Power Steering System Acura TL IV

Scheme 1

Scheme 2

Scheme 3

1. Turn the front wheels to the straight ahead position
2. Measure how far you can turn the steering wheel left and right without moving the front wheels If the play is within the limit, the steering gearbox and the steering linkage are OK If the play exceeds the limit, adjust the rack guide (see «RACK GUIDE ADJUSTMENT»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__rack-guide-adjustment) ) If the play is still excessive after rack guide adjustment, inspect the steering linkage and the steering gearbox (see «STEERING LINKAGE AND GEARBOX INSPECTION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) Rotational play. 0-10 mm (0-0 39 in)

Power Assist Check

Note. This test should be done with original equipment tires and wheels at the correct tire pressure

Scheme 4

1. Start the engine, and let it idle
2. Attach a commercially available spring scale to the steering wheel With the engine idling and the vehicle on a clean, dry floor, pull the scale as shown, and read it as soon as the tires begin to turn
3. If the scale reads no more than 29 N (3 0 kgf, 6 6 lbf), the power assist is OK If it reads more, check these items

1. Steering linkage (see «STEERING LINKAGE AND GEARBOX INSPECTION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
2. Rack guide adjustment (see «RACK GUIDE ADJUSTMENT»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__rack-guide-adjustment) )
3. EPS system (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )

Scheme 5

Steering Wheel Removal

SRS components are located in this area Review the SRS component locations (see COMPONENT LOCATION INDEX ) and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or service

Scheme 6

Scheme 7

Scheme 8

1. Do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) )
2. Align the front wheels straight ahead, then remove the driver's airbag from the steering wheel (see «DRIVER'S AIRBAG REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system__drivers-airbag-replacement) )
3. Disconnect the cable reel subharness connector (A).
4. Loosen the steering wheel bolt (B, (10x1.25mm)).
5. Install a commercially available steering wheel puller (A) on the steering wheel (B) Free the steering wheel from the steering column shaft by turning the pressure bolt (C) of the puller Note these items when removing the steering wheel Do not tap on the steering wheel or the steering column shaft when removing the steering wheel If you thread the puller bolts (D) into the wheel hub more than five threads, the bolts will hit the cable reel and damage it To prevent this, install a pair of jam nuts five threads upon each puller bolt
6. Remove the steering wheel puller, then remove the steering wheel center bolt and the steering wheel from the steering column

Scheme 9

Steering Wheel Installation

SRS components are located in this area Review the SRS component locations (see COMPONENT LOCATION INDEX ), and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or service

Scheme 10

Scheme 11

Scheme 12

1. Before installing the steering wheel, make sure the front wheels are pointing straight ahead, then center the cable reel (A) Do this by first rotating the cable reel clockwise until it stops Then rotate it counterclockwise about three full turns The arrow mark (B) on the cable reel label should point straight up
2. Position the two tabs (A) of the turn signal canceling sleeve (B) as shown Install the steering wheel on to the steering column shaft, making sure the steering wheel hub (C) engages the pins (D) of the cable reel and the tabs of the turn signal canceling sleeve Do not tap on the steering wheel or steering column shaft when installing the steering wheel
3. Install the steering wheel bolt (A), and tighten it to the specified torque Connect the cable reel subharness connector (B) Make sure the wire harness is routed and fastened properly
4. Install the driver's airbag (see «DRIVER'S AIRBAG REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system__drivers-airbag-replacement) )
5. Do the battery terminal reconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) ), and do these tasks Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and check that the SRS indicator comes on for about 6 seconds and then goes off Make sure the horn and turn signal switches work properly Make sure the steering wheel switches work properly
6. After installation, do these checks Check the steering wheel spoke angle If the steering spoke angles to the right and left are not equal (steering wheel is not centered), correct the engagement of the wheel/column shaft splines With SH-AWD Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) )

Steering Column Removal and Installation

SRS components are located in this area Review the SRS component locations (see COMPONENT LOCATION INDEX ) and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) before doing repairs or service

Scheme 13

Scheme 14

Scheme 15

1. Adjust the steering column to the full tilt down position, and to the full telescopic out position
2. Do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) )
3. Remove the driver's airbag (see «DRIVER'S AIRBAG REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system__drivers-airbag-replacement) ), and the steering wheel (see «STEERING WHEEL REMOVAL»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-wheel-removal) )
4. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) )
5. Remove the column covers (see «SIDE DEFOGGER VENT TRIM REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard__side-defogger-vent-trim-removalinstallation) )
6. Remove the steering joint cover (A)
7. Loosen the upper steering joint bolt (A), and remove the lower steering joint bolt (B) Disconnect the steering joint (C) by sliding the steering joint into the column Tighten the upper steering joint bolt to hold the steering joint in place Do not disconnect the steering joint from the column shaft (D) NOTE: If the center guide (E) is in place and has not moved, leave it in place If the center guide has come off, discard it
8. Disconnect the wire harness connectors from the combination switch assembly/cable reel (A)
9. Remove the combination switch assembly/cable reel from the steering column shaft by removing the three screws (B)
10. Disconnect the connectors from the ignition switch, and release the wire harness clips from the steering column
11. Remove the steering column (C) by removing the attaching nuts and bolts, and carefully guide it out of the dashboard

Scheme 16

Scheme 17

Scheme 18

Scheme 19

1. Install the steering column in the reverse order of removal, and note these items Make sure the wires are not caught or pinched by any parts Tighten the three screws (A) in the sequence shown.
2. Center the steering rack within its stroke
3. Loosen the upper steering joint bolt (A) and slip the lower end of the steering joint (B) onto the pinion shaft (C) NOTE: Pinion shaft with center guide Install steering joint by aligning the center guide (D) Pinion shaft without center guide Position the steering column by aligning the gap (E) with the angle
4. Align the bolt hole (A) on the steering joint with the groove (B) around the pinion shaft, then loosely install the lower steering joint bolt (C) Be sure that the joint bolt is securely in the groove in the pinion shaft
5. Pull on the steering joint to make sure that the steering joint is fully seated, then tighten the lower joint bolt to the specified torque
6. Tighten the upper steering joint bolt (D) to the specified torque
7. Install the steering joint cover (A)
8. Install the column covers (see «SIDE DEFOGGER VENT TRIM REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard__side-defogger-vent-trim-removalinstallation) )
9. Install the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) )
10. Install the steering wheel (see «STEERING WHEEL INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-wheel-installation) ), and the driver's airbag (see «DRIVER'S AIRBAG REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system__drivers-airbag-replacement) )
11. Do the battery terminal reconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) ), and do these tasks Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and check that the SRS indicator comes on for about 6 seconds and then goes off Make sure the horn and turn signal switches work properly Make sure the steering wheel switches work properly
12. After installation, do these checks Check the steering wheel spoke angle If the steering spoke angles to the right and left are not equal (steering wheel and rack are not centered), correct the engagement of the joint/pinion shaft splines With SH-AWD Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) ) Set the steering column to the center tilt position, and to the center telescopic position, then do the front toe inspection (see «WHEEL ALIGNMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__wheel-alignment) )

Scheme 20

1. Remove the steering column (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-column-removal-and-installation) )
2. Do these checks Check for loose bearing mounting nuts (A) If they are loose, replace the column as an assembly Check the steering column ball bearings (B) and the steering joints (C) for play and proper movement If any bearing is noisy or has excessive play, replace the steering column as an assembly Check the sliding capsules (D) for distortion or breakage If there is distortion or breakage, replace the steering column as an assembly Check the tilt mechanism and telescopic mechanism for movement and damage
3. Install the steering column (see «INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )

Scheme 21

1. Set the steering wheel in the straight ahead driving position, and loosen the lock lever fully
2. Attach the spring scale to the highest point of the steering wheel, and tilt the steering column to the lowest position
3. Pull the spring scale straight up, and read the force required to move the steering column
4. Attach the spring scale to the lowest point of the steering wheel
5. Pull the spring scale straight down, and read the force required to move the steering column Tilting force (upward/downward). Standard 70 N (7 1 kgf, 15 lbf) max
6. If the measurement is higher than specified, replace the steering column as an assembly (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-column-removal-and-installation) )

Scheme 22

1. Set the steering wheel in the straight ahead driving position, and loosen the lock lever fully
2. Attach the spring scale (A) to the center point of the steering wheel as shown
3. Pull the spring scale, and read the force required to move the steering column during telescoping Telescoping force Standard 116 N (11 8 kgf, 26 1 lbf) max
4. If the measurement is higher than specified, replace the steering column as an assembly (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-column-removal-and-installation) )

