Nissan X-Trail 32. Instruction — part 1997
STC-38
< DTC/CIRCUIT DIAGNOSIS >
U1971 SONAR SYSTEM
U1971 SONAR SYSTEM
DTC Description
INFOID:0000000010698064
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness or connector
(CAN communication line)
• EPS control unit (steering column assembly)
• Sonar control unit
FAIL-SAFE
Around view monitor with park assist function stops (controlled by sonar).
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
DTC REPRODUCTION PROCEDURE
With CONSULT
1.
Turn the ignition switch OFF to ON.
2.
Perform “EPS/DAST 3” self-diagnosis.
Is DTC “U1971” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
.
NO-2
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010698065
1.
CHECK SONARCONTROL UNIT
1.
Turn ignition switch OFF.
2.
Disconnect sonar control unit harness connector.
3.
Check the sonar control unit pin terminals (CAN communication lines) for damage or loose connection
with harness connector.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Recheck terminals for damage or loose connection. Refer to
LAN-7, "Precautions for Harness
2.
PERFORM SELF-DIAGNOSIS (SONAR CONTROL UNIT)
With CONSULT
1.
Connect sonar control unit harness connector.
2.
Connect EPS control unit harness connector.
3.
Erase self-diagnostic results for “SONAR”.
4.
Turn the ignition switch OFF, and then wait 10 seconds and more.
5.
Turn the ignition switch ON.
6.
Perform self-diagnosis for “SONAR”.
Is any DTC detected?
DTC
Display item
(Trouble diagnosis content)
Malfunction detected condition
U1971
SONAR
(Sonar)
CAN communication signal of sonar control unit is abnormal for 2 consecutive
seconds or more.
U1971 SONAR SYSTEM
STC-39
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
YES
>> Check the DTC. Refer to
NO
>> GO TO 3.
3.
PERFORM SELF-DIAGNOSIS
With CONSULT
1.
Erase self-diagnostic results for “EPS/DAST 3”.
2.
Turn the ignition switch OFF, and then wait 10 seconds and more.
3.
Turn the ignition switch ON.
4.
Perform the self-diagnosis of all systems.
Is DTC “U1000”,“U1971” or other DTC detected?
LAN-17, "Trouble Diagnosis Flow Chart"
.
YES (“U1971”)>>Replace sonar control unit. Refer to
SN-237, "Removal and Installation"
.
YES (Other DTC)>>Check the DTC.
NO
>> INSPECTION END
STC-40
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
INFOID:0000000010688432
1.
CHECK IGNITION POWER SUPPLY FOR EPS CONTROL UNIT
1.
Turn ignition switch OFF.
2.
Disconnect EPS control unit harness connector.
3.
Check voltage between EPS control unit harness connector terminals and ground.
4.
Turn ignition switch ON.
CAUTION:
Never start the engine.
5.
Check voltage between EPS control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK IGNITION POWER SUPPLY CIRCUIT FOR EPS CONTROL UNIT
1.
Turn ignition switch OFF.
2.
Check the 10A fuse (#30).
3.
Check continuity between EPS control unit harness connector and the fuse block (J/B).
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for ignition power supply circuit.
NO
>> Repair or replace error-detected parts.
3.
CHECK BATTERY POWER SUPPLY FOR EPS CONTROL UNIT
1.
Turn ignition switch OFF.
2.
Check voltage between EPS control unit harness connector terminals and ground.
3.
Turn ignition switch ON.
CAUTION:
Never start the engine.
4.
Check voltage between EPS control unit harness connector terminals and ground.
Is the inspection result normal?
EPS control unit
—
Voltage
Connector
Terminal
M37
4
Ground
Approx. 0 V
EPS control unit
—
Voltage
Connector
Terminal
M37
4
Ground
10.5 – 16 V
EPS control unit
Fuse block (J/B)
Continuity
Connector
Terminal
Connector
Terminal
M37
4
M3
7C
Existed
EPS control unit
—
Voltage
Connector
Terminal
M38
9
Ground
10.5 – 16 V
EPS control unit
—
Voltage
Connector
Terminal
M38
9
Ground
10.5 – 16 V
POWER SUPPLY AND GROUND CIRCUIT
STC-41
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK BATTERY POWER SUPPLY CIRCUIT FOR EPS CONTROL UNIT
1.
Turn ignition switch OFF.
2.
Check the 50A fusible link (F). (Except for R9M engine models)
3.
Check the 50A fusible link (H). (Except for R9M engine models)
4.
Check the 50A fusible link (J). (For R9M engine models)
5.
Check the 50A fusible link (I). (For R9M engine models)
6.
Check the harness for open or short between EPS control unit harness connector No.9 terminal and the
50A fusible link (F). (Except for R9M engine models)
7.
Check the harness for open or short between EPS control unit harness connector No.9 terminal and the
50A fusible link (H). (Except for R9M engine models)
8.
Check the harness for open or short between EPS control unit harness connector No.9 terminal and the
50A fusible link (J). (For R9M engine models)
9.
Check the harness for open or short between EPS control unit harness connector No.9 terminal and the
50A fusible link (I). (For R9M engine models)
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
5.
CHECK EPS CONTROL UNIT GROUND CIRCUIT
Check continuity between EPS control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK TERMINAL
1.
Turn ignition switch OFF.
2.
Check EPS control unit pin terminals for damage or loose connection with harness connector.
3.
Check fuse block (J/B) pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Repair or replace error-detected parts.
EPS control unit
—
Continuity
Connector
Terminal
M38
10
Ground
Existed
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