Qashqai J11. Engine control system (K9K) — part 11
U0121 CAN COMMUNICATION
ECK-161
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
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U0121 CAN COMMUNICATION
DTC Logic
INFOID:0000000010434240
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-161, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010434241
1.
CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Check DTC with ABS actuator and electric unit (control unit). Refer to
.
Is DTC detected?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Perform trouble shooting relevant to DTC indicated.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0121
MLTIPLXD TRACTION CNTRL CONN
[Lost communication with anti-lock brake
system (ABS) control module]
• 1.DEF: INVALID SOURCE COMPUT-
ER MULTIPLEX SIGNALS
• 2.DEF: INVALID SOURCE COMPUT-
ER MULTIPLEX SIGNALS
• 3.DEF: CIRCUIT QUANTITY NOT
PLAUSIBLE
When ECM is not receiving CAN commu-
nication signal between ABS actuator
and electric unit (control unit).
ABS actuator and electric unit
(control unit)
ECK-162
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
U0298 COMMUNICATION WITH DC/DC CONVERTER CONTROL UNIT
U0298 COMMUNICATION WITH DC/DC CONVERTER CONTROL UNIT
DTC Logic
INFOID:0000000010434242
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 1 minute or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Start the engine and warm it up to normal operating temperature.
2.
Press start/stop OFF switch and check that the switch indicator is ON.
3.
Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4.
Touch “START” and operate stop/start system. (Stop the engine.)
5.
Touch “CANCEL” and restart the engine.
6.
Check DTC.
Without CONSULT
1.
Activate stop/start system. Refer to
ECK-39, "STOP/START SYSTEM : System Description"
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-162, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010434243
1.
CHECK VOLTAGE STABILIZER SIGNAL
With CONSULT
1.
Start the engine and warm it up to normal operating temperature.
2.
Press start/stop OFF switch and check that the switch indicator is ON.
3.
Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4.
Touch “START” and operate stop/start system. (engine stop.)
5.
Touch “CANCEL” and restart the engine, and then check the voltage between DC/DC converter harness
connector and ground as per the following conditions.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0298
COMMUNICATION ERROR
(LOST)
(Lost communication with DC
to DC converter control module
“A”)
During the restart, the DC/DC converter
status of the engine communication line
does not show an decrease in voltage
after an ECM transmitted voltage stabi-
lizer signal is changed from battery volt-
age to 2.0 V or less.
• Harness and connectors
(Voltage stabilizer signal line is open or cir-
cuit shorted.)
• DC/DC converter
+
–
Condition
Voltage
(Approx.)
DC/DC converter
Connector
Terminal
M22
9
Ground
While cranking with restart
2.0 V or less
Except above
Battery voltage
U0298 COMMUNICATION WITH DC/DC CONVERTER CONTROL UNIT
ECK-163
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
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Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK VOLTAGE STABILIZER SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect DC/DC converter harness connector and alternator harness connector .
3.
Disconnect ECM harness connector.
4.
Check the continuity between DC/DC converter harness connector and ECM harness connector.
5.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
3.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
ECK-402, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
4.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace ECM. Refer to
ECK-399, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
+
–
Continuity
DC/DC converter
ECM
Connector
Terminal
Connector
Terminal
M22
9
F80
51
Existed
ECK-164
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
U0299 LOST COMMUNICATION (DC/DC CONVERTER)
U0299 LOST COMMUNICATION (DC/DC CONVERTER)
DTC Logic
INFOID:0000000010434244
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 1 minute or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE-1
1.
Turn ignition switch ON and wait at least 10 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-164, "Diagnosis Procedure"
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-2
1.
Start the engine and let it idle for at least 5 minutes.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-164, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010434245
1.
CHECK ENGINE COMMUNICATION LINE
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Disconnect DC/DC converter harness connector, alternator harness connector, and active grille shutter
harness connector.
4.
Check the continuity between ECM harness connector and DC/DC converter harness connector.
5.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
Is the inspection result normal?
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0299
COMMUNICATION ERROR (LOST)
(Lost communication with DC to DC con-
verter control module “B”)
• ECM receives an abnormality signal
sent from DC/DC converter.
• ECM is not receiving LIN communica-
tion signal sent from DC/DC converter.
