Infiniti G20 (P11). Manual — part 24
Item
Symptom
Condition
Diagnostic Item
Reference Page
No Down
Shift
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)
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. Low one-way clutch
7. High clutch
8. Brake band
Shift Shock
Gear change shock felt during deceleration
by releasing accelerator pedal.
ON vehicle
1. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
2. Line pressure test
3. Overrun clutch solenoid valve
4. Control valve assembly
Improper
Shift Timing
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)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
2. Vehicle speed sensor·A/T
(Revolution sensor) and vehicle
speed sensor·MTR
Kickdown does not operate when depress-
ing pedal in “D
4
” within kickdown vehicle
speed.
ON vehicle
1. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
2. Revolution sensor and vehicle
speed sensor
3. Shift solenoid valve A
4. Shift solenoid valve B
Kickdown operates or engine overruns when
depressing pedal in “D
4
” beyond kickdown
vehicle speed limit.
ON vehicle
1. Vehicle speed sensor·A/T
(Revolution sensor) and vehicle
speed sensor·MTR
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Shift solenoid valve A
4. Shift solenoid valve B
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-93
Item
Symptom
Condition
Diagnostic Item
Reference Page
Slips/Will
Not Engage
Races extremely fast or slips in changing
from “D
4
” to “D
3
” when depressing pedal.
ON vehicle
1. Fluid level
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
OFF vehicle
6. High clutch
7. Forward clutch
Races extremely fast or slips in changing
from “D
4
” to “D
2
” when depressing pedal.
ON vehicle
1. Fluid level
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Line pressure test
4. Line pressure solenoid valve
5. Shift solenoid valve A
6. Control valve assembly
OFF vehicle
7. Brake band
8. Forward clutch
Races extremely fast or slips in changing
from “D
3
” to “D
2
” when depressing pedal.
ON vehicle
1. Fluid level
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
6. A/T fluid temperature sensor
OFF vehicle
7. Brake band
8. Forward clutch
9. High clutch
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-94
Item
Symptom
Condition
Diagnostic Item
Reference Page
Slips/Will
Not Engage
Races extremely fast or slips in changing
from “D
4
” or “D
3
” to “D
1
” when depressing
pedal.
ON vehicle
1. Fluid level
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
OFF vehicle
6. Forward clutch
7. Forward one-way clutch
8. Low one-way clutch
Vehicle will not run in any position.
ON vehicle
1. Fluid level
2. Control cable adjustment
3. Line pressure test
4. Line pressure solenoid valve
OFF vehicle
5. Oil pump
6. High clutch
7. Brake band
8. Low & reverse brake
9. Torque converter
10. Parking components
NOT USED
Transmission noise in “D”, “2”, “1” and “R”
positions.
ON vehicle
1. Fluid level
OFF vehicle
2. Torque converter
No Down
Shift
Failure to change from “D
3
” to “2
2
” when
changing lever into “2” position.
AT-237
ON vehicle
1. PNP switch adjustment
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Overrun clutch solenoid valve
4. Shift solenoid valve B
5. Shift solenoid valve A
6. Control valve assembly
7. Control cable adjustment
OFF vehicle
8. Brake band
9. Overrun clutch
Improper
Shift Timing
Gear change from “2
2
” to “2
3
” in “2” position. ON vehicle
1. PNP switch adjustment
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-95
Item
Symptom
Condition
Diagnostic Item
Reference Page
NOT USED
Engine brake does not operate in “1” posi-
tion.
AT-259
ON vehicle
1. PNP switch adjustment
2. Control cable adjustment
3. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
4. Vehicle speed sensor·A/T
(Revolution sensor) and vehicle
speed sensor·MTR
5. Shift solenoid valve A
6. Control valve assembly
7. Overrun clutch solenoid valve
OFF vehicle
8. Overrun clutch
9. Low & reverse brake
Improper
Shift Timing
Gear change from “1
1
” to “1
2
” in “1” position. ON vehicle
1. PNP switch adjustment
2. Control cable adjustment
No Down
Shift
Does not change from “1
2
” to “1
1
” in “1”
position.
ON vehicle
1. 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
Shift Shock
Large shock changing from “1
2
” to “1
1
” in “1”
position.
ON vehicle
1. Control valve assembly
OFF vehicle
2. Low & reverse brake
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-96
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