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Steering Control System: Diagnosis Nissan Versa I

Steering Control Systems 2 illustrations ~1930 words

PRECAUTIONS FOR TROUBLE DIAGNOSIS

  1. Be sure to check the procedures of the trouble diagnosis in advance. Refer to " «HOW TO PERFORM TROUBLE DIAGNOSIS»(ref-337639-S26083748432009080600000) ".
  2. Always erase memory after completing trouble diagnosis. Refer to " «HOW TO ERASE SELF-DIAGNOSTIC RESULTS»(ref-337639-S23856399422009080600000) ".
  3. Checking continuity and voltage between units, be sure to check connector terminals for disconnection, looseness, bend, or collapse. Repair or replace applicable part if any non-standard condition is detected.
  4. Be careful not to forcibly extend any connector terminal if a circuit tester is used for the check.
  5. Always confirm the general precautions. Refer to " «GENERAL PRECAUTIONS»(ref-337611-S18338125262009080600000) ".

Scheme 9

Scheme 9: INTERVIEW
Scheme 9: INTERVIEW
  1. Complaints vary depending on the person. It is important to clarify the customer's actual remarks.
  2. Ask the customer about what symptoms occur under what conditions. Use the information to reproduce the symptom of confirm by vehicle.

Scheme 10

Scheme 10: Component Parts Location
Scheme 10: Component Parts Location

How to Erase Self-Diagnostic Results

  1. Perform applicable inspection of malfunctioning item and then repair or replace.
  2. Turn ignition switch "OFF" to erase memory.
  3. Turn ignition switch "ON" and select "SELF-DIAG RESULTS" mode with CONSULT-III.
  4. Touch "ERASE" on CONSULT-III screen to erase DTC memory. CAUTION: If memory cannot be erased, perform diagnosis.

Symptom Chart

If EPS warning lamp turns ON, perform self-diagnosis. Refer to " SELF-DIAG RESULTS MODE ".

SymptomConditionCheck item
EPS warning lamp does not turn ON when ignition switch to "ON". (EPS warning lamp check)Ignition switch: ONCAN communication line
Combination meter
EPS warning lamp does not turn OFF for several seconds after starting the engineEngine runningCAN communication line
Power supply and ground for EPS control unit
Torque sensor
EPS motor
Vehicle speed signal
Engine status signal
Combination meter
STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT, WHILE DRIVINGWhile driving Steering wheel turningCAN communication line
Vehicle speed signal
Engine status signal
EPS motor
Steering wheel turning force (Mechanical malfunction)
UNBALANCE STEERING WHEEL TURNING FORCE AND RETURN BETWEEN RIGHT AND LEFT, WHILE DRIVINGWhile driving Steering wheel turningWheel alignment
Steering wheel turning force (Mechanical malfunction)
UNBALANCE STEERING WHEEL TURNING FORCE, WHILE DRIVING (TORQUE VARIATION)While driving Steering wheel turningSteering column intermediate shaft installation condition
Steering wheel turning force (Mechanical malfunction)

PROBLEM SYMPTOM CHART

DIAGNOSTIC PROCEDURE

  1. PERFORM SELF-DIAGNOSIS With CONSULT-III Turn ignition switch "ON". (Do not start engine.) Select "SELF-DIAG RESULTS" mode for "EPS" with CONSULT-III. Touch "ERASE". Turn ignition switch "OFF", and wait at least 10 seconds. Start engine. Perform the self-diagnosis again. Is the "EEPROM [C1607]" displayed? YES >> Replace EPS control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-337621-S42121218432009080600000) ". NO >> INSPECTION END
  1. PERFORM SELF-DIAGNOSIS With CONSULT-III Turn ignition switch "ON". (Do not start engine.) Select "SELF-DIAG RESULTS" mode for "EPS" with CONSULT-III. Touch "ERASE". Turn ignition switch "OFF", and wait at least 10 seconds. Start engine. Perform the self-diagnosis again. Is the "CONTROL UNIT [C1608]" displayed? YES >> Replace EPS control unit. Refer to " «REMOVAL AND INSTALLATION»(ref-337621-S42121218432009080600000) ". NO >> INSPECTION END
  1. CHECK DTC WITH COMBINATION METER Perform self-diagnosis with combination meter. Refer to " «SELF-DIAGNOSTIC RESULTS»(ref-337635-S08049332002009080600000) ". Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. NO-1 >> With ABS: GO TO 2. NO-2 >> Without ABS: GO TO 3 .
  2. CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to " «SELF-DIAGNOSIS»(ref-337617-S13174347562009080600000) ". Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. NO >> GO TO 4 .
  3. CHECK DTC WITH TRANSMISSION CONTROL MODULE (TCM) Perform self-diagnosis with TCM. Refer to " «SELF-DIAGNOSTIC RESULT MODE»(ref-337615-S23700200462009080600000) ". Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. NO >> GO TO 4.
  4. CHECK EPS CONTROL UNIT Check EPS control unit input/output signal. Refer to " «EPS CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES»(ref-337639-S38338485312009080600000) ". OK or NG OK >> GO TO 5. NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  5. CHECK DTC Perform the self-diagnosis, after driving the vehicle for a while. OK or NG OK >> INSPECTION END NG >> Perform self-diagnosis with ABS actuator and electric unit (control unit) and combination meter. Refer to " «SELF-DIAGNOSIS»(ref-337617-S13174347562009080600000) ", " «SELF-DIAGNOSTIC RESULTS»(ref-337635-S08049332002009080600000) ".
  1. CHECK DTC WITH ECM Perform self-diagnosis with ECM. Refer to " «SELF-DIAG RESULTS MODE»(ref-319464-S21873960492009062600000) ". Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. NO >> GO TO 2.
  2. CHECK EPS CONTROL UNIT Check EPS control unit input/output signal. Refer to " «EPS CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES»(ref-337639-S38338485312009080600000) ". OK or NG OK >> GO TO 3. NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  3. CHECK DTC Perform the self-diagnosis, after driving a vehicle for a while. OK or NG OK >> INSPECTION END NG >> Perform self-diagnosis with ECM again. Refer " «SELF-DIAG RESULTS MODE»(ref-319464-S21873960492009062600000) ".
  1. CHECK CAN COMMUNICATION CIRCUIT With CONSULT-III Turn ignition switch "ON" and start engine. Select "SELF-DIAG RESULTS" mode for "EPS" with CONSULT-III. Perform the self-diagnosis. Is the "CAN COMM CIRCUIT [U1000]" displayed? YES >> Print out CONSULT-III screen and go to " «CAN SYSTEM SPECIFICATION CHART»(ref-337619-S11938871012009080600000) ". NO >> INSPECTION END

