Electrical Power Steering System (Eps): Diagnosis Honda S2000 AP1

Diagnostic Trouble Code (DTC)

1. If the CPU cannot be activated, or it fails, the EPS indicator comes on, but the DTC is not memorized.
2. The memory can hold a large 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 memorized.
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 memorized in the EEPROM (non-volatile memory), therefore the memorized DTCs cannot be erased by disconnecting the battery. Do the specified procedures to clear the DTCs.

Self-diagnosis

Self-diagnosis can be classified into two 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).

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

1. Turns on the EPS indicator.
2. Memorizes the DTC.
3. Stops power assist and manual steering operation resumes.

Note. When DTC 23 (a problem with the circuit for engine speed signal) is stored, the power assist will return to normal when the control unit detects the engine speed signal and the vehicle speed is 6.2 mph (10 km/h) or above. DTCs 21, 22, and 23 the EPS indicator will go off automatically, and the system returns to normal.

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.

The connector illustrations show the female terminal connectors with a single outline and the male terminal connectors with a double outline.

1. Question the customer 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, on start up, 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 13

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. '06-09 models; 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»(ref-351945-S34342936082009122900000) ).
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 all systems DTC check, and troubleshoot any power train DTCs first.
5. Turn the ignition switch to LOCK (0).

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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. '06-09 models; 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»(ref-351945-S34342936082009122900000) ).
4. Turn the ignition switch to LOCK (0).
5. Short the SCS circuit to body ground using the HDS.
6. Turn the ignition switch to ON (II).
7. The blinking frequency indicates the DTC. DTCs are indicated by a series of long and short blinks. Add the long and short blinks together to determine the DTC. After determining the DTC, refer to the DTC troubleshooting. The system will not indicate the DTC unless these conditions are met: Set the front wheels in the straight ahead driving position. The ignition switch is turned to ON (II). The engine is stopped. The SCS circuit is shorted to body ground before the ignition switch is turned to ON (II).
8. Turn the ignition switch to LOCK (0).
9. Disconnect the HDS from the DLC.

Scheme 16

1. With the ignition switch in LOCK(O), 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. '06-09 models; 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»(ref-351945-S34342936082009122900000) ).
4. Clear the DTC(s) by following 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

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EPS CONTROL UNIT CONNECTOR A (2P) TERMINAL REFERENCE

Scheme 18

EPS CONTROL UNIT CONNECTOR B (14P) TERMINAL REFERENCE

Scheme 19

EPS CONTROL UNIT CONNECTOR C (2P) TERMINAL REFERENCE

DTC 1: Power Relay Stuck ON; DTC 2: Fail-safe Relay Stuck ON

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Turn the ignition switch to ON (II). Does the EPS indicator come on? YES -Go to step 5. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
5. Check for DTCs with the HDS. Is DTC 1 or 2 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 «GEARBOX BRACKET REMOVAL/INSTALLATION»(ref-351951-S34853274442009122900000) ). NO -Troubleshoot the indicated DTC.

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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. Does the EPS indicator come on? YES -Go to step 5. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
5. Check for DTCs with the HDS. Is DTC 3 indicated? YES -Go to step 6. NO -Troubleshoot the indicated DTC.
6. Turn the ignition switch to LOCK (0).
7. Disconnect EPS control unit connector A (2P) and the motor 2P connector.
8. Check for continuity between EPS control unit connector A (2P) terminal No. 2 and motor 2P connector terminal No. 1. Is there continuity? YES -Go to step 9. NO -Repair open in the wire between EPS control unit and the motor.
9. Check for continuity between the EPS control unit connector A (2P) terminal No. 1 and motor 2P connector terminal No. 2. Is there continuity? YES -Go to step 1 1 . NO -Repair open in the wire between the EPS control unit and the motor.
10. Check for continuity between EPS control unit connector A (2P) terminals No. 2 and No. 1. Is there continuity? YES -Repair short between the RED and GRN wires for the EPS motor circuit. NO -Short to body ground in the EPS motor wire, or EPS motor internal circuit, replace the steering gearbox (see «STEERING GEARBOX REMOVAL AND INSTALLATION»(ref-351951-S40206240362009122900000) ).

