Electronic Power Steering (eps) System (4-cyl) Acura TSX II

Component Location Index

EPS Components

Scheme 134

EPS Indicator

Under normal conditions, the EPS indicator (A) comes on when the ignition switch is turned to ON (II), 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 135

When the EPS indicator comes on, the control unit stores the DTC. In this case, the control unit may 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), 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 speed 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 no EPS DTC is 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).
3. Steering diagnosis: Done during regular diagnosis while turning the steering wheel.

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

1. Turns on the EPS indicator.
2. Stores the DTC.
3. Stops or restricts 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) 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 steering gearbox, the torque sensor, 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.

How to Use the HDS (Honda Diagnostic System)

Note. Make sure the battery is in good condition and fully charged.

Scheme 136

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).
3. Make sure the HDS communicates with the vehicle and the EPS control unit If it does not, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__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 Help menu that came with the HDS.

How to Retrieve DTCs

1. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the EPS control unit. If it does not, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__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. Do the all systems DTC check, and troubleshoot any powertrain DTCs first.
5. Turn the ignition switch to LOCK (0).

How to Clear DTCs

1. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the EPS control unit. If it does not, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dlc-circuit-troubleshooting) ).
4. Clear the DTC(s) by following the screen prompts on the HDS.
5. Turn the ignition switch to LOCK (0).

Memorizing the Torque Sensor Neutral Position

The torque sensor neutral position must be memorized whenever the steering gearbox, the torque sensor, 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 137

1. With the ignition switch in LOCK (0), 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).
3. Make sure the HDS communicates with the vehicle and the EPS control unit. If it does not, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__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 HDS Help menu for specific instructions.
5. Turn the ignition switch to LOCK (0).

DTC Troubleshooting Index

DTC TROUBLESHOOTING INDEX

Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING INDEX

Scheme 138

CONNECTOR TERMINALS REFERENCE CHART

Scheme 139

EPS Control Unit Inputs and Outputs for Connector B (2P) (Connector Disconnected)

CONNECTOR TERMINALS REFERENCE CHART

Scheme 140

EPS Control Unit Inputs and Outputs for Connector C (2P) (Connector Disconnected)

CONNECTOR TERMINALS REFERENCE CHART

Scheme 141

CONNECTOR TERMINALS REFERENCE CHART

System Outline

The Acura TSX 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 driving)
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 ECM/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 142

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 143

EPS Control Unit Operation

The EPS control unit controls the EPS motor by these signals

1. Vehicle speed signal (from ECM/PCM)
2. Engine speed signal (from ECM/PCM)
3. EPS motor angle sensor signal
4. Torque sensor signal

At idle or low vehicle speeds, the EPS control unit sends a signal to the ECM/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 module.

Scheme 144

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 the 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 brushless 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.

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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).
8. Disconnect EPS control unit connector D (28P).
9. Turn the ignition switch to ON (II).
10. Wait at least 60 seconds.
11. Measure the voltage between EPS control unit connector D (28P) terminal No. 16 and body ground. EPS CONTROL UNIT CONNECTOR D (28P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -lf 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/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl__battery-test) ), and troubleshoot the alternator regulator circuit (see «ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/charging-system/#charging-system-4-cyl__alternator-and-regulator-circuit-troubleshooting) ).

Scheme 150

Scheme 151

1. Turn the ignition switch to ON (II).
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).
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. EPS CONTROL UNIT CONNECTOR A (2P) Is there continuity? YES -Repair a 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).
9. Clear the DTC with the HDS.
10. Turn the ignition switch to LOCK (0).
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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). 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. EPS CONTROL UNIT CONNECTOR A (2P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -Repair an 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; DTC 21-02: Comparison between the Vehicle Speed and the Engine Speed Signal

Note. If the MIL indicator 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 system.

