Nissan 240SX - Automatic Transmission (Section AT) (2000 year). Instruction - part 12
15. A/T Does Not Perform Lock-up
=NMAT0084
SYMPTOM:
A/T does not perform lock-up at the specified speed.
1
CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to torque converter clutch solenoid valve circuit after cruise test?
SAT844H
Yes or No
Yes
©
Check torque converter clutch solenoid valve circuit. Refer to AT-120.
No
©
GO TO 2.
2
CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to EC-141, “Component Description”.
SAT414K
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace throttle position sensor.
3
DETECT MALFUNCTIONING ITEM
1. Remove control valve. Refer to AT-205.
2. Check following items:
I
Torque converter clutch control valve
I
Torque converter relief valve
I
Torque converter clutch solenoid valve
I
Pilot valve
I
Pilot filter
OK or NG
OK
©
GO TO 4.
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
15. A/T Does Not Perform Lock-up
AT-177
4
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
TROUBLE DIAGNOSES FOR SYMPTOMS
15. A/T Does Not Perform Lock-up (Cont’d)
AT-178
16. A/T Does Not Hold Lock-up Condition
=NMAT0085
SYMPTOM:
A/T does not hold lock-up condition for more than 30 seconds.
1
CHECK DIAGNOSTIC RESULTS
Does self-diagnosis show damage to engine speed signal circuit after cruise test?
SAT835H
Yes or No
Yes
©
Check engine speed signal circuit. Refer to AT-132.
No
©
GO TO 2.
2
CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 5.
3
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-205.
2. Check the following items:
I
Torque converter clutch control valve
I
Pilot valve
I
Pilot filter
OK or NG
OK
©
GO TO 4.
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
16. A/T Does Not Hold Lock-up Condition
AT-179
4
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
5
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-205.
2. Check the following items:
I
Torque converter clutch control valve
I
Pilot valve
I
Pilot filter
3. Disassemble A/T.
4. Check torque converter and oil pump assembly.
OK or NG
OK
©
GO TO 4.
NG
©
Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
16. A/T Does Not Hold Lock-up Condition (Cont’d)
AT-180
17. Lock-up Is Not Released
=NMAT0086
SYMPTOM:
Lock-up is not released when accelerator pedal is released.
1
CHECK THROTTLE POSITION SWITCH CIRCUIT
With CONSULT-II
Does “TCM INPUT SIGNALS” in Data Monitor show damage to closed throttle position switch circuit?
Without CONSULT-II
Does self-diagnosis show damage to closed throttle position switch circuit?
SAT146BA
Yes or No
Yes
©
Check closed throttle position switch circuit. Refer to AT-189.
No
©
GO TO 2.
2
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
17. Lock-up Is Not Released
AT-181
18. Engine Speed Does Not Return To Idle
(Light Braking D
4
→
D
3
)
=NMAT0087
SYMPTOM:
I
Engine speed does not smoothly return to idle when A/T
shifts from D
4
to D
3
.
I
Vehicle does not decelerate by engine brake when turning
overdrive control switch OFF.
I
Vehicle does not decelerate by engine brake when shifting
A/T from “D” to “2” position.
1
CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to overrun clutch solenoid valve circuit after cruise test?
SAT836H
Yes or No
Yes
©
Check overrun clutch solenoid valve circuit. Refer to AT-116.
No
©
GO TO 2.
2
CHECK THROTTLE POSITION SENSOR
Check throttle position sensor. Refer to EC-141, “Component Description”.
SAT414K
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace throttle position sensor.
TROUBLE DIAGNOSES FOR SYMPTOMS
18. Engine Speed Does Not Return To Idle (Light Braking D
4
→
D
3
)
AT-182
3
CHECK A/T FLUID CONDITION
1. Remove oil pan.
2. Check A/T fluid condition.
SAT171B
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 6.
4
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-205.
2. Check the following items:
I
Overrun clutch control valve
I
Overrun clutch reducing valve
I
Overrun clutch solenoid valve
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace damaged parts.
5
CHECK SYMPTOM
Check again.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
6
DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to AT-205.
