Infiniti FX35, FX50 (S51). Manual — part 1934
POWER SUPPLY AND GROUND CIRCUIT
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POWER SUPPLY AND GROUND CIRCUIT
Description
INFOID:0000000005549639
Supply power to the low tire pressure warning control unit.
Component Function Check
INFOID:0000000005549640
1.
CHECK THE ILLUMINATION OF THE TIRE PRESSURE WARNING LAMP
Check that the low tire pressure warning lamp is turned OFF after illuminating for approximately 1 second,
when the ignition switch is turned ON.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Perform trouble diagnosis. Refer to
Diagnosis Procedure
INFOID:0000000005549641
1.
CHECK FUSE/FUSIBLE LINK
Check for fusing of the fuse and fusible link at the low tire pressure warning control unit.
• Check the 10 A fuse [No. 3 inside the fuse block (J/B)]
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
POWER SUPPLY SYSTEM CHECK
1.
Turn the ignition switch OFF.
2.
Disconnect the low tire pressure warning control unit harness connector.
3.
Turn the ignition switch ON.
CAUTION:
Never start engine.
4.
Check the continuity between the low tire pressure warning control unit harness connector and the
ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
GROUND SYSTEM INSPECTION
1.
Turn the ignition switch OFF.
2.
Check the continuity between the low tire pressure warning control unit harness connector and the
ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK TIRE PRESSURE RECEIVER POWER SUPPLY CIRCUIT
1.
Connect the low tire pressure warning control unit harness connector.
2.
Disconnect the tire pressure receiver harness connector.
3.
Check the voltage between the tire pressure receiver harness connector and ground.
Low tire pressure warning control unit
—
Voltage
Connector
Terminal
M96
15
Ground
Battery voltage
Low tire pressure warning control unit
—
Continuity
Connector
Terminal
M96
32
Ground
Existed
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POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK RECEIVER GROUND CIRCUIT
1.
Disconnect the low tire pressure warning control unit harness connector.
2.
Check the continuity between the harness connector terminals of the receiver and the low tire pressure
warning control unit.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Repair or replace error-detected parts.
Tire pressure receiver
—
Voltage
Connector
Terminal
E53 (Front LH)
1
Ground
7 - 16 V
E19 (Front RH)
B43 (Rear LH)
B251 (Rear RH)
Tire pressure receiver
Low tire pressure warning control unit
Continuity
Connector
Terminal
Connector
Terminal
E53 (Front LH)
4
M96
26
Existed
E19 (Front RH)
25
B43 (Rear LH)
24
B251 (Rear RH)
23
TIRE PRESSURE WARNING CHECK SWITCH
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TIRE PRESSURE WARNING CHECK SWITCH
Description
INFOID:0000000005549642
The following item can be checked by grounding the tire pressure warning check switch harness connector
terminal.
Component Function Check
INFOID:0000000005549643
1.
CHECK LOW TIRE PRESSURE WARNING LAMP OPERATION
Check if low tire pressure warning lamp blinks 1 second and then goes off after turning ignition switch ON.
Is inspection result normal?
YES
>> GO TO 2.
NO
>> Check low tire pressure warning lamp. Refer to
2.
CHECK TIRE PRESSURE WARNING CHECK SWITCH OPERATION
1.
Ground the tire pressure warning check switch harness connector terminal.
2.
Check the low tire pressure warning lamp blinks.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to trouble diagnosis procedure. Refer to
.
Diagnosis Procedure
INFOID:0000000005549644
1.
CHECK TIRE PRESSURE WARNING CHECK SWITCH POWER SUPPLY CIRCUIT
1.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
2.
Check the voltage between tire pressure warning check switch connector and ground.
Is the inspection result normal?
YES
>> Repair or replace low tire pressure warning control unit. Replace low tire pressure warning control
unit. Refer to
.
NO
>> GO TO 2.
2.
CHECK TIRE PRESSURE WARNING CHECK SWITCH CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect low tire pressure warning control unit harness connector
3.
Check the continuity between low tire pressure warning control unit harness connector and tire pressure
warning check switch connector.
4.
Check the continuity between low tire pressure warning control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
Tire pressure warning check switch
—
Voltage
Connector
Terminal
M23
1
Ground
7.6 - 14.6 V
Low tire pressure warning control unit
Tire pressure warning check switch
Continuity
Connector
Terminal
Connector
Terminal
Existed
M96
12
M23
1
Low tire pressure warning control unit
—
Continuity
Connector
Terminal
M96
12
Ground
Not existed
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TIRE PRESSURE WARNING CHECK SWITCH
3.
CHECK LOW TIRE PRESSURE WARNING CONTROL UNIT
Check the low tire pressure warning control unit input/output signal. Refer to
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Check low tire pressure warning control unit pin terminals for damage or loose connection with
harness connector. If any items are damaged, repair or replace damaged parts. Replace low tire
pressure warning control unit. Refer to
.
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