Scheme 152

Scheme 153

1. Turn the ignition switch to LOCK (0).
2. Raise and support the vehicle (see «LIFT AND SUPPORT POINTS»(/acura/tsx/ii-2008-2014/remont/oem-general-information/#general-information-4-cyl__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 4th gear (M/T), or D position (A/T).
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 fuel and emissions systems (M/T) or A/T system (A/T) with the HDS. Is DTC P0720 (M/T), P0721 (A/T), P0722 (A/T), or P0723 (A/T) 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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 1 and recheck. If the ECM/PCM was updated and DTCs are not indicated, troubleshooting is complete. If the ECM/PCM was substituted and DTCs are not indicated, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ).
10. Turn the ignition switch to LOCK (0).
11. Short the SCS line with the HDS.
12. Disconnect EPS control unit connector D (28P) and ECM/PCM connector A (49P).
13. Check for continuity between EPS control unit connector D (28P) terminal No. 1 and ECM/PCM connector A (49P) terminal No. 3. ECM/PCM CONNECTOR A (49P) Terminal side of female terminals Is there continuity? YES -Go to step 14. NO -Repair an open in the wire between the EPS control unit and the ECM/PCM.
14. Check for continuity between EPS control unit connector D (28P) terminal No. 15 and ECM/PCM connector A (49P) terminal No. 4. Is there continuity? YES -Replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -Repair an open in the wire between the EPS control unit and the ECM/PCM.

DTC 22-01: Engine Speed Signal

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

Scheme 154

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Scheme 156

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).
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. EPS CONTROL UNIT CONNECTOR D (28P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -Go to step 7.
7. Turn the ignition switch to LOCK (0).
8. Short the SCS line with the HDS.
9. Disconnect ECM/PCM connector A (49P).
10. Check for continuity between EPS control unit connector D (28P) terminal No. 3 and body ground. EPS CONTROL UNIT CONNECTOR D (28P) Is there continuity? YES -Repair a short to body ground in the wire between the EPS control unit and the ECM/PCM. NO -Go to step 11.
11. Check for continuity between EPS control unit connector D (28P) terminal No. 3 and the ECM/PCM connector A (49P) terminal No. 29. Is there continuity? YES -Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 1 and recheck. If the ECM/PCM was updated and DTCs are not indicated, troubleshooting is complete. If the ECM/PCM was substituted and DTCs are not indicated, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). NO -Repair an open in the wire between the EPS control unit and the ECM/PCM.

DTC 31-01: Torque Sensor Neutral Position Not Written

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Do the memorizing of the torque sensor neutral position (see «MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__memorizing-the-torque-sensor-neutral-position) ).
5. Turn the ignition switch to ON (II).
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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -The system is OK at this time.

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). 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)

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time.

Scheme 157

Scheme 158

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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).
8. Disconnect EPS control unit connector B (2P) and connector C (2P).
9. Check for continuity between following terminals of EPS control unit connector B (2P) and connector C <2P). EPS CONTROL UNIT EPS CONTROL UNIT CONNECTOR B (2P) CONNECTOR C (2P) No. 1 No. 1 No. 1 No. 2 No. 1 No. 2 Is there continuity? YES -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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -Go to step 10.
10. Disconnect the EPS motor 3P connector.
11. 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. EPS MOTOR 3P CONNECTOR Is there continuity? YES -Repair an 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ).

Scheme 159

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Scheme 162

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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).
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. EPS CONTROL UNIT CONNECTOR B (2P) EPS CONTROL UNIT CONNECTOR C (2P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
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. EPS CONTROL UNIT CONNECTOR B (2P) EPS CONTROL UNIT CONNECTOR C (2P) Is there continuity? YES -Repair a short to body ground in the wire between the EPS control unit and the EPS motor. NO -Replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ).

Scheme 163

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Scheme 166

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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).
7. Disconnect EPS control unit connector B (2P) and connector C (2P).
8. Turn the ignition switch to ON (II).
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. EPS CONTROL UNIT CONNECTOR B (2P) EPS CONTROL UNIT CONNECTOR C (2P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
10. Turn the ignition switch to LOCK (0).
11. Disconnect the EPS motor 3P connector.
12. Turn the ignition switch to ON (II).
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. EPS CONTROL UNIT CONNECTOR B (2P) EPS CONTROL UNIT CONNECTOR C (2P) Is there battery voltage? YES -Repair a short to power in the wire between the EPS control unit and the EPS motor. NO -Replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ).

