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
Electrical Information Reference
- «Circuit Testing»(ref-542498-S42729642072013041600000)
- «Connector Repairs»(ref-542498-S10348064002013041600000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-542498-S27468711012013041600000)
- «Wiring Repairs»(ref-542498-S06256207262013041600000)
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Note. Since most occurrences of this DTC are caused by excessive driver inputs, review the conditions under which the DTC sets with the customer.
- Verify the DTC sets outside the conditions for running and setting the DTC. If the DTC sets within the conditions for running and setting the DTC The power steering system is operating as designed If the DTC sets outside the conditions for running and setting the DTC
- Operate the vehicle within the conditions that the customer experienced.
- Verify that the DTC does not set. If the DTC sets Replace the K43 Power Steering Control Module If the DTC does not set
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- «Steering Gear Replacement»(ref-542506-S14854649392013041600000)
- «Control Module References»(ref-542499-S01936129122013041600000) for power steering control module replacement, programming and setup.
Schematic Reference
Power Steering Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Power Steering System Description and Operation
Electrical Information Reference
- «Circuit Testing»(ref-542498-S42729642072013041600000)
- «Connector Repairs»(ref-542498-S10348064002013041600000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-542498-S27468711012013041600000)
- «Wiring Repairs»(ref-542498-S06256207262013041600000)
Scan Tool Reference
Control Module References for scan tool information
- Ignition ON
- Verify with a scan tool that DTC C0475 57 is not set. If the DTC is set Replace the steering column. If the DTC is not set
- All OK.
Perform the Diagnostic Repair Verification after completing the repair.
- «Steering Column Replacement»(ref-542491-S15816151792013041600000)
- «Control Module References»(ref-542499-S01936129122013041600000) for power steering control module replacement, programming and setup.
Schematic Reference
Power Steering Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Power Steering System Description and Operation
Electrical Information Reference
- «Circuit Testing»(ref-542498-S42729642072013041600000)
- «Connector Repairs»(ref-542498-S10348064002013041600000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-542498-S27468711012013041600000)
- «Wiring Repairs»(ref-542498-S06256207262013041600000)
Scan Tool Reference
Control Module References for scan tool information
- Ignition ON.
- Verify with a scan tool that DTC C0545 is not set. If the DTC is set Replace the steering column. If the DTC is not set
- All OK.
Perform the Diagnostic Repair Verification after completing the repair.
- «Steering Column Replacement»(ref-542491-S15816151792013041600000)
- «Control Module References»(ref-542499-S01936129122013041600000) for power steering control module replacement, programming and setup.
Schematic Reference
- «Data Communication Schematics»(ref-542516-S26554268112013041600000)
- «Control Module References»(ref-542499-S01936129122013041600000)
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
- «Circuit Testing»(ref-542498-S42729642072013041600000)
- «Connector Repairs»(ref-542498-S10348064002013041600000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-542498-S27468711012013041600000)
- «Wiring Repairs»(ref-542498-S06256207262013041600000)
Scan Tool Reference
Control Module References for scan tool information
- Ignition ON.
- Verify DTC C056D is not set. If DTC C056D is set in a device that can be programmed Program the device that set the DTC. Verify the DTC does not set. If the DTC sets, replace the device that set the DTC. If the DTC does not set All OK. If DTC C056D is set in a device that cannot be programmed Replace the device that set the DTC. If DTC C056D is not set
- All OK
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for device replacement, 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 .
