Infiniti G20 (P11). Manual — part 23
Item
Symptom
Condition
Diagnostic Item
Reference Page
No Up Shift
Failure to change gear from “D
1
” to “D
2
”.
ON vehicle
1. PNP switch adjustment
2. Control cable 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. PNP switch adjustment
2. Control cable 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
Failure to change gear from “D
3
” to “D
4
”.
ON vehicle
1. PNP switch adjustment
2. Control cable adjustment
3. Shift solenoid valve A
4. Vehicle speed sensor·A/T
(Revolution sensor) and vehicle
speed sensor·MTR
5. A/T fluid temperature sensor
OFF vehicle
6. Brake band
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)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
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
GI
MA
EM
LC
EC
FE
CL
MT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-89
Item
Symptom
Condition
Diagnostic Item
Reference Page
NOT USED
Engine stops when shifting lever into “R”,
“D”, “2” and “1”.
ON vehicle
1. Engine idling rpm
EC-53, “Idle
Speed/Ignition
Timing/Idle Mix-
ture Ratio Adjust-
ment”
2. Torque converter clutch sole-
noid valve
3. Control valve assembly
OFF vehicle
4. Torque converter
Shift Shock
Too sharp a shock in change from “D
1
” to
“D
2
”.
ON vehicle
1. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
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)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
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)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
2. Line pressure test
3. Control valve assembly
OFF vehicle
4. Brake band
5. Overrun clutch
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-90
Item
Symptom
Condition
Diagnostic Item
Reference Page
Slips/Will
Not Engage
Almost no shock or clutches slipping in
change from “D
1
” to “D
2
”.
ON vehicle
1. Fluid level
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Line pressure test
4. Accumulator servo release
5. Control valve assembly
OFF vehicle
6. Brake band
Almost no shock or slipping in change from
“D
2
” to “D
3
”.
ON vehicle
1. Fluid level
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Line pressure test
4. Control valve assembly
OFF vehicle
5. High clutch
6. Brake band
Almost no shock or slipping in change from
“D
3
” to “D
4
”.
ON vehicle
1. Fluid level
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Line pressure test
4. Control valve assembly
OFF vehicle
5. High clutch
6. Brake band
NOT USED
Vehicle braked by gear change from “D
1
” to
“D
2
”.
ON vehicle
1. Fluid level
OFF vehicle
2. Reverse clutch
3. Low & reverse brake
4. High clutch
5. Low one-way clutch
Vehicle braked by gear change from “D
2
” to
“D
3
”.
ON vehicle
1. Fluid level
OFF vehicle
2. Brake band
GI
MA
EM
LC
EC
FE
CL
MT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-91
Item
Symptom
Condition
Diagnostic Item
Reference Page
NOT USED
Vehicle braked by gear change from “D
3
” to
“D
4
”.
ON vehicle
1. Fluid level
OFF vehicle
2. Overrun clutch
3. Forward one-way clutch
4. Reverse clutch
Maximum speed not attained. Acceleration
poor.
ON vehicle
1. Fluid level
2. PNP switch adjustment
3. Shift solenoid valve A
4. Shift solenoid valve B
5. Control valve assembly
OFF vehicle
6. Reverse clutch
7. High clutch
8. Brake band
9. Low & reverse brake
10. Oil pump
11. Torque converter
No Down
Shift
Failure to change gear from “D
4
” to “D
3
”.
ON vehicle
1. Fluid level
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
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)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Shift solenoid valve A
4. Shift solenoid valve B
5. Control valve assembly
OFF vehicle
6. High clutch
7. Brake band
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-92
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