Power Steering Assist Motor Replacement (NJ1)

Fig 1: Power Steering Assist Motor & Bolts (NJ1)

Courtesy of GENERAL MOTORS COMPANY

Callout	Component 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 toStrategy Based Diagnosis . Capture the key cycle count from the old steering gear control module. If the key cycle count from the old steering gear control module is not captured, it will not be possible to flash the new steering gear control module. Refer to Power Steering Control Module Programming and Setup (Electronic Power Steering) . Electric Dual Pinion Rack and Pinion Steering Gear Replacement (FWD, LTG, M7W, NJ1) orElectric Dual Pinion Rack and Pinion Steering Gear Replacement (FWD, LEA/MH8, LUK/MHH, NJ1) Remove NOTE: The power steering control module is part of the power steering assist motor. If communication with the OLD power steering control module cannot be established, then replace the entire steering gear as an assembly. Do NOT proceed with replacement of just the power steering assist motor.
1	Power Steering Assist Motor Bolt WARNING: This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fasteners could cause damage to the vehicle, component, or bodily injury. 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 N.m (71 lb in)
2	Power Steering Assist Motor Procedure Remove the O-ring from the steering gear housing. DISCARD the O-ring seal. Inspect the steering gear 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 (FWD, LTG, M7W, NJ1) or Electric Dual Pinion Rack and Pinion Steering Gear Replacement (FWD, LEA/MH8, LUK/MHH, NJ1) . Install a NEW O-ring around the steering gear housing. Install the steering gear coupling to the assist motor armature. Align the steering gear coupling on the assist motor armature to the steering gear. Align the power steering assist motor bolts to the steering gear while pressing the motor over the 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 toPower Steering Control Module Programming and Setup (Electronic Power Steering) . NOTE: Inspection of the steering gear 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.

Callout

Component 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 toStrategy Based Diagnosis .
Capture the key cycle count from the old steering gear control module. If the key cycle count from the old steering gear control module is not captured, it will not be possible to flash the new steering gear control module. Refer to Power Steering Control Module Programming and Setup (Electronic Power Steering) .
Electric Dual Pinion Rack and Pinion Steering Gear Replacement (FWD, LTG, M7W, NJ1) orElectric Dual Pinion Rack and Pinion Steering Gear Replacement (FWD, LEA/MH8, LUK/MHH, NJ1) Remove

NOTE:

The power steering control module is part of the power steering assist motor.
If communication with the OLD power steering control module cannot be established, then replace the entire steering gear as an assembly. Do NOT proceed with replacement of just the power steering assist motor.

Power Steering Assist Motor Bolt

WARNING:

This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fasteners could cause damage to the vehicle, component, or bodily injury.

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 N.m (71 lb in)

Power Steering Assist Motor

Procedure

Remove the O-ring from the steering gear housing. DISCARD the O-ring seal.
Inspect the steering gear 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 (FWD, LTG, M7W, NJ1) or Electric Dual Pinion Rack and Pinion Steering Gear Replacement (FWD, LEA/MH8, LUK/MHH, NJ1) .
Install a NEW O-ring around the steering gear housing.
Install the steering gear coupling to the assist motor armature.
Align the steering gear coupling on the assist motor armature to the steering gear.
Align the power steering assist motor bolts to the steering gear while pressing the motor over the 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 toPower Steering Control Module Programming and Setup (Electronic Power Steering) .

NOTE:

Inspection of the steering gear 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.