SYMPTOM

EPS warning lamp does not turn ON when ignition switch to "ON".

  1. CHECK SYSTEM FOR CAN COMMUNICATION LINE Perform self-diagnosis. Refer to " «SELF-DIAG RESULTS MODE»(ref-337639-S25531247662009080600000) ". Is the "CAN COMM CIRCUIT [U1000]" displayed? YES >> Perform trouble diagnosis for CAN communication line. Refer to " «DTC U1000 CAN COMM CIRCUIT»(ref-337639-S33257913272009080600000) ". NO >> GO TO 2.
  2. CHECK EPS CONTROL UNIT Check EPS control unit input/output signal. Refer to " «EPS CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES»(ref-337639-S38338485312009080600000) ". OK or NG OK >> GO TO 3. NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  3. SYMPTOM CHECK Check again. OK or NG OK >> INSPECTION END NG >> Replace combination meter. Refer to " «REMOVAL AND INSTALLATION»(ref-337635-S38821939382009080600000) ".

EPS warning lamp does not turn OFF for several seconds after starting the engine.

  1. CHECK SELF-DIAGNOSTIC RESULTS Perform self-diagnosis. Refer to " «SELF-DIAG RESULTS MODE»(ref-337639-S25531247662009080600000) ". Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. NO >> GO TO 2.
  2. CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT Turn ignition switch "OFF". Disconnect EPS control unit harness connector. Turn ignition switch "ON". (Do not start engine.) Check voltage between EPS control unit harness connector (A) terminals and ground. TERMINALS VOLTAGE CHART Connector Terminal Voltage M53 10 - Ground Battery voltage M54 17 - Ground Battery voltage Turn ignition switch "OFF". Check voltage between EPS control unit harness connector (A) terminals and ground. TERMINALS VOLTAGE CHART Connector Terminal Voltage M53 10 - Ground Approx. 0 V M54 17 - Ground Battery voltage Connect EPS control unit harness connector. OK or NG OK >> GO TO 3. NG >> Check the following. If any items are damaged, repair or replace damaged parts. 60 A fusible link (No. m , located in the fuse and fusible link block). Refer to " «POWER SUPPLY ROUTING CIRCUIT»(ref-337618-S12320956552009080600000) ". 10 A fuse [No. 2, located in the fuse block (J/B)]. Refer to " «POWER SUPPLY ROUTING CIRCUIT»(ref-337618-S12320956552009080600000) ". Harness for short or open between battery and EPS control unit harness connector M54 terminal 17. Harness for short or open between ignition switch and EPS control unit harness connector M53 terminal 10.
  3. CHECK EPS CONTROL UNIT GROUND CIRCUIT Turn ignition switch "OFF". Disconnect EPS control unit harness connector. Check continuity between EPS control unit harness connector (A) terminal and ground. TERMINALS CONTINUITY CHART Connector Terminal Continuity M54 18 YES Also check harness for short to power. Connect EPS control unit harness connector. OK or NG OK >> GO TO 4. NG >> Repair open circuit or short to ground or short to power in harness or connectors.
  4. CHECK EPS CONTROL UNIT Check EPS control unit input/output signal. Refer to " «EPS CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES»(ref-337639-S38338485312009080600000) ". OK or NG OK >> GO TO 5. NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  5. SYMPTOM CHECK Check again. OK or NG OK >> INSPECTION END NG >> Replace combination meter. Refer to " «REMOVAL AND INSTALLATION»(ref-337635-S38821939382009080600000) ".