• DC/DC converter
• Harness and connectors
(LIN communication line)
+
−
Continuity
ECM
DC/DC converter
Connector
Terminal
Connector
Terminal
F81
141
M22
7
Existed
U0299 LOST COMMUNICATION (DC/DC CONVERTER)
ECK-165
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
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YES
>> Replace DC/DC converter. Refer to
ECK-402, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
ECK-166
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
U0315 CAN COMMUNICATION [ABS ACTUATOR AND ELECTRIC UNIT (CON-
TROL UNIT)]
U0315 CAN COMMUNICATION [ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT)]
DTC Logic
INFOID:0000000010434246
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-166, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010434247
1.
CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Check DTC with ABS actuator and electric unit (control unit). Refer to
Is DTC detected?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Perform trouble shooting relevant to DTC indicated.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0315
VEHICLE SPEED
(Software incompatibility with anti-lock
brake system control module)
• 1.DEF: INVALID SERIAL DATA RE-
CEIVED
• 2.DEF: INVALID SOURCE COMPUT-
ER MULTIPLEX SIGNALS
• 3.DEF: CIRCUIT QUANTITY NOT
PLAUSIBLE
• 4.DEF: INVALID SOURCE COMPUT-
ER MULTIPLEX SIGNALS
ECM receives invalid signal of vehicle
speed sent from ABS actuator and elec-
tric unit (control unit).
ABS actuator and electric unit
(control unit)
U0415 CAN COMMUNICATION
ECK-167
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
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U0415 CAN COMMUNICATION
DTC Logic
INFOID:0000000010289717
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DIAGNOSIS PROCEDURE
NOTE:
DTC U0415 can not duplicate.
>> Proceed to
ECK-167, "Diagnosis Procedure"
Diagnosis Procedure
INFOID:0000000010289718
1.
CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Check DTC with ABS actuator and electric unit (control unit). Refer to
.
Is DTC detected?
YES
>> Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
NO
>> Perform trouble shooting relevant to DTC indicated.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
U0415
MLTIPLXD TRACTION CNTRL CONN
[Invalid data received from anti-lock
brake system (ABS) control module]
• 1.DEF: IMPLAUSIBLE SIGNAL
• 2.DEF: INVALID SOURCE COMPUT-
ER MULTIPLEX SIGNALS
ECM receives invalid data sent from ABS
actuator and electric unit (control unit).
ABS actuator and electric unit
(control unit)
ECK-168
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
B1900 DC/DC CONVERTER
B1900 DC/DC CONVERTER
DTC Logic
INFOID:0000000010289730
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 10 seconds or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE-1
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-168, "Diagnosis Procedure"
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
1.
Start the engine and warm it up to normal operating temperature.
2.
Press start/stop OFF switch and check that the switch indicator is ON.
3.
Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4.
Touch “START” and operate stop/start system. (engine stop.)
5.
Touch “CANCEL” and restart the engine.
6.
Check DTC.
Without CONSULT
1.
Activate stop/start system. Refer to
ECK-39, "STOP/START SYSTEM : System Description"
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-168, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010289731
1.
CHECK FUSIBLE LINK
1.
Turn ignition switch OFF.
2.
Check that the following fusible link is not fusing.
Is the fusible link fusing?
YES
>> Replace the fusible link after repairing the applicable circuit.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1900
DC/DC CONVERTER
(DC/DC converter)
DC/DC converter detects power supply
input 1 is 5.0 V or less and difference
between power supply input 1 and pow-
er supply input 2 is 4.0 V or more for 3
seconds.
• Harness and connectors
(DC/DC converter power supply input 1 cir-
cuit is open or shorted.)
• DC/DC converter
Location
Fusible link
Capacity
Fusible link holder
O
30 A
B1900 DC/DC CONVERTER
ECK-169
< DTC/CIRCUIT DIAGNOSIS >
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NO
>> GO TO 2.
2.
CHECK DC/DC CONVERTER POWER SUPPLY INPUT 1
1.
Disconnect DC/DC converter harness connector.
2.
Check the voltage between DC/DC converter harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK DC/DC CONVERTER POWER SUPPLY INPUT 1 CIRCUIT
1.
Disconnect battery negative terminal.
2.
