2009 NISSAN TIIDA engine control unit

STC
N
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3. Check continuity between EPS control unit harness connector
(A) terminal and ground.
Also check harness for short to power.
4. Connect EPS control unit harness connector.
OK or NG OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors. YES >>
INSPECTION END
NO >> Perform self-diagnosis, repair or replace damaged parts. Refer to STC-11, " CONSULT-III Func-
tion (EPS) " .
DTC C1604 TORQUE SENSOR INFOID:0000000004307299
CONSULT-III REFERENCE VALUE IN DATA MONITOR MODE Data are reference value.
*: In the front of the value, “L” is displayed at steering left and “R” is displayed at steering right.
TERMINALS AND REFERENCE VA LUES FOR EPS CONTROL UNIT
Refer to STC-10, " EPS Terminal and Reference Value " .
DIAGNOSTIC PROCEDURE EPS Control Unit Input/Output Signal Refer-
ence Value " .
Without CONSULT-III
1. Start engine.
2. Check voltage between EPS control unit harness connec tor M53 terminals 4, 5, 6, 7 and ground. Refer to
STC-10, " EPS Terminal and Reference Value " .
OK or NG OK >> GO TO 3.
NG >> GO TO 2.

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With CONSULT-III
1. Start engine.
2. Select “DATA MONITOR” mode for “EPS” with CONSULT-III.
3. Check the values of “MOTOR SIG” and “MOTOR CURRENT”. Refer to STC-9, " EPS Control Unit Input/
Output Signal Reference Value " .
OK or NG OK >> GO TO 3.
NG >> GO TO 2. OK >> GO TO 3.
NG >> EPS motor is malfunctioning. Replace steering column
assembly. Refer to PS-9, " Removal and Installation " .
EPS Control Unit Input/Output Signal Reference
Value " .
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. OK >>
INSPECTION END
NG >> GO TO 3.
DTC C1607 EEPROM INFOID:0000000004307301
DIAGNOSTIC PROCEDURE “ EEPROM [C1607] ” displayed?
YES >> Replace EPS control unit. Refer to
PS-9, " Removal and Installation " .
NO >> INSPECTION END
DTC C1608 CONTROL UNIT INFOID:0000000004307302
DIAGNOSTIC PROCEDURE

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OK >>
INSPECTION END
NG >> Perform self-diagnosis with ABS actuator and el ectric unit (control unit) and combination meter.
Refer to BRC-18, " CONSULT-III Function (ABS) " ,
DI-12, " CONSULT-III Function (METER/M&A) "
.
DTC C1610 CAN ENG RPM INFOID:0000000004307304
CONSULT-III REFERENCE VALUE IN DATA MONITOR MODE Data are reference value.
DIAGNOSTIC PROCEDURE CONSULT-III Function (ENGINE) " (MR TYPE 1),
EC-1116, " CONSULT-III F
unction (ENGINE) " (MR TYPE 2) or
EC-103, " CONSULT-III Function " (HR16DE).
Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system.
NO >> GO TO 2. EPS Control Unit Input/Output Signal Reference
Value " .
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. OK >>
INSPECTION END
NG >> Perform self-diagnosis with ECM again. Refer EC-604, " CONSULT-III Function (ENGINE) " (MR
TYPE 1), EC-1116, " CONSULT-III Function (ENGINE) " (MR TYPE 2) or
EC-103, " CONSULT-III
Function " (HR16DE).
DTC U1000 CAN COMM CIRCUIT INFOID:0000000004307305
DIAGNOSTIC PROCEDURE “ CAN COMM CIRCUIT [U1000] ” displayed?
YES >> Print out CONSULT-III screen and go to
LAN-17, " Trouble Diagnosis Flow Chart " .
NO >> INSPECTION END
Component Inspection INFOID:0000000004307306
EPS MOTOR 1. Turn ignition switch “OFF”.
2. Disconnect EPS control unit harness connector. Monitor item (Unit) Content Condition Display value
ENGINE STATUS (RUN/STOP) Engine status Engine stopped (Engine speed: Less than 400 rpm) STOP
Engine running (Engine speed: 400 rpm or more) RUN

TROUBLE DIAGNOSIS FOR SYMPTOMS
STC-21
< SERVICE INFORMATION >
[EPS] C
D E
F
H I
J
K L
M A
B STC
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TROUBLE DIAGNOSIS FOR SYMPTOMS
EPS Warning Lamp Does Not Turn ON INFOID:0000000004307307
SYMPTOM: EPS warning lamp does not turn ON when ignition switch to “ON”.
DIAGNOSTIC PROCEDURE 1.
CHECK SYSTEM FOR CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to STC-11, " CONSULT-III Function (EPS) " .
Is the “ CAN COMM CIRCUIT [U1000] ” displayed?
YES >> Perform trouble diagnosis for CAN communication line. Refer to
STC-19, " DTC U1000 CAN
COMM CIRCUIT " .
NO >> GO TO 2. 2.
CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-9, " EPS Control Unit Input/Output Signal Reference
Value " .
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 DI-19, " Removal and Installation " .
EPS Warning Lamp Does Not Turn OFF INFOID:0000000004307308
SYMPTOM: EPS warning lamp does not turn OFF for several seconds after starting the engine.
DIAGNOSTIC PROCEDURE 1.
CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to STC-11, " CONSULT-III Function (EPS) " .
Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system.
NO >> GO TO 2. 2.
CHECK EPS CONTROL UNI T POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect EPS control unit harness connector.
3. Turn ignition switch “ON”. (Do not start engine.)
4. Check voltage between EPS control unit harness connector (A) terminals and ground.
Connector Terminal VoltageM53 10 – Ground Battery voltage
M54 17 – Ground Battery voltage SGIA1626E

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Is the “ CAN COMM CIRCUIT [U1000] ” displayed?
YES >> Perform trouble diagnosis for CAN communication line. Refer to
STC-19, " DTC U1000 CAN
COMM CIRCUIT " .
NO-1 >> With ABS: GO TO 2.
NO-2 >> Without ABS: GO TO 3. CONSULT-III
Function (ABS) " .
Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system.
NO >> GO TO 4. CONSULT-III Function (TRANSMISSION) " .
Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system.
NO >> GO TO 4. CONSULT-III Function (METER/M&A) " .
Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system.
NO >> GO TO 5. CONSULT-III Function (ENGINE) " (MR TYPE 1),
EC-1116," CONSULT-III Function (ENGINE) " (MR TYPE 2) or
EC-103, " CONSULT-III Function " (HR16DE).
Is any malfunction detected by self-diagnosis? YES >> Check the malfunctioning system.
NO >> GO TO 6. DTC C1606 EPS MOTOR " .
OK or NG OK >> GO TO 7.
NG >> Repair or replace damaged parts. EPS Control Unit Input/Output Signal Reference
Value " .
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. OK >>
INSPECTION END
NG >> Check the steering wheel turning force because there may be mechanical malfunction. Refer to PS-6, " On-Vehicle Inspection and Service " .
Unbalance Steering Wheel Turning Forc e and Return Between Right and Left
INFOID:0000000004307310
SYMPTOM: