback

Steering Effort Hard or Too Easy in One or Both Directions

ConditionAction
The battery power is low.Ensure proper battery voltage.
One or both of the steering column dash seals are binding.Adjust or replace the steering column dash seal/s and/or intermediate steering shaft. Refer to Steering Column Dash Inner Seal Replacement , Steering Column Dash Outer Seal Replacement , and Intermediate Steering Shaft Replacement .
The intermediate steering shaft joints and/or fasteners are worn or binding.Tighten or replace the intermediate steering shaft joints and/or fasteners. Refer to Intermediate Steering Shaft Replacement .
The steering gear is binding.Replace the steering gear. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement .
The upper steering shaft is bent.Replace the steering column. Refer to Steering Column Replacement .
The connectors to the power steering assist motor are damaged or disconnected.Verify the connectors are properly connected. Verify the connectors are not damaged. If the connectors are damaged, replace the connectors.
The steering gear sensor wire is damaged.Replace the steering gear. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement .
The power steering control module is malfunctioning.Confirm the DTC. Replace the power steering assist motor. Refer to Power Steering Assist Motor Replacement .
The power steering assist motor shaft is binding.Confirm the DTC. Replace the power steering assist motor. Refer to Power Steering Assist Motor Replacement .

Steering Effort Hard or Too Easy in One or Both Directions

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»(/cadillac/elr/i-2013-2015/remont/hoistjack/#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»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/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»(/cadillac/elr/i-2013-2015/remont/hoistjack/#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»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system) .
  9. Repeat the procedure for the other side.

Scheme 2

Scheme 2: Steering Linkage Outer Tie Rod Replacement
Scheme 2: Steering Linkage Outer Tie Rod Replacement
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the front tire and wheel assembly. Refer to Tire and Wheel Removal and Installation .
1Steering Linkage Inner Tie Rod Nut Procedure Place match marks on the steering linkage inner tie rod nut and the steering linkage inner tie rod. During installation, align the match marks. NOTE: Do not tighten the steering linkage inner tie rod nut during installation. Tighten the nut after adjusting the front toe. Tighten 60 N.m (44 lb ft)
2Steering Linkage Outer Tie Rod Nut CAUTION: Refer to Fastener Caution . Tighten 35 N.m (26 lb ft) + 30-45 degrees
3Steering Linkage Outer Tie Rod CAUTION: Do not free the ball stud by using a pickle fork or a wedge-type tool. Damage to the seal or bushing may result. Procedure Use the CH-161-B puller to disconnect the steering linkage outer tie rod from the steering knuckle. Clean the tapered surface of the steering knuckle. Inspect the steering linkage inner tie rod for bent or damaged threads. Repair or replace the tie rod if needed. Refer to Steering Linkage Inner Tie Rod Replacement . Measure and adjust the front toe. Refer to Wheel Alignment - Steering Wheel Angle and/or Front Toe Adjustment . Special Tools CH-161-B Bearing Puller For equivalent regional tools, refer to Special Tools .
NOTE
Do not tighten the steering linkage inner tie rod nut during installation. Tighten the nut after adjusting the front toe.
CAUTION
Refer to Fastener Caution .
CAUTION
Do not free the ball stud by using a pickle fork or a wedge-type tool. Damage to the seal or bushing may result.

Steering Linkage Outer Tie Rod Replacement

Scheme 3

Scheme 3: Steering Gear Boot Replacement
Scheme 3: Steering Gear Boot Replacement
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the steering linkage outer tie rod. Refer to Steering Linkage Outer Tie Rod Replacement .
1Steering Linkage Inner Tie Rod Nut
2Steering Gear Boot Outer Clamp
3Steering Gear Boot Inner Clamp Procedure Cut the steering gear boot inner clamp. Discard the clamp. Use the DT-35910 pliers to install a NEW steering gear boot inner clamp. Special Tools DT-35910 Drive Axle Boot Clamp Pliers For equivalent regional tools, refer to Special Tools .
4Steering Gear Boot Procedure After removing the steering gear boot, inspect the steering linkage 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 Electric Dual Pinion Rack and Pinion Steering Gear Replacement . Install the steering gear boot and ensure the boot is seated in the assembly groove of the steering gear before installing the steering gear boot clamps.

Steering Gear Boot Replacement

Removal Procedure

  1. Lock the steering column in the straight-ahead position.
  2. Disconnect the intermediate steering shaft (3) from the steering gear. Refer to «Intermediate Steering Shaft Replacement»(/cadillac/elr/i-2013-2015/remont/steering-column-switches/#steering-wheel-and-steering-column) .
  3. Remove the steering column dash inner seal (1). Refer to «Steering Column Dash Inner Seal Replacement»(/cadillac/elr/i-2013-2015/remont/steering-column-switches/#steering-wheel-and-steering-column) .
  4. Install the engine support fixture (2). Refer to «Engine Support Fixture»(ref-636500-S28245195062014070700000) .
  5. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/elr/i-2013-2015/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
  6. Disconnect the steering linkage outer tie rods (3) from the steering knuckles. Refer to «Steering Linkage Outer Tie Rod Replacement»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system) .
  7. Disconnect the front stabilizer shaft links (2) from the front stabilizer shaft. Refer to «Stabilizer Shaft Link Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-front/#front-suspension-system) .
  8. Disconnect the front lower control arms (2) from the steering knuckles. Refer to «Lower Control Arm Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-front/#front-suspension-system) .
  9. Remove the catalytic convertor (5). Refer to «Catalytic Converter Replacement»(/cadillac/elr/i-2013-2015/remont/exhaust/#engine-exhaust-system) .
  10. Disconnect the electrical connector on the steering gear and disconnect the wiring harness clip from the steering gear housing.
  11. Remove the wiring harness bracket bolts from the steering gear. Leave the bracket attached to the wiring harness and position it out of the way.
  12. Remove the rear transmission mount through bolt (2). Refer to «Transmission Mount Bracket Replacement - Rear»(/cadillac/elr/i-2013-2015/remont/automatic-trans/#automatic-transmission-4et50-repair-instructions-on-vehicle) .
  13. Position adjustable jackstands underneath the left and right sides of the rear of the drivetrain and front suspension frame.
  14. Lower the vehicle until the drivetrain and front suspension frame is resting lightly on the jackstands.
  15. Loosen the drivetrain and front suspension frame front bolts (1). Refer to «Drivetrain and Front Suspension Frame Replacement»(/cadillac/elr/i-2013-2015/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  16. Remove the drivetrain and front suspension frame rear bolts (1, 2). Refer to «Drivetrain and Front Suspension Frame Replacement»(/cadillac/elr/i-2013-2015/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  17. Raise the vehicle while the drivetrain and front suspension frame (3) rests on the jackstands. Do not allow the gap between the body and rear of the frame to exceed a maximum of 50 mm (2 in).
  18. Finish removing the front stabilizer shaft (2). Refer to «Stabilizer Shaft Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-front/#front-suspension-system) .
  19. Remove the steering gear nuts (1), washers (2) and bolts (3) from the steering gear (4). DISCARD the bolts.
  20. Remove the steering gear (4) from the left side of the vehicle.
  21. Transfer components as necessary.

Installation Procedure

  1. Position the steering gear (4) on the drivetrain and front suspension frame through the left side of the vehicle.
  2. Install the NEW steering gear bolts (3), washers (2) and nuts (1) and tighten the bolts to 110 N.m (81 lb ft) + 150-165 degrees.
  3. Install the front stabilizer shaft (2) onto the drivetrain and front suspension frame. Refer to «Stabilizer Shaft Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-front/#front-suspension-system) .
  4. Lower the vehicle until the gap between the drivetrain and front suspension frame (3) and body is approximately 12 mm (0.5 in).
  5. Install the drivetrain and front suspension frame rear bolts (1, 2). Refer to «Drivetrain and Front Suspension Frame Replacement»(/cadillac/elr/i-2013-2015/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  6. Tighten the drivetrain and front suspension frame front bolts (1). Refer to «Drivetrain and Front Suspension Frame Replacement»(/cadillac/elr/i-2013-2015/remont/frames-subframes-crossmembers/#frame-and-underbody) .
  7. Remove the jackstands from underneath the vehicle.
  8. Install the rear transmission mount through bolt (2). Refer to «Transmission Mount Bracket Replacement - Rear»(/cadillac/elr/i-2013-2015/remont/automatic-trans/#automatic-transmission-4et50-repair-instructions-on-vehicle) .
  9. Route the steering gear wiring harness in the position it was in before removal.
  10. Tighten the steering gear wiring harness bracket bolts to 9 N.m (80 lb in).
  11. Connect the electrical connector on the steering gear and connect the wiring harness clip on the steering gear housing.
  12. Install the catalytic convertor (5). Refer to «Catalytic Converter Replacement»(/cadillac/elr/i-2013-2015/remont/exhaust/#engine-exhaust-system) .
  13. Connect the front lower control arms (2) to the steering knuckles. Refer to «Lower Control Arm Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-front/#front-suspension-system) .
  14. Connect the front stabilizer shaft links (2) to the front stabilizer shaft. Refer to «Stabilizer Shaft Link Replacement»(/cadillac/elr/i-2013-2015/remont/suspension-front/#front-suspension-system) .
  15. Connect the steering linkage outer tie rods (3) to the steering knuckles. Refer to «Steering Linkage Outer Tie Rod Replacement»(/cadillac/elr/i-2013-2015/remont/manual-power-steering/#power-steering-system) .
  16. Remove the engine support fixture (2). Refer to «Engine Support Fixture»(ref-636500-S28245195062014070700000) .
  17. Install the steering column dash inner seal (1). Refer to «Steering Column Dash Inner Seal Replacement»(/cadillac/elr/i-2013-2015/remont/steering-column-switches/#steering-wheel-and-steering-column) .
  18. Connect the intermediate steering shaft to the steering gear. Refer to «Intermediate Steering Shaft Replacement»(/cadillac/elr/i-2013-2015/remont/steering-column-switches/#steering-wheel-and-steering-column) .
  19. Program the power steering control module. Refer to «Power Steering Control Module Programming and Setup»(/cadillac/elr/i-2013-2015/remont/communication-devices/#programming-and-setup-all-systems__power-steering-control-module-programming-and) .
  20. Measure and adjust the front toe. Refer to «Wheel Alignment - Steering Wheel Angle and/or Front Toe Adjustment»(/cadillac/elr/i-2013-2015/remont/wheel-alignment/#wheel-alignment-system__wheel-alignment-steering-wheel-angle) .

Scheme 4

Scheme 4: Steering Gear Bushing Replacement
Scheme 4: Steering Gear Bushing Replacement
CalloutComponent Name
Preliminary Procedures Remove the steering gear. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement .
1Steering Gear Bushing - Lower Procedure Remove and DISCARD the lower steering gear bushing using suitable pliers. Lubricate the NEW lower steering gear bushing with a mild soap to aid in installation.
2Steering Gear Bushing - Upper Procedure Remove and DISCARD the upper steering gear bushing using a suitable punch and soft rubber mallet. Lubricate the NEW upper steering gear bushing with a mild soap to aid in installation.