Increase in Effort While Turning Steering Wheel
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you review the Power Steering System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Power Steering System |
| 2 | Verify that there is an increase in effort while turning is present. Does the system operate normally? | System OK | Go to Step 3 |
| 3 | Check for the following tire related conditions: Incorrect tire inflation-Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label . Improper tire size Did you find and correct the condition? | Go to Step 10 | Go to Step 4 |
| 4 | Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Check for a binding or worn tie rod end. Is the tie rod binding or worn? | Go to Step 7 | Go to Step 5 |
| 5 | Check for a worn or binding intermediate shaft. Is the intermediate shaft worn or binding? | Go to Step 8 | Go to Step 6 |
| 6 | Check for a worn or binding steering gear. Is the steering gear worn or binding? | Go to Step 9 | System OK |
| 7 | Replace the outer tie rod. Refer to Steering Linkage Outer Tie Rod Replacement . Did you complete the repair? | Go to Step 10 | |
| 8 | Replace the intermediate shaft. Refer to Intermediate Steering Shaft Replacement . Did you complete the repair? | Go to Step 10 | |
| 9 | Replace the steering gear. Refer to Steering Gear Replacement . Did you complete the repair? | Go to Step 10 | |
| 10 | Operate 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
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: After completing a turn, extra steering input is required for the steering wheel to return to center. | |||
| 1 | Did you review the Power Steering System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Power Steering System |
| 2 | Verify that poor return of the steering wheel is present. Does the system operate normally? | System OK | Go to Step 3 |
| 3 | Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Lubricate the tie rod ends and ball joints, if applicable. Inspect the suspension system for worn or damaged components. Repair as necessary. Did you find and correct the condition? | Go to Step 12 | Go to Step 4 |
| 4 | 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 5 | Go to Step 10 |
| 5 | NOTE: Position the wheels straight ahead. Do NOT rotate the steering wheel more than one complete revolution from center. Disconnect the intermediate 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 11 | Go to Step 6 |
| 6 | Inspect the intermediate shaft for stiff or loose joints. Repair or replace as necessary. Did you find and complete the repair? | Go to Step 12 | Go to Step 7 |
| 7 | Remove the front tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation . Disconnect both outer tie rod ends from the steering knuckles. Use your hands in order to move the tie rod end studs. If abnormally difficult to move, replace the tie rod end. If equipped with recirculating ball steering, ensure that idler and pitman arm joints are not to stiff. Repair as necessary. Did you find and complete the repair? | Go to Step 12 | Go to Step 8 |
| 8 | Use your hands to rotate the steering knuckle inboard and outboard in order to inspect for a binding strut bearings, ball joints, or axle. Repair or replace any abnormally stiff or loose components. Did you find and complete the repair? | Go to Step 12 | Go to Step 9 |
| 9 | Inspect for binding in the steering gear. If a binding is present, repair or replace the steering gear. Did you find and complete the repair? | Go to Step 12 | Go to Step 10 |
| 10 | Inspect the wheel alignment and adjust as necessary. Refer to Wheel Alignment Measurement . Did you find and complete the repair? | Go to Step 12 | |
| 11 | Inspect the steering column for a binding. If a binding is present, repair or replace the steering column as necessary. Did you find and complete the repair? | Go to Step 12 | |
| 12 | Operate 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. |
Poor Return of Steering Wheel
Steering Wheel Surges/Jerks While Turning
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you review the Power Steering System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Power Steering System |
| 2 | Verify that the steering wheel surges or jerks while turning. Does the system operate normally? | System OK | Go to Step 3 |
| 3 | Inspect the front suspension for worn or binding components. Did you find and correct the condition? | Go to Step 14 | Go to Step 4 |
| 4 | Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Inspect the steering linkage outer tie rod for wear or a binding condition. Is the steering linkage outer tie rod worn or binding? | Go to Step 10 | Go to Step 5 |
| 5 | Inspect the intermediate steering shaft for wear or a binding condition. Is the intermediate steering shaft worn or binding? | Go to Step 11 | Go to Step 6 |
| 6 | Inspect the steering gear for wear or a binding condition. Is the steering gear worn or binding? | Go to Step 12 | Go to Step 7 |
| 7 | Inspect the steering column for wear or a binding condition. Is the steering column worn or binding? | Go to Step 13 | Go to Step 8 |
| 8 | Inspect the power steering assist motor for an indication of excessive heat. Does the power steering assist motor appear to be overheated? | Go to Step 9 | Go to Step 13 |
