02 sensor INFINITI QX4 2001 Factory Service Manual

MALFUNCTION CODE TABLE=NBEL0213S02In this mode, a malfunction code is indicated by the number of flashes from the automatic drive positioner
indicator lamps (indicator lamp 1, indicator lamp 2) as shown below.
SEL597W
Code
No.Detected
itemsDiagnostic procedureRefer-
ence
pageCode
No.Detected
itemsDiagnostic procedureRefer-
ence
page
1Seat
slidingPROCEDURE 2
(Sliding encoder check)
PROCEDURE 6
(Sliding motor check)EL-203
EL-2114Seat
lifting
rearPROCEDURE 5
[Lifting encoder (rear) check]
PROCEDURE 9
[Lifting motor (rear) check]EL-209
EL-214
2Seat
recliningPROCEDURE 3
(Reclining encoder check)
PROCEDURE 7
(Reclining motor check)EL-205
EL-2129Vehicle
speed
sensorPROCEDURE 12
(Vehicle speed sensor check)EL-217
3Seat
lifting
frontPROCEDURE 4
[Lifting encoder (front) check]
PROCEDURE 8
[Lifting motor (front) check]EL-207
EL-213
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AUTOMATIC DRIVE POSITIONER
On Board Diagnosis (Cont'd)
EL-197

PROCEDURE Diagnostic procedure
REFERENCE PAGE (EL- ) 213 214 215 216 217 220 220
SYMPTOM
DIAGNOSTIC PROCEDURE 8
[Lifting motor (front) check]
DIAGNOSTIC PROCEDURE 9
[Lifting motor (rear) check]
DIAGNOSTIC PROCEDURE 10
(Power seat switch check)
DIAGNOSTIC PROCEDURE 11
(Cancel switch check)
DIAGNOSTIC PROCEDURE 12
(Key, park position, door switch
and vehicle speed sensor check)
DIAGNOSTIC PROCEDURE 13
(Seat memory switch check)
DIAGNOSTIC PROCEDURE 14
(Memory indicator check)
1 No seat system functions operate.
2Some of the seat
system functions
do not operate
during automatic/
manual operation.Sliding
Reclining
Lifting (Front) X
Lifting (Rear) X
3No functions operate during auto-
matic operation, and some/all func-
tions do not during manual opera-
tion.XX
(ACC, ON
START
signal)
4Some of the seat
system functions
do not operate
during automatic
operation.Sliding
Reclining
Lifting (Front)
Lifting (Rear)
5No automatic operation functions
operate.XX
6Drive position cannot be retained in
the memory.X
(IGN ON
signal)X
7Does not operate
during manual
operation. (Oper-
ates during auto-
matic operation.)Sliding X
Reclining X
Lifting (Front) X
Lifting (Rear) X
8Automatic operation cannot be can-
celed.X
9 Memory indicator does not light up.X
X : Applicable
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AUTOMATIC DRIVE POSITIONER
Trouble Diagnoses (Cont'd)
EL-201

DIAGNOSTIC PROCEDURE 12=NBEL0214S15(Key, detention, door switch and vehicle speed sensor check)
1 CHECK KEY SWITCH INPUT SIGNAL
Check voltage between seat control unit LH terminal 2 and ground.
SEL629W
OK or NG
OK©GO TO 2.
NG©Check the following.
I7.5A fuse [No. 24, located in fuse block (J/B)]
IKey switch
IHarness for open or short between key switch and fuse
IHarness for open or short between seat control unit LH and key switch
2 CHECK IGNITION SWITCH INPUT SIGNAL (ON AND START)
Check voltage between seat control unit LH terminals and ground.
SEL630W
OK or NG
OK©GO TO 3.
NG©Check the following.
I7.5A fuse [No. 11, located in fuse block (J/B)]
I7.5A fuse [No. 26, located in fuse block (J/B)]
IHarness for open or short between seat control unit LH and fuse
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AUTOMATIC DRIVE POSITIONER
Trouble Diagnoses (Cont'd)
EL-217

