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Steering System: Other Dodge Durango III

Manual & Power Steering 18 illustrations ~4779 words

WITHOUT EHPS

CAUTIONThere is an Electro-Hydraulic Power Steering (EHPS) pump on some vehicles requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The mechanical power steering pump systems on this vehicle require the use of Power Steering Fluid +4, which meets material specification MS-9602 or equivalent. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.

The belt driven power steering systems consist of

  1. Steering column and Intermediate Shaft
  2. Rack and pinion steering gear
  3. Hydraulic power steering pump
  4. Pump pressure and return hoses
  5. Remote power steering reservoir
  6. Oil Cooler

WITH EHPS

CAUTIONThere is an Electro-Hydraulic Power Steering (EHPS) pump on some vehicles requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The mechanical power steering pump systems on this vehicle require the use of Power Steering Fluid +4, which meets material specification MS-9602 or equivalent. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.

Scheme 34

Scheme 34
Scheme 34

The EHPS system consists of

  1. Steering column and Intermediate Shaft
  2. Rack and pinion steering gear
  3. EHPS pump (3.6L) (3)
  4. Pump pressure (5) and supply/return line assembly (1, 2)
  5. Remote power steering reservoir (The EHPS reservoir has only one hose connection)
  6. Some early built vehicles with EHPS do not have a power steering system cooler effecting the power steering line/hose configuration.

Power assist is provided by the EHPS pump (3) mounted to the cradle in front of the engine. The EHPS pump is an electrically operated hydraulic pump which supplies variable hydraulic fluid flow and pressure to the steering gear. The EHPS pump replaces the conventional belted power steering pump. The EHPS pump has an EHPS module attached (not replaceable separately). There are two electrical connectors (6) on the EHPS pump assembly (3). One connector is a 12 volt low amperage module connector, and the other is a 12V higher amperage pump connector containing a larger gauge wire for motor operation. The power steering hoses and steering gear are substantially unchanged in function from a conventional system. However, there are unique components for this system, such as hoses for routing and the gear for valve tuning.

The steering column intermediate shaft attaches the steering column to the gear pinion. The rotation of the pinion moves the gear rack from side-to-side. This lateral action of the rack pushes and pulls the tie rods to change the direction of the front wheels.

Power assist is provided by an engine mounted hydraulic pump. The pump supplies hydraulic fluid to the steering gear. All vehicles are equipped with an oil cooler.

CAUTIONThere is an Electro-Hydraulic Power Steering (EHPS) pump on some vehicles requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The mechanical power steering pump systems on this vehicle require the use of Power Steering Fluid +4, which meets material specification MS-9602 or equivalent. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.

Multiple modules work together to improve vehicle steering assist at different rates at different speeds. At slow speeds (parking maneuvers) more assist is available and at high speeds less assist is available. The EHPS module uses the CAN - C data bus for inputs and outputs of the information necessary for operation. The use of a scan tool is necessary for diagnostics. EHPS module faults are stored in a diagnostic program memory and are accessible with the scan tool. Faults remain in memory until cleared, or until after the vehicle is started approximately 50 times. Stored faults are not erased if the battery is disconnected. For descriptions and procedures related to DTCs. Refer to DIAGNOSIS AND TESTING .

The Electro-Hydraulic Power Steering (EHPS) Pump assembly contains a control module, brushless electric motor, and hydraulic pump integrated into a single unit. The EHPS Pump draws power from the 12 volt electrical system and provides the necessary flow and pressure to the steering gear to provide normal power steering. The output flow of the EHPS Pump is varied as a function of Steering Wheel Rate (received from SAS) and Vehicle Speed (received from ABS Module) in order to provide the optimum flow of power steering fluid to the steering gear under all operating conditions. The EHPS Pump will start to provide steering assist when the Vehicle speed message greater than 5 km/h (3 mph) is received on CAN C. If the Vehicle Speed message is missing at vehicle startup, the EHPS Pump will not operate. If the Vehicle Speed message is lost during operation the EHPS pump will use a default vehicle speed of 85 km/h (59 mph) to calculate desired flow and as a result, steering effort will no longer be speed sensitive. If the Steering Wheel Position message is lost the EHPS Pump will use a default steering wheel rate of 230°/sec to calculate desired flow and as a result, steering effort may be higher on evasive steering maneuvers. The EHPS pump will resume normal operation automatically once any missing message or out of range condition noted above is restored to normal.

Note. There are three diagnosis charts following that cover NOISE, VIBRATION AND HARSHNESS (NVH) ISSUES, PERFORMANCE ISSUES, and FLUID ISSUES.