Steering Gear Bushing Replacement

Scheme 5

Scheme 5: Steering Linkage Inner Tie Rod Replacement
Scheme 5: Steering Linkage Inner Tie Rod Replacement
CalloutComponent Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the steering gear boot. Refer to Steering Gear Boot Replacement . After removing the steering gear boot, inspect the steering linkage 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 Electric Dual Pinion Rack and Pinion Steering Gear Replacement .
1Steering Linkage Inner Tie Rod CAUTION: Refer to Component Fastener Tightening Caution . Procedure Place a wrench on the flats of the steering linkage inner tie rod housing. Rotate the steering linkage inner tie rod housing counterclockwise to remove the steering linkage inner tie rod from the steering gear rack. Rotate the steering linkage inner tie rod housing clockwise to install the steering linkage inner tie rod to the steering gear rack. Use the CH-6321 wrench and a torque wrench to tighten the steering linkage inner tie rod to specification. Measure and adjust the front toe. Refer to Wheel Alignment - Steering Wheel Angle and/or Front Toe Adjustment . Tighten 100 N.m (74 lb ft) Special Tools CH-6321 Tie Rod Wrench For equivalent regional tools, refer to Special Tools .

Steering Linkage Inner Tie Rod Replacement

Scheme 6

Scheme 6: Steering Gear Drive Coupling Replacement
Scheme 6: Steering Gear Drive Coupling Replacement
CalloutComponent Name
Preliminary Procedure Remove the power steering assist motor. Refer to Power Steering Assist Motor Replacement .
1Steering Gear Drive Coupling NOTE: The steering gear drive coupling connects the power steering assist motor to the steering gear.
NOTE
The steering gear drive coupling connects the power steering assist motor to the steering gear.

Steering Gear Drive Coupling Replacement

Scheme 7

Scheme 7: Power Steering Assist Motor Replacement
Scheme 7: Power Steering Assist Motor Replacement
CalloutComponent Name
CAUTION: Electrostatic discharge (ESD) can damage many solid-state electrical components. ESD susceptible components may or may not be labeled with the ESD symbol. Handle all electrical components carefully. Use the following precautions in order to avoid ESD damage: Touch a metal ground point in order to remove your body's static charge before servicing any electronic component; especially after sliding across the vehicle seat. Do not touch exposed terminals. Terminals may connect to circuits susceptible the ESD damage. Do not allow tools to contact exposed terminals when servicing connectors. Do not remove components from their protective packaging until required to do so. Avoid the following actions unless required by the diagnostic procedure: Jumpering or grounding of the components or connectors. Connecting test equipment probes to components or connectors. Connect the ground lead first when using test probes. Ground the protective packaging of any component before opening. Do not rest solid-state components on metal workbenches, or on top of TVs, radios, or other electrical devices. Preliminary Procedures Perform the strategy based diagnosis. Performing the strategy based diagnostics includes reviewing related bulletins, preliminary information and diagnostics. Refer to Strategy Based Diagnosis . Capture the key cycle count from the old steering gear control module. If the key cycle count from the old module is not captured, it will not be possible to flash the new module. Refer to Power Steering Control Module Programming and Setup . Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Remove the steering gear. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement .
1Power Steering Assist Motor Bolt (Qty: 3) WARNING: This component is equipped with torque-to-yield fasteners. Install a NEW torque-to-yield fastener when installing this component. Failure to replace the torque-to-yield fastener could cause bodily injury and damage to the vehicle or component. CAUTION: Refer to Fastener Caution . Procedure Remove the power steering assist motor bolts. DISCARD the bolts. Install the NEW power steering assist motor bolts. Tighten 8 (71 lb in)
2Power Steering Assist Motor Procedure Remove the O-ring from the steering gear housing. DISCARD the O-ring. Inspect the assist motor shaft and inside of the steering gear housing for signs of water intrusion or corrosion. If no signs of water intrusion or corrosion are present proceed to the next step. If signs of water intrusion or corrosion are present then replace the steering gear. Refer to Electric Dual Pinion Rack and Pinion Steering Gear Replacement . Install a NEW O-ring around the steering gear housing. Install the steering gear drive coupling to the assist motor armature. Align the steering gear drive coupling on the assist motor armature to the steering gear. Align the NEW power steering assist motor bolts to the steering gear while pressing the assist motor over the steering gear housing O-ring. After installation is complete, transfer the key cycle count from the OLD steering gear control module to the NEW steering gear control module. Refer to Power Steering Control Module Programming and Setup . NOTE: Inspection of the steering gear assist motor shaft and the inside of the steering gear housing is required to ensure there are no signs of water intrusion or corrosion which may cause premature motor failure. If signs of water intrusion or corrosion are present the steering gear must be replaced.
CAUTION
Electrostatic discharge (ESD) can damage many solid-state electrical components. ESD susceptible components may or may not be labeled with the ESD symbol. Handle all electrical components carefully. Use the following precautions in order to avoid ESD damage: Touch a metal ground point in order to remove your body's static charge before servicing any electronic component; especially after sliding across the vehicle seat. Do not touch exposed terminals. Terminals may connect to circuits susceptible the ESD damage. Do not allow tools to contact exposed terminals when servicing connectors. Do not remove components from their protective packaging until required to do so. Avoid the following actions unless required by the diagnostic procedure: Jumpering or grounding of the components or connectors. Connecting test equipment probes to components or connectors. Connect the ground lead first when using test probes. Ground the protective packaging of any component before opening. Do not rest solid-state components on metal workbenches, or on top of TVs, radios, or other electrical devices.
WARNING
This component is equipped with torque-to-yield fasteners. Install a NEW torque-to-yield fastener when installing this component. Failure to replace the torque-to-yield fastener could cause bodily injury and damage to the vehicle or component.
CAUTION
Refer to Fastener Caution .
NOTE
Inspection of the steering gear assist motor shaft and the inside of the steering gear housing is required to ensure there are no signs of water intrusion or corrosion which may cause premature motor failure. If signs of water intrusion or corrosion are present the steering gear must be replaced.

