Infiniti FX35, FX50 (S51). Manual — part 1927
DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL UNIT)
WT-11
< SYSTEM DESCRIPTION >
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DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL
UNIT)
Diagnosis Description
INFOID:0000000005243065
Description
During driving, the transmitter installed at each road wheel transmits the tire pressure information signal to the
receiver. The receiver receives the tire pressure signal and transmits it to the low tire pressure warning control
unit. The low tire pressure warning control unit judges whether or not the tire pressure is OK based on the tire
pressure information signal, and if it judges that the tire pressure is low, it transmits the information via CAN
communication to the BCM.
After receiving the tire pressure malfunction information via CAN communication, the BCM transmits the tire
pressure malfunction information via CAN communication to the combination meter.
After receiving the tire pressure information via CAN communication from the BCM, the combination meter illu-
minates the low tire pressure warning lamp in order to warn the driver.
Self-diagnosis procedure
1.
Initiate diagnosis mode by short-circuiting the low tire pressure warning check switch to the ground.
2.
The blinking pattern of the low tire pressure warning lamp indicates the conditions of the malfunction.
NOTE:
If the low tire pressure warning lamp is blinking repeatedly at 5 Hz, there is no malfunction occurring in the
system.
SEIA0745E
Flickering pattern
Items
Diagnostic item is detected when...
Check item
15
Tire pressure value
(Front LH)
Front LH tire pressure drops to 182 kPa (1.82 kg/cm
2
, 26.5 psi)
or less
16
Tire pressure value
(Front RH)
Front RH tire pressure drops to 182 kPa (1.82 kg/cm
2
, 26.5 psi)
or less
17
Tire pressure value
(Rear RH)
Rear RH tire pressure drops to 182 kPa (1.82 kg/cm
2
, 26.5 psi)
or less
18
Tire pressure value
(Rear LH)
Rear LH tire pressure drops to 182 kPa (1.82 kg/cm
2
, 26.5 psi)
or less
21
Transmitter no data
(Front LH)
Data from front LH transmitter cannot be received.
22
Transmitter no data
(Front RH)
Data from front RH transmitter cannot be received.
23
Transmitter no data
(Rear RH)
Data from rear RH transmitter cannot be received.
24
Transmitter no data
(Rear LH)
Data from rear LH transmitter cannot be received.
WT-12
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL UNIT)
Erase the diagnosis history.
After performing self-diagnosis by short-circuiting the Tire Pressure warning check switch to the body, turn the
ignition switch OFF.
CONSULT-III Function
INFOID:0000000005243066
FUNCTION
31
Transmitter checksum
error
(Front LH)
Checksum data from front LH transmitter is malfunctioning.
32
Transmitter checksum
error
(Front RH)
Checksum data from front RH transmitter is malfunctioning.
33
Transmitter checksum
error
(Rear RH)
Checksum data from rear RH transmitter is malfunctioning.
34
Transmitter checksum
error
(Rear LH)
Checksum data from rear LH transmitter is malfunctioning.
35
Transmitter pressure
data error (Front LH)
Air pressure data from front LH transmitter is malfunction.
36
Transmitter pressure
data error (Front RH)
Air pressure data from front RH transmitter is malfunction.
37
Transmitter pressure
data error (Rear RH)
Air pressure data from rear RH transmitter is malfunction.
38
Transmitter pressure
data error (Rear LH)
Air pressure data from rear LH transmitter is malfunction.
41
Transmitter function
code error (Front LH)
Function code data from front LH transmitter is malfunctioning.
42
Transmitter function
code error (Front RH)
Function code data from front RH transmitter is malfunctioning.
43
Transmitter function
code error (Rear RH)
Function code data from rear RH transmitter is malfunctioning.
44
Transmitter function
code error (Rear LH)
Function code data from rear LH transmitter is malfunctioning.
51
Receiver ID registration
not completed.
Receiver ID registration cannot be performed.
52
Vehicle speed signal er-
ror
Speed signal is not detected.
54
EEPROM read error
Tire Pressure Monitoring System (TPMS) malfunction in the
low tire pressure warning control unit
55
Low communication per-
formance (Front LH)
The data signal from the front LH wheel transmitter cannot be
detected due to external electromagnetic interference. (DTC
C1708 is displayed at the same time.)
56
Low communication per-
formance (Front RH)
The data signal from the front RH wheel transmitter cannot be
detected due to external electromagnetic interference. (DTC
C1709 is displayed at the same time.)
57
Low communication per-
formance (Rear RH)
The data signal from the rear RH wheel transmitter cannot be
detected due to external electromagnetic interference. (DTC
C1710 is displayed at the same time.)
58
Low communication per-
formance (Rear LH)
The data signal from the rear LH wheel transmitter cannot be
detected due to external electromagnetic interference. (DTC
C1711 is displayed at the same time.)