Scheme 23

Scheme 24

1. Move the lock lever (A) from the loosened position to the locked position three to five times, then release the lock lever Adjust the steering column to the center tilt position and also to the full telescopic out position, and hold the steering wheel
2. Using a commercially available push-pull gauge, push the lock lever 10 mm (0 39 in) in from its end, and measure the force required to move lock lever Lock lever force 50-70 N (5 1-7 1 kgf, 11-16 lbf) mm
3. If the measurement is out of the specification, adjust the preload using the following procedures Remove the steering wheel (see «STEERING WHEEL REMOVAL»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-wheel-removal) ), then remove the column covers (see «SIDE DEFOGGER VENT TRIM REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard__side-defogger-vent-trim-removalinstallation) ) Adjust the preload by turning the nut (A) Check the preload again If the measurement is still out of specification, repeat the above procedures to adjust Install the column covers (see «SIDE DEFOGGER VENT TRIM REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard__side-defogger-vent-trim-removalinstallation) ), then install the steering wheel (see «STEERING WHEEL INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-wheel-installation) )

Scheme 25

Scheme 26

1. Remove the steering column (see «STEERING COLUMN REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-column-removal-and-installation) )
2. Center-punch both of the shear bolts, and drill their heads off with a 5 mm (3/16 in) drill bit Be careful not to damage the switch body when removing the shear bolts
3. Remove the shear bolts from the switch body
4. Install the switch body without the key inserted
5. Loosely tighten the new shear bolts
6. Insert the ignition key, and check for proper operation of the steering wheel lock and that the ignition key turns freely
7. Tighten the shear bolts (A) until the hex heads (B) twist off
8. Rewrite the new immobilizer control unit-receiver (see «IMMOBILIZER KEY REGISTRATION»(/acura/tl/iv-2008-2011/remont/door-locks-anti-theft-systems/#immobilizer-system__immobilizer-key-registration) ), and make sure the immobilizer system works properly
9. Install the steering column (see «INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )

Rack Guide Adjustment

Special Tools Required

Locknut wrench, 40 mm 07MAA-SL00100

Scheme 27

Scheme 28

Scheme 29

1. Set the wheels in the straight ahead position
2. Loosen the rack guide screw locknut (A) with the locknut wrench, then remove the rack guide screw (B)
3. Remove the old sealant from the rack guide screw (A), and apply new sealant (Three Bond 1215 or Loctite 5699) to the middle of the threads (B) Loosely install the rack guide screw on the steering gearbox NOTE: If more than 5 minutes has passed after applying the sealant, remove the old sealant and residue, and reapply new sealant
4. Tighten the rack guide screw (A) to 25 N m (2 5 kgf m, 18 lbf ft), then loosen it
5. Retighten the rack guide screw to 5 9 N m (0 6 kgf m, 4 lbf ft), then back it off to the specified angle Specified return angle 10 ± 5 °
6. Hold the rack guide screw stationary with a wrench, and tighten the locknut by hand until it's fully seated
7. Install the locknut wrench on the locknut (B), and hold the rack guide screw stationary with a wrench Tighten the locknut to the specified torque
8. Check for unusual steering effort through the complete turning range
9. Check the steering wheel rotation play (see «STEERING WHEEL ROTATIONAL PLAY CHECK»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) and the power assist (see «STEERING WHEEL ROTATIONAL PLAY CHECK»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )

Tie-rod End Ball Joint Boot Replacement

Special Tools Required

Front hub dis/assembly tool 07965-SA50500

Scheme 30

Scheme 31

1. Disconnect the tie-rod end ball joint from the knuckle (see step 13 on «REMOVAL»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
2. Remove the tie-rod end from the rack end
3. Remove the ball joint boot from the tie-rod end, and wipe the old grease off the ball pin
4. Pack the lower area of the ball pin (A) with fresh multipurpose grease
5. Pack the interior of the new tie-rod ball joint boot (B) and lip (C) with fresh multipurpose grease Note these items when installing new grease Keep grease off the boot mounting area (D) and the tapered section (E) of the ball pin Do not allow dust, dirt, or other foreign materials to enter the boot
6. Install the new tie-rod end ball joint boot (A) using the front hub dis/assembly tool The boot must not have a gap at the boot installation sections (B) After installing the boot, check the ball pin tapered section for grease contamination, and wipe it if necessary
7. Install the tie-rod end to the rack end
8. Connect the tie-rod end ball joint to the knuckle (see step 40 on «INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
9. Check the wheel alignment, and adjust it if necessary (see «WHEEL ALIGNMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__wheel-alignment) )

Scheme 32

Scheme 33

Scheme 34

1. Remove the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )
2. Position a 36 mm socket (A) on the flange part of the gearbox housing with a washer (B), a 10 x 150 mm flange bolt (C) and a 10 mm nut (D) as shown
3. Hold the flange bolt with a wrench, and tighten the nut with a wrench Remove the gearbox mount cushion (E)
4. Apply a mild soap and water solution to the new gearbox mount cushion surface (A), then place it on the gearbox mounting cushion hole
5. Position a 36 mm socket on the flange part of the gearbox housing with a washer, a flange bolt, and the nut as shown
6. Install the gearbox mount cushion by tightening the nut until the mount cushion edge (A) properly fit on the gearbox flange surface (B)
7. Install the steering gearbox (see «INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )

Scheme 35

EPS Indicator

Under normal conditions, the EPS indicator (A) comes on when the ignition switch is turned to ON (II), or press the engine start/stop button to select the ON mode, then goes off after the engine is started. This indicates that the LED and its circuit are operating correctly If there is a failure in the system after the engine is started, the EPS indicator will stay on, and the power assist is turned off or restricted

Scheme 36

When the EPS indicator comes on, the control unit stores the DTC. In this case, the control unit will not activate the EPS system after the engine starts again, but it keeps the EPS indicator on

When DTC 51-01,51-02 or 51-06 is stored in the control unit, the EPS indicator will stay on until the DTC is erased When a problem is detected and the EPS indicator comes on, there are cases when the indicator stays on until the ignition switch is turned to LOCK (0), or press the engine start/stop button to select the OFF mode, and cases when the indicator goes off automatically when the system returns to normal. Even though the system is operating normally, the EPS indicator will come on under some conditions with the vehicle stopped and the engine at high rpm with constant input from the steering wheel

To determine the actual cause of the problem, question the client about the conditions during which the problem occurred, taking the above conditions into consideration

Diagnostic Trouble Code (DTC)

1. If the CPU cannot be activated, or it fails, the EPS indicator comes on, but the DTC is not stored
2. The memory can hold any number of DTCs However, when the same DTC is detected more than once, the most recent DTC is written over the prior DTC, therefore only one occurrence is stored
3. The lowest DTC is indicated first The DTCs are indicated in ascending order, not in the order that they occurred
4. The DTCs are stored in the EEPROM (non-volatile memory) therefore the stored DTCs cannot be erased by disconnecting the battery Do the specified procedures to clear the DTCs

Self-diagnosis

Self-diagnosis can be classified into three categories

1. Initial diagnosis Done right after the engine starts and until the EPS indicator goes off
2. Regular diagnosis Done right after the initial diagnosis until the ignition switch is turned to LOCK (0), or press the engine start/stop button to select the OFF mode
3. Steering diagnosis Done during regular diagnosis while turning the steering wheel

The EPS control unit does these functions when a problem is detected by self-diagnosis

1. Turns on the EPS indicator
2. Stores the DTC
3. Stops power assist and manual steering operation resumes NOTE: For DTCs 11-01,11-02,12-01,21-01,21-02, 22-01, 35-04, 36-02, and 37-01 the EPS indicator will go off automatically, and the system returns to normal

Restriction on Power Assist Operation

Repeated extreme steering force, such as turning the steering wheel continuously back-and-forth with the vehicle stopped, causes an increase in electrical current draw by the EPS motor The increase of electric current causes the EPS motor to heat up Because this heat adversely affects the system, the control unit monitors the electric current draw of the EPS motor

When the control unit detects heat build-up in the EPS motor, it reduces the electric current to the EPS motor gradually to protect the system, and it restricts the power assist operation The EPS indicator does not come on during this function

When steering torque is not applied to the steering wheel, or when the ignition is turned to LOCK (0), or press the engine start/stop button to select the OFF mode and the EPS motor cools, the control unit will restore the power assist gradually until it's fully restored (after about 8 minutes)

Torque Sensor Neutral Position

The EPS control unit stores the torque sensor neutral position in the EEPROM The torque sensor neutral position must be memorized whenever the gearbox or the EPS control unit is replaced