PERFORMANCE ISSUES

CONDITIONPOSSIBLE CAUSESEVALUATION/CORRECTION
STEERING WHEEL OR COLUMN HAS FREEPLAY/LASH/LOOSENESS (CLUNKING OR RATTLING)1. Loose coupling pinch bolt at gear input shaft.1. Check pinch bolt torque. Replace pinch bolt if equipped with thread locker patch and tighten to specifications.
2. Power steering gear loose on cradle/crossmember.2. Inspect gear mounting bolts. Replace if necessary and tighten to specifications.
3. Excessive freeplay or noise from steering column bearings.3. Replace steering column.
4. Excessive intermediate (steering) shaft coupling u-joint free-play.4. Rotate steering wheel back-and-forth while watching coupling. Observe for free-play. Replace intermediate shaft as necessary.
5. Loose or worn outer tie rod.5. For evaluation and correction. Refer to END, TIE ROD, DIAGNOSIS AND TESTING .
6. Lack of lubrication in lower ball joint or ball joint is damaged.6. For evaluation. Refer to BALL JOINT, SUSPENSION, LOWER, DIAGNOSIS AND TESTING . Lubricate ball joint if equipped with a zerk fitting and check for function. If not equipped with a zerk fitting, test and replace ball joint as necessary.
7. Excessive lash inside steering gear.7. Disconnect intermediate shaft and turn steering gear input shaft. Observe for any movement without a corresponding tire movement. Replace steering gear as necessary.
STEERING WHEEL HAS FORE AND AFT LOOSENESS.1. Steering wheel retaining bolt loose.1. Check steering wheel retaining bolt torque and tighten to specifications as necessary.
2. Loose steering column to instrument panel fasteners.2. Check steering column to instrument panel fastener torque and tighten to specifications as necessary.
3. Steering column lower bearing spring retainer slipped on steering column shaft.3. Pull steering wheel fore-and-aft while observing movement. Replace steering column as necessary.
STEERING WHEEL, DASH OR VEHICLE VIBRATES DURING STEERING MANEUVERS (ESPECIALLY AT LOW SPEED OR STANDSTILL).1. Air in power steering fluid.1. Inspect for excessive air bubbles in fluid (fluid will appear foamy and lighter in color). Inspect hoses for leaks and replace as necessary. Bleed air from fluid. Refer to STANDARD PROCEDURE .
2. Tire(s) not properly inflated.2. Check and inflate tires to the specified pressure.
3. Excessive engine vibration.3. Ensure that the engine is tuned properly.
4. Loose tie rod end jam nut.4. Check torque and tighten the inner to outer tie rod jam nut to specifications.
5. Overcharged air conditioning (A/C) system.5. Turn A/C off and verify issue goes away. Repair A/C as necessary.
6. Grounded, damaged or loose engine mount.6. Visually inspect for damaged or misaligned mounts. Check fastener torque. Replace, realign or retighten as necessary.
7. Loose or worn outer tie rod.7. For evaluation and correction. Refer to END, TIE ROD, DIAGNOSIS AND TESTING .
8. Steering gear noisy.8. During a parking event at 0 mph, verify there is vibration only with steering. Steer in both directions and verify that the noise follows the steering input. Check TSB's for any known issues. Replace steering gear as necessary.
STEERING CATCHES, SURGES OR STICKS IN CERTAIN POSITIONS OR IS DIFFICULT TO TURN.1. Low power steering fluid level.1. Check fluid level and fill to proper level as necessary. Check for leaks. Make sure all air is bled from system.
2. Tire(s) not properly inflated.2. Check and inflate tires to the specified pressure.
3. Loose or slipping power steering/accessory drive belt.3. Verify belt tension. Replace belt auto-tensioner and belt as necessary.
4. Lack of lubrication in lower ball joint or ball joint is damaged.4. For evaluation. Refer to BALL JOINT, SUSPENSION, LOWER, DIAGNOSIS AND TESTING . Lubricate ball joint if equipped with a zerk fitting and check for function. If not equipped with a zerk fitting, test and replace ball joint as necessary.
5. Lack of lubrication in steering gear outer tie rod end(s).5. For evaluation and correction. Refer to END, TIE ROD, DIAGNOSIS AND TESTING .
6. Faulty power steering pump.6. Perform Power Steering Flow and Pressure Test. Refer to DIAGNOSIS AND TESTING . Look for low or erratic flow or pressure. Replace power steering pump as necessary.
7. Excessive friction in intermediate shaft/coupler joint.7. Disconnect intermediate shaft/coupler at steering gear and check joint for smooth operation in all directions. Replace intermediate shaft/coupler joint.
8. Excessive friction in steering column.8. Disconnect intermediate shaft/coupler at steering gear. Turn steering wheel two revolutions in either direction from on center and check for smooth operation. DO NOT turn past two revolutions. Damage to the clockspring may occur. Replace steering column as necessary.
9. Worn or binding seat and bearing in front strut assembly.9. Disconnect outer tie rod ends from knuckles, then turn tire and wheel assembly checking for smooth operation. Replace front strut assembly seat and bearing.
10. Faulty steering gear.10. With vehicle on hoist, tires unsupported and engine off, steer gear throughout travel and check for smooth operation. Replace steering gear (only after all previous components have been checked).
STEERING WHEEL DOES NOT RETURN TO CENTER POSITION.1. Tire(s) not properly inflated.1. Check and inflate tires to the specified pressure.
2. Improper front wheel alignment.2. Check and adjust wheel alignment as necessary.
3. Lack of lubrication in lower ball joint or ball joint is damaged.3. For evaluation. Refer to BALL JOINT, SUSPENSION, LOWER, DIAGNOSIS AND TESTING . Lubricate ball joint if equipped with a zerk fitting and check for function. If not equipped with a zerk fitting, test and replace ball joint as necessary.
4. Excessive friction in intermediate shaft/coupler joint.4. Disconnect intermediate shaft/coupler at steering gear and check joint for smooth operation in all directions. Replace intermediate shaft/coupler joint.
5. Excessive friction in steering column.5. Disconnect intermediate shaft/coupler at steering gear. Turn steering wheel two revolutions in either direction from on center and check for smooth operation. DO NOT turn past two revolutions. Damage to the clockspring may occur. Replace steering column as necessary.
6. Worn or binding seat and bearing in front strut assembly.6. Disconnect steering gear outer tie rod ends at knuckles, then turn tire and wheel assembly in and out checking for smooth operation. Replace seat and bearing as necessary.
7. Excessive friction in power steering gear.7. With vehicle on hoist, tires unsupported and engine off, steer gear throughout travel and check for smooth operation. Replace steering gear (only after all previous components have been checked).
EXCESSIVE STEERING WHEEL KICKBACK FROM ROAD INPUTS1. Air in power steering fluid.1. Inspect for excessive air bubbles in fluid (fluid will appear foamy and lighter in color). Inspect hoses for leaks and replace as necessary. Bleed air from fluid. Refer to STANDARD PROCEDURE .
2. Power steering gear loose on cradle/crossmember.2. Inspect gear mounting bolts. Replace if necessary and tighten to specifications.
3. Steering column, coupling or intermediate shaft worn or loose.3. Rotate steering wheel back-and-forth while inspecting intermediate shaft going into steering gear. Look for excessive free-play. Retighten if loose bolt is found. Replace steering column, coupling or intermediate shaft if necessary.
4. Power steering pump flow is too low.4. Perform Power Steering Flow and Pressure Test. Refer to DIAGNOSIS AND TESTING . Look for low or erratic flow or pressure. Replace power steering pump as necessary.

