Infiniti G20 (P11). Manual — part 32
Wiring Diagram — AT — ENGSS
NCAT0202
TAT226
GI
MA
EM
LC
EC
FE
CL
MT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0725 ENGINE SPEED SIGNAL
Wiring Diagram — AT — ENGSS
AT-125
Diagnostic Procedure
NCAT0042
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-590, “DTC P1320 IGNITION
SIGNAL”.
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.
SAT014K
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 and ignition coil
Refer to EC-590, “DTC P1320 IGNITION SIGNAL”.
DTC P0725 ENGINE SPEED SIGNAL
Diagnostic Procedure
AT-126
3
CHECK INPUT SIGNAL (Without CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM terminal 39 and ground.
Voltage (Idle speed):
Refer to EC-632, “Idle Speed and Ignition Timing”.
SAT424J
OK or NG
OK
©
GO TO 4.
NG
©
Check the following items:
I
Harness for short or open between TCM and ECM
I
Resistor and ignition coil
Refer to EC-590, “DTC P1320 IGNITION SIGNAL”.
4
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-124.
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
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0725 ENGINE SPEED SIGNAL
Diagnostic Procedure (Cont’d)
AT-127
Description
NCAT0043
I
This is an OBD-II self-diagnostic item and not available in TCM
self-diagnosis.
I
This malfunction will not be detected while the O/D OFF indi-
cator lamp is indicating another self-diagnosis malfunction.
I
This malfunction is detected when the A/T does not shift into
first gear position as instructed by the TCM. This is not caused
by electrical malfunction (circuits open or shorted) but by
mechanical malfunction such as control valve sticking,
improper solenoid valve operation, etc.
Gear position
1
2
3
4
Shift solenoid valve A
ON (Closed)
OFF (Open)
OFF (Open)
ON (Closed)
Shift solenoid valve B
ON (Closed)
ON (Closed)
OFF (Open)
OFF (Open)
TCM TERMINALS AND REFERENCE VALUE
NCAT0043S01
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement stan-
dard
(Approx.)
11
L/W
Shift solenoid
valve A
When shift solenoid valve A oper-
ates.
(When driving in “D
1
” or “D
4
”.)
Battery voltage
When shift solenoid valve A does
not operate.
(When driving in “D
2
” or “D
3
”.)
0V
12
L/Y
Shift solenoid
valve B
When shift solenoid valve B oper-
ates.
(When driving in “D
1
” or “D
2
”.)
Battery voltage
When shift solenoid valve B does
not operate.
(When driving in “D
3
” or “D
4
”.)
0V
ON BOARD DIAGNOSTIC LOGIC
NCAT0043S02
This diagnosis monitors actual gear position by checking the torque
converter slip ratio calculated by TCM as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (1st) supposed
by TCM, the slip ratio will be more than normal. In case the ratio
exceeds the specified value, TCM judges this diagnosis malfunc-
tion.
This malfunction will be caused when either shift solenoid valve A
is stuck open or shift solenoid valve B is stuck open.
Gear position supposed by TCM
1
2
3
4
In case of gear position with no malfunctions
1
2
3
4
In case of gear position with shift solenoid valve A stuck open
2*
2
3
3
In case of gear position with shift solenoid valve B stuck open
4*
3
3
4
*: P0731 is detected.
DTC P0731 A/T 1ST GEAR FUNCTION
Description
AT-128
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