Note. The torque sensor neutral position is not affected when erasing the DTCs

How to Troubleshoot DTCs

The troubleshooting procedures assume that the cause of the problem is still present and the EPS indicator is still on Following the procedure when the EPS indicator does not come on can result in incorrect diagnosis

1. Question the client about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting Find out when the EPS indicator came on, such as while turning, after turning, when the vehicle was at a certain speed, etc
2. When the EPS indicator does not come on during the test-drive, but troubleshooting is done based on the DTC, check for loose connectors, poor terminal contact, etc, in the affected circuit before you start troubleshooting
3. After troubleshooting, clear the DTC and test-drive the vehicle Be sure the EPS indicator does not come on

Scheme 37

1. If the system indicators stay on, connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
3. Make sure the HDS communicates with the vehicle and the EPS control unit If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) )
4. Check the diagnostic trouble code (DTC) and note it Then refer to the indicated DTC's troubleshooting, and do the appropriate troubleshooting procedure NOTE: The HDS reads the DTC, the current data, and other system data For specific operations, refer to the that came with the HDS

How to Retrieve DTCs

1. With the ignition switch in LOCK(O), or the engine start/stop button in select the OFF mode, connect the HDS to the data link connector (DLC) under the driver's side of the dashboard
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
3. Make sure the HDS communicates with the vehicle and the EPS control unit If it doesn't troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) )
4. Follow the prompts on the HDS to display the DTC(s) on the screen After determining the DTC, refer to the «DTC TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) Do the all systems DTC check, and troubleshoot any powertrain DTCs first
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode

How to Clear DTCs

1. With the ignition switch in LOCK (0), or the engine start/stop button in select the OFF mode, connect the HDS to the data link connector (DLC) under the driver's side of the dashboard
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
3. Make sure the HDS communicates with the vehicle and the EPS control unit If it doesn't troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) )
4. Clear the DTC(s) by following the screen prompts on the HDS
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode

Memorizing the Torque Sensor Neutral Position

The torque sensor neutral position must be memorized whenever the steering gearbox or the EPS control unit is replaced Note that the torque sensor neutral position is not affected when erasing the DTC

Note. The torque sensor is temperature sensitive When memorizing the torque sensor neutral position, the ambient temperature must be above 68°F (20°C)

Scheme 38

1. With the ignition switch in LOCK (0) or with the vehicle ignition in the OFF mode, connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
3. Make sure the HDS communicates with the vehicle and the EPS control unit If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) )
4. From the EPS MENU, select MISCELLANEOUS TEST, then TORQUE SENSOR LEARN, and follow the screen prompts on the HDS NOTE: See the for specific instructions
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode

DTC Troubleshooting Index

DTC TROUBLESHOOTING CHART

Note. Initial diagnosis Done right after the engine starts and until the EPS indicator goes off Regular diagnosis Done right after the initial diagnosis until the ignition switch is turned to LOCK (0), or press the engine start/stop button to select the OFF mode Steering diagnosis Done during regular diagnosis while turning the steering wheel

Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING CHART

Scheme 39

CONNECTOR TERMINALS DESCRIPTION CHART

Scheme 40

CONNECTOR TERMINALS DESCRIPTION CHART

Scheme 41

CONNECTOR TERMINALS DESCRIPTION CHART

Scheme 42

CONNECTOR TERMINALS DESCRIPTION CHART

System Outline

The TL is equipped with electric power steering (EPS) The driver's steering force is assisted by an electric motor at the steering gearbox Compared to a hydraulic assist power steering system, the EPS is more efficient because it does not use engine power to drive an oil pump to generate hydraulic pressure

The system uses an EPS control unit to monitor and control the EPS motor's assisting force to match driving conditions

1. Low vehicle speeds High power assist (for easy handling)
2. High speed driving Low power assist (for stable handling)
3. Low speed to high speed driving Change smoothly from high assist to low assist

System Operation

The steering force from the steering wheel is sent to the pinion shaft The torque sensor measures the difference between the force applied to the pinion shaft and the resistance to turning the wheels due to road friction The torque sensor converts steering torque input and its direction into voltage signals that are sent to the EPS control unit The EPS control unit uses these signals along with the engine and the vehicle speed signals from the PCM to calculate the direction and the amount of assist needed The EPS control unit then sends out the appropriate command to the EPS motor The EPS motor transmits its power through a ball screw mechanism to push the steering rack right or left

Scheme 43

Torque Sensor Operation

When the steering wheel is turned, inductance is changed by the movement of the core within the Torque Sensor The amount this voltage changes varies with the amount of movement, and direction of the core, then is amplified by the interface circuitry of the sensor coil and output to the EPS control unit as a steering signal

Scheme 44

EPS Control Unit Operation

The EPS control unit controls the EPS motor by these signals

1. Vehicle speed signal (for PCM)
2. Engine speed signal (for PCM)
3. Torque sensor signal

At idle or low vehicle speeds, the EPS control unit sends a signal to the PCM to increase the engine idle speed to prevent the engine from stalling

If the EPS control unit detects a failure in the system, it stores a DTC and sends a signal to the gauge control

Scheme 45

Power relay (built into the EPS control unit)

When the system is operating normally, the CPU turns the power relay on, and the power is provided to the FET bridge If the CPU detects a failure in the system which has the demand to shut down the system, the CPU turns the power relay off

Fail-safe relay (built into the EPS control unit)

When the system is operating normally, the CPU turns the fail-safe relay on and power is provided to the EPS motor If the CPU detects a failure in the system, the CPU turns the fail-safe relay off at the same time it turns the power relay off

Current sensor

An electric current detection circuit monitors the current of each phase circuit to the motor and sends a signal to the CPU

EPS motor operation

The EPS uses an efficient brush less DC type motor The EPS motor control circuit is composed of a system control CPU, FET drive circuit, H type FET bridge, power relay, fail-safe relay, electric current sensor, and the EPS motor From the input sensor signals, the CPU calculates and outputs the appropriate three-phase current for the FET drive circuit

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Wait at least 60 seconds
6. Check for DTCs with the HDS Is DTC 11-01 indicated? YES -Go to step 7 NO -Check for loose terminals or poor connections If the connections are good, the system is OK at this time
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
8. Disconnect EPS control unit connector D (28P)
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
10. Wait at least 60 seconds
11. Measure the voltage between EPS control unit connector D (28P) terminal No 16 and body ground Is there battery voltage? YES -Check for loose terminals in the EPS control unit connectors and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -If there is no voltage, or the voltage is lower than specified, repair an open or high resistance in the wire between the No 6 (7 5 A) fuse in the driver's under-dash fuse/relay box and EPS control unit If the wire checks OK, check the battery (see «BATTERY TEST»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) ), and troubleshoot the alternator regulator circuit (see «ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/charging-system/#charging-system__alternator-and-regulator-circuit-troubleshooting) )

Scheme 51

Scheme 52

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Check the BATTERY in the EPS DATA LIST with the HDS Is there battery voltage? YES -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the EPS control unit NO -Go to step 3
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Check the No 2-1 (EPS) (70 A) fuse in the under-hood fuse/relay box Is the fuse blown? YES -Go to step 5 NO -Reinstall the checked fuse, then go to step 13
5. Disconnect EPS control unit connector A (2P)
6. Check for continuity between EPS control unit connector A (2P) terminal No 2 and body ground Is there continuity? YES -Repair short to body ground in the wire between the EPS control unit and the No 2-1 (EPS) (70 A) fuse in the under-hood fuse/relay box NO -Install a new No 2-1 (EPS) (70 A) fuse in the under-hood fuse/relay box, then go to step 7
7. Reconnect EPS control unit connector A (2P)
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
9. Clear the DTC with the HDS
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
11. Start the engine
12. Check for DTCs with the HDS Is DTC 12-01 indicated? YES -Replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Troubleshooting is complete
13. Disconnect EPS control unit connector A (2P)
14. Measure the voltage between EPS control unit connector A (2P) terminal No 2 and body ground Is there battery voltage? YES -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Repair open in the wire between the EPS control unit and the No 2-1 (EPS) (70 A) fuse in the under-hood fuse/relay box

DTC 21-01: Excessive Change of the Vehicle Speed Signal (Regular Diagnosis); DTC 21-02: Comparison between the Vehicle Speed and the Engine Speed Signal (Regular Diagnosis)

