Workshop manuals include comprehensive steering system sections covering component layout, alignment specifications, service procedures, and diagnostic guides. Steering is a safety-critical system where getting things right matters more than most repairs – a loose tie rod end or under-torqued fastener can cause a loss of control at speed. Understanding the manual’s steering section helps ensure repairs are done correctly.
Steering System Types
Modern vehicles use one of four main steering systems, each covered in a specific section. Hydraulic power steering uses an engine-driven pump, high and low pressure hoses, a control valve, and a hydraulic ram or rack piston (common on vehicles up to about 2010). Electro-hydraulic power steering (EHPS) uses an electric motor to drive the hydraulic pump instead of an engine belt – found on some Fords and Fiat/Alfa vehicles. Electric power steering (EPS) uses a motor attached to the steering rack or column directly, with no hydraulics – now the dominant system on new vehicles. Manual steering (no assistance) is now rare except on some entry-level utility vehicles.
Component Diagrams
The manual includes exploded diagrams of the steering column (with universal joints and collapsible sections designed to absorb crash energy), the steering rack (rack-and-pinion or older recirculating ball designs), the tie rod inner and outer joints, the intermediate shaft, and the mounting bushings. These diagrams identify replaceable parts, orientation for installation, and where torque specifications apply. Getting orientation wrong on universal joints or rack mounting can cause bind, uneven steering feel, and eventual component damage.
Torque Specifications
Steering fasteners have specific torque values that must be followed. Typical values include tie rod jam nuts at 40-60 Nm, tie rod end castle nuts at 50-90 Nm (with a cotter pin), rack mounting bolts at 60-100 Nm, and steering column pinch bolts at 20-40 Nm. Under-torqued fasteners work loose over time – a loose tie rod can separate on a bump and cause loss of steering. Over-torqued fasteners strip threads or crush bushings. The manual lists exact torque values, tightening sequences, and any angle specifications for critical fasteners.
Steering Angle Sensor Calibration
Modern vehicles have a steering angle sensor that tells the ABS, ESP, and lane keeping systems where the wheels are pointing. When you replace the sensor, rack, column, or after wheel alignment or battery disconnection, this sensor typically needs recalibration. The manual specifies the calibration procedure – some vehicles are automatic (drive in a straight line for a set distance), others require a scan tool procedure. Uncalibrated sensors cause ESP faults, straight-ahead ABS engagement errors, and false lane departure warnings.
Alignment Specifications
The steering section usually cross-references the alignment specifications from the suspension section. Front toe (the most commonly adjusted angle) is typically specified in millimetres of total toe or degrees per wheel. Camber is often not adjustable on newer vehicles but has specification ranges the manual documents. Understanding the specs helps you sanity-check what an alignment shop shows you on their printout – values wildly out of manufacturer specs suggest damaged components rather than needing minor adjustment.
EPS Diagnostic Codes
Electric power steering systems report faults via diagnostic trouble codes accessible with a scan tool. Common codes indicate torque sensor faults, motor faults, control module faults, or voltage supply issues. The manual lists the codes specific to your vehicle, the meaning, and the diagnostic flowchart to isolate the cause. Some EPS faults will disable power assist entirely (the steering becomes very heavy at low speed) while others just illuminate a warning without loss of function.
Fluid Specifications (Hydraulic Systems)
For hydraulic power steering, the manual specifies the fluid type – common options include Dexron ATF (many Japanese vehicles), Pentosin CHF 11S (many European vehicles), or manufacturer-specific PSF. Using the wrong fluid damages seals and causes leaks or noisy operation. The manual also lists the capacity for a complete fluid change and the correct bleed procedure to remove air after service.
Steering system specifications and procedures are highly vehicle-specific. MechanicMate offers PDF workshop manuals for over 960 models at mechanicmate.net/shop.
— MechanicMate . Questions or a second opinion? [email protected].