Steering wheel turning force is heavy or light, while driving.

  1. CHECK SYSTEM FOR CAN COMMUNICATION LINE Perform self-diagnosis. Refer to " «SELF-DIAG RESULTS MODE»(ref-337639-S25531247662009080600000) ". Is the "CAN COMM CIRCUIT [U1000]" displayed? YES >> Perform trouble diagnosis for CAN communication line. Refer to " «DTC U1000 CAN COMM CIRCUIT»(ref-337639-S33257913272009080600000) ". NO-1 >> With ABS: GO TO 2. NO-2 >> Without ABS: GO TO 3 .
  2. CHECK VEHICLE SPEED SIGNAL FROM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to " «SELF-DIAGNOSIS»(ref-337617-S13174347562009080600000) ". Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. NO >> GO TO 4 .
  3. CHECK VEHICLE SPEED SIGNAL FROM TRANSMISSION CONTROL MODULE (TCM) Perform self-diagnosis with TCM. Refer to " «SELF-DIAGNOSTIC RESULT MODE»(ref-337615-S23700200462009080600000) ". Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. NO >> GO TO 4.
  4. CHECK COMBINATION METER SIGNAL Perform self-diagnosis with combination meter. Refer to " «SELF-DIAGNOSTIC RESULTS»(ref-337635-S08049332002009080600000) ". Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. NO >> GO TO 5.
  5. CHECK ENGINE STATUS SIGNAL Perform self-diagnosis for ECM. Refer to " «SELF-DIAG RESULTS MODE»(ref-319464-S21873960492009062600000) ". Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system. NO >> GO TO 6.
  6. CHECK EPS MOTOR SYSTEM Perform trouble diagnosis for EPS motor. Refer to " «DTC C1606 EPS MOTOR»(ref-337639-S16201078302009080600000) ". OK or NG OK >> GO TO 7. NG >> Repair or replace damaged parts.
  7. CHECK EPS CONTROL UNIT Check EPS control unit input/output signal. Refer to " «EPS CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES»(ref-337639-S38338485312009080600000) ". OK or NG OK >> GO TO 8. NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  8. SYMPTOM CHECK

Check again.

OK or NG

OK >> INSPECTION END

NG >> Check the steering wheel turning force because there may be mechanical malfunction. Refer to " CHECKING STEERING WHEEL TURNING FORCE ".

Unbalance steering wheel turning force and return between right and left, while driving.

  1. CHECK EPS WARNING LAMP Confirm EPS warning lamp during engine running. Does EPS warning lamp turn OFF? YES >> GO TO 2. NO >> Go to " «EPS WARNING LAMP DOES NOT TURN OFF»(ref-337639-S14939049212009080600000) ".
  2. CHECK WHEEL ALIGNMENT Check wheel alignment. Refer to " «WHEEL ALIGNMENT INSPECTION»(ref-337640-S33898805152009080600000) ". OK or NG OK >> GO TO 3. NG >> Adjust wheel alignment. Refer to " «WHEEL ALIGNMENT INSPECTION»(ref-337640-S33898805152009080600000) "
  3. CHECK EPS CONTROL UNIT Check EPS control unit input/output signal. Refer to " «EPS CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES»(ref-337639-S38338485312009080600000) ". OK or NG OK >> GO TO 4. NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  4. SYMPTOM CHECK Check again. OK or NG OK >> INSPECTION END NG >> Check the steering wheel turning force because there may be mechanical malfunction. Refer to " «CHECKING STEERING WHEEL TURNING FORCE»(ref-337621-S30715559662009080600000) ".

Unbalance steering wheel turning force, while driving (Torque variation).

  1. CHECK EPS WARNING LAMP Confirm EPS warning lamp during engine running. Does EPS warning lamp turn OFF? YES >> GO TO 2. NO >> Go to " «EPS WARNING LAMP DOES NOT TURN OFF»(ref-337639-S14939049212009080600000) ".
  2. CHECK STEERING COLUMN INTERMEDIATE SHAFT Check the connection between intermediate shaft and the mounting part of steering column assembly and steering gear assembly. Refer to " «COMPONENT»(ref-337621-S41826725682009080600000) ". OK or NG OK >> GO TO 3. NG >> Repair or replace damaged parts.
  3. CHECK EPS CONTROL UNIT Check EPS control unit input/output signal. Refer to " «EPS CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES»(ref-337639-S38338485312009080600000) ". OK or NG OK >> GO TO 4. NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  4. SYMPTOM CHECK Check again. OK or NG OK >> INSPECTION END NG >> Check the steering wheel turning force because there may be mechanical malfunction. Refer to " «CHECKING STEERING WHEEL TURNING FORCE»(ref-337621-S30715559662009080600000) ".

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