Note. If the MIL is on, troubleshoot the fuel and emissions systems first Even though the system is operating normally, the EPS indicator will come on caused by the detecting condition of DTC 21-01 or DTC 21-02 when you raise the engine speed with the vehicle stopped Clear the DTC related to the ABS or VSA

Scheme 53

Scheme 54

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
2. Raise the vehicle, and support it with safety stands in the proper locations (see «LIFT AND SUPPORT POINTS»(/acura/tl/iv-2008-2011/remont/hoistjack/#general-information__lift-and-support-points) ), and allow all wheels to rotate freely
3. Connect the HDS to the data link connector (DLC)
4. Turn off the VSA function by using the VSA OFF switch
5. Start the engine, then run the vehicle in D position
6. Check the VEHICLE SPEED in the EPS DATA LIST with the HDS Is the vehicle speed indicated? YES -The system is OK at this time NO -Go to step 7
7. Check for DTCs in the A/T system with the HDS Is DTC P0721, P0722, or P0723 indicated? YES -Troubleshoot the indicated DTC(s) NO -Go to step 8
8. Start the engine, and check the tachometer Is the tachometer working correctly? YES -Go to step 10 NO -Go to step 9
9. Check for DTCs in the gauge control module with the HDS Is DTC indicated? YES -Troubleshooting the indicated DTC(s) NO -Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 1 and recheck If the PCM was updated and DTCs are not indicated, troubleshooting is complete If the PCM was substituted and DTCs are not indicated, replace the original PCM (see «ECM/PCM REPLACEMENTECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) )
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
11. Short the SCS line with the HDS
12. Disconnect EPS control unit connector D (28P) and PCM connector A (49P)
13. Check for continuity between EPS control unit connector D (28P) terminal No 1 and PCM connector A (49P) terminal No 48 Is there continuity? YES -Go to step 14 NO -Repair open in the wire between the EPS control unit and the PCM
14. Check for continuity between EPS control unit connector D (28P) terminal No 15 and PCM connector A (49P) terminal No 49 Is there continuity? YES -Replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Repair open in the wire between the EPS control unit and the PCM

DTC 22-01: Engine Speed Signal (Initial Diagnosis)

Note. If the MIL indicator is on, troubleshoot the fuel and emissions systems first

Scheme 55

Scheme 56

Scheme 57

1. Start the engine
2. Check the ENGINE SPEED in the EPS DATA LIST with the HDS Is there 0 rpm at idle? YES -Go to step 3 NO -The system is OK at this time
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Disconnect EPS control unit connector D (28P)
5. Start the engine.
6. Measure the voltage between EPS control unit connector D (28P) terminal No 3 and body ground Is there any voltage? YES -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Go to step 7
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
8. Short the SCS line with the HDS
9. Disconnect PCM connector A (49P)
10. Check for continuity between EPS control unit connector D (28P) terminal No 3 and body ground Is there continuity? YES -Repair short to body ground in the wire between the EPS control unit and the PCM NO -Go to step 11
11. Check for continuity between EPS control unit connector D (28P) terminal No 3 and the PCM connector A (49P) terminal No 33 Is there continuity? YES -Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 1 and recheck If the PCM was updated and DTCs are not indicated, troubleshooting is complete If the PCM was substituted and DTCs are not indicated, replace the original PCM (see «ECM/PCM REPLACEMENTECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ) NO -Repair open in the wire between the EPS control unit and the PCM

DTC 31-01; Torque Sensor Neutral Position Not Memorized (Initial Diagnosis)

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Do the memorizing of the torque sensor neutral position (see «MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__memorizing-the-torque-sensor-neutral-position) )
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
6. Check for DTCs with the HDS Is DTC 31-01 indicated? YES -Replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -The system is OK at this time

DTC 32-01: EPS Control Unit Internal Circuit (Current Sensor) (Initial Diagnosis); DTC 32-02: EPS Control Unit Internal Circuit (Current Sensor) (Regular Diagnosis); DTC 35-01: EPS Control Unit Internal Circuit (CPU) (Initial Diagnosis/Regular Diagnosis); DTC 35-02: EPS Control Unit Internal Circuit (EEPROM) (Initial Diagnosis); DTC 35-04: EPS Control Unit Internal Circuit (CPU Communication) (Regular Diagnosis); DTC 35-07: EPS Control Unit Internal Circuit (INHL/INHR Ports) (Initial Diagnosis/Regular Diagnosis); DTC 36-02: EPS Control Unit Internal Circuit (INH Output Circuit) (Initial Diagnosis); DTC 37-01: EPS Control Unit Internal Circuit (Step-up Circuit) (Initial Diagnosis)

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Check for DTCs with the HDS Is DTC 32-01, 32-02, 35-01, 35-02, 35-04, 35-07, 36-02, or 37-01 indicated? YES -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time

DTC 32-07: EPS Control Unit Internal Circuit (Current Sensor) (Steering Diagnosis)

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Turn the steering wheel to the right or left, and wait 10 seconds or more
6. Check for DTCs with the HDS Is DTC 32-07 indicated? YES -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time

Scheme 58

Scheme 59

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Turn the steering wheel to the right or left, and wait 10 seconds or more
6. Check for DTCs with the HDS Is DTC 32-08 or 32-09 indicated? YES -Go to step 7 NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
8. Disconnect EPS control unit connector B (2P) and connector C (2P)
9. Check for continuity between the following terminals of EPS control unit connector B (2P) and connector C(2P) Is there continuity? YES -Check for loose terminals in the EPS control unit connectors and EPS motor connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Go to step 10
10. Disconnect the EPS motor 3P connector
11. On the EPS motor side, check for continuity between the EPS motor 3P connector terminals No 1 and No 2, No 1 and No 3, and No 2 and No 3 individually Is there continuity? YES -Repair open in the wire between the EPS control unit and the EPS motor NO -Open in the EPS motor wire, or EPS motor internal circuit, replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )

Scheme 60

Scheme 61

Scheme 62

Scheme 63

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Check for DTCs with the HDS Is DTC 33-01 or 33-06 indicated? YES -Go to step 6 NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
7. Disconnect EPS control unit connector B (2P) and connector C (2P)
8. Check for continuity between body ground and EPS control unit connector B (2P) terminal No 1, connector C (2P) terminal No 1, and connector C (2P) terminal No 2 individually Is there continuity? YES -Go to step 9 NO -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
9. Disconnect the EPS motor 3P connector
10. Check for continuity between body ground and EPS control unit connector B (2P) terminal No 1, connector C (2P) terminal No 1, and connector C (2P) terminal No 2 individually Is there continuity? YES -Repair short to body ground in the wire between the EPS control unit and the EPS motor NO -Short to body ground in the EPS motor wire, or a short in the EPS motor internal circuit, replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )

Scheme 64

Scheme 65

Scheme 66

Scheme 67

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Check for DTCs with the HDS Is DTC 33-02 or 33-07 indicated? YES -Go to step 6 NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
7. Disconnect EPS control unit connector B (2P) and connector C(2P)
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
9. Measure the voltage between body ground and EPS control unit connector B (2P) terminal No 1, connector C (2P) terminal No 1, and connector C (2P) terminal No 2 individually Is there battery voltage? YES -Go to step 10 NO -Check for loose terminals in the EPS control unit connectors and the EPS motor connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
11. Disconnect the EPS motor 3P connector
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
13. Measure the voltage between body ground and EPS control unit connector B (2P) terminal No 1, connector C (2P) terminal No 1, and connector C (2P) terminal No 2 individually Is there battery voltage? YES -Repair short to power in the wire between the EPS control unit and the EPS motor NO -Short to power in the EPS motor wire, or a short in the EPS motor internal circuit, replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )

DTC 34-01: Power Relay Stuck ON (Ignition Switch is in LOCK (0))

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
5. Check for DTCs with the HDS Is DTC 34-01 indicated? YES -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time

Scheme 68

Scheme 69

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
5. Check for DTCs with the HDS Is DTC 34-02 indicated? YES -Go to step 6 NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
7. Disconnect EPS control unit connector B (2P) and connector C(2P)
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
9. Measure the voltage between body ground and EPS control unit connector B (2P) terminal No 1, connector C (2P) terminal No 1, and connector C (2P) terminal No 2 individually Is there battery voltage? YES -Repair short to power in the wire between the EPS control unit and the EPS motor NO -Replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )

DTC 35-05: EPS Control Unit Internal Circuit (EPS Motor/EPS CPU) (Initial Diagnosis)

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Wait 10 seconds or more
6. Check for DTCs with the HDS Is DTC 35-05 indicated? YES -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time