Scheme 23

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. Does the EPS indicator come on? YES -Go to step 5. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
5. Check for DTCs with the HDS. Is DTC 4 indicated? YES -Go to step 6. NO -Troubleshoot the indicated DTC.
6. Turn the ignition switch to LOCK (0).
7. Disconnect EPS control unit connector C (2P).
8. Check for continuity between EPS control unit connector C (2P) terminal No. 1 and body ground. Is there continuity? YES -Check for loose EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Repair open in the wire between the EPS control unit and the body ground (G351).

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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 right or left, and wait 10 seconds or more. Does the EPS indicator come on? YES -Go to step 6. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
6. Check for DTCs with the HDS. Is DTC 5 indicated? YES -Go to step 7. NO -Troubleshoot the indicated DTC.
7. Turn the ignition switch to LOCK (0).
8. Check the No. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box. Is the fuse blown? YES -Go to step 9. NO -Reinstall the checked fuse, then go to step 17 .
9. Disconnect EPS control unit connector C (2P).
10. Check for continuity between EPS control unit connector C (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. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box. NO -Install a new No. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box, then go to step 12 .
11. Reconnect EPS control unit connector C (2P).
12. Turn the ignition switch to ON (II).
13. Clear the DTC with the HDS.
14. Turn the ignition switch to LOCK (0).
15. Start the engine.
16. Check for DTCs with the HDS. Is DTC 5 indicated? YES -Replace the EPS control unit (see «GEARBOX BRACKET REMOVAL/INSTALLATION»(ref-351951-S34853274442009122900000) ). NO -Troubleshooting is complete.
17. Disconnect EPS control unit connector C (2P).
18. Measure the voltage between EPS control unit connector C (2P) terminal No. 2 and body ground. Is there battery voltage? YES -Go to step 1 1 . NO -Repair open in the wire between the No. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box and the EPS control unit.
19. Check for continuity between EPS control unit connector C (2P) terminal No. 1 and body ground. Is there continuity? YES -Go to step 2 2 . NO -Repair open in the wire between the EPS control unit and body ground (G351).
20. Disconnect EPS control unit connector A (2P) and the motor 2P connector.
21. Check for continuity between EPS control unit connector A (2P) terminal No. 2 and motor 2P connector terminal No. 1. Is there continuity? YES -Go to step 2 2 . NO -Repair open in the wire between EPS control unit and the motor.
22. Check for continuity between the EPS control unit connector A (2P) terminal No. 1 and motor 2P connector terminal No. 2. Is there continuity? YES -Go to step 2 2 . NO -Repair open in the wire between the EPS control unit and the motor.
23. Check for continuity between EPS control unit connector A (2P) terminal No. 1 and body ground. Is there continuity? YES -Repair short to body ground in the wire between the EPS control unit and the motor. NO -Go to step 2 2 .
24. 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 motor. NO -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck.

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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. Does the EPS indicator come on? YES -Go to step 5. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
5. Check for DTCs with the HDS. Is DTC 11 or 13 indicated? YES -Go to step 6. NO -Troubleshoot the indicated DTC.
6. Turn the ignition switch to LOCK (0).
7. Disconnect EPS control unit connector B (14P).
8. Check for continuity between EPS control unit connector B (14P) terminal No. 3 and body ground. Is there continuity? YES -Go to step 9. NO -Go to step 12 .
9. Disconnect the torque sensor 3P connector.
10. Check for continuity between the appropriate torque sensor 3P connector terminal and body ground (see table). TERMINAL CONTINUITY REFERENCE Terminal name Torque sensor terminal No. VS1 1 PVF 2 VS2 3 Is there continuity? YES -Repair short to body ground in the appropriate sensor circuit between the torque sensor and the EPS control unit. NO -Go to step 1 1 .
11. On the sensor side, check for continuity between the torque sensor 3P connector terminal No. 2 and body ground. Is there continuity? YES -Replace the torque sensor. NO -The EPS system is OK at this time. Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck.
12. Check for continuity between the appropriate EPS control unit connector B (14P) and torque sensor 3P connector terminals (see table). TERMINAL CONTINUITY REFERENCE Terminal name Torque sensor terminal No. EPS control unit terminal No. VS1 1 3 PVF 2 7 VS2 3 11 Is there continuity? YES -Go to step 1 1 . NO -Repair open in the appropriate torque sensor circuit between the EPS control unit and the torque sensor.
13. Disconnect the torque sensor connector.
14. On the sensor side, measure the resistance between torque sensor 3P connector terminals No. 1 and No. 2, and between terminals No. 2 and No. 3. Is the resistance between 12-14 ohms (at 68°F, 20°C)? YES -The EPS system is OK at this time. Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Replace the torque sensor.