No flickering
Tire pressure warning
check switch
Tire pressure warning check switch circuit is open.
—
Flickering pattern
Items
Diagnostic item is detected when...
Check item
DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL UNIT)
WT-13
< SYSTEM DESCRIPTION >
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The diagnosis functions (main functions) include the following: “WORK SUPPORT”, “SELF DIAGNOSTIC
RESULT”, “DATA MONITOR”, “ACTIVE TEST”, and “ECU IDENTIFICATION”.
WORK SUPPORT
WT-7, "ID REGISTRATION PROCEDURE : Transmitter ID Registration Procedure"
.
SELF-DIAGNOSTIC RESULT
Operation procedure
Before starting self-diagnosis, start the engine and drive the vehicle at faster than 40 km/h (25 MPH) for longer
than 3 minutes.
Display Item List
Refer to
DATA MONITOR
Display Item List
ACTIVE TEST
After completing the work below, perform an active test.
• Before performing self-diagnosis, register the transmitter IDs.
• Erase the self-diagnosis result history.
Test item list
ECU IDENTIFICATION
Low tire pressure warning control unit part number can be read.
Mode
FUNCTION DESCRIPTION
Work Support
In this mode, it is possible to make quick and accurate adjustments by following the instruc-
tions on the CONSULT-III display.
Self Diagnostic Result
Receives self-diagnosis results from the low tire pressure warning control unit, and indicates
DTCs and the number of malfunctions.
Data Monitor
Receives input/output signals from the low tire pressure warning control unit and indicates
and stores them to facilitate locating the causes of malfunctions.
Active Test
Sends command to the low tire pressure warning control unit to change output signals and
check operation of output system.
ECU identification
Displays the part number of the low tire pressure warning control unit.
Monitor item (Unit)
Remarks
VHCL SPEED SE (km/h) or (MPH)
Vehicle speed
AIR PRESS FL (kPa), (kg/cm
2
) or (Psi)
Air pressure of tires
AIR PRESS FR (kPa), (kg/cm
2
) or (Psi)
AIR PRESS RR (kPa), (kg/cm
2
) or (Psi)
AIR PRESS RL (kPa), (kg/cm
2
) or (Psi)
ID REGST FL1
ID is registered: Done
ID is not registered: Yet
ID REGST FR1
ID REGST RR1
ID REGST RL1
WARNING LAMP
Low tire pressure warning lamp ON: On
Low tire pressure warning lamp OFF: Off
BUZZER
Combination meter buzzer ON: On
Combination meter buzzer OFF: Off
Test item
Condition
Details
BUZZER
Vehicle stopped
Check that the buzzer operates correctly.
WARN LAMP
The system is nor-
mal
Perform a test to check that the low tire pressure warning lamp illumi-
nates correctly.
WT-14
< DTC/CIRCUIT DIAGNOSIS >
C1704, C1705, C1706, C1707 LOW TIRE PRESSURE
DTC/CIRCUIT DIAGNOSIS
C1704, C1705, C1706, C1707 LOW TIRE PRESSURE
Description
INFOID:0000000005549601
The transmitter (1) is installed at the position of the air valve on the
road wheel (2). It measures the tire pressure and transmits the tire
pressure information by radio waves.
DTC Logic
INFOID:0000000005549602
DTC DETECTION LOGIC
DTC REPRODUCTION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT-III
1.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
2.
Check the tire pressure for all wheels and adjust to the specified value. Refer to
.
3.
Perform “AIR PRESSURE MONITOR” of self-diagnosis.
Is DTC “C1704”, “C1705”, “C1706”, or “C1707” detected?
YES
>> Perform trouble diagnosis. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005549603
1.
CHECK TIRE PRESSURE
Check the air pressure of all wheels. Refer to
.
Is the inspection result normal?
YES
>> Replace any malfunctioning transmitters.
NO
>> After adjusting the air pressure, GO TO 2.
2.
CHECK TIRE PRESSURE SIGNAL
With CONSULT-III
:Outside
JPEIC0013ZZ
DTC
Display Item
Malfunction detected condition
Possible causes
C1704
LOW PRESSURE FL
Front LH wheel pressure is or Less 182 kPa (1.86 kg/cm
2
, 26.4 psi)
or less
Low tire pressure
C1705
LOW PRESSURE FR
Front RH wheel pressure is or less 182 kPa (1.86 kg/cm
2
, 26.4 psi)
or less
C1706
LOW PRESSURE RR
Rear RH wheel pressure is or less 182 kPa (1.86 kg/cm
2
, 26.4 psi)
or less
C1707
LOW PRESSURE RL
Rear LH wheel pressure is or less 182 kPa (1.86 kg/cm
2
, 26.4 psi)
or less
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