Scheme 70

Scheme 71

Scheme 72

Scheme 73

Scheme 74

Scheme 75

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Check the ADVT 1 in the EPS DATA LIST with the HDS Is the voltage at 1 45-4 10 V? YES -Go to step 3 NO -Go to step 4
3. Check the ADVT 2 in the EPS DATA LIST with the HDS Is the voltage at 1 56-4 28 V? YES -Check for loose terminals or poor connections If the connections are good, the system is OK at this time NO -Go to step 4
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
5. Disconnect EPS control unit connector D (28P)
6. Measure the resistance between EPS control unit connector D(28P) terminals No 9 and No 10 Is the resistance between 12 - 15 ohms? YES -Go to step 7 NO -Go to step 11
7. Measure the resistance between EPS control unit connector D(28P) terminals No 8 and No 9 Is the resistance between 12 - 15 ohms? YES -Go to step 8 NO -Go to step 4
8. Check for continuity between EPS control unit connector D (28P) terminal No 9 and body ground Is there continuity? YES -Go to step 9 NO -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
9. Disconnect the torque sensor 3P connector from the steering gearbox
10. Check for continuity between EPS control unit connector D (28P) terminal No 9 and body ground Is there continuity? YES -Repair short to body ground in the wire between the torque sensor and the EPS control unit NO -Faulty torque sensor (short in the sensor internal circuit), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )
11. Disconnect the torque sensor 3P connector from the steering gearbox
12. On the sensor side, measure the resistance between torque sensor 3P connector terminals No 1 and No 2 Is the resistance between 12 - 15 ohms? YES -Repair open or short between the PNK and the BLU wires in the torque sensor circuit between the torque sensor and the EPS control unit NO -Faulty torque sensor (short or open in the internal circuit), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )
13. Disconnect the torque sensor 3P connector from the steering gearbox
14. On the sensor side, measure the resistance between torque sensor 3P connector terminals No 2 and No 3 Is the resistance between 12 - 15 ohms? YES -Repair open or short between the BLU and the PUR wires in the torque sensor circuit between the torque sensor and the EPS control unit NO -Faulty torque sensor (short or open in the internal circuit), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )

Scheme 76

Scheme 77

Scheme 78

Scheme 79

Scheme 80

Scheme 81

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Check for DTCs with the HDS Is DTC 51-02, 51-03, 51-06, or 51-07 indicated? YES -Go to step 6 NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
7. Disconnect EPS control unit connector D (28P)
8. Measure the resistance between EPS control unit connector D(28P) terminals No 9 and No 10 Is the resistance between 12-15 ohms? YES -Go to step 9 NO -Go to step 13
9. Measure the resistance between EPS control unit connector D (28P) terminals No 8 and No 9 Is the resistance between 12 - 15 ohms? YES -Go to step 10 NO -Go to step 15
10. Check for continuity between EPS control unit connector D (28P) terminal No 9 and body ground Is there continuity? YES -Go to step 11 NO -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
11. Disconnect the torque sensor 3P connector from the steering gearbox
12. Check for continuity between EPS control unit connector D (28P) terminal No 9 and body ground Is there continuity? YES -Repair short to body ground in the wire between the torque sensor and the EPS control unit NO -Faulty torque sensor (short in the sensor internal circuit), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )
13. Disconnect the torque sensor 3P connector from the steering gearbox
14. On the sensor side, measure the resistance between torque sensor 3P connector terminals No 1 and No 2 Is the resistance between 12-15 ohms? YES -Repair open or short between the PNK and the BLU wires in the torque sensor circuit between the torque sensor and the EPS control unit NO -Faulty torque sensor (short or open in the internal circuit), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )
15. Disconnect the torque sensor 3P connector from the steering gearbox
16. On the sensor side, measure the resistance between torque sensor 3P connector terminals No 2 and No 3 Is the resistance between 12- 15 ohms? YES -Repair open or short between the BLU and the PUR wires in the torque sensor circuit between the torque sensor and the EPS control unit NO -Faulty torque sensor (short or open in the internal circuit), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Turn the steering wheel to the right or left, and wait 10 seconds or more
6. Check for DTCs with the HDS Is DTC 61-04 indicated? YES -Go to step 7 NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
8. Disconnect EPS control unit connector B (2P) and connector C (2P)
9. Check for continuity between the following terminals of the EPS control unit connector B (2P) and connector C (2P) Is there continuity? YES -Go to step 10 NO -Go to step 13
10. Check for continuity between body ground and EPS control unit connector B (2P) terminal No 1, connector C (2P) terminal No 1, and connector C (2P) terminal No 2 individually Is there continuity? YES -Go to step 11 NO -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
11. Disconnect the EPS motor 3P connector
12. Check for continuity between body ground and EPS control unit connector B (2P) terminal No 1, connector C (2P) terminal No 1, and connector C (2P) terminal No 2 individually Is there continuity? YES -Repair short to body ground in the wire between the EPS control unit and the EPS motor NO -Short to the body ground in the EPS motor wire, or the EPS motor internal circuit, replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )
13. Disconnect the EPS motor 3P connector.
14. On the EPS motor side, check for continuity between EPS motor 3P connector terminals No 1 and No 2, No 1 and No 3, and No 2 and No 3 individually Is there continuity? YES -Repair open in the wire between the EPS control unit and the EPS motor NO -Replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) ). The fault is an open in the EPS motor wire harness or the EPS motor internal circuit

Scheme 88

Scheme 89

Scheme 90

Scheme 91

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Turn the steering wheel to the right or left, and wait 10 seconds or more.
6. Check for DTCs with the HDS Is DTC 71-01, 71-02, or 71-03 indicated? YES -Go to step 7 NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
8. Disconnect EPS control unit connector D (28P)
9. Measure the resistance between the following terminals of EPS control unit connector D (28P) Is the resistance between R1-R2 5-50 ohms, S1-S3 10-100 ohms, and S2-S4 10-100 ohms? YES -Go to step 10 NO -Go to step 13
10. Check for continuity between body ground and EPS control unit connector D(28P) terminal No 12, terminal No 13, terminal No 14, terminal No 26, terminal No 27, and terminal No 28 individually Is there continuity? YES -Go to step 11 NO -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
11. Disconnect the EPS motor angle sensor 6P connector
12. On the sensor side, check for continuity between body ground and EPS motor angle sensor 6P connector terminal No 1, terminal No 2, terminal No 3, terminal No 4, terminal No 5, and terminal No 6 individually Is there continuity? YES -Faulty EPS motor angle sensor (internal failure), or short to body ground in the wire (sensor side), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) ) NO -Repair short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit
13. Disconnect the EPS motor angle sensor 6P connector
14. On the sensor side, measure the resistance between the following terminals of the EPS motor angle sensor 6P connector Is the resistance between R1-R2 5-50 ohms, S1-S3 10-100 ohms, and S2-S4 10-100 ohms? YES -Open, or short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit NO -Faulty EPS motor angle sensor (internal failure), or short to body ground in the wire (sensor side), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )

Scheme 92

Scheme 93

Scheme 94

Scheme 95

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
4. Start the engine
5. Turn the steering wheel to the right or left, and wait 10 seconds or more
6. Check for DTCs with the HDS Is DTC 71-04 indicated? YES -Go to step 7 NO -Troubleshoot the indicated DTC If there are no DTCs, the system is OK at this time
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
8. Disconnect EPS control unit connector D (28P)
9. Measure the resistance between the EPS control unit connector D (28P) terminal No 13 and No 27 Is the resistance between 5-50 ohms? YES -Go to step 10 NO -Go to step 13
10. Check for continuity between body ground and EPS control unit connector D (28P) terminal No 13 and terminal No 27 individually Is there continuity? YES -Go to step 11 NO -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
11. Disconnect the EPS motor angle sensor 6P connector
12. On the sensor side, check for continuity between body ground and EPS motor angle sensor 6P connector terminal No 2 and terminal No 5 individually Is there continuity? YES -Faulty EPS motor angle sensor (internal failure), or short to body ground in the wire (sensor side), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) ) NO -Repair short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit
13. Disconnect the EPS motor angle sensor 6P connector
14. On the sensor side, measure the resistance between the EPS motor angle sensor 6P connector terminals No 2 and No 5 Is the resistance between 5-50 ohms? YES -Open, or short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit NO -Faulty EPS motor angle sensor (internal failure), or short to body ground in the wire (sensor side), replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-gearbox-removal-and-installation) )

EPS indicator does not come on

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and watch the EPS indicator Does the EPS indicator come on? YES -The system is OK at this time NO -Troubleshoot the gauge control module (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) )