POWER STEERING FLOW AND PRESSURE - ELECTRO-HYDRAULIC POWER STEERING (EHPS)

The following procedure is used to test the operation of the power steering system on the vehicle (equipped with EHPS). This test provides the Gallons Per Minute (GPM) or the flow rate of the power steering pump along with the maximum relief pressure. Perform this test any time a power steering system problem is present. This test determines if the power steering pump or power steering gear is not functioning properly. The following pressure and flow test is performed using Power Steering Kit (special tool #6815, Kit, Power Steering), Hose (special tool #6905, Hose Assembly) from Power Steering Analyzer Adapter Kit (special tool #6893A, Kit, Power Steering), Hose (special tool #6959, Hose Assembly), and Power Steering Analyzer Adapter (special tool #10250, Adapters, Power Steering)

WARNINGS AND CAUTIONS

The steering column on vehicles with an automatic transmission may not be equipped with an internal locking shaft that allows the ignition key cylinder to be locked with the key. Alternative methods of locking the steering wheel for service will have to be used.

Failure to center and lock the steering wheel for service can result in Steering Column Module damage.

The tilt column has been designed to be serviced as an assembly, less the wiring, switches, steering wheel, airbag, etc. Most steering column components can be serviced without removing the steering column from the vehicle.

The airbag system is a sensitive, complex electro-mechanical unit. Before attempting to diagnose, remove or install the airbag system components you must first disconnect and isolate the battery negative (ground) cable. Then wait two minutes for the system capacitor to discharge. Failure to do so could result in accidental deployment of the airbag and possible personal injury. The fasteners, screws, and bolts, originally used for the airbag components, have special coatings and are specifically designed for the airbag system. They must never be replaced with any substitutes. Anytime a new fastener is needed, replace with the correct fasteners provided in the service package or fasteners listed in the parts books.

Safety goggles should be worn at all times when working on steering columns.

3.6L

CAUTIONThe Steering Column Control Module (SCCM) is centered to the vehicles steering system. Failure to keep the system and steering column module centered and locked/inhibited from rotating can result in SCCM damage.

Scheme 35

Scheme 35
Scheme 35

Scheme 36

Scheme 36
Scheme 36

Scheme 37

Scheme 37
Scheme 37

Scheme 38

Scheme 38
Scheme 38

Scheme 39

Scheme 39
Scheme 39
  1. Place the front wheels in the straight ahead position with the steering wheel centered and locked with a steering wheel lock .
  2. Drain or siphon the power steering system.
  3. Raise and support the vehicle. See «HOISTING»(ref-465919-S17385638482012042300000) .
  4. Remove the front skid plate. Refer to «PLATE, SKID, FRONT, REMOVAL»(ref-465925-S30284619522012042300000) or «PLATE, SKID, FRONT SUSPENSION, REMOVAL»(ref-465925-S37911096052012042300000) .
  5. Remove the steering shaft coupler pinch bolt (2) and disconnect the coupler (1) from the steering shaft (3).
  6. Disconnect the pressure line (1), and the return line (2) at the gear (3).
  7. Remove the front tires and wheels.
  8. Remove the RH shock. Refer to «SHOCK ABSORBER, SUSPENSION, REMOVAL»(ref-465917-S19251694852012042300000) .
  9. Remove the outer tie rod ends. Refer to «END, TIE ROD, REMOVAL»(ref-465942-S32310964912012042300000) .
  10. Remove the steering gear retaining nuts/bolts (2).
  11. Lift and rotate the steering gear (2) so that the steering shaft (3) is forward to clear the oil pan (1) when removing the steering gear (2) through the RH wheel area.
  12. Lift and rotate the steering gear (1) as necessary to remove from behind the knuckle/rotor assembly (2) of the RH wheel area.

5.7L

CAUTIONThe Steering Column Control Module (SCCM) is centered to the vehicles steering system. Failure to keep the system and steering column module centered and locked/inhibited from rotating can result in SCCM damage.

