Nissan Silvia. Instruction — part 25
Diagnostic Procedure
NMAT0219
1
CHECK INPUT SIGNAL.
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 “VHCL/S SE·MTR” while driving.
Check the value changes according to driving speed.
SAT614J
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM harness connector M26 terminal No. 40 (W/PU) and ground while driving at 2 to 3 km/h
(1 to 2 MPH) for 1 m (3 ft) or more.
SAT528JA
Does battery voltage vary between less than 1V and more than 4.5V?
Yes
©
GO TO 2.
No
©
Check the following items:
I
Vehicle speed sensor and ground circuit for vehicle speed sensor (Refer to EL-58,
“Component Parts and Harness Connector Location”.)
I
Harness for short or open between TCM and vehicle speed sensor (Main harness)
I
Harness for short or open between ABS control unit and combination meter
2
CHECK DTC
Perform Self-diagnosis Code confirmation procedure, AT-95.
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 VHCL SPEED SEN·MTR
Diagnostic Procedure
AT-97
SAT413K
Description
NMAT0220
I
Throttle position sensor
The throttle position sensor detects the throttle valve position
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 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.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NMAT0220S01
Remarks: Specification data are reference values.
Monitor item
Condition
Specification
Throttle position sensor
Fully-closed throttle
Approximately 0.5V
Fully-open throttle
Approximately 4V
TCM TERMINALS AND REFERENCE VALUE
NMAT0220S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
16
LG
Closed throttle
position switch
(in throttle
position switch)
When releasing accelerator pedal after
warming up engine.
Battery voltage
When depressing accelerator pedal after
warming up engine.
0V
17
R
Wide open throttle
position switch
(in throttle
position switch)
When depressing accelerator pedal more
than half-way after warming up engine.
Battery voltage
When releasing accelerator pedal after
warming up engine.
0V
32
LG/R
Throttle position
sensor
(Power source)
Ignition switch “ON”.
4.5 - 5.5V
Ignition switch “OFF”.
0V
41
R/Y
Throttle position
sensor
When depressing accelerator pedal slowly
after warming up engine.
(Voltage rises gradually in response to
throttle position.)
Fully-closed
throttle:
0.5V
Fully-open
throttle:
4V
42
G/Y
Throttle position
sensor
(Ground)
—
0V
TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN
Description
AT-98
ON BOARD DIAGNOSIS LOGIC
=NMAT0220S03
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: THROTTLE POSI SEN
TCM receives an excessively low or high
voltage from the sensor.
I
Harness or connectors
(The solenoid circuit is open or shorted.)
I
Throttle position sensor
I
Throttle position switch
: 3rd judgement flicker
SAT014K
SAT808H
SELF-DIAGNOSIS CODE CONFIRMATION PROCEDURE
NMAT0220S05
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
WITH CONSULT-II
NMAT0220S06
1)
Start engine.
2)
Select “SELF-DIAG RESULTS” mode for “A/T” with CON-
SULT-II.
3)
Drive vehicle under the following conditions:
Selector lever in “D” position, vehicle speed higher than 10
km/h (6 MPH), throttle opening greater than 1/2 of the full
throttle position and driving for more than 3 seconds.
WITHOUT CONSULT-II
NMAT0220S07
1)
Start engine.
2)
Drive vehicle under the following conditions:
Selector lever in “D” position, vehicle speed higher than 10
km/h (6 MPH), throttle opening greater than 1/2 of the full
throttle position and driving for more than 3 seconds.
3)
Perform self-diagnosis.
Refer
to
SELF-DIAGNOSTIC
PROCEDURE
(Without
CONSULT-II), AT-37.
GI
MA
EM
LC
EC
FE
CL
MT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN
Description (Cont’d)
AT-99
Wiring Diagram — AT — TPS
NMAT0221
TAT257
TROUBLE DIAGNOSIS FOR THROTTLE POSI SEN
Wiring Diagram — AT — TPS
AT-100
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