Scheme 96

Scheme 97

Scheme 98

Scheme 99

Scheme 100

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
2. Check the No 6 (7 5 A) fuse in the driver's under-dash fuse/relay box Is the fuse blown? YES -Go to step 3 NO -Reinstall the checked fuse, then go to step 7
3. Disconnect EPS control unit connector D (28P)
4. Check for continuity between EPS control unit connector D (28P) terminal No 16 and body ground Is there continuity? YES -Repair short to body ground in the wire between the EPS control unit and the No 6 (7 5 A) fuse in the driver's under-dash fuse/relay box NO -Install a new No 6 (7 5 A) fuse in the driver's under-dash fuse/relay box, then go to step 5
5. Reconnect EPS control unit connector D (28P)
6. Start the engine, and watch the EPS indicator Does the EPS indicator come on, then go off? YES -Intermittent failure The system is OK at this time NO -Replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )
7. Disconnect EPS control unit connector D (28P)
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
9. Measure the voltage between EPS control unit connector D (28P) terminal No 16 and body ground Is there battery voltage? YES -Go to step 10 NO -Repair open in the wire between the EPS control unit and driver's under-dash fuse/relay box
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
11. Disconnect EPS control unit connector A (2P)
12. Check for continuity between EPS control unit connector A (2P) terminal No 1 and body ground Is there continuity? YES -Go to step 13 NO -Repair open in the wire between the EPS control unit and body ground (G204)
13. Disconnect the gauge control module 32P connector
14. Check for continuity between EPS control unit connector D (28P) terminal No 1 and gauge control module 32P connector terminal No 10 Is there continuity? YES -Go to step 15 NO -Repair open in the wire between the EPS control unit and the gauge control module
15. Check for continuity between EPS control unit connector D (28P) terminal No 15 and gauge control module 32P connector terminal No 9 Is there continuity? YES -Check for loose terminals in the EPS control unit connectors, and repair if necessary If no poor connections are found, replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ) NO -Repair open in the wire between the EPS control unit and the gauge control module

Steering Gearbox Removal and Installation

Special Tools Required

1. Ball joint thread protector, 12 mm 07AAF-SDAA100
2. Ball joint remover, 28 mm 07MAC-SL0A202
3. Subframe alignment pin 070AG-SJAA10S
4. Attachment arm SIL02C000033 *
5. Engine hanger balance bar VSB02C000019 *
6. Front subframe adapter VSB02C000016 *
7. Engine support hanger, A and Reds AAR-T1256 *

* These special tools are available through the Acura Tool and Equipment Program, 888-424-6857

Note these items during removal

1. Use solvent and a brush, wash any oil and dirt off the end of the steering gearbox Avoid any electrical parts Blow dry with compressed air
2. Be sure to remove the steering wheel before disconnecting the steering joint, or damage to the cable reel can occur
3. Lower the front subframe from the body, and remove the steering gearbox through the gap produced by lowering the front subframe

Scheme 101

Scheme 102

Scheme 103

Scheme 104

Scheme 105

Scheme 106

Scheme 107

Scheme 108

Scheme 109

Scheme 110

Scheme 111

Scheme 112

Scheme 113

Scheme 114

Scheme 115

Scheme 116

Scheme 117

Scheme 118

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

Scheme 124

Scheme 125

Scheme 126

Scheme 127

Scheme 128

1. Do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) )
2. Raise the vehicle on a lift, and support it with safety stands in the proper locations (see «LIFT AND SUPPORT POINTS»(/acura/tl/iv-2008-2011/remont/hoistjack/#general-information__lift-and-support-points) )
3. Remove the front wheels
4. Remove the driver's airbag (see «DRIVER'S AIRBAG REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system__drivers-airbag-replacement) ) and the steering wheel (see «STEERING WHEEL REMOVAL»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-wheel-removal) )
5. Remove the steering joint cover (A)
6. Loosen the upper steering joint bolt (A), and remove the lower steering joint bolt (B) Disconnect the steering joint (C) by sliding the steering joint into the column Tighten the upper steering joint bolt to hold the steering wheel Do not disconnect the steering joint from the column shaft (D)
7. Remove the center guide (A) (if equipped) from the top of the pinion shaft (B), and discard it The center guide is for factory assembly use only
8. Apply vinyl tape to the splines on the pinion shaft
9. Disconnect the support struts from both sides of the pivot ball (bolted to the hood) Secure the hood in a vertical position Remove the right side pivot ball and install it into the lower threaded hole, then reattach the support strut NOTE: Do not attempt to close the hood with the support strut in the vertical position, as it will damage the support strut and hood
10. Remove the left and right engine compartment covers, the strut brace cover, and the front bulkhead cover (see «FRONT BULKHEAD BRACE COVER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#exterior-trim__front-bulkhead-brace-cover-replacement) ), then remove the cowl cover (see «FRONT BULKHEAD BRACE COVER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#exterior-trim__front-bulkhead-brace-cover-replacement) )
11. Remove the strut brace (see «FRAME BRACE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/frames-subframes-crossmembers/#frame) )
12. Remove the cotter pin (A) from the tie-rod end ball joint, then remove the nut (B) on both sides
13. Disconnect the tie-rod end ball joint from the knuckle using the ball joint thread protector and the ball joint remover on both sides (see «BALL JOINT BOOT INSPECTION/REPLACEMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__ball-joint-boot-inspectionreplacement) )
14. Remove the P/S heat shield (A)
15. On the vehicle side, disconnect the EPS subharness 12P connector (A) and the EPS subharness 3P connector (B) by pushing the lock (C) and pulling up the lever (D) Wrap the connectors with vinyl tape to avoid contamination from grease or water
16. On the steering gearbox side, remove the EPS subharness 12P connector (E), the EPS subharness 3P connector (F), and the harness clip (G) from the harness bracket (H)
17. Remove the harness clips (A), then remove the heat shield bracket (B) from the steering gearbox
18. Remove the steering gearbox mounting bolts (A) and washers (B) from the steering gearbox
19. Remove the connector bracket from the front cylinder head, use the bracket bolt hole to attach the engine hanger balance bar front arm
20. Disconnect the vacuum hose (A), and remove the harness clamp (B), then remove the engine mount control solenoid valve bracket from the rear cylinder head, use the bracket bolt hole to attach the 2008 V6 attachment arm (SIL02C000033)
21. Lift and support the engine with the engine support hanger (AAR-T1256) and the engine hanger balance bar (VSB02C000019) Attach the front arm (A) to the front cylinder head with a spacer (B) and a 10 x 1 25 mm bolt (C) Remove the rear arm from the engine hanger balance bar, and install the 2008 V6 attachment arm (SIL02C000033), then attach the 2008 V6 attachment arm (D) to the rear cylinder head with the 8 x 1 25 mm bolt (E)
22. Support the engine with a jack and a wood block under the oil pan
23. Remove the rear engine mount stop (A) and the heat shield (B), then remove the rear engine mount (C)
24. Disconnect the vacuum hose (D)
25. Remove the EPS subharness holder (A), then remove the rear engine mount base (B)
26. Remove the front engine mount stop (A) and the vacuum hose bracket (B), then remove the front engine mount bolt (C)
27. Raise the vehicle on a lift
28. Remove the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(/acura/tl/iv-2008-2011/remont/exterior-body-panels/#fenderwell__front-splash-shield-replacement) )
29. Remove the front subframe stiffener (A)
30. Remove the exhaust pipe A Without SH-AWD (see «EXHAUST PIPE AND MUFFLER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system__exhaust-pipe-and-muffler-replacement) ) With SH-AWD (see «EXHAUST PIPE AND MUFFLER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system__exhaust-pipe-and-muffler-replacement) )
31. With SH-AWD Remove the propeller shaft (see «PROPELLER SHAFT REMOVAL»(/acura/tl/iv-2008-2011/remont/axle-shafts/#drivelineaxle) )
32. Remove the cotter pin (A) from the knuckle ball joint, then remove the castle nut (B)
33. Disconnect the knuckle ball joint from the lower arm using the ball joint remover (see «BALL JOINT BOOT INSPECTION/REPLACEMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__ball-joint-boot-inspectionreplacement) ) NOTE: Be careful not to damage the ball joint boot when installing the remover Do not force or hammer on the lower arm, or pry between the lower arm and the knuckle You could damage the ball joint
34. Remove the damper fork mounting nut (A) and mounting bolt (B)
35. Remove the front subframe middle mounts (A)
36. Remove the lower transmission mount nuts (A)
37. Attach the front subframe adapter (VSB02C000016) to a transmission jack, then raise the jack to the subframe Hang the belt (A) over the front of the subframe, then secure the belt by inserting the stop (B) and then tightening the wing nut (C)
38. Remove the stiffener mounting bolt (A) on both sides
39. Loosen the subframe mounting bolts (B) so they are about 20 mm (13/16 in) from the mounting surface Do not loosen the front subframe mounting bolts more than necessary
40. Remove the stiffener mounting bolt (A) and subframe mounting bolts (B) from the rear stiffeners (C)
41. Lower the jack slowly until the front subframe has dropped about 70 mm (2 3/4 in)
42. Remove the EPS subharness (A) from the steering gearbox (B) NOTE: Disconnect the EPS subharness 3P connector (C) by pushing the lock (D) and pulling down the lever (E)
43. Carefully move the steering gearbox (A) toward the driver's side until the pinion shaft clears the fender well opening on the body
44. Remove the steering gearbox (A) through the fender well opening on the driver's side
45. Remove the pinion shaft grommet (A) from the top of the torque sensor (B)