DTC 34-01: Power Relay

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time.

Scheme 167

Scheme 168

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) again.
4. Check for DTCs with the HDS. Is DTC 34-02 indicated? YES -Go to step 5. NO -Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time.
5. Turn the ignition switch to LOCK (0).
6. Disconnect EPS control unit connector B (2P) and connector C (2P).
7. Turn the ignition switch to ON (II).
8. 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. EPS CONTROL UNIT CONNECTOR B (2P) EPS CONTROL UNIT CONNECTOR C (2P) Is there battery voltage? YES -Repair a 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).

DTC 35-05: EPS Control Unit Internal Circuit (A/D Conversion)

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -Troubleshoot the indicated DTC. If there are no DTCs, the system is OK at this time.

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1. Turn the ignition switch to ON (II).
2. Check the ADVT1 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 ADVT2 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).
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. EPS CONTROL UNIT CONNECTOR D (28P) Is the resistance between 12-15 ohms? YES -Go to step 7. NO -Go to step 1 .
7. Measure the resistance between EPS control unit ' connector D (28P) terminals No. 8 and No. 9. EPS CONTROL UNIT CONNECTOR D (28P) Is the resistance between 12-15 ohms? YES -Go to step 8. NO -Go to step 3 .
8. Check for continuity between EPS control unit connector D (28P) terminal No. 9 and body ground. EPS CONTROL UNIT CONNECTOR D (28P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
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.

EPS CONTROL UNIT CONNECTOR D (28P)

Scheme 172

Is there continuity?

YES -Repair a short to body ground in the wire between the torque sensor and the EPS control unit.

NO -Replace the torque sensor (see TORQUE SENSOR REPLACEMENT ).

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1. Disconnect the torque sensor 3P connector from the steering gearbox.
2. On the sensor side, measure the resistance between torque sensor 3P connector terminals No. 1 and No. 2. TORQUE SENSOR 3P CONNECTOR Is the resistance between 12-15 ohms? YES -Repair an open or a short between the PNK and RED wires in the torque sensor circuit between the torque sensor and the EPS control unit. NO -Replace the torque sensor (see «TORQUE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__torque-sensor-replacement) ).
3. Disconnect the torque sensor 3P connector from the steering gearbox.
4. On the sensor side, measure the resistance between torque sensor 3P connector terminals No. 2 and No. 3. TORQUE SENSOR 3P CONNECTOR Is the resistance between 12-15 ohms? YES -Repair an open or a short between the LT GRN and RED wires in the torque sensor circuit between the torque sensor and the EPS control unit. NO -Replace the torque sensor (see «TORQUE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__torque-sensor-replacement) ).

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS
3. Turn the ignition switch to LOCK (0).
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).
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. EPS CONTROL UNIT CONNECTOR D (28P) Is the resistance between 12-15? 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. EPS CONTROL UNIT CONNECTOR D (28P) Is the resistance between 12-150ohms? 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. EPS CONTROL UNIT CONNECTOR D (28P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
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. EPS CONTROL UNIT CONNECTOR D (28P) Is there continuity? YES -Repair a short to body ground in the wire between the torque sensor and the EPS control unit. NO -Replace the torque sensor (see «TORQUE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__torque-sensor-replacement) ).
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. TORQUE SENSOR 3P CONNECTOR Is the resistance between 12-15 ohms? YES -Repair an open or a short between the PNK and RED wires in the torque sensor circuit between the torque sensor and the EPS control unit. NO -Replace the torque sensor (see «TORQUE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__torque-sensor-replacement) ).
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. TORQUE SENSOR 3P CONNECTOR Is the resistance between 12-15ohms? YES -Repair an open or a short between the LT GRN and RED wires in the torque sensor circuit between the torque sensor and the EPS control unit. NO -Replace the torque sensor (see «TORQUE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__torque-sensor-replacement) ).