Scheme 40

Scheme 40
Scheme 40
  1. If replacing the steering gear, remove the outer tie rod ends. Refer to «END, TIE ROD, REMOVAL»(ref-465942-S32310964912012042300000) .
  2. Remove the engine cradle (crossmember). Refer to «CROSSMEMBER, CRADLE, ENGINE AND SUSPENSION, REMOVAL»(ref-465925-S39542372532012042300000) .
  3. Remove steering gear retaining nuts/bolts (2).
  4. Rotate and shift the steering gear (3) to the right enough to lift the LH side of the steering gear (3) above the engine cradle (1), then remove the steering gear (3) by moving to the right above the engine cradle (1).
CAUTIONThe Steering Column Control Module (SCCM) is centered to the vehicles steering system. Failure to keep the system and steering column module centered and locked/inhibited from rotating can result in SCCM damage.
  1. Lift and rotate the steering gear (1) as necessary to install from behind the knuckle/rotor assembly (2) of the RH wheel area.
  2. Rotate the steering gear (1) into position, install the steering gear retaining nuts/bolts (2) and tighten to 244 N.m (180 ft. lbs.).
  3. Install the outer tie rod ends. Refer to «END, TIE ROD, INSTALLATION»(ref-465942-S06049646092012042300000) .
  4. Install the RH shock. Refer to «SHOCK ABSORBER, SUSPENSION, INSTALLATION»(ref-465917-S03964415022012042300000) .
  5. Connect the pressure line (1), and the return line (2) at the gear (3) and tighten to 28 N.m (21 ft. lbs.). CAUTION: The steering gear must be centered prior to installing the coupler to prevent clockspring damage.
  6. Connect the steering shaft coupler (1) to the steering shaft (3), install a new coupler pinch bolt (2) and tighten to 49 N.m (36 ft. lbs.).
  7. Install the front skid plate. Refer to «PLATE, SKID, FRONT, INSTALLATION»(ref-465925-S32552796172012042300000) or «PLATE, SKID, FRONT SUSPENSION, INSTALLATION»(ref-465925-S17703500932012042300000) .
  8. Install the wheels and tires. Refer to «WHEELS, STANDARD PROCEDURE»(ref-465920-S20100796812012042300000) .
  9. Remove the supports and lower the vehicle.
  10. Remove the steering wheel lock.
  11. Fill the power steering pump. Refer to «STANDARD PROCEDURE»(ref-465942-S26922506192012042300000) .
  12. Set the toe. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(ref-465917-S03736662762012042300000) .
CAUTIONThe Steering Column Control Module (SCCM) is centered to the vehicles steering system. Failure to keep the system and steering column module centered and locked/inhibited from rotating can result in SCCM damage.
  1. Position the steering gear (3) between the RH upper and lower parts of the cradle (crossmember) (1) as far as necessary to lower the LH side of the steering gear (3) into position and shift to the left.
  2. Install the steering gear retaining bolts/nuts (2) and tighten to 244 N.m (180 ft. lbs.).
  3. Install the engine cradle (1). Refer to «CROSSMEMBER, CRADLE, ENGINE AND SUSPENSION, INSTALLATION»(ref-465925-S23508879902012042300000) .
  4. If the outer tie rods were removed, install the tie rod ends. Refer to «END, TIE ROD, INSTALLATION»(ref-465942-S06049646092012042300000) .
  5. Perform a front alignment. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(ref-465917-S03736662762012042300000) .

TIE ROD

Tie rod free-play can be measured using the following hand methods

Note. When checking free-play, DO NOT rotate the tie rod. Just because a tie rod rotates easily, it is not necessarily faulty.

Note. Always check and repair (if necessary) outer tie rod free-play before checking inner tie rod free-play. False results can otherwise be obtained.

Scheme 41

Scheme 41: OUTER TIE ROD
Scheme 41: OUTER TIE ROD

Grasp the outer tie rod near the ball stud and attempt to move the tie rod straight up and down. If any free-play is felt, replace the outer tie rod. Refer to END, TIE ROD, REMOVAL . If no free-play is felt at the outer tie rod, attempt to move the inner tie rod in the same manner. Refer to the following procedure.

Scheme 42

Scheme 42: INNER TIE ROD
Scheme 42: INNER TIE ROD

Grasp the inner tie rod near the steering gear bellows and attempt to move the tie rod straight up and down. If any free-play is felt, replace the steering gear. Refer to GEAR, REMOVAL .

STEERING LINKAGE

The tie rod end and ball stud seals should be inspected during all oil changes. If a seal is damaged, replace the tie rod.

CAUTIONIf any steering components are replaced or serviced an alignment must be performed, to ensure the vehicle meets all alignment specifications.

Scheme 43

Scheme 43: INNER TIE ROD
Scheme 43: INNER TIE ROD

Note. Count the number of turns when removing the outer tie rod end from the inner tie rod end. This will aid in setting the toe after installation.

Scheme 44

Scheme 44
Scheme 44
  1. Remove the outer tie rod end. Refer to «END, TIE ROD, REMOVAL»(ref-465942-S32310964912012042300000) .
  2. Remove the jam nut.
  3. Remove the two clamps (1, 3) for the inner tie rod boot (2).
  4. Remove the boot (2) from the tie rod.
  5. Install the Inner Tie Rod Socket (special tool #10087-6, Socket, Inner Tie Rod) (1) and Inner Tie Rod Adapter Wrench (special tool #10087-2A, Adapter Wrench, Inner Tie Rod) (2) and remove the inner tie rod end.

Scheme 45

Scheme 45: OUTER TIE ROD END
Scheme 45: OUTER TIE ROD END

Note. Do not twist the boot anytime during removal or installation.

Scheme 46

Scheme 46
Scheme 46
  1. Loosen the jam nut (4).
  2. Remove the outer tie rod end nut (1) from the ball stud of the outer tie rod (3).
  3. Separate the outer tie rod end (4) from the steering knuckle (2) using Tie Rod Puller (special tool #C-3894-A, Puller, Tie Rod) (1). NOTE: Count the number of turns when removing the tie rod end as a reference point for installation.
  4. Remove the outer tie rod end (4) from the inner tie rod.