2. Check the following items:
I
Overrun clutch control valve
I
Overrun clutch reducing valve
I
Overrun clutch solenoid valve
3. Disassemble A/T.
4. Check the following items:
I
Overrun clutch assembly
I
Oil pump assembly
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
18. Engine Speed Does Not Return To Idle (Light Braking D
4
→
D
3
) (Cont’d)
AT-183
19. Vehicle Does Not Start From D
1
=NMAT0088
SYMPTOM:
Vehicle does not start from D
1
on Cruise test — Part 2.
1
CHECK SELF-DIAGNOSTIC RESULTS
Does self-diagnosis show damage to vehicle speed sensor·A/T (revolution sensor), shift solenoid valve A, B or vehicle
speed sensor·MTR after cruise test?
SAT832H
Yes or No
Yes
©
Check damaged circuit. Refer to AT-89, AT-95, AT-106 or AT-111.
No
©
GO TO 2.
2
CHECK SYMPTOM
Check again.
OK or NG
OK
©
Go to “11. Vehicle Cannot Be Started From D
1
”, AT-165.
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
TROUBLE DIAGNOSES FOR SYMPTOMS
19. Vehicle Does Not Start From D
1
AT-184
20. A/T Does Not Shift: D
4
→
D
3
, When
Overdrive Control Switch “ON”
→
“OFF”
=NMAT0089
SYMPTOM:
A/T does not shift from D
4
to D
3
when changing overdrive
control switch to “OFF” position.
1
CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
With CONSULT-II
Does “TCM INPUT SIGNALS” in Data Monitor show damage to overdrive control switch circuit?
Without CONSULT-II
Does self-diagnosis show damage to overdrive control switch circuit?
SAT146BA
Yes or No
Yes
©
Check overdrive control switch circuit. Refer to AT-189.
No
©
Go to “13. A/T Does Not Shift: D
2
,
D
3
”, AT-171.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
20. A/T Does Not Shift: D
4
→
D
3
, When Overdrive Control Switch “ON”
→
“OFF”
AT-185
21. A/T Does Not Shift: D
3
→
2
2
, When Selector
Lever “D”
→
“2” Position
=NMAT0090
SYMPTOM:
A/T does not shift from D
3
to 2
2
when changing selector lever
from “D” to “2” position.
1
CHECK PNP SWITCH CIRCUIT
With CONSULT-II
Does “TCM INPUT SIGNALS” in Data Monitor show damage to PNP switch circuit?
Without CONSULT-II
Does self-diagnosis show damage to PNP switch circuit?
SAT146BA
Yes or No
Yes
©
Check PNP switch circuit. Refer to AT-189.
No
©
Go to “12. A/T Does Not Shift: D
1
,
D
2
Or Does Not Kickdown: D
4
,
D
2
”, AT-168.
TROUBLE DIAGNOSES FOR SYMPTOMS
21. A/T Does Not Shift: D
3
→
2
2
, When Selector Lever “D”
→
“2” Position
AT-186
22. A/T Does Not Shift: 2
2
→
1
1
, When Selector
Lever “2”
→
“1” Position
=NMAT0091
SYMPTOM:
A/T does not shift from 2
2
to 1
1
when changing selector lever
from “2” to “1” position.
1
CHECK PNP SWITCH CIRCUIT
With CONSULT-II
Does “TCM INPUT SIGNALS” in Data Monitor show damage to PNP switch circuit?
Without CONSULT-II
Does self-diagnosis show damage to PNP switch circuit?
SAT146BA
Yes or No
Yes
©
Check PNP switch circuit. Refer to AT-189.
No
©
GO TO 2.
2
CHECK SYMPTOM
Check again.
SAT778B
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
22. A/T Does Not Shift: 2
2
→
1
1
, When Selector Lever “2”
→
“1” Position
AT-187
23. Vehicle Does Not Decelerate By Engine
Brake
=NMAT0092
SYMPTOM:
Vehicle does not decelerate by engine brake when shifting
from 2
2
(1
2
) to 1
1
.