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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).
8. Disconnect EPS control unit connector B (2P) and connector C (2P).
9. Check for continuity between following terminals of 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. EPS CONTROL UNIT CONNECTOR B (2P) EPS CONTROL UNIT CONNECTOR C (2P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
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. EPS CONTROL UNIT CONNECTOR B (2P) EPS CONTROL UNIT CONNECTOR C (2P) Is there continuity? YES -Repair a short to body ground in the wire between the EPS control unit and the EPS motor. NO -Replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__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. EPS MOTOR 3P CONNECTOR Is there continuity? YES -Repair an open in the wire between EPS control unit and the EPS motor. NO -Replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ).

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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).
8. Disconnect EPS control unit connector D (28P).
9. Measure the resistance between following terminals of EPS control unit connector D (28P). EPS CONTROL UNIT CONNECTOR D (28P) No. 13(R1)-No. 27(R2) No. 12(S1)-No. 26(S3) No. 14(S2)-No. 28(S4) EPS CONTROL UNIT CONNECTOR D (28P) Is the resistance between R1-R2 5-50 ohms, S1-S3 10-100 ohms, andS2-S4 10-100ohms? 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. EPS CONTROL UNIT CONNECTOR D (28P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
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. EPS MOTOR ANGLE SENSOR 6P CONNECTOR YES -Replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ). NO -Repair a 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 following terminals of the EPS motor angle sensor 6P connector. EPS MOTOR ANGLE SENSOR 6P CONNECTOR No. 5(R1)-No. 27(R2) No. 4(S1)-No. 26(S3) No. 6(S2)-No. 28(S4) EPS MOTOR ANGLE SENSOR 6P CONNECTOR Is the resistance between R1-R2 5-50 ohms, S1-S3 10-100ohms, andS2-S4 10-100 ohms? YES -Repair an open or a short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit. NO -Replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ).

Scheme 191

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
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).
8. Disconnect EPS control unit connector D (28P).
9. Measure the resistance between EPS control unit connector D (28P) terminal No. 13 and No. 27. EPS CONTROL UNIT CONNECTOR D (28P) Is the resistance between 5-50ohms? 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. EPS CONTROL UNIT CONNECTOR D (28P) 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
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. EPS MOTOR ANGLE SENSOR 6P CONNECTOR Is there continuity? YES -Replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ). NO -Repair a 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 EPS motor angle sensor 6P connector terminals No. 2 and No. 5. EPS MOTOR ANGLE SENSOR 6P CONNECTOR Is the resistance between 5-50 ohms? YES -Repair an open or a short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit. NO -Replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ).

EPS indicator does not come on

1. Turn the ignition switch to ON (II), 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/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__self-diagnostic-function) ).

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Scheme 199

1. Turn the ignition switch to LOCK (0).
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 11 .
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. EPS CONTROL UNIT CONNECTOR D (28P) Is there continuity? YES -Repair a 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. Turn the ignition switch to ON (II), and watch the EPS indicator. Does the EPS indicator come on, then go off? YES -The system is OK at this time. NO -Go to step 7.
7. Disconnect EPS control unit connector D (28P).
8. Turn the ignition switch to ON (II).
9. Measure the voltage between EPS control unit connector D (28P) terminal No. 16 and body ground. EPS CONTROL UNIT CONNECTOR D (28P) Is there battery voltage? YES -Go to step 10. NO -Repair an 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).
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. EPS CONTROL UNIT CONNECTOR A (2P) Is there continuity? YES -Go to step 13. NO -Repair an open in the wire between the EPS control unit and body ground (G203).
13. Disconnect the gauge control module 32P connector and EPS control unit connector D (28P).
14. Check for continuity between EPS control unit connector D (28P) terminal No. 1 and gauge control module 32P connector terminal No. 22. Is there continuity? YES -Go to step 15. NO -Repair an 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. 21. 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -Repair an 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-SJAA1 OS
4. Engine Hanger Adapter VSB02C000015*
5. Subframe Adapter VSB02C000016*
6. Engine Support Hanger, A and Reds AAR-T1256* *Available through the Acura Tool and Equipment Program, 888-424-6857.