INNER TIE ROD

  1. Apply Mopar® Lock and Seal Adhesive or equivalent thread lock adhesive to the inboard side of the inner tie rod end.
  2. Thread the inner tie rod to the rack and pinion.
  3. Using the Inner Tie Rod Socket (special tool #10087-6, Socket, Inner Tie Rod) (1) and the Inner Tie Rod Adapter Wrench (special tool #10087-2A, Adapter Wrench, Inner Tie Rod) (2), tighten the inner tie rod end to 88 N.m (65 ft. lbs.). NOTE: Lubricant between the boot and tie rod end will allow the toe adjustment procedure without twisting the boot.
  4. Apply a small amount of Mopar® Lubriplate, or equivalent in the recessed area of the inner tie rod where the small end of the boot attaches.
  5. Position the large clamp (1) on the boot (2) and install the boot over the inner tie rod and rack.
  6. Engage the small end of boot (2) in the groove and install the small boot clamp (3).
  7. Using a crimp tool, or equivalent, tighten the large boot clamp (1).
  8. Install the jam nut (3) to the inner tie rod end. NOTE: The toe adjustment procedure must be performed after installing the outer tie rod.
  9. Install the outer tie rod. Refer to «END, TIE ROD, INSTALLATION»(ref-465942-S06049646092012042300000) .
  10. After toe adjustment, tighten the jam nut (3) to 75 N.m (55 ft. lbs).

OUTER TIE ROD END

Note. Do not twist the boot at anytime during removal or installation.

Note. Make sure jam nut (3) is installed on inner tie rod end (4) before the outer tie rod end (2) is installed.

  1. Thread the outer tie rod end (3) onto the inner tie rod, to it's original position.
  2. Install the outer tie rod end (3) into the steering knuckle, install the nut and tighten to 95 N.m (70 ft. lbs.).
  3. Set wheel toe pattern. Refer to «WHEEL ALIGNMENT, STANDARD PROCEDURE»(ref-465917-S03736662762012042300000) .
  4. Tighten the jam nut (4) to 75 N.m (55 ft. lbs.).

Note. There is no internal service of the Electro-Hydraulic Power Steering (EHPS) pump. Replace the EHPS pump as an assembly, including the brackets, and EHPS module.

The EHPS pump (3) replaces the conventional belt-driven power steering pump and draws its power from the 12 volt electrical system instead of the engine crankshaft reducing engine load.

The EHPS pump (3) mounts to the cradle in front of the engine. For more information on the EHPS pump/module. Refer to MODULE, ELECTRO-HYDRAULIC POWER STEERING, OPERATION .

Scheme 47

Scheme 47: WITHOUT EHPS
Scheme 47: WITHOUT EHPS

Hydraulic pressure for the power steering system is provided by a belt driven power steering pump (1). The pump shaft has a pressed-on drive pulley that is belt driven by the crankshaft pulley. The system uses a remote power steering reservoir mounted to a bracket near the air cleaner.

CAUTIONThere is an Electro-Hydraulic Power Steering (EHPS) pump on some vehicles requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The mechanical power steering pump systems on this vehicle require the use of Power Steering Fluid +4, which meets material specification MS-9602 or equivalent. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.

The power steering pump is a constant flow rate and displacement, vane-type pump. The pump internal parts operate submerged in fluid. The flow control orifice is part of the high pressure line fitting. The pressure relief valve inside the flow control valve limits the pump pressure. The reservoir is remote and is attached to the body behind the engine air cleaner body. The power steering pump is connected to the steering gear by the pressure and return hoses.

Note. Power steering pumps have different pressure rates and are not interchangeable with other pumps.

CAUTIONThere is an Electro-Hydraulic Power Steering (EHPS) pump on some vehicles requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The mechanical power steering pump systems on this vehicle require the use of Power Steering Fluid +4, which meets material specification MS-9602 or equivalent. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.

Multiple modules work together to improve vehicle steering assist at different rates at different speeds. At slow speeds (parking maneuvers) more assist is available and at high speeds less assist is available. The EHPS module uses the CAN - C data bus for inputs and outputs of the information necessary for operation. The use of a scan tool is necessary for diagnostics. EHPS module faults are stored in a diagnostic program memory and are accessible with the scan tool. Faults remain in memory until cleared, or until after the vehicle is started approximately 50 times. Stored faults are not erased if the battery is disconnected. For descriptions and procedures related to DTCs. Refer to DIAGNOSIS AND TESTING .

The Electro-Hydraulic Power Steering (EHPS) Pump assembly contains a control module, brushless electric motor, and hydraulic pump integrated into a single unit. The EHPS Pump draws power from the 12 volt electrical system and provides the necessary flow and pressure to the steering gear to provide normal power steering. The output flow of the EHPS Pump is varied as a function of Steering Wheel Rate (received from SAS) and Vehicle Speed (received from ABS Module) in order to provide the optimum flow of power steering fluid to the steering gear under all operating conditions. The EHPS Pump will start to provide steering assist when the Vehicle speed message greater than 5 km/h (3 mph) is received on CAN C. If the Vehicle Speed message is missing at vehicle startup, the EHPS Pump will not operate. If the Vehicle Speed message is lost during operation the EHPS pump will use a default vehicle speed of 85 km/h (59 mph) to calculate desired flow and as a result, steering effort will no longer be speed sensitive. If the Steering Wheel Position message is lost the EHPS Pump will use a default steering wheel rate of 230°/sec to calculate desired flow and as a result, steering effort may be higher on evasive steering maneuvers. The EHPS pump will resume normal operation automatically once any missing message or out of range condition noted above is restored to normal.

