Infiniti G20 (P11). Manual — part 25
Item
Symptom
Condition
Diagnostic Item
Reference Page
NOT USED
Transmission overheats.
ON vehicle
1. Fluid level
2. Engine idling rpm
EC-53, “Idle
speed/ignition
timing/idle mixture
ratio adjustment”
3. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
4. Line pressure test
5. Line pressure solenoid valve
6. Control valve assembly
OFF vehicle
7. Oil pump
8. Reverse clutch
9. High clutch
10. Brake band
11. Forward clutch
12. Overrun clutch
13. Low & reverse brake
14. Torque converter
ATF shoots out during operation. White
smoke emitted from exhaust pipe during
operation.
ON vehicle
1. Fluid level
OFF vehicle
2. Reverse clutch
3. High clutch
4. Brake band
5. Forward clutch
6. Overrun clutch
7. Low & reverse brake
NOT USED
Offensive smell at fluid charging pipe.
ON vehicle
1. Fluid level
OFF vehicle
2. Torque converter
3. Oil pump
4. Reverse clutch
5. High clutch
6. Brake band
7. Forward clutch
8. Overrun clutch
9. Low & reverse brake
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-97
Item
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)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
2. Vehicle speed sensor·A/T
(Revolution sensor) and vehicle
speed sensor·MTR
3. PNP switch adjustment
4. Engine speed signal
5. A/T fluid temperature sensor
6. Line pressure test
7. Torque converter clutch sole-
noid 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)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
3. Line pressure test
4. Torque converter clutch sole-
noid valve
5. Line pressure solenoid valve
6. Control valve assembly
OFF vehicle
7. Torque converter
Lock-up point is extremely high or low.
AT-252
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. Torque converter clutch sole-
noid valve
4. Control valve assembly
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-98
Item
Symptom
Condition
Diagnostic Item
Reference Page
No Up Shift
A/T does not shift to “D
4
” when driving with
overdrive control switch “ON”.
ON vehicle
1. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
2. PNP switch adjustment
3. Vehicle speed sensor·A/T
(Revolution sensor) and vehicle
speed sensor·MTR
4. Shift solenoid valve A
5. Overrun clutch solenoid valve
6. Control valve assembly
7. A/T fluid temperature sensor
8. Line pressure test
OFF vehicle
9. Brake band
10. Overrun clutch
NOT USED
Engine is stopped at “R”, “D”, “2” and “1”
positions.
ON vehicle
1. Fluid level
2. Torque converter clutch sole-
noid valve
3. Shift solenoid valve B
4. Shift solenoid valve A
5. Control valve assembly
SAT216J
TCM Terminals and Reference Value
NCAT0030
PREPARATION
NCAT0030S01
I
Measure voltage between each terminal and terminal 25 or 48
by following “TCM INSPECTION TABLE”.
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-99
TCM HARNESS CONNECTOR TERMINAL LAYOUT
NCAT0030S02
SAT403J
TCM INSPECTION TABLE
NCAT0030S03
(Data are reference values.)
Terminal
No.
Wire color
Item
Condition
Judgement stan-
dard
(Approx.)
1
R/W
Line pressure
solenoid valve
When releasing accelerator pedal
after warming up engine.
1.5 - 2.5V
When depressing accelerator pedal
fully after warming up engine.
0V
2
P/B
Line pressure
solenoid valve
(with dropping
resistor)
When releasing accelerator pedal
after warming up engine.
5 - 14V
When depressing accelerator pedal
fully after warming up engine.
0V
3
GY/R
Torque converter
clutch solenoid
valve
When A/T performs lock-up.
8 - 15V
When A/T does not perform lock-up. 0V
5 *2
Y/R
—
—
—
6 *2
Y/G
—
—
—
7 *2
Y/B
—
—
—
8*2
BR/W
—
—
—
9*2
G/Y
—
—
—
10
R
Power source
When turning ignition switch to
“ON”.
Battery voltage
When turning ignition switch to
“OFF”.
0V
11
L/W
Shift solenoid
valve A
When shift solenoid valve A oper-
ates.
(When driving in “D
1
” or “D
4
”.)
Battery voltage
When shift solenoid valve A does
not operate.
(When driving in “D
2
” or “D
3
”.)
0V
12
L/Y
Shift solenoid
valve B
When shift solenoid valve B oper-
ates.
(When driving in “D
1
” or “D
2
”.)
Battery voltage
When shift solenoid valve B does
not operate.
(When driving in “D
3
” or “D
4
”.)
0V
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
TCM Terminals and Reference Value (Cont’d)
AT-100
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