DTC 22: Vehicle Speed Signal

Note. If the MIL is ON, troubleshoot the fuel and emissions systems first. When the engine is running at 2,000 rpm or above and the vehicle speed is 1 mph (1 km/h) or below for 3 minutes, the EPS indicator comes on.

Scheme 36

1. Test-drive the vehicle. Is the vehicle speedometer working correctly? YES -Go to step 2. NO -Do the speedometer system troubleshooting: '00-05 models (see «VEHICLE SPEED SIGNAL CIRCUIT TROUBLESHOOTING»(ref-351948-S23952339472009122900000) ), '06-09 models (see «'06-09 MODELS»(ref-351948-S29900112502009122900000) ).
2. Turn the ignition switch to LOCK (0).
3. Block the front wheels and release the parking brake.
4. Raise the vehicle, and support it with safety stands in the proper locations (see «SAFETY STANDS»(ref-221314-S10900723812006022400000) ).
5. Disconnect EPS control unit connector B (14P).
6. Block the right rear wheel, and slowly rotate the left rear wheel and measure the voltage between EPS control unit connector B (14P) terminal No. 2 and body ground. Does the voltage pulse 0 V and 5V? YES -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Repair open or short to body ground in the wire between the EPS control unit and body ground, or faulty speedometer.

DTC 23: Engine Speed Signal Circuit

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

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Scheme 41

1. Start the engine, and check the tachometer. Is the tachometer working correctly? YES -Go to step 2. NO -Go to step 5 .
2. Connect a commercially available spring scale to the steering wheel.
3. Pull on the scale to measure when the front wheels start to move. If the system is in good condition, the scale should read no more than 34 N (3.5 kgf, 7.7 lbf). Is the measurement within the specification? YES -The system is OK at this time. NO -Go to step 4.
4. Test-drive the vehicle with the vehicle above 6.2 mph (10 km/h). Does EPS provide power assist? YES -Go to step 5. NO -Do the troubleshooting for DTC 22.
5. Turn the ignition switch to LOCK (0).
6. Disconnect EPS control unit connector B (14P).
7. Start the engine.
8. Measure the voltage between EPS control unit connector B (14P) terminal No. 5 and body ground. Is there about 3 to 6 V? YES -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Short the SCS line with the HDS.
11. Disconnect ECM connector A (32P) ('00-05 models) or ECM connector E (31P) ('06-09 models).
12. Check for continuity between ECM connector A (32P) terminal A19 ('00-05 models) or ECM connector E (31P) terminal E25 ('06-09 models) and EPS control unit connector B (14P) connector terminal No. 5. '00-05 models '06-09 models Is there continuity? YES -Go to step 1 1 . NO -Repair the open in the wire between the EPS control unit and the ECM.
13. Disconnect gauge assembly connector C (20P) ('00-03 models) or B (30P) ('04-09 models).
14. Check for continuity between EPS control unit connector B (14P) terminal No. 5 and body ground. Is there continuity? YES -Repair the short in the wire between the EPS control unit and the ECM. NO -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck.

DTC 30: Submicrocomputer

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 10 seconds. Does the EPS indicator come on? YES -Go to step 6. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
6. Check for DTCs with the HDS. Is DTC 30 indicated? YES -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Do the appropriate troubleshooting for the code indicated.

DTC 31,32,33: Motor 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. Wait at least 10 seconds. Does the EPS indicator come on? YES -Go to step 6. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
6. Check for DTCs with the HDS. Is DTC 31, 32, or 33 indicated? YES -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Do the appropriate troubleshooting for the code indicated.