POWER STEERING PUMP AND HOSES

Note. This information is designed to be used in conjunction with the diagnostic charts at the beginning of the Steering information. Refer to DIAGNOSIS AND TESTING .

CHECKING FOR WEAR OF POWER STEERING PUMP INTERNAL COMPONENTS

  1. Place gear selector in PARK (or NEUTRAL) with wheels chalked.
  2. With the engine idling, have a helper turn the steering wheel.
  3. Using an electronic listening tool, determine if noise is coming from the pump.
  4. Increase the engine speed and have a helper turn the steering wheel. Does the noise change with load?
  5. Replace the power steering pump if excessive noise is present. Refer to «PUMP, REMOVAL»(ref-465942-S21726515062012042300000) .

CHECKING FOR POWER STEERING HOSES TOUCHING BODY OR FRAME OF VEHICLE

Check hoses and hose tubes as following

  1. Inspect hoses and hose tubes for witness marks. If witness marks are present, adjust hose(s) to the proper position by loosening, repositioning and tightening attachments to the specified torque. Refer to «SPECIFICATIONS»(ref-465942-S13433300472012042300000) . Do not bend tubing to adjust. Replace the hose assembly if damaged.
  2. Check fastener torque of hose mounting brackets and tube nuts. Refer to «SPECIFICATIONS»(ref-465942-S13433300472012042300000) .
  3. Have a helper bump the steering gear off of the stops to induce pressure fluctuations which may move the hose. If hose contact is made, adjust hose(s) to the proper position by loosening, repositioning and tightening attachments to the specified torque. Refer to «SPECIFICATIONS»(ref-465942-S13433300472012042300000) . Do not bend tubing to adjust. Replace the hose assembly if damaged.
CAUTIONThe 3.6L in this vehicle is equipped with an Electro-Hydraulic Power Steering (EHPS) pump requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.
  1. Siphon the power steering reservoir.
  2. Disconnect and isolate the battery negative cable. Refer to «CABLES, BATTERY, REMOVAL»(ref-465932-S24943704712012042300000) .
  3. Disconnect the two EHPS pump electrical connectors and the wiring harness to bracket routing clip.
  4. Disconnect the supply and return lines from the EHPS pump.
  5. Remove the pressure and return line routing clip bolt from the pump bracket.
  6. Raise and support the vehicle. See «HOISTING»(ref-465919-S17385638482012042300000) .
  7. If equipped, remove the front skid plate. Refer to «PLATE, SKID, FRONT, REMOVAL»(ref-465925-S30284619522012042300000) or «PLATE, SKID, FRONT SUSPENSION, REMOVAL»(ref-465925-S37911096052012042300000) .
  8. Remove the pressure line retaining bolt and line from the EHPS pump.
  9. Loosen the routing clip retaining bolt and position the pressure line aside for access to remove the pump.
  10. Remove the three EHPS pump retaining bolts and remove the pump from the vehicle.
  11. Remove and transfer any necessary components.
  1. Siphon power steering reservoir.
  2. Remove the air cleaner body, refer to «AIR INTAKE SYSTEM»(ref-465933-S24879953342012042300000) or «AIR INTAKE SYSTEM»(ref-465934-S26640800322012042300000) .
  3. Remove the serpentine drive belt. Refer to «BELT, SERPENTINE, REMOVAL»(ref-465940-S20367993122012042300000) .
  4. Disconnect the supply hose (3) and the pressure line (4) at the power steering pump (1).
  5. Using the holes in the pulley for access, remove the three pump mounting bolts (5).
  6. Remove and transfer any necessary components.
CAUTIONThe 3.6L in this vehicle is equipped with an Electro-Hydraulic Power Steering (EHPS) pump requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.
  1. Position the EHPS pump, install the three retaining bolts and tighten to 54 N.m (40 ft. lbs.). NOTE: Make sure the O-ring is clean and seats properly.
  2. Position the pressure line routing clip under the bolt, install the pressure line into the pump and tighten the routing clip retaining bolt to 12 N.m (9 ft. lbs./106 in. lbs.).
  3. Install the pressure line routing clip to pump bracket retaining bolt and tighten to 20 N.m (15 ft. lbs./177 in. lbs).
  4. If equipped, install the front skid plate. Refer to «PLATE, SKID, FRONT, INSTALLATION»(ref-465925-S32552796172012042300000) or «PLATE, SKID, FRONT SUSPENSION, INSTALLATION»(ref-465925-S17703500932012042300000) .
  5. Remove the supports and lower the vehicle.
  6. Connect the supply and return lines to the EHPS pump.
  7. Connect the two EHPS pump electrical connectors and the wiring harness to bracket routing clip.
  8. Connect the battery negative cable.
  9. Refill the power steering fluid and bleed the system. Refer to «STANDARD PROCEDURE»(ref-465942-S26922506192012042300000) .
  1. Position the power steering pump (1) and using the holes in the pulley for access, install 3 pump mounting bolts (5) and tighten to 23 N.m (17 ft. lbs.).
  2. Install the pressure line (4) on the pump (1) and tighten the nut to 28 N.m (21 ft. lbs.).
  3. Install the supply hose (3) on the pump (1).
  4. Install the drive belt. Refer to «BELT, SERPENTINE, INSTALLATION»(ref-465940-S28892887022012042300000) .
  5. Install the air cleaner body, refer to «AIR INTAKE SYSTEM»(ref-465933-S24879953342012042300000) or «AIR INTAKE SYSTEM»(ref-465934-S26640800322012042300000) .
  6. Fill and bleed the system with power steering fluid. Refer to «STANDARD PROCEDURE»(ref-465942-S26922506192012042300000) .