Check the continuity between DC/DC converter harness connector and fusible link.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
4.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
ECK-402, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
+
−
Voltage
DC/DC converter
Connector
Terminal
M23
1
Ground
Battery voltage
+
−
Continuity
DC/DC converter
Fusible link
Connector
Terminal
M23
1
O
Existed
ECK-170
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
B1901 DC/DC CONVERTER
B1901 DC/DC CONVERTER
DTC Logic
INFOID:0000000010289732
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 10 seconds or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE-1
1.
Turn ignition switch ON and wait at least 3 seconds.
2.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-170, "Diagnosis Procedure"
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
1.
Start the engine and warm it up to normal operating temperature.
2.
Press start/stop OFF switch and check that the switch indicator is ON.
3.
Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4.
Touch “START” and operate stop/start system. (engine stop.)
5.
Touch “CANCEL” and restart the engine.
6.
Check DTC.
Without CONSULT
1.
Activate stop/start system. Refer to
ECK-39, "STOP/START SYSTEM : System Description"
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-170, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010289733
1.
CHECK FUSIBLE LINK
1.
Turn ignition switch OFF.
2.
Check that the following fusible link is not fusing.
Is the fusible link fusing?
YES
>> Replace the fusible link after repairing the applicable circuit.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1901
DC/DC CONVERTER
(DC/DC converter)
DC/DC converter detects power supply
input 2 is 5.0 V or less and difference
between power supply input 2 and
power supply input 1 is 4.0 V or more
for 3 seconds.
• Harness and connectors
(DC/DC converter power supply input 2 cir-
cuit is open or shorted.)
• DC/DC converter
Location
Fusible link
Capacity
Fusible link holder
N
30 A
B1901 DC/DC CONVERTER
ECK-171
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
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NO
>> GO TO 2.
2.
CHECK DC/DC CONVERTER POWER SUPPLY INPUT 2
1.
Disconnect DC/DC converter harness connector.
2.
Check the voltage between DC/DC converter harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK DC/DC CONVERTER POWER SUPPLY INPUT 2 CIRCUIT
1.
Disconnect battery negative terminal.
2.
Check the continuity between DC/DC converter harness connector and fusible link.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
4.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
ECK-402, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
+
−
Voltage
DC/DC converter
Connector
Terminal
M23
3
Ground
Battery voltage
+
−
Continuity
DC/DC converter
Fusible link
Connector
Terminal
M23
3
N
Existed
ECK-172
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
B1902 DC/DC CONVERTER
B1902 DC/DC CONVERTER
DTC Logic
INFOID:0000000010289734
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 10 seconds or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Start the engine and warm it up to normal operating temperature.
2.
Press start/stop OFF switch and check that the switch indicator is ON.
3.
Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4.
Touch “START” and operate stop/start system. (Stop the engine.)
5.
Touch “CANCEL” and restart the engine.
6.
Check DTC.
Without CONSULT
1.
Activate stop/start system. Refer to
ECK-39, "STOP/START SYSTEM : System Description"
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-172, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010289735
1.
CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 1
1.
Turn ignition switch ON.
2.
Check the voltage between fuse and ground.
PG-56, "Wiring Diagram - IGNITION POWER SUPPLY -"
Is the inspection result normal?
YES
>> GO TO 2.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1902
DC/DC CONVERTER
(DC/DC converter)
DC/DC converter detects power supply
output 1 is 5.0 V or less when restart
the engine.
• Harness and connectors
(DC/DC converter power supply output 1
circuit is open or shorted.)
• DC/DC converter
• Components power-supplied from DC/DC
output 1
+
–
Voltage
Fuse No.
71
Ground
Battery voltage
72
73
74
B1902 DC/DC CONVERTER
ECK-173
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
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NO
>> GO TO 3.
2.
CHECK IGNITION POWER SUPPLY CIRCUIT
Check the following units power supply circuit.
• Combination meter
• Steering angle sensor
• Ignition power supply fuse No. 73 circuit
• Ignition power supply fuse No. 74 circuit
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
3.
CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 1 CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect battery negative terminal.
3.
Disconnect DC/DC converter harness connector.
4.
Check the continuity between DC/DC converter and Ignition relay.
PG-56, "Wiring Diagram - IGNITION POWER SUPPLY -"
5.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
ECK-402, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
+
–
Continuity
DC/DC converter
Connector
Terminal
M23
4
Ignition relay
Existed
ECK-174
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
B1903 DC/DC CONVERTER
B1903 DC/DC CONVERTER
DTC Logic
INFOID:0000000010289736
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 10 seconds or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Start the engine and warm it up to normal operating temperature.