DTC 34, 35: EPS Control Unit Internal 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. Wait at least 10 seconds. Does the EPS indicator come on? YES -Go to step 6. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
6. Check for DTCs with the HDS. Is DTC 34 or 35 indicated? YES -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Do the appropriate troubleshooting for the code indicated.

Scheme 42

Scheme 43

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 right or left, and wait 10 seconds or more. Does the EPS indicator come on? YES -Go to step 6. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
6. Check for DTCs with the HDS. Is DTC 36 indicated? YES -Go to step 7. NO -Do the appropriate troubleshooting for the code indicated.
7. Turn the ignition switch to LOCK (0).
8. Check the No. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box. Is the fuse blown? YES -Go to step 9. NO -Reinstall the checked fuse, then go to step 17 .
9. Disconnect EPS control unit connector C (2P).
10. Check for continuity between EPS control unit connector C (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. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box. NO -Install a new No. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box, then go to step 12 .
11. Reconnect the EPS control unit connector B(14P).
12. Turn the ignition switch to ON (II).
13. Clear the DTC with the HDS.
14. Turn the ignition switch to LOCK (0).
15. Start the engine.
16. Check for DTCs with the HDS. Is DTC 21 indicated? YES -Replace the EPS control unit (see «GEARBOX BRACKET REMOVAL/INSTALLATION»(ref-351951-S34853274442009122900000) ). NO -Troubleshooting is complete.
17. Disconnect EPS control unit connector C (2P).
18. Measure the voltage between EPS control unit connector C (2P) terminal No. 2 and body ground. Is there battery voltage? YES -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Repair open in the wire between the No. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box and the EPS control unit.

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1. Turn the ignition switch to LOCK (0).
2. Check the No. 33 (70 A) fuse in the auxiliary under-hood 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 C (2P).
4. Check for continuity between EPS control unit connector C (2P) terminal No. 1 and body ground. Is there continuity? YES -Repair short to body ground in the wire between the EPS control unit and the No. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box. NO -Install a new No. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box, then go to step 12 .
5. Reconnect the EPS control unit connector B (14P).
6. Turn the ignition switch to ON (II).
7. Clear the DTC with the HDS.
8. Turn the ignition switch to LOCK (0).
9. Start the engine.
10. Check for DTCs with the HDS. Is DTC 21 indicated? YES -Replace the EPS control unit (see «GEARBOX BRACKET REMOVAL/INSTALLATION»(ref-351951-S34853274442009122900000) ). NO -Troubleshooting is complete.
11. Disconnect EPS control unit connector C (2P).
12. Measure the voltage between EPS control unit connector C (2P) terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 1 1 . NO -Repair open in the wire between the No. 33 (70 A) fuse in the auxiliary under-hood fuse/relay box and the EPS control unit.
13. Check for continuity between EPS control unit connector A (2P) terminal No. 2 and motor 2P connector terminal No. 1. Is there continuity? YES -Go to step 1 1 . NO -Repair open in the RED wire between the EPS control unit and the motor.
14. Check for continuity between EPS control unit connector A (2P) terminal No. 1 and motor 2P connector terminal No. 2. Is there continuity? YES -Go to step 1 1 . NO -Repair open in the GRN wire between the EPS control unit and the motor.
15. Check for continuity between EPS control unit connector A (2P) terminal No. 1 and body ground. Is there continuity? YES -Repair short to body ground in the GRN wire between the EPS control unit and the motor. NO -Go to step 1 1 .
16. 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 RED wire between the EPS control unit and the motor. NO -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck.

DTC 50 - 62; Central Processing Unit (CPU)

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS (see «HOW TO CLEAR DTCS USING THE HDS (HONDA DIAGNOSTIC SYSTEM)»(ref-351951-S33134375912009122900000) ).
3. Turn the ignition switch to LOCK (0).
4. Start the engine.
5. Wait at least 10 seconds. Does the EPS indicator come on? YES -Go to step 6. NO -Check for loose terminals or poor connections. If the connections are good, the system is OK at this time.
6. Check for DTCs with the HDS. Is DTC 50 to 62 indicated? YES -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Do the appropriate troubleshooting for the code indicated.