5.7L - COOLER TO RESERVOIR

  1. Siphon the power steering fluid from the reservoir (2).
  2. Remove the air cleaner body (4), refer to «AIR INTAKE SYSTEM»(ref-465933-S24879953342012042300000) or «AIR INTAKE SYSTEM»(ref-465934-S26640800322012042300000) .
  3. Disconnect the upper return hose (3) at the reservoir (2).
  4. Remove the grille. Refer to «GRILLE, REMOVAL»(ref-465921-S35029314672012042300000) .
  5. Disconnect the clamp (2) and remove the hose from the cooler (1) and from the vehicle.

5.7L - RESERVOIR TO PUMP

  1. Siphon the power steering fluid from the reservoir (2).
  2. Remove the air cleaner body (4), refer to «AIR INTAKE SYSTEM»(ref-465933-S24879953342012042300000) or «AIR INTAKE SYSTEM»(ref-465934-S26640800322012042300000) .
  3. Disconnect the lower return hose (3) at the reservoir (2).
  4. Disconnect the return hose (3) at the pump (1).
  5. Remove the return hose (3) from the vehicle.

WITH EHPS - PRESSURE

CAUTIONThe 3.6L in this vehicle is equipped with an Electro-Hydraulic Power Steering (EHPS) pump requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.
  1. Siphon the power steering reservoir.
  2. Raise and support the vehicle. See «HOISTING»(ref-465919-S17385638482012042300000) .
  3. If equipped, remove the front skid plate. Refer to «PLATE, SKID, FRONT, REMOVAL»(ref-465925-S30284619522012042300000) or «PLATE, SKID, FRONT SUSPENSION, REMOVAL»(ref-465925-S37911096052012042300000) .
  4. Remove the pressure line routing clip bolt from the pump bracket.
  5. Remove the pressure line routing clip retaining bolts from the cradle.
  6. Remove the wiring harness routing clip from the pump bracket for access to remove the pressure line.
  7. Remove the pressure line retaining bolt (4) and pressure line (5) from the pump (3).
  8. Remove the pressure line fitting (1) from the gear (3) and remove the pressure line from the vehicle.

WITH EHPS - SUPPLY/RETURN

CAUTIONThe 3.6L in this vehicle is equipped with an Electro-Hydraulic Power Steering (EHPS) pump requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.

Scheme 48

Scheme 48
Scheme 48
  1. Siphon the power steering reservoir (2).
  2. Disconnect the supply hose (3) from the reservoir (2).
  3. Remove the engine air resonator assembly from between the throttle body and the air cleaner.
  4. Disconnect the supply hose from the routing clips.
  5. Disconnect the supply (2) and return (1) hoses from the EHPS pump (3).
  6. Raise and support the vehicle. See «HOISTING»(ref-465919-S17385638482012042300000) .
  7. If equipped, remove the front skid plate. Refer to «PLATE, SKID, FRONT, REMOVAL»(ref-465925-S30284619522012042300000) or «PLATE, SKID, FRONT SUSPENSION, REMOVAL»(ref-465925-S37911096052012042300000) .
  8. Remove the return line fitting (2) from the gear (3)
  9. Remove the supply/return line assembly routing clip bolt from the pump bracket.
  10. Remove the supply/return line assembly routing clip retaining bolts from the cradle and remove the assembly from the vehicle.

5.7L - PRESSURE HOSE, PUMP TO GEAR

  1. Position the line, slide retaining clip behind the forward retaining bolt (2) and tighten to 12 N.m (105 in. lbs.).
  2. Install the two mounting bracket (3) bolts for the pressure line at the engine cradle and tighten to 12 N.m (105 in. lbs.).
  3. Connect the power steering pressure line (1) to the power steering gear (3) and tighten to 28 N.m (21 ft. lbs.).
  4. If equipped, install the front skid plate. Refer to «PLATE, SKID, FRONT, INSTALLATION»(ref-465925-S32552796172012042300000) or «PLATE, SKID, FRONT SUSPENSION, INSTALLATION»(ref-465925-S17703500932012042300000) .
  5. Remove the supports and lower the vehicle.
  6. Connect the power steering pressure line (4) to the power steering pump (1) and tighten to 28 N.m (21 ft. lbs.).
  7. Install the air cleaner body, refer to «AIR INTAKE SYSTEM»(ref-465933-S24879953342012042300000) or «AIR INTAKE SYSTEM»(ref-465934-S26640800322012042300000) .
  8. Refill the power steering fluid and bleed the system. Refer to «STANDARD PROCEDURE»(ref-465942-S26922506192012042300000) .