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

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.

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1. Do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl) ).
2. Raise and support the vehicle (see «LIFT AND SUPPORT POINTS»(/acura/tsx/ii-2008-2014/remont/oem-general-information/#general-information-4-cyl__lift-and-support-points) ).
3. Remove the front wheels.
4. Remove the drivers' airbag (see «REMOVAL»(/acura/tsx/ii-2008-2014/remont/airbag/#srs-supplemental-restraint-system-4-cyl__removal) ), and the steering wheel (see «STEERING WHEEL REMOVAL»(/acura/tsx/ii-2008-2014/remont/manual-power-steering/#steering-4-cyl__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 shaft (D). Tighten the upper steering joint bolt to hold the steering joint in place. NOTE: Do not disconnect the steering joint from the column shaft.
7. Remove the center guide (A) (if equipped) from the top of the pinion shaft (B), and discard it.
8. Wrap vinyl tape over the splines on the pinion shaft.
9. Secure the hood in the wide open position (support rod in the lower hole).
10. Remove the strut brace (see «STRUT BRACE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exterior-body-panels/#frame-4-cyl) ).
11. Remove the front grille cover (see «FRONT GRILLE COVER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exteriorinterior-trim/#exterior-trim-4-cyl__front-grille-cover-replacement) ).
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 (C) and the ball joint remover (D) on both sides (see «BALL JOINT REMOVAL»(/acura/tsx/ii-2008-2014/remont/wheel-alignment/#front-and-rear-suspension-inspection-4-cyl__ball-joint-removal) ). NOTE: Be careful not to damage the ball joint boot when installing the remover.
14. Remove the power steering heat shield (A).
15. Disconnect the EPS motor angle sensor 6P connector (A).
16. Disconnect the EPS motor 3P connector (B) by pushing the lock (C) and pulling down the lever (D). Wrap the connectors with vinyl tape to avoid contamination from grease or water.
17. Disconnect the EPS subharness 6P connector (A). Wrap the connectors with vinyl tape to avoid contamination from grease or water.
18. Remove the steering gearbox mounting bolts (A) and washers (B) from the steering gearbox.
19. Remove the ignition coil cover (A).
20. Remove the harness cover bracket bolts (A).
21. Attach the engine hanger adapter (B) to the threaded hole located on the rear side of the cylinder head.
22. Install the engine support hanger (A) to the vehicle, and attach the hook (B) to the slotted hole in the engine hanger adapter (C). Tighten the wing nut (D) by hand to lift and support the engine. NOTE: Be careful when working around the windshield. Be careful not to damage the hood opener cable when installing the engine support hanger at the front bulkhead.
23. Remove the rear engine mount (A). A/T M/T
24. A/T: Remove the upper base bracket (A) from the base bracket (B).
25. Remove the front engine mount stop (A), then remove the front engine mount bolt (B).
26. Raise the vehicle.
27. Remove the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exterior-body-panels/#fenderwell-4-cyl__front-splash-shield-replacement) )
28. Remove exhaust pipe A (see «EXHAUST PIPE AND MUFFLER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exhaust/#intake-manifold-and-exhaust-system-4-cyl__exhaust-pipe-and-muffler-replacement) ).
29. A/T: Disconnect the shift cable from the selector control lever (see step 9 on «SHIFT CABLE ADJUSTMENT»(/acura/tsx/ii-2008-2014/remont/automatic-trans/#automatic-transmission-4-cyl) ).
30. Attach the front subframe adapter (A) to the subframe (B) by hanging the belt (C) over the front of the subframe, then secure the belt with its stop (D).
31. Raise the jack and line up the slots in the front sub frame adapter arms with the bolt holes on the jack base, then securely attach them with four bolts.
32. Remove the lower transmission mount bolts (A).
33. Remove the subframe middle mount (A) on both sides.
34. Remove the stiffener mounting bolt (A) on both sides.
35. Loosen the subframe mounting bolts (B) so they are about 20 mm (0.79 in) from the mounting surface. Do not loosen the subframe mounting bolts more than necessary.
36. Remove the stiffener mounting bolts (A) and subframe mounting bolts (B) from the rear stiffeners (C).
37. Lower the jack slowly until the subframe has dropped about 70 mm (2.76 in).
38. Carefully move the steering gearbox (A) toward the driver's side until the pinion shaft clears the fenderwell opening on the body.
39. Remove the steering gearbox (A) through the fenderwell opening on the driver's side.
40. Remove the pinion shaft grommet (A) from the top of torque sensor (B).
41. Remove the EPS subharness (A) from the steering gearbox (B).