Power Steering Assist Motor Replacement

Steering Angle Sensor Centering and Software Endstop Learning

WARNINGAn inaccurate or not centered steering angle sensor could limit the operation of the electric power steering (EPS) and result in personal injury.

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.

Scheme 8

Scheme 8: Power Steering System Description and Operation (Electronic Power Steering)
Scheme 8: Power Steering System Description and Operation (Electronic Power Steering)

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.

Special Tools

Illustration Tool Number/ Description CH-22610 CH-49658 J-22610 KM-J-22610 SA9164C Clamp Pliers CH-24319-B J-24319-B SA91100C Tie Rod Puller CH-39570 J-39570 Chassis Ear EN-45059 J-45059 Angle Meter GE-8001 J-8001 Dial Indicator Set

Scheme 9

Scheme 9: Special Tools
Scheme 9: Special Tools

Scheme 10

Scheme 10
Scheme 10

Scheme 11

Scheme 11
Scheme 11

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
• DTC C0710
• Diagnostic Trouble Code (DTC) List - Vehicle
• Steering Angle Sensor Centering
• Power Steering Control Module Programming and Setup
• Symptoms - Steering Wheel and Column
• Noise Diagnosis - Front Suspension
• Intermediate Steering Shaft Replacement
• Lower Control Arm Replacement
• Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label
• Lifting and Jacking the Vehicle
• Tire and Wheel Removal and Installation
• Wheel Alignment Measurement
• Fastener Caution
• Wheel Alignment - Steering Wheel Angle and/or Front Toe Adjustment
• Catalytic Converter Replacement
• Transmission Mount Bracket Replacement - Rear
• Drivetrain and Front Suspension Frame Replacement
• Component Fastener Tightening Caution
• DTC C005B
• Steering Effort Hard or Too Easy in One or Both Directions
• Increase in Effort While Turning Steering Wheel
• Poor Return of Steering Wheel
• Steering Wheel Surges/Jerks While Turning
• Steering Wheel Kickback
• Special Tools