5.7L - GEAR TO COOLER

  1. Position the hose (2) to the vehicle.
  2. Install the line to cooler clip retaining bolt and tighten to 12 N.m (105 in. lbs.).
  3. Connect the return hose (2) to the gear (3) and tighten to 28 N.m (21 ft. lbs.).
  4. Connect the hose to the cooler (1) and install the clamp (2).
  5. Install the front skid plate. Refer to «PLATE, SKID, FRONT, INSTALLATION»(ref-465925-S32552796172012042300000) or «PLATE, SKID, FRONT SUSPENSION, INSTALLATION»(ref-465925-S17703500932012042300000) .
  6. Install the grille. Refer to «GRILLE, INSTALLATION»(ref-465921-S22387054082012042300000) .
  7. Remove the supports and lower the vehicle.
  8. Refill the power steering reservoir (2) with fluid and bleed the system. Refer to «STANDARD PROCEDURE»(ref-465942-S26922506192012042300000) .
  1. Connect the hose to the cooler (1) and install the clamp (2).
  2. Connect the upper return hose (3) at the reservoir (2) and install the clamp.
  3. Install the grille. Refer to «GRILLE, INSTALLATION»(ref-465921-S22387054082012042300000) .
  4. Install the air cleaner body, refer to «AIR INTAKE SYSTEM»(ref-465933-S24879953342012042300000) or «AIR INTAKE SYSTEM»(ref-465934-S26640800322012042300000) .
  5. Refill the power steering fluid and bleed the system. Refer to «STANDARD PROCEDURE»(ref-465942-S26922506192012042300000) .
  1. Position the line (3) to the vehicle.
  2. Reconnect and clamp the power steering return hose (3) to the pump (1).
  3. Reconnect and clamp the lower return hose (3) to the reservoir (2).
  4. Install the air cleaner body, refer to «AIR INTAKE SYSTEM»(ref-465933-S24879953342012042300000) or «AIR INTAKE SYSTEM»(ref-465934-S26640800322012042300000) .
  5. Refill the power steering fluid and bleed the system. Refer to «STANDARD PROCEDURE»(ref-465942-S26922506192012042300000) .
CAUTIONThe 3.6L in this vehicle is equipped with an Electro-Hydraulic Power Steering (EHPS) pump requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.

Note. Make sure the O-ring is clean and seats properly.

  1. Position the pressure line in the vehicle, start the pressure line fitting (1) in the gear (3) and tighten to 28 N.m (21 ft. lbs.). NOTE: Make sure the O-ring is clean and seats properly.
  2. Insert the pressure line (5) into the pump (3), install the retaining bolt (4) and tighten to 20 N.m (15 ft. lbs./177 in. lb.).
  3. Install the pressure line to cradle routing clip bolts and tighten to 12 N.m (9 ft. lbs./106 in. lb.).
  4. Install the pressure line to pump bracket routing clip bolt and tighten to 8 N.m (71 in. lb.).
  5. Connect the wiring harness routing clip to the pump bracket.
  6. If equipped, install the front skid plate. Refer to «PLATE, SKID, FRONT, INSTALLATION»(ref-465925-S32552796172012042300000) or «PLATE, SKID, FRONT SUSPENSION, INSTALLATION»(ref-465925-S17703500932012042300000) .
  7. Remove the supports and lower the vehicle.
  8. Refill the power steering system with fluid and bleed the system. Refer to «STANDARD PROCEDURE»(ref-465942-S26922506192012042300000) .
CAUTIONThe 3.6L in this vehicle is equipped with an Electro-Hydraulic Power Steering (EHPS) pump requiring a different fluid. Do not mix power steering fluid types. Damage may result to the power steering pump and system if any other fluid is used. The EHPS system uses fluid which meets material specification MS-11655 or equivalent. Do not overfill.
  1. Position the supply/return line assembly in the vehicle, start the return line fitting (2) in the gear (3) and tighten to 28 N.m (21 ft. lbs.).
  2. Install the supply/return line assembly to cradle routing clip bolts and tighten to 12 N.m (9 ft. lbs./106 in. lb.).
  3. Install the supply/return line to pump bracket routing clip bolt and tighten to 8 N.m (71 in. lb.).
  4. If equipped, install the front skid plate. Refer to «PLATE, SKID, FRONT, INSTALLATION»(ref-465925-S32552796172012042300000) or «PLATE, SKID, FRONT SUSPENSION, INSTALLATION»(ref-465925-S17703500932012042300000) .
  5. Remove the supports and lower the vehicle.
  6. Connect the supply (1) and return (2) hoses to the EHPS pump (3).
  7. Attach the supply hose to all routing clips as removed.
  8. Connect the supply hose to the reservoir (2) with the clamp (3).
  9. Install the engine air resonator assembly between the throttle body and the air cleaner.
  10. Refill the power steering system with fluid and bleed the system. Refer to «STANDARD PROCEDURE»(ref-465942-S26922506192012042300000) .

Scheme 49

Scheme 49: REMOVAL
Scheme 49: REMOVAL
CAUTIONDo not reuse the old power steering pump pulley it is not intended for reuse. A new pulley must be installed if removed.
  1. Remove the power steering pump assembly. Refer to «PUMP, REMOVAL»(ref-465942-S21726515062012042300000) .
  2. Remove the pulley (2) from the pump (1) using (OTC® 7185) power steering pulley removal tool (3) or equivalent.

Scheme 50

Scheme 50: INSTALLATION
Scheme 50: INSTALLATION

Note. Power steering pulley (1) must only be installed to the first notch (2) on the pulley Do not install the pulley flush to the hub (3).

Scheme 51

Scheme 51
Scheme 51
CAUTIONDo not reuse the old power steering pump pulley it is not intended for reuse. A new pulley must be installed if removed.
  1. Replace the pulley if it's bent, cracked, or loose.
  2. Install the pulley (2) on the pump (1) using (OTC® 7771) power steering pulley installation tool (3) or equivalent to the first notch. Make sure the tool and pulley remain aligned with the pump shaft.
  3. Install the power steering pump assembly. Refer to «PUMP, INSTALLATION»(ref-465942-S22978166622012042300000) .
  4. Run engine until warm (5 min.) and note any belt chirp. If chirp exists, move pulley outward approximately 0.5 mm (0.020 in.). If noise increases, press on 1.0 mm (0.040 in.). Be careful that pulley does not contact mounting bolts.

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