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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 EPS subharness (B) to the steering gearbox (C).
4. Install the pinion shaft grommet (A). Align the square hole (B) in the pinion shaft grommet with the lug portion (C) on the torque sensor. The grommet must not have a gap at the mating surface of the grommet and torque sensor.
5. Turn the lip (A) of the pinion shaft grommet.
6. Slide the steering gearbox (B) between the front subframe and the body from the driver's side.
7. Carefully move the steering gearbox (A) toward the passenger's side until the pinion shaft clears the wheelwell opening on the body.
8. Continue moving the steering gearbox toward the passenger's side until the steering gearbox is in position.
9. Install the sub frame rear stiffeners (A), and loosely install the new sub frame mounting bolts (B), new rear stiffener mounting bolts (C), and front stiffener mounting bolts (D).
10. Loosely tighten the subframe mounting bolt (A) in the right rear stiffener until the subframe insulator contacts the body; insert the subframe alignment pin (070AG-SJAA10S) through the positioning slot (B) on the right rear stiffener, through the positioning hole (C) on the subframe, and into the positioning hole (D) on the body.
11. Loosely tighten the left rear subframe mounting bolt with the same procedure as the right rear using the subframe alignment pin.
12. Loosely tighten the subframe mounting bolt (A) and the stiffener mounting bolt (B) on both sides to the front stiffener.
13. Tighten the subframe mounting bolts and stiffener mounting bolts to the specified torque in the sequence shown. NOTE: Tighten 1 and 2 in the same procedure as in step 10 using the subframe alignment pin. Check all of the subframe mounting bolts, and retighten if necessary. Before tightening the stiffener mounting bolts, check that the positioning holes and slot are aligned using the subframe alignment pin.
14. Install the lower transmission mount bolts (A), and tighten them to the specified torque.
15. Install the subframe middle mount (A) with new mounting bolts, and tighten them to the specified torque on both sides.
16. Remove the transmission jack supporting the subframe.
17. A/T: Connect the shift cable to the selector control lever (see step 41 on «ATF WARMER HOSE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/automatic-trans/#automatic-transmission-4-cyl) ).
18. Install the exhaust pipe A (see «EXHAUST PIPE AND MUFFLER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exhaust/#intake-manifold-and-exhaust-system-4-cyl__exhaust-pipe-and-muffler-replacement) ).
19. Install the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exterior-body-panels/#fenderwell-4-cyl__front-splash-shield-replacement) ).
20. Lower the vehicle.
21. Tighten the new front engine mount bolt (A) to the specified torque, then install the front engine mount stop (B) with new mount nuts.
22. A/T: Install the upper base bracket (A) to the base bracket (B) with a new mounting bolt (C) and mounting bolts (D), then tighten them to the specified torque.
23. Install the rear engine mount (A) with new mounting bolts, and tighten them to the specified torque. A/T F M/T
24. Remove the engine support hanger.
25. Remove the engine hanger adapter (A).
26. Install the harness cover bracket (B).
27. Install the ignition coil cover (A).
28. 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.
29. 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.
30. Connect the EPS sub harness 6P connector (A) to the steering gearbox.
31. Remove the vinyl tape, then connect the EPS motor angle sensor 6P connector (A) to the steering gearbox.
32. Connect the EPS motor 3P connector (B), then pull up the lever (C), and confirm the connector is fully seated.
33. Install the power steering heat shield (A) with the flange bolts, and tighten them to the specified torque.
34. Install the strut brace (see «STRUT BRACE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exterior-body-panels/#frame-4-cyl) ).
35. Install the front grille cover (see «FRONT GRILLE COVER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exteriorinterior-trim/#exterior-trim-4-cyl__front-grille-cover-replacement) ).
36. Reinstall the hood support rod to the upper location of the hood.
37. Wipe off any grease contamination from the ball joint tapered section and threads. Connect the tie-rod end ball joint (A) to the knuckle. Install the nut (B), and tighten it to the specified torque.
38. Install a new cotter pin (C), and bend it as shown.
39. Install the front wheels, then set the wheels in the straight ahead position. NOTE: Before installing the wheel, clean the mating surface between the brake disc and the inside of the wheel.
40. Remove the vinyl tape around the sp lines on the pinion shaft.
41. 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. NOTE: Pick up the tabs (E) of the pinion shaft grommet, and turn up the lip of the pinion shaft grommet securely in place. Make sure that light does not enter from the space between the pinion shaft grommet and the body.
42. 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.
43. 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.
44. Tighten the upper steering joint bolt (D) to the specified torque.
45. Install the steering joint cover (A).
46. Install the steering wheel (see «STEERING WHEEL INSTALLATION»(/acura/tsx/ii-2008-2014/remont/manual-power-steering/#steering-4-cyl__steering-wheel-installation) ), and the driver's airbag (see «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/airbag/#srs-supplemental-restraint-system-4-cyl__installation) ).
47. With the tires raised off the ground (vehicle on a lift), check for the following symptoms by turning the steering wheel fully to the right and left several times. SYMPTOM REFERENCE 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.
48. Do the battery terminal reconnection procedure (see «BATTERY REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl__battery-removal-and-installation) ), and check these items: Turn the ignition switch to ON (II), 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.
49. After installation, check these items: 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. 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. Do the torque sensor neutral position memorization (see «MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__memorizing-the-torque-sensor-neutral-position) ). Check the wheel alignment, and adjust it if necessary (see «WHEEL ALIGNMENT»(/acura/tsx/ii-2008-2014/remont/wheel-alignment/#front-and-rear-suspension-inspection-4-cyl__wheel-alignment) ).