3 CHECK PARK POSITION SWITCH INPUT SIGNAL
Check voltage between seat control unit LH terminal 21 and ground.
SEL631W
OK or NG
OK©GO TO 4.
NG©Check the following.
IPark position switch
IPark position switch ground circuit
IHarness for open or short between seat control unit LH and park position switch
4 CHECK DRIVER DOOR SWITCH INPUT SIGNAL
Check voltage between seat control unit LH terminal 9 and ground.
SEL632W
OK or NG
OK©GO TO 5.
NG©Check the following.
IDriver door switch
IDriver door switch ground circuit
IHarness for open or short between seat control unit LH and driver door switch
5 CHECK VEHICLE SPEED SENSOR
Does speedometer operate normally?
YesorNo
OK©GO TO 6.
NG©Check speedometer and vehicle speed sensor circuit. Refer to EL-104.
AUTOMATIC DRIVE POSITIONER
Trouble Diagnoses (Cont'd)
EL-218

6 CHECK VEHICLE SPEED SENSOR PULL UP VOLTAGE
1. Turn ignition switch ªONº.
2. Check voltage between seat control unit LH terminal 32 and ground.
SEL633W
OK or NG
OK©Harness for open or short between seat control unit LH and combination meter.
NG©Repair harness.
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AUTOMATIC DRIVE POSITIONER
Trouble Diagnoses (Cont'd)
EL-219

System DescriptionNBEL0216Refer to Owner's Manual for ASCD operating instructions.
POWER SUPPLY AND GROUNDNBEL0216S01Power is supplied at all times:
Ithrough 10A fuse [No. 14, located in the fuse block (J/B)]
Ito the stop lamp switch terminal 1, and
Ithrough 7.5A fuse (No. 52, located in fuse and fusible link box)
Ito the horn relay terminals 1 and 3.
When ignition switch is in the ON or START position, power is supplied:
Ithrough 7.5A fuse [No. 11, located in the fuse block (J/B)]
Ito ASCD brake switch terminal 1 and
Ito ASCD control unit terminal 5,
Ithrough 10A fuse [No. 18, located in the fuse block (J/B)]
Ito park/neutral position relay terminal 1,
Ithrough 10A fuse [No. 8, located in the fuse block (J/B)]
Ito combination meter terminal 66, and
When park/neutral position switch is in the P or N position, ground is supplied:
Ito park/neutral position relay terminal 2
Ithrough park/neutral position switch and body grounds B55 and B75.
When ASCD main switch is depressed (ON), ground is supplied:
Ito ASCD control unit terminal 9
Ifrom ASCD steering switch terminal 4
Ito ASCD steering switch terminal 5
Ithrough body grounds M4, M66 and M147
then ASCD control unit holds CRUISE condition and illuminates CRUISE indicator.
Ground is supplied:
Ifrom ASCD control unit terminal 15
Ito combination meter terminal 46.
OPERATIONNBEL0216S02Set OperationNBEL0216S0201To activate the ASCD, all following conditions must exist.
IGround supply to ASCD control unit terminal 9 (Main switch is in ON position.)
IPower supply to ASCD control unit terminal 8 (Brake pedal is released and A/T selector lever is in other
than P and N position.)
IVehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH). (Signal from combination meter)
When the SET/COAST switch is depressed, power is supplied:
Ifrom ASCD steering switch terminal 2
Ito ASCD control unit terminal 11.
And then ASCD pump is activated to control throttle wire and ASCD control unit supply ground
Ito combination meter terminals 51 to illuminate SET indicator.
A/T Overdrive Control during Cruise Control DrivingNBEL0216S0202When the vehicle speed is approximately 3 km/h (2 MPH) below set speed, a signal is sent
Ifrom ASCD control unit terminal 10
Ito TCM (transmission control module) terminal 24.
When this occurs, the TCM (transmission control module) cancels overdrive.
After vehicle speed is approximately 1 km/h (1 MPH) below set speed, overdrive is reactivated.
ASCD Shifting ControlNBEL0216S0203During ASCD cruise, ASCD control unit controls A/T shifting to avoid uncomfortable shifting.
This is used to control the signals below.
IThrottle position sensor from ECM
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System Description
EL-222

SEL255W
Fail-safe SystemNBEL0217DESCRIPTIONNBEL0217S01When the fail-safe system senses a malfunction, it deactivates
ASCD operation. The SET indicator in the combination meter will
then flash.
MALFUNCTION DETECTION CONDITIONSNBEL0217S02
Detection conditionsASCD operation during malfunc-
tion detection
IASCD steering (RESUME/ACCEL, CANCEL, SET/COAST) switch is stuck.
IVacuum motor ground circuit or power circuit is open or shorted.
IAir valve ground circuit or power circuit is open or shorted.
IRelease valve ground circuit or power circuit is open or shorted.
IVehicle speed sensor is faulty.
IASCD control unit internal circuit is malfunctioning.IASCD is deactivated.
IVehicle speed memory is can-
celed.
IASCD brake switch or stop lamp switch is faulty.IASCD is deactivated.
IVehicle speed memory is not
canceled.
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AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Fail-safe System
EL-229

