Nissan Silvia. Manual — part 34
Wiring Diagram — AT — ENGSS
NMAT0245
TAT263
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS FOR ENGINE SPEED SIG
Wiring Diagram — AT — ENGSS
AT-133
Diagnostic Procedure
NMAT0246
1
CHECK DTC WITH ECM
Perform diagnostic test mode II (self-diagnostic results) for engine control. Check ignition signal circuit condition.
OK or NG
OK (With CONSULT-II)
©
GO TO 2.
OK (Without CONSULT-
II)
©
GO TO 3.
NG
©
Check ignition signal circuit for engine control. Refer to EC-110, “Component Descrip-
tion”.
2
CHECK INPUT SIGNAL (WITH CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out the value of “ENGINE SPEED”.
Check engine speed changes according to throttle position.
SAT645J
OK or NG
OK
©
GO TO 4.
NG
©
Check the following items:
I
Harness for short or open between TCM and ECM
I
Resistor
I
Ignition coil
Refer to EC-110, “Component Description”.
TROUBLE DIAGNOSIS FOR ENGINE SPEED SIG
Diagnostic Procedure
AT-134
3
CHECK INPUT SIGNAL (WITHOUT CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM harness connector M26 terminal No. 39 (L/OR) and ground.
SAT520JC
Does battery voltage (idle speed)? Refer to EC-76, “ECM Inspection Table”.
Yes
©
GO TO 4.
No
©
Check the following items:
I
Harness for short or open between TCM and ECM
I
Resistor
I
Ignition coil
Refer to EC-110, “Component Description”.
4
CHECK DTC
Perform Self-diagnosis Code confirmation procedure, AT-132.
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 DIAGNOSIS FOR ENGINE SPEED SIG
Diagnostic Procedure (Cont’d)
AT-135
SAT341H
Description
NMAT0247
The line pressure solenoid valve regulates the oil pump discharge
pressure to suit the driving condition in response to a signal sent
from the TCM.
The line pressure duty cycle value is not consistent when the
closed throttle position switch is “ON”. To confirm the line
pressure duty cycle at low pressure, the accelerator (throttle)
should be open until the closed throttle position switch is
“OFF”.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NMAT0247S01
Remarks: Specification data are reference values.
Monitor item
Condition
Specification
Line pressure solenoid
valve duty
Small throttle opening (Low line pressure)
"
Large throttle opening (High line pressure)
Approximately 24%
"
Approximately 95%
NOTE:
The line pressure duty cycle value is not consistent when the closed throttle position switch is “ON”. To confirm the line pressure duty
cycle at low pressure, the accelerator (throttle) should be open until the closed throttle position switch is “OFF”.
TCM TERMINALS AND REFERENCE VALUE
NMAT0247S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
1
OR/B
Line pressure
solenoid valve
When releasing accelerator pedal after warm-
ing up engine.
1.5 - 2.5V
When depressing accelerator pedal fully after
warming up engine.
0V
2
P
Line pressure
solenoid valve
(with dropping
resistor)
When releasing accelerator pedal after warm-
ing up engine.
5 - 14V
When depressing accelerator pedal fully after
warming up engine.
0V
ON BOARD DIAGNOSIS LOGIC
NMAT0247S03
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: LINE PRESSURE S/V
TCM detects an improper voltage drop
when it tries to operate the solenoid
valve.
I
Harness or connectors
(The solenoid circuit is open or shorted.)
I
Line pressure solenoid valve
: 10th judgement flicker
TROUBLE DIAGNOSIS FOR LINE PRESSURE S/V
Description
AT-136
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