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1. Turn the ignition switch to ON (II), start the engine, and watch the EPS indicator. Does the EPS indicator come on? YES -If the EPS indicator comes on and goes off, it's OK. If the EPS indicator stays on or blinks, go to step 15 . NO -Go to step 2.
2. Turn the ignition switch to LOCK (0), then ON (II) again, and watch the brake system indicator. Does the brake system indicator come on? YES -Go to step 3. NO -Repair open in the indicator power source circuit: Blown No. 5 (7.5 A) fuse in the under-dash fuse/ relay box. Open in the wire between the No. 5 (7.5 A) fuse and gauge assembly. Open circuit inside the under-dash fuse/relay box.
3. Turn the ignition switch to LOCK (0).
4. Check the EPS indicator bulb in the gauge assembly. Is the bulb OK? YES -Go to step 5. NO -Replace the EPS indicator bulb.
5. Turn the ignition switch to ON (II).
6. Connect gauge assembly connector A (14P) terminal No. 14 ('00-03 models) or the gauge assembly connector B (30P) terminal No. 21 ('04-09 models) to body ground with a jumper wire. '00-03 models '04-09 models Does the EPS indicator come on? YES -Go to step 7. NO -Replace the bulb circuit board in the gauge assembly.
7. Turn the ignition switch to LOCK (0).
8. Disconnect EPS control unit connector B (14P).
9. Turn the ignition switch to ON (II).
10. Connect EPS control unit connector B (14P) terminal No. 12 and body ground with a jumper wire. Does the EPS indicator come on? YES -Go to step 1 1 . NO -Repair open in the wire between the gauge assembly and the EPS control unit.
11. Turn the ignition switch to LOCK (0).
12. Check for continuity between body ground and EPS control unit connector B (14P) terminals No. 4 and No. 6 individually. Is there continuity? YES -Go to step 1 1 . NO -Repair open in the wires between the EPS control unit and body ground (G201 and G402).
13. Turn the ignition switch to ON (II).
14. Measure the voltage between EPS control unit connector B (14P) terminal No. 1 and body ground. Is there battery voltage? YES -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Repair open in the wire between the No. 5 (7.5 A) fuse in the under-dash fuse/relay box and the EPS control unit.
15. Turn the ignition switch to LOCK (0).
16. Disconnect EPS control unit connector B (14P).
17. Disconnect the connectors from the these units. ECM connector A (32P) ('00-05 models) or ECM connector E (31P) ('06-09 models) ABS modulator-control unit ('00-05 models) or VSA modulator-control unit ('06-09 models) SRS unit
18. Check for continuity between EPS control unit connector B (14P) terminal No. 8 and body ground. Is there continuity? YES -Repair short to body ground in the SCS circuit. NO -Go to step 1 1 .
19. Connect EPS control unit connector B (14P).
20. Turn the ignition switch to ON (II).
21. Measure the voltage between data link connector (DLC) terminal No. 9 and body ground. Is there about 6 V? YES -Go to step 2 2 . NO -Repair open in the wire between the data link connector (DLC) and the EPS control unit.
22. Turn the ignition switch to LOCK (0).
23. Connect all disconnected connectors.
24. Disconnect EPS control unit connector B (14P).
25. Turn the ignition switch to ON (II), and start the engine. Does the EPS indicator go off? YES -Go to step 2 2 . NO -Repair short to body ground in the wire between the EPS indicator and the EPS control unit.
26. Inspect the bulb circuit board in the gauge assembly, power and ground to the EPS unit, and terminal fit '00-03 models; (see «CIRCUIT DIAGRAM»(ref-351948-S01632152822009122900000) ), '04-05 models; (see «CIRCUIT DIAGRAM»(ref-351948-S01632152822009122900000) ), '06-09 models; (see «CIRCUIT DIAGRAM»(ref-351948-S01632152822009122900000) ). Is it normal? YES -Check for loose terminals in the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck. NO -Replace the bulb circuit board in the gauge assembly.