Trouble DiagnosesNBEL0218SYMPTOM CHARTNBEL0218S01
PROCEDURE Diagnostic procedure
REFERENCE PAGE (EL- ) 231 232 233 234 235 235 237
SYMPTOM
FAIL-SAFE SYSTEM CHECK
POWER SUPPLY AND GROUND CIRCUIT CHECK
ASCD BRAKE/STOP LAMP SWITCH CHECK
ASCD STEERING SWITCH CHECK
VEHICLE SPEED SENSOR CHECK
ASCD PUMP CIRCUIT CHECK
ASCD ACTUATOR/PUMP CHECK
ASCD cannot be set. (ªCRUISEº indica-
tor lamp does not ON.)XXH3
ASCD cannot be set. (ªSETº indicator
lamp does not blink.)XXX
ASCD cannot be set. (ªSETº indicator
lamp blinks.H1)X XXXX
Vehicle speed does not decrease after
SET/COAST switch has been pressed.XX
Vehicle speed does not return to the set
speed after RESUME/ACCEL switch has
been pressed.H2XX
Vehicle speed does not increase after
RESUME/ACCEL switch has been
pressed.XX
System is not released after CANCEL
switch (steering) has been pressed.XX
Large difference between set speed and
actual vehicle speed.XXX
Deceleration is greatest immediately
after ASCD has been set.XXX
H1: It indicates that system is in fail-safe. After completing diagnostic procedures, perform ªFAIL-SAFE SYSTEM CHECKº (EL-231) to
verify repairs.
H2: If vehicle speed is greater than 40 km/h (25 MPH) after system has been released, pressing RESUME/ACCEL switch returns vehicle
speed to the set speed previously achieved. However, doing so when the ASCD main switch is turned to ªOFFº, vehicle speed will not
return to the set speed since the memory is canceled.
H3: Check only main switch built-in steering switch.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses
EL-230

SEL417V
FAIL-SAFE SYSTEM CHECK=NBEL0218S021. Turn ignition switch to ON position.
2. Turn ASCD main switch to ON and check if the SET indicator
blinks.
If the indicator lamp blinks, check the following.
IASCD steering switch. Refer to EL-234.
SEL767P
3. Drive the vehicle at more than 40 km/h (25 MPH) and push
SET/COAST switch.
If the indicator lamp blinks, check the following.
IVehicle speed sensor. Refer to EL-235.
IASCD pump circuit. Refer to EL-235.
IReplace control unit.
SAT797A
4. Depress brake pedal slowly (brake pedal should be depressed
more than 5 seconds).
If the indicator lamp blinks, check the following.
IASCD brake/stop lamp switch. Refer to EL-233.
5. END. (System is OK.)
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AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont'd)
EL-231

VEHICLE SPEED SENSOR CHECK=NBEL0218S06
1 CHECK SPEEDOMETER OPERATION
Does speedometer operate normally?
Ye s©GO TO 2.
No©Check speedometer and vehicle speed sensor circuit. Refer to wiring diagram in EL-228.
2 CHECK VEHICLE SPEED INPUT
1. Apply wheel chocks and jack up drive wheel.
2. Disconnect ASCD control unit harness connector.
3. Check voltage between control unit terminal 22 and ground with turning drive wheel slowly by hand.
SEL263WB
Refer to wiring diagram in EL-227.
Ye s©Vehicle speed sensor is OK.
No©Check harness for open or short between ASCD control unit terminal 22 and combination
meter terminal 13.
ASCD PUMP CIRCUIT CHECKNBEL0218S07
1 CHECK ASCD PUMP
1. Disconnect ASCD pump connector.
2. Measure resistance between ASCD pump terminals 1 and 2, 3, 4.
SEL262WB
Refer to wiring diagram in EL-227.
OK or NG
OK©GO TO 2.
NG©Replace ASCD pump.
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AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Trouble Diagnoses (Cont'd)
EL-235