Infiniti QX4 (R50). Manual — part 21
Symptom Chart
NBAT0233
Numbers are arranged in order of inspection.
Perform inspections starting with number one and work up.
Items
Symptom
Condition
Diagnostic Item
Reference Page
No Lock-up
Engagement/TCC
Inoperative
Torque converter
is not locked up.
ON vehicle
1. Throttle position sensor (Adjustment)
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Park/neutral position (PNP) switch
adjustment
4. Engine speed signal
5. A/T fluid temperature sensor
6. Line pressure test
7. Torque converter clutch solenoid valve
8. Control valve assembly
OFF vehicle
9. Torque converter
Torque converter
clutch piston slip.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
3. Line pressure test
4. Torque converter clutch solenoid valve
5. Line pressure solenoid valve
6. Control valve assembly
OFF vehicle
7. Torque converter
Lock-up point is
extremely high or
low.
AT-245
ON vehicle
1. Throttle position sensor (Adjustment)
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Torque converter clutch solenoid valve
4. Control valve assembly
Shift Shock
Sharp shock in
shifting from N to
D position.
ON vehicle
1. Engine idling rpm
2. Throttle position sensor (Adjustment)
3. Line pressure test
4. A/T fluid temperature sensor
5. Engine speed signal
6. Line pressure solenoid valve
7. Control valve assembly
8. Accumulator N-D
OFF vehicle
9. Turbine revolution sensor
10. Forward clutch
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart
AT-81
Items
Symptom
Condition
Diagnostic Item
Reference Page
Shift Shock
Too sharp a
shock in change
from D
1
to D
2
.
ON vehicle
1. Throttle position sensor (Adjustment)
2. Line pressure test
3. Accumulator servo release
4. Control valve assembly
5. A/T fluid temperature sensor
OFF vehicle
6. Brake band
Too sharp a
shock in change
from D
2
to D
3
.
ON vehicle
1. Throttle position sensor (Adjustment)
2. Line pressure test
3. Control valve assembly
OFF vehicle
4. High clutch
5. Brake band
Too sharp a
shock in change
from D
3
to D
4
.
ON vehicle
1. Throttle position sensor (Adjustment)
2. Line pressure test
3. Control valve assembly
OFF vehicle
4. Brake band
5. Overrun clutch
Gear change
shock felt during
deceleration by
releasing accel-
erator pedal.
ON vehicle
1. Throttle position sensor (Adjustment)
2. Line pressure test
3. Overrun clutch solenoid valve
4. Control valve assembly
Large shock
changing from 1
2
to 1
1
in 1 position.
ON vehicle
1. Control valve assembly
ON vehicle
2. Low & reverse brake
Improper Shift
Timing
Too high a gear
change point from
D
1
to D
2
, from D
2
to D
3
, from D
3
to
D
4
.
ON vehicle
1. Throttle position sensor (Adjustment)
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Shift solenoid valve A
4. Shift solenoid valve B
Gear change
directly from D
1
to
D
3
occurs.
ON vehicle
1. Fluid level
2. Accumulator servo release
OFF vehicle
3. Brake band
Too high a
change point from
D
4
to D
3
, from D
3
to D
2
, from D
2
to
D
1
.
ON vehicle
1. Throttle position sensor (Adjustment)
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
Kickdown does
not operate when
depressing pedal
in D
4
within kick-
down vehicle
speed.
ON vehicle
1. Throttle position sensor (Adjustment)
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Shift solenoid valve A
4. Shift solenoid valve B
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-82
Items
Symptom
Condition
Diagnostic Item
Reference Page
Improper Shift
Timing
Kickdown oper-
ates or engine
overruns when
depressing pedal
in D
4
beyond kick-
down vehicle
speed limit.
ON vehicle
1. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
2. Throttle position sensor (Adjustment)
3. Shift solenoid valve A
4. Shift solenoid valve B
Gear change from
2
2
to 2
3
in 2 posi-
tion.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
Gear change from
1
1
to 1
2
in 1 posi-
tion.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Manual control linkage adjustment
No Down Shift
Failure to change
gear from D
4
to
D
3
.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
3. Overrun clutch solenoid valve
4. Shift solenoid valve A
5. Line pressure solenoid valve
6. Control valve assembly
OFF vehicle
7. Low & reverse brake
8. Overrun clutch
Failure to change
gear from D
3
to
D
2
or from D
4
to
D
2
.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
3. Shift solenoid valve A
4. Shift solenoid valve B
5. Control valve assembly
OFF vehicle
6. High clutch
7. Brake band
Failure to change
gear from D
2
to
D
1
or from D
3
to
D
1
.
ON vehicle
1. Fluid level
2. Throttle position sensor (Adjustment)
3. Shift solenoid valve A
4. Shift solenoid valve B
5. Control valve assembly
OFF vehicle
6. Low one-way clutch
7. High clutch
8. Brake band
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-83
Items
Symptom
Condition
Diagnostic Item
Reference Page
No Down Shift
Failure to change
from D
3
to 2
2
when changing
lever into 2 posi-
tion.
AT-250
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Throttle position sensor (Adjustment)
3. Overrun clutch solenoid valve
4. Shift solenoid valve B
5. Shift solenoid valve A
6. Control valve assembly
7. Manual control linkage adjustment
OFF vehicle
8. Brake band
9. Overrun clutch
Does not change
from 1
2
to 1
1
in 1
position.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
3. Shift solenoid valve A
4. Control valve assembly
5. Overrun clutch solenoid valve
OFF vehicle
6. Overrun clutch
7. Low & reverse brake
No Up Shift
Failure to change
gear from D
1
to
D
2
.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Manual control linkage adjustment
3. Shift solenoid valve A
4. Control valve assembly
5. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
OFF vehicle
6. Brake band
Failure to change
gear from D
2
to
D
3
.
ON vehicle
1. Park/neutral position (PNP) switch
adjustment
2. Manual control linkage adjustment
3. Shift solenoid valve B
4. Control valve assembly
5. Vehicle speed sensor·A/T (Revolution
sensor) and vehicle speed sensor·MTR
OFF vehicle
6. High clutch
7. Brake band
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-84
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