1
CHECK SYMPTOM
Is “6. Vehicle Does Not Creep Backward In “R” Position” OK?
Yes or No
Yes
©
Go to “18. Engine Speed Does Not Return To Idle (Light Braking D
4
,
D
3
)”, AT-182.
No
©
Go to “9. Vehicle Does Not Creep Backward In “R” Position”, AT-159.
TROUBLE DIAGNOSES FOR SYMPTOMS
23. Vehicle Does Not Decelerate By Engine Brake
AT-188
SAT338HC
24. TCM Self-diagnosis Does Not Activate (PNP,
Overdrive Control, A/T Check and TP Switches
Circuit Checks)
NMAT0204
SAT415K
SAT416K
SAT413K
DESCRIPTION
NMAT0204S01
I
PNP switch
The PNP switch assemble includes a transmission range
switch. The transmission range switch detects the selector
position and sends a signal to the TCM.
I
Overdrive control and A/T mode switch
Detects the switch position (ON or OFF) and sends a signal to
the TCM.
I
Throttle position switch
Consists of a wide open throttle position switch and a closed
throttle position switch.
The wide open throttle position switch sends a signal to the
TCM when the throttle valve is open at least 1/2 of the full
throttle position. The closed throttle position switch sends a
signal to the TCM when the throttle valve is fully closed.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
24. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control, A/T Check and TP Switches Circuit Checks)
AT-189
DIAGNOSTIC PROCEDURE
=NMAT0204S03
NOTE:
The diagnostic procedure includes inspections for the overdrive
control and throttle position switch circuits.
1
CHECK PNP SWITCH CIRCUIT (With CONSULT-II)
With CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out “P”, “R”, “N”, “D”, “2” and “1” position switches moving selector lever to each position. Check the signal of the
selector lever position is indicated properly.
SAT643J
OK or NG
OK
©
GO TO 3.
NG
©
Check the following items:
I
PNP switch
Refer to “Component Inspection”, AT-196.
I
Harness for short or open between ignition switch and PNP switch (Main harness)
I
Harness for short or open between PNP switch and TCM (Main harness)
I
Joint connector-2
TROUBLE DIAGNOSES FOR SYMPTOMS
24. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control, A/T Check and TP Switches Circuit Checks) (Cont’d)
AT-190
2
CHECK PNP SWITCH CIRCUIT (Without CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Check voltage between TCM harness connector M26 terminals No. 26 (P), 27 (LG), 34 (LG/B), 35 (PU), 36 (GY) and
ground while moving selector lever through each position.
MTBL0205
SAT517J
Does battery voltage exist (B) or non-existent (0)?
Yes
©
GO TO 3.
No
©
Check the following items:
I
PNP switch
Refer to “Component Inspection”, AT-196.
I
Harness for short or open between ignition switch and PNP switch (Main harness)
I
Harness for short or open between PNP switch and TCM (Main harness)
I
Joint connector-2
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
24. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control, A/T Check and TP Switches Circuit Checks) (Cont’d)
AT-191
3
CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out “OVERDRIVE SWITCH”. Check the signal of the overdrive control switch is indicated properly.
(Overdrive control switch “ON” displayed on CONSULT-II means overdrive “OFF”.)
SAT645J
Without CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Check voltage between TCM harness connector M25 terminal No. 22 (L/B) and ground when overdrive control switch is
“ON” and “OFF”.
Voltage:
Switch position “ON”:
Battery voltage
Switch position “OFF”:
1V or less
SAT531JB
OK or NG
OK (With CONSULT-II)
©
GO TO 4.
OK (Without CONSULT-
II)
©
GO TO 5.
NG
©
Check the following items:
I
Overdrive control switch
Refer to “Component Inspection”, AT-196.
I
Harness for short or open between TCM and overdrive control switch (Main harness)
I
Harness for short or open of ground circuit for overdrive control switch (Main harness)
TROUBLE DIAGNOSES FOR SYMPTOMS
24. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control, A/T Check and TP Switches Circuit Checks) (Cont’d)
AT-192