2.
Press start/stop OFF switch and check that the switch indicator is ON.
3.
Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4.
Touch “START” and operate stop/start system. (Stop the engine.)
5.
Touch “CANCEL” and restart the engine.
6.
Check DTC.
Without CONSULT
1.
Activate stop/start system. Refer to
ECK-39, "STOP/START SYSTEM : System Description"
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-174, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010289737
1.
CHECK FUSE-1
Check that the following fuse is not fusing.
PG-11, "Wiring Diagram - BATTERY POWER SUPPLY -"
.
Is the fuse fusing?
YES
>> Replace the fuse after repairing the applicable circuit.
NO
>> GO TO 2.
2.
CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 2 (BATTERY)
1.
Turn ignition switch OFF.
2.
Check the voltage between fuse and ground.
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1903
DC/DC CONVERTER
(DC/DC converter)
DC/DC converter detects power supply
output 2 is 5.0 V or less when restart
the engine.
• Harness and connectors
(DC/DC converter power supply output 2
circuit is open or shorted.)
• DC/DC converter
• Components power-supplied from DC/DC
output 2
Fuse No.
Capacity
#80
20 A
B1903 DC/DC CONVERTER
ECK-175
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
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PG-11, "Wiring Diagram - BATTERY POWER SUPPLY -"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Perform trouble diagnosis for battery power supply circuit.
3.
CHECK FUSE-2
Check that the following fuse is not fusing.
PG-11, "Wiring Diagram - BATTERY POWER SUPPLY -"
.
Is the fuse fusing?
YES
>> Replace the fuse after repairing the applicable circuit.
NO
>> GO TO 4.
4.
CHECK DC/DC CONVERTER POWER SUPPLY OUTPUT 2 (ACCESSORY)
1.
Turn ignition switch ON.
2.
Check the voltage between fuse and ground.
PG-49, "Wiring Diagram - ACCESSORY POWER SUPPLY -"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Perform trouble diagnosis for accessory power supply circuit.
5.
CHECK ACCESSORY RELAY ROUTING CIRCUIT
Check ignition relay routing circuit.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK INTERMITTENT INCIDENT
Perform intermittent incident. Refer to
GI-41, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace DC/DC converter. Refer to
ECH-314, "Removal and Installation"
NO
>> Repair or replace error-detected parts.
+
−
Voltage
Fuse No.
#80
Ground
Battery voltage
Fuse No.
Capacity
#76
10 A
#77
10 A
+
–
Voltage
Fuse No.
76
Ground
Battery voltage
77
ECK-176
< DTC/CIRCUIT DIAGNOSIS >
[K9K]
B1904 DC/DC CONVERTER
B1904 DC/DC CONVERTER
DTC Logic
INFOID:0000000010289738
DTC DETECTION LOGIC
NOTE:
If DTC B1904 is displayed with DTC B1900 or B1901, perform the trouble diagnosis for DTC B1900 or B1901.
Refer to
or
1.
PRECONDITIONING
If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be
turned OFF and wait for 10 seconds or more to start this procedure.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Start the engine and warm it up to normal operating temperature.
2.
Press start/stop OFF switch and check that the switch indicator is ON.
3.
Select “AUTO STOP START” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
4.
Touch “START” and operate stop/start system. (Stop the engine.)
5.
Touch “CANCEL” and restart the engine.
6.
Check DTC.
Without CONSULT
1.
Activate stop/start system. Refer to
ECK-39, "STOP/START SYSTEM : System Description"
CAUTION:
Always drive vehicle at a safe speed.
2.
Restart the engine.
3.
Check DTC.
Is DTC detected?
YES
>> Proceed to
ECK-176, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010289739
1.
INSPECTION START
1.
Turn ignition switch ON.
2.
Erase DTC.
3.
Perform DTC Confirmation Procedure. Refer to
.
4.
Check DTC.
Is the DTC B1904 displayed again?
YES
>> Replace DC/DC converter. Refer to
ECK-402, "Removal and Installation"
.
NO
>> INSPECTION END
DTC
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
B1904
DC/DC CONVERTER
(DC/DC converter)
DC/DC converter function is malfunc-
tioning.
DC/DC converter
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