| 9 | NOTE: 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 14 | Go to Step 13 |
| 10 | Replace the steering linkage outer tie rod. Refer to Steering Linkage Outer Tie Rod Replacement . Did you complete the repair? | Go to Step 14 | |
| 11 | Replace the intermediate steering shaft. Refer to Intermediate Steering Shaft Replacement . Did you complete the repair? | Go to Step 14 | |
| 12 | Replace the steering gear. Refer to Steering Gear Replacement . Did you complete the repair? | Go to Step 14 | |
| 13 | Replace the steering column. Refer to Steering Column Replacement . Did you complete the repair? | Go to Step 14 | |
| 14 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go 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
| Condition | Action |
|---|---|
| The steering column mounting bolts are loose. | Tighten the pivot bolt and the mounting bolts to specification. |
| The steering gear is loosely mounted. | Tighten the steering gear mounting bolts to specification. |
| The steering linkage tie rods are loose or damaged. | Inspect the steering linkage tie rods. If necessary, replace the steering linkage tie rods. Refer to Steering Linkage Outer Tie Rod Replacement , or to Steering Linkage Inner Tie Rod Replacement . |
Steering Wheel Kickback
Steering Effort Hard or Too Easy in One or Both Directions
| Condition | Action |
|---|---|
| The battery power is low. | Confirm proper battery voltage. |
| The intermediate shaft dash seal is binding. | Adjust the dash seal, or replace the intermediate shaft assembly if necessary. Refer to Intermediate Steering Shaft Replacement . |
| The intermediate shaft joints are loose or worn. | Inspect the joints and the pinch bolts for damage, and replace the intermediate shaft if necessary. Refer to Intermediate Steering Shaft Replacement . |
| The steering gear is binding. | If necessary, inspect and replace the steering gear. Refer to Steering Gear Replacement . |
| The upper steering shaft is bent. | If necessary, replace the steering column. Refer to Steering Column Replacement . |
| The assist mechanism hub gear is misaligned or damaged. | Replace the steering column. Refer to Steering Column Replacement . |
| The sensor wire is damaged. | Replace the steering column. Refer to Steering Column Replacement . |
| The controller is malfunctioning. | Confirm the DTC. If necessary, replace the steering column, which includes the motor and module assembly. Refer to Steering Column Replacement . |
| The motor shaft is binding. | Confirm the DTC. If necessary, replace the steering column, which includes the motor and module assembly. Refer to Steering Column Replacement . |
Steering Effort Hard or Too Easy in One or Both Directions
Steering Wheel Position Sensor
The power steering control module (PSCM) uses the steering position sensor to determine the steering system on center position. Since the power steering motor provides a slight amount of return to center assist, the PSCM will command the power steering motor to the steering system center position and not beyond. The sensor is a 5-volt dual analog triangle signal device with a valid signal voltage range of 0-5 volts. The sensors signal 1 and signal 2 voltage values will increase and decrease within the valid voltage range, and stay within 2.5-2.8 volts of each other as the steering wheel is turned.
Power Steering Motor
The power steering motor is a 12-volt brushless DC reversible motor with a 65-amp rating. The motor assists steering through a worm gear and reduction gear located in the steering column housing.
Power Steering Control Module (PSCM)
The power steering control module (PSCM) uses a combination of steering shaft torque sensor input, vehicle speed, calculated system temperature and steering tuning to determine the amount of steering assist. When the steering wheel is turned, the PSCM uses signal voltage from the steering shaft torque sensor to detect the amount of torque and steering direction being applied to the steering column shaft and then command the proper amount of current to the power steering motor. The PSCM receives a vehicle speed message from the powertrain control module (PCM) via the serial data circuit. At low speeds more assist is provided for easy turning during parking maneuvers. At high speeds, less assist is provided for improved road feel and directional stability. The PSCM nor the power steering motor are designed to handle 65 amps continuously. If the power steering system is exposed to excessive amounts of static steering conditions, the PSCM will go into a protection mode to avoid thermal damage to the power steering components. In this mode the PSCM will limit the amount of current commanded to the power steering motor which reduces system temperature and steering assist levels. The PSCM must also be setup with the correct steering tuning which are different in relation to the vehicles powertrain configuration, sedan, coupe, tire and wheel size etc. The PSCM has the ability to detect malfunctions within the power steering system. Any malfunction detected will cause the driver information center (DIC) to turn ON a warning indicator.