Nissan Silvia. Manual — part 30
Wiring Diagram — AT — OVRCSV
NMAT0233
TAT260
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS FOR OVERRUN CLUTCH S/V
Wiring Diagram — AT — OVRCSV
AT-117
Diagnostic Procedure
NMAT0234
1
CHECK GROUND CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Disconnect solenoid valve harness connector (terminal cord assembly) E25 in engine compartment.
3. Check resistance between solenoid valve harness connector (terminal cord assembly) E25 terminal No. 3 (P/L) and
ground.
SAT804JA
Is resistance approx. 20 - 40
Ω
?
Yes
©
GO TO 2.
No
©
1. Remove control valve assembly.
Refer to AT-205.
2. Check the following items:
I
Overrun clutch solenoid valve
Refer to “Component Inspection”, AT-119.
I
Harness of terminal cord assembly for short or open
2
CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Disconnect TCM harness connector.
3. Check resistance between solenoid valve harness connector E25 terminal No. 3 (P/L) and TCM harness connector
M25 terminal No. 20 (P/L).
SAT805JA
If OK, check harness for short to ground and short to power.
Is resistance approx 0
Ω
?
Yes
©
GO TO 3.
No
©
Repair open circuit or short to ground or short to power in harness or connectors.
TROUBLE DIAGNOSIS FOR OVERRUN CLUTCH S/V
Diagnostic Procedure
AT-118
3
CHECK DTC
Perform Self-diagnosis Code confirmation procedure, AT-116.
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.
SAT392JD
Component Inspection
NMAT0235
OVERRUN CLUTCH SOLENOID VALVE
NMAT0235S01
I
For removal, refer to AT-205.
Resistance Check
NMAT0235S0101
I
Check resistance.
Terminal
Connector
Terminal No. (Wire color)
Resistance
(Approx.)
Ω
E402
4 (B)
Ground
20 - 40
SAT688IA
Operation Check
NMAT0235S0102
I
Check solenoid valve by listening for its operating sound while
applying battery voltage to the solenoid valve harness connec-
tor (terminal cord assembly) E403 terminal No. 4 (B) and
ground.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS FOR OVERRUN CLUTCH S/V
Diagnostic Procedure (Cont’d)
AT-119
SAT342HA
Description
NMAT0236
The torque converter clutch solenoid valve is activated, with the
gear in “D
4
”, by the TCM in response to signals sent from the
vehicle speed and throttle position sensors. Lock-up piston opera-
tion will then be controlled.
Lock-up operation, however, is prohibited when A/T fluid tempera-
ture is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up
condition, the engine speed should not change abruptly. If there is
a big jump in engine speed, there is no lock-up.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NMAT0236S01
Remarks: Specification data are reference values.
Monitor item
Condition
Specification
Torque converter clutch
solenoid valve duty
Lock-up “OFF”
"
Lock-up “ON”
Approximately 4%
"
Approximately 94%
TCM TERMINALS AND REFERENCE VALUE
NMAT0236S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
3
BR/R
Torque converter
clutch solenoid
valve
When A/T performs lock-up.
8 - 15V
When A/T does not perform lock-up.
0V
ON BOARD DIAGNOSIS LOGIC
NMAT0236S03
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: T/C CLUTCH SOL/V
TCM detects an improper voltage drop
when it tires to operate the solenoid
valve.
I
Harness or connectors
(The solenoid circuit is open or shorted.)
I
Torque converter clutch solenoid valve
: 7th judgement flicker
TROUBLE DIAGNOSIS FOR T/C CLUTCH SOL/V
Description
AT-120
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