Scheme 251

Note. Do not allow dust, dirt, or other foreign materials to enter the steering gearbox. Refer to the Exploded View as needed during the following procedure.

Scheme 252

Scheme 253

Scheme 254

Scheme 255

1. Remove the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ).
2. Remove the tie-rod ends from the rack end.
3. 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.
4. Hold the gearbox housing using a C-clamp (A) and wooden blocks (B) to a work bench as shown. Do not clamp the cylinder part of the gearbox housing in a vise.
5. Unbend the lock washers (A).
6. 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.
7. Remove the lock washer (D) and the rubber stop (E).

Scheme 256

Scheme 257

Scheme 258

Scheme 259

Scheme 260

Scheme 261

Scheme 262

1. Hold the gearbox housing using a C-clamp (A) and wooden blocks (B) to a work bench as shown. Do not clamp the cylinder part of the gearbox housing in a 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 (B) 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 fitting 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 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 pincers Oetiker 1098, commercially available or equivalent (C).
11. Slide the steering 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).

Torque Sensor Replacement

Note these items during replacement

1. Do not allow dust, dirt, or other foreign materials to enter the gearbox.
2. Do not try to disassemble the torque sensor coil and the torque sensor core. If the sensor core is faulty, replace the pinion shaft as an assembly.
3. If the torque sensor (pinion shaft assembly) is replaced, the EPS control unit must memorize the torque sensor neutral position (see «MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__memorizing-the-torque-sensor-neutral-position) ).