Scheme 129

Scheme 130

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

Scheme 139

Scheme 140

Scheme 141

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

Scheme 150

Scheme 151

Scheme 152

Scheme 153

1. Before installing the steering gearbox, make sure that no grease is on the mating surface of the steering gearbox and the front subframe To prevent the gearbox mounting bolts from loosening after the installation, remove any grease from the bolt holes
2. Wrap vinyl tape around the splines on the pinion shaft (A)
3. Install the pinion shaft grommet (B) Align the cutout (C) in the pinion shaft grommet with the lug portion (D) on the torque sensor The grommet must not have a gap at the mating surface of the grommet and torque sensor
4. Slide the steering gearbox (A) between the front subframe and the body from the driver's side
5. Carefully move the steering gearbox (A) toward the passenger's side until the pinion shaft clears the wheel well opening on the body
6. Install the EPS subharness (A) to the steering gearbox (B) NOTE: Pull up the lever (C) of the EPS motor 3P connector (D), then confirm the connector is fully seated
7. Loosely tighten the new right-rear subframe mounting bolt (A) and the new stiffener mounting bolt(B), insert the 15 7 mm side of the subframe alignment pin (070AG-SJAA10S) through the positioning slot (C) on the rear stiffener, through the positioning hole (D) on the subframe, and into the positioning hole (E) on the body
8. Loosely tighten the new left-rear subframe mounting bolt and the new stiffener mounting bolt with the same procedure as the right rear using the subframe alignment pin
9. Loosely tighten the new front side subframe mounting bolt (A) and the stiffener mounting bolt (B) on both sides
10. Tighten the right-rear subframe mounting bolt (A) to the specified torque
11. Tighten the left-rear subframe mounting bolt (B) to the specified torque
12. Tighten the front subframe mounting bolts (C) to the specified torque NOTE: Check all of the subframe mounting bolts, and retighten if necessary
13. Tighten the stiffener mounting bolts (D) to the specified torque NOTE: Before tightening the stiffener mounting bolts, check that the positioning holes and slot are aligned using the subframe alignment pin
14. Install the front subframe middle mounts (A) with new mounting bolts, and tighten them to the specified torque
15. Install the transmission lower mount nuts (A), and tighten them to the specified torque
16. Remove the transmission jack supporting the front subframe
17. Install the new damper fork mounting bolt (A) and new mounting nut (B), and loosely tighten the nut
18. Tighten the new castle nut (A) to the lower torque specification, then tighten it only far enough to align the slot with the ball joint pin hole Do not align the castle nut by loosening it NOTE: Insert the new cotter pin (B) into the ball joint pin hole from the front to the rear of the vehicle, and bend its end as shown Check the ball joint pin hole direction before connecting the ball joint
19. With SH-AWD Install the propeller shaft (see «PROPELLER SHAFT INSTALLATION»(/acura/tl/iv-2008-2011/remont/axle-shafts/#drivelineaxle) )
20. Install exhaust pipe A Without SH-AWD (see «EXHAUST PIPE AND MUFFLER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system__exhaust-pipe-and-muffler-replacement) ) With SH-AWD (see «EXHAUST PIPE AND MUFFLER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system__exhaust-pipe-and-muffler-replacement) )
21. Install the front subframe stiffener (A)
22. Install the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(/acura/tl/iv-2008-2011/remont/exterior-body-panels/#fenderwell__front-splash-shield-replacement) )
23. Lower the vehicle
24. Tighten the new front engine mount bolt (A), then install the front engine mount stop (B) and the vacuum hose bracket (C)
25. Support the engine with a jack and a wood block under the oil pan
26. Install the rear engine mount base (A), then install the EPS subharness (B)
27. Tighten the new rear engine mount bolt (A), then install the rear engine mount stop (B) and the heat shield (C)
28. Connect the vacuum hose (D)
29. Remove the engine support hanger and the hanger adapter
30. Install the connector bracket to the front cylinder head
31. Install the engine mount control solenoid valve bracket to the rear cylinder head, then install the harness clamp (A) and connect the vacuum hose (B)
32. Install the washers (A) and new steering gearbox mounting bolts (B) to the steering gearbox, then loosely tighten them NOTE: Make sure that the washers are in the correct position
33. Tighten the steering gearbox mounting bolts to the specified torque in the sequence shown NOTE: Check all of the steering gearbox mounting bolts, and retighten if necessary
34. Install the heat shield bracket (A) to the steering gearbox, then install the harness clips (B)
35. On the steering gearbox side, install the EPS subharness 12P connector (A), the EPS subharness 3P connector (B), and the harness clip (C) to the harness bracket (D)
36. On the vehicle side, connect the EPS subharness 12P connector (E) and the EPS subharness 3P connector (F) and pull down the lever (G), then confirm the connector is fully seated
37. Install the P/S heat shield (A) with the flange bolts, and tighten them to the specified torque
38. Install the strut brace (see «SUBFRAME REPLACEMENT»(/acura/tl/iv-2008-2011/remont/frames-subframes-crossmembers/#frame) )
39. Install the cowl cover (see «FRONT BULKHEAD BRACE COVER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#exterior-trim__front-bulkhead-brace-cover-replacement) ) and engine compartment cover (see «ENGINE COMPARTMENT COVER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#exterior-trim__engine-compartment-cover-replacement) )
40. Wipe off any grease contamination from the ball joint tapered section and threads Reconnect the tie-rod end ball joint (A) to the knuckle Install the new nut (B), and tighten it to the specified torque
41. Install a new cotter pin (C), and bend it as shown
42. Install the front wheels, then set the wheels in the straight ahead position NOTE: Before installing the wheel, clean the mating surfaces of the brake disc and the inside of the wheel
43. Remove the vinyl tape around the splines on the pinion shaft
44. Loosen the upper steering joint bolt (A) and slip the lower end of the steering joint (B) onto the pinion shaft (C) taking care to align the gap (D) within the angle
45. Align the bolt hole (A) on the steering joint with the groove (B) around the pinion shaft, then loosely install the lower steering joint bolt (C) Be sure that the joint bolt is securely in the groove in the pinion shaft
46. Pull on the steering joint to make sure that the steering joint is fully seated, then tighten the lower joint bolt to the specified torque
47. Tighten the upper steering joint bolt (D) to the specified torque
48. Install the steering joint cover (A)
49. Install the steering wheel (see «STEERING WHEEL INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__steering-wheel-installation) ) and the driver's airbag (see «DRIVER'S AIRBAG REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system__drivers-airbag-replacement) )
50. With the tires raised off the ground, check for the following symptoms by turning the steering wheel fully to the right and left several times SYMPTOM CHART Symptom Probable cause Rubbing sound coming from the lower steering column area Steering column joint is contacting the cover Grating sound from the lower steering column area, or a rough feeling during steering Poor engagement of the pinion shaft serrations Noise from around the steering wheel during steering Poor engagement of the SRS cable reel with the steering wheel, or a damaged cable reel
51. Do the battery terminal reconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) ), and do these tasks Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and check that the SRS indicator comes on for about 6 seconds and then goes off Make sure the horn and turn signal switches work properly Make sure the steering wheel switches work properly
52. After installation, do these checks

