Infiniti G20 (P11). Manual — part 22
7
CHECK ENGINE BRAKE
Does vehicle decelerate by engine brake?
SAT778B
Yes or No
Yes
©
1. Stop vehicle.
2. Perform self-diagnosis. Refer to TCM SELF-DIAGNOSTIC PROCEDURE (NO
TOOLS), AT-49.
No
©
Go to “20. Vehicle Does Not Decelerate By Engine Brake”, AT-263. Continue ROAD
TEST.
GI
MA
EM
LC
EC
FE
CL
MT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — BASIC INSPECTION
Road Test (Cont’d)
AT-85
Symptom Chart
NCAT0029
Numbers are arranged in order of inspection.
Perform inspections starting with number one and work up.
Item
Symptom
Condition
Diagnostic Item
Reference Page
NOT USED
Engine cannot start in “P” and “N” positions.
AT-228
ON vehicle
1. Ignition switch and starter
EL-9, “POWER
SUPPLY ROUT-
ING” and SC-10,
“STARTING SYS-
TEM”
2. Control cable adjustment
3. PNP switch adjustment
Engine starts in position other than “N” and
“P” positions.
AT-228
ON vehicle
1. Control cable adjustment
2. PNP switch adjustment
Transaxle noise in “P” and “N” positions.
ON vehicle
1. Fluid level
2. Line pressure test
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. Engine speed signal
OFF vehicle
6. Oil pump
7. Torque converter
Vehicle moves when changing into “P”
position, or parking gear does not disen-
gage when shifted out of “P” position.
AT-229
ON vehicle
1. Control cable adjustment
OFF vehicle
2. Parking components
Vehicle runs in “N” position.
AT-230
ON vehicle
1. Control cable adjustment
OFF vehicle
2. Forward clutch
3. Reverse clutch
4. Overrun clutch
Slip/Will Not
Engage
Vehicle will not run in “R” position (but runs
in “D”, “2” and “1” positions). Clutch slips.
Very poor acceleration.
AT-234
ON vehicle
1. Control cable adjustment
2. Line pressure test
3. Line pressure solenoid valve
4. Control valve assembly
OFF vehicle
5. Reverse clutch
6. High clutch
7. Forward clutch
8. Overrun clutch
9. Low & reverse brake
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart
AT-86
Item
Symptom
Condition
Diagnostic Item
Reference Page
NOT USED
Vehicle braked when shifting into “R” posi-
tion.
ON vehicle
1. Fluid level
2. Control cable adjustment
3. Line pressure test
4. Line pressure solenoid valve
5. Control valve assembly
OFF vehicle
6. High clutch
7. Brake band
8. Forward clutch
9. Overrun clutch
Shift Shock
Sharp shock in shifting from “N” to “D” posi-
tion.
ON vehicle
1. Engine idling rpm
2. Throttle position sensor
(Adjustment)
EC-177, “DTC
P0120
THROTTLE
POSITION SEN-
SOR”
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. Forward clutch
Slips/Will
Not Engage
Vehicle will not run in “D” and “2” positions
(but runs in “1” and “R” positions).
ON vehicle
1. Control cable adjustment
OFF vehicle
2. Low one-way clutch
Vehicle will not run in “D”, “1”, “2” positions
(but runs in “R” position). Clutch slips. Very
poor acceleration.
AT-237
ON vehicle
1. Fluid level
2. Line pressure test
3. Line pressure solenoid valve
4. Control valve assembly
5. Accumulator N-D
OFF vehicle
6. Reverse clutch
7. High clutch
8. Forward clutch
9. Forward one-way clutch
10. Low one-way clutch
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-87
Item
Symptom
Condition
Diagnostic Item
Reference Page
Slips/Will
Not Engage
Clutches or brakes slip somewhat in start-
ing.
ON vehicle
1. Fluid level
2. Control cable 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
7. Accumulator N-D
OFF vehicle
8. Forward clutch
9. Reverse clutch
10. Low & reverse brake
11. Oil pump
12. Torque converter
NOT USED
Excessive creep.
ON vehicle
1. Engine idling rpm
EC-53, “Idle
Speed/Ignition
Timing/Idle Mix-
ture Ratio Adjust-
ment”
Slips/Will
Not Engage
ON vehicle
1. Fluid level
2. Line pressure test
3. Control valve assembly
OFF vehicle
4. Forward clutch
5. Oil pump
6. Torque converter
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Chart (Cont’d)
AT-88
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