Scheme 263

1. Remove the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__steering-gearbox-removal-and-installation) ).
2. Center the steering rack within its stroke.
3. Remove the rack guide (see «TORQUE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__torque-sensor-replacement) ).
4. Remove the torque sensor coil (A).
5. Remove the snap ring (B), then remove the torque sensor core/pinion shaft (C) and O-ring (D).
6. Coat the new O-ring with grease, and carefully fit it on the gearbox housing.
7. Apply multipurpose grease to the needle bearing (E) in the gearbox housing.
8. Install the torque sensor core/pinion shaft assembly on the gearbox housing while engaging the gear teeth. Tighten the flange bolts to the specified torque.
9. Install the rack guide (see «TORQUE SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__torque-sensor-replacement) ).
10. Install the steering gearbox (see «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
11. Adjust the rack guide screw (see «RACK GUIDE ADJUSTMENT»(/acura/tsx/ii-2008-2014/remont/manual-power-steering/#steering-4-cyl__rack-guide-adjustment) ). After adjusting, check that the rack moves smoothly by sliding the rack right and left.

Rack Guide Removal/Installation

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

Scheme 264

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/tsx/ii-2008-2014/remont/manual-power-steering/#steering-4-cyl__rack-guide-adjustment) ). After adjusting, check that the rack moves smoothly by sliding the rack right and left.

Scheme 265

1. Do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl) ).
2. Remove these items: Passenger's dashboard undercover (see «PASSENGER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#dashboard-4-cyl__passengers-dashboard-undercover-removalinstallation) ). Passenger's front door sill trim (see «TRIM REMOVAL/INSTALLATION - DOOR AREAS»(/acura/tsx/ii-2008-2014/remont/exteriorinterior-trim/#interior-trim-4-cyl__trim-removalinstallation-door-areas) ). Passenger's kick panel (see step 3 on «REAR DOOR SILL AREA»(/acura/tsx/ii-2008-2014/remont/exteriorinterior-trim/#interior-trim-4-cyl__rear-door-sill-area) ). Passenger's under-dash fuse/relay box (see «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-dash-fuserelay-box-4-cyl) ). Harness clip (E) from the EPS control unit bracket.
3. Disconnect EPS control unit connector A (2P), connector B (2P), connector C (2P), and connector D (28P).
4. Remove the bolts (F) from the EPS control unit (G).
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 REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl__battery-removal-and-installation) ).
8. Do the torque sensor neutral position memorization (see «MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl__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:
• DLC CIRCUIT TROUBLESHOOTING
• BATTERY TEST
• ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING
• LIFT AND SUPPORT POINTS
• ECM/PCM UPDATE
• SUBSTITUTING THE ECM/PCM
• ECM/PCM REPLACEMENT
• SELF-DIAGNOSTIC FUNCTION
• COMPONENT LOCATION INDEX
• BATTERY TERMINAL DISCONNECTION AND RECONNECTION
• REMOVAL
• STEERING WHEEL REMOVAL
• STRUT BRACE REPLACEMENT
• FRONT GRILLE COVER REPLACEMENT
• BALL JOINT REMOVAL
• FRONT SPLASH SHIELD REPLACEMENT
• EXHAUST PIPE AND MUFFLER REPLACEMENT
• SHIFT CABLE ADJUSTMENT
• STEERING WHEEL INSTALLATION
• INSTALLATION
• BATTERY REMOVAL AND INSTALLATION
• WHEEL ALIGNMENT
• RACK GUIDE ADJUSTMENT
• PASSENGER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• TRIM REMOVAL/INSTALLATION - DOOR AREAS
• REAR DOOR SILL AREA
• INSTALLATION
• 11-01
• 21-01
• 22-01
• 31-01
• 32-01
• 32-07
• 34-01
• 35-05
• STEERING GEARBOX REMOVAL AND INSTALLATION
• MEMORIZING THE TORQUE SENSOR NEUTRAL POSITION
• TORQUE SENSOR REPLACEMENT