1. Start the engine, allow it to idle, and turn the steering wheel from lock-to-lock several times
2. Check that the EPS indicator does not come on
3. Check the steering wheel spoke angle If steering spoke angles to the right and left are not equal (steering wheel and rack are not centered), correct the engagement of the joint/pinion shaft serrations, then adjust the front toe by turning the tie-rod ends, if necessary
4. Do the torque sensor neutral position memorization (see «MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__memorizing-the-torque-sensor-neutral-position) )
5. With SH-AWD Do the VSA sensor neutral position memorization (see «VSA SENSOR NEUTRAL POSITION MEMORIZATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-sensor-neutral-position-memorization) )
6. Check the wheel alignment, and adjust it if necessary (see «WHEEL ALIGNMENT»(/acura/tl/iv-2008-2011/remont/wheel-alignment/#front-suspension-and-rear-suspension-inspection__wheel-alignment) )

Scheme 154

Removal

Note. Do not allow dust, dirt, or other foreign materials to enter the steering gearbox

Scheme 155

Scheme 156

Scheme 157

Scheme 158

1. Remove the boot bands (A), and discard them Remove the tie-rod clips (B), and pull the boots away from the ends of the steering gearbox
2. Hold the gearbox housing using a C-clamp (A) and wooden blocks (B) as shown Do not clamp the cylinder part of the gearbox housing in a vise
3. Unbend the lock washers (A)
4. Hold the flat surface sections (A) of the steering rack (B) with one wrench, and unscrew both rack ends (C) with another wrench Be careful not to damage the rack surface with the wrench
5. Replace B 5 Remove the lock washer (D) and the rubber stop (E)

Scheme 159

Scheme 160

Scheme 161

Scheme 162

Scheme 163

Scheme 164

Scheme 165

1. Hold the gearbox housing using a C-clamp (A) and wooden blocks (B) as shown Do not clamp the cylinder part of the gearbox housing in the vise
2. Install a new rubber stop (A) and a new lock washer (B) Align the lock washer tabs (C) with the slots (D) on the rack end (E) while holding the lock washer in place Repeat this step for the other side of the rack
3. Hold the flat surface sections of the steering rack with one wrench, and tighten both rack ends with another wrench Be careful not to damage the rack surface with the wrench
4. Bend the lock washer (A) back against the flat spots on the rack end joint housing
5. Apply multipurpose grease to the circumference of the rack end joint housing (A)
6. Apply a light coat of silicone grease to the boot grooves (B) on the rack end NOTE: Make sure not to get any silicone grease on the terminal part of the connectors and switches, especially if you have silicone grease on your hands or gloves
7. Clean off any grease or contamination from the boot installation grooves (A) around on the gearbox housing Install the boots (B) on the rack ends with the tie-rod clips (C), and fit the boot end in the installation grooves in the housing properly
8. After installing the boots, wipe the grease off the threaded section (D) of the rack end.
9. Install the new boot bands by aligning the tabs (A) with the holes (B) of the band
10. Close the ear position (A) of the boot band (B) with commercially available pincers, Oetiker 1098 or equivalent (C)
11. Slide the rack right and left to be certain that the boots are not deformed or twisted
12. Install the tie-rod end to the rack end
13. Install the steering gearbox (see «INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) )

Rack Guide Removal/Installation

Note. During removal/installation, do not allow dust, dirt, or other foreign materials to enter the steering gearbox

Scheme 166

1. Loosen the locknut (A), then remove the rack guide screw (B), the spring (C), and the rack guide (D)
2. Apply steering grease to the sliding surface and the circumference of the rack guide, and install it onto the gearbox housing Wipe the grease off the threaded section of the gearbox housing
3. Install the spring onto the gearbox housing
4. Remove the old sealant from the rack guide screw and apply new sealant (Three Bond 1215 or Loctite 5699) to the middle of the threads Loosely install the rack guide screw on the steering gearbox NOTE: If more than 5 minutes has passed after applying the sealant, remove the old sealant and residue, and reapply new sealant
5. Loosely install the locknut
6. Adjust the rack guide screw (see «RACK GUIDE ADJUSTMENT»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__rack-guide-adjustment) ) After adjusting, check that the rack moves smoothly by sliding the rack right and left

Scheme 167

1. Do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) )
2. Remove these items Passenger's dashboard undercover (see «GLOVE BOX DAMPER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard__glove-box-damper-replacement) ) Passenger's front door sill trim (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ) Passenger's kick panel (see step 3 on «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-door-areas) ) Passenger's under-dash fuse/relay box (see «PASSENGER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) )
3. Disconnect EPS control unit connector A (2P), connector B (2P), connector C (2P), and connector D (28P)
4. Remove the bolts (E) from the EPS control unit (F)
5. Remove the EPS control unit.
6. Install the EPS control unit in the reverse order of removal
7. Do the battery terminal reconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) )
8. Do the torque sensor neutral position memorization (see «MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system__memorizing-the-torque-sensor-neutral-position) )
9. After installation, start the engine, allow it to idle, and turn the steering wheel from lock-to-lock several times Check that the EPS indicator does not come on

See also:
• COMPONENT LOCATION INDEX
• BATTERY TERMINAL DISCONNECTION AND RECONNECTION
• DRIVER'S AIRBAG REPLACEMENT
• VSA SENSOR NEUTRAL POSITION MEMORIZATION
• DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• SIDE DEFOGGER VENT TRIM REMOVAL/INSTALLATION
• WHEEL ALIGNMENT
• IMMOBILIZER KEY REGISTRATION
• DLC CIRCUIT TROUBLESHOOTING
• ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING
• LIFT AND SUPPORT POINTS
• ECM/PCM UPDATE
• SUBSTITUTING THE ECM/PCM
• ECM/PCM REPLACEMENTECM/PCM REPLACEMENT
• SELF-DIAGNOSTIC FUNCTION
• FRONT BULKHEAD BRACE COVER REPLACEMENT
• FRAME BRACE REPLACEMENT
• BALL JOINT BOOT INSPECTION/REPLACEMENT
• FRONT SPLASH SHIELD REPLACEMENT
• EXHAUST PIPE AND MUFFLER REPLACEMENT
• PROPELLER SHAFT REMOVAL
• ENGINE COMPARTMENT COVER REPLACEMENT
• GLOVE BOX DAMPER REPLACEMENT
• TRIM REMOVAL/INSTALLATION - DOOR AREAS
• PASSENGER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION
• RACK GUIDE ADJUSTMENT
• STEERING LINKAGE AND GEARBOX INSPECTION
• STEERING WHEEL REMOVAL
• STEERING WHEEL INSTALLATION
• STEERING COLUMN REMOVAL AND INSTALLATION
• STEERING GEARBOX REMOVAL AND INSTALLATION
• DTC 21-01: EXCESSIVE CHANGE OF THE VEHICLE SPEED SIGNAL (REGULAR DIAGNOSIS); DTC 21-02: COMPARISON BETWEEN THE VEHICLE SPEED AND THE ENGINE SPEED SIGNAL (REGULAR DIAGNOSIS)
• DTC 22-01: ENGINE SPEED SIGNAL (INITIAL DIAGNOSIS)
• DTC 31-01; TORQUE SENSOR NEUTRAL POSITION NOT MEMORIZED (INITIAL DIAGNOSIS)
• DTC 32-01: EPS CONTROL UNIT INTERNAL CIRCUIT (CURRENT SENSOR) (INITIAL DIAGNOSIS); DTC 32-02: EPS CONTROL UNIT INTERNAL CIRCUIT (CURRENT SENSOR) (REGULAR DIAGNOSIS); DTC 35-01: EPS CONTROL UNIT INTERNAL CIRCUIT (CPU) (INITIAL DIAGNOSIS/REGULAR DIAGNOSIS); DTC 35-02: EPS CONTROL UNIT INTERNAL CIRCUIT (EEPROM) (INITIAL DIAGNOSIS); DTC 35-04: EPS CONTROL UNIT INTERNAL CIRCUIT (CPU COMMUNICATION) (REGULAR DIAGNOSIS); DTC 35-07: EPS CONTROL UNIT INTERNAL CIRCUIT (INHL/INHR PORTS) (INITIAL DIAGNOSIS/REGULAR DIAGNOSIS); DTC 36-02: EPS CONTROL UNIT INTERNAL CIRCUIT (INH OUTPUT CIRCUIT) (INITIAL DIAGNOSIS); DTC 37-01: EPS CONTROL UNIT INTERNAL CIRCUIT (STEP-UP CIRCUIT) (INITIAL DIAGNOSIS)
• DTC 34-01: POWER RELAY STUCK ON (IGNITION SWITCH IS IN LOCK (0))
• DTC 35-05: EPS CONTROL UNIT INTERNAL CIRCUIT (EPS MOTOR/EPS CPU) (INITIAL DIAGNOSIS)
• MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION