Infiniti QX4 (R50). Manual — part 30
Wiring Diagram — AT — ENGSS
NBAT0189
MAT911A
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0725 ENGINE SPEED SIGNAL
Wiring Diagram — AT — ENGSS
AT-117
Diagnostic Procedure
NBAT0038
1
CHECK DTC WITH ECM
I
Check P code with CONSULT-II.
Turn ignition switch “ON” and select “SELF-DIAG RESULTS” mode for “ENGINE” with CONSULT-II.
Refer to EC-74, “DESCRIPTION”.
OK or NG
OK (With CONSULT-II)
©
GO TO 2.
OK (Without CONSULT-
II)
©
GO TO 4.
NG
©
Check ignition signal circuit for engine control. Refer to EC-499, “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
Refer to EC-127, “ECM INSPECTION TABLE”.
Yes
©
GO TO 5.
No
©
GO TO 3.
3
DETECT MALFUNCTIONING ITEM
Check the following items:
I
Harness for short or open between TCM and ECM
I
Resistor
I
Ignition coil
Refer to EC-499, “Component Description”.
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace damaged parts.
DTC P0725 ENGINE SPEED SIGNAL
Diagnostic Procedure
AT-118
4
CHECK INPUT SIGNAL (WITHOUT CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM terminal 39 and ground.
SAT520J
Refer to EC-127, “ECM INSPECTION TABLE”.
Yes
©
GO TO 4.
No
©
GO TO 3.
5
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-116.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 6.
6
CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
©
INSPECTION END
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0725 ENGINE SPEED SIGNAL
Diagnostic Procedure (Cont’d)
AT-119
Description
NBAT0039
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
NBAT0039S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
11
L/W
Shift solenoid
valve A
When shift solenoid valve A operates.
(When driving in “D
1
” or “D
4
”.)
Battery volt-
age
When shift solenoid valve A does not operate.
(When driving in “D
2
” or “D
3
”.)
0V
12
L/R
Shift solenoid
valve B
When shift solenoid valve B operates.
(When driving in “D
1
” or “D
2
”.)
Battery volt-
age
When shift solenoid valve B does not operate.
(When driving in “D
3
” or “D
4
”.)
0V
ON BOARD DIAGNOSIS LOGIC
NBAT0039S03
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.
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: A/T 1ST GR FNCTN
A/T cannot be shifted to the 1st gear
position even if electrical circuit is good.
I
Shift solenoid valve A
I
Shift solenoid valve B
I
Each clutch
I
Hydraulic control circuit
: P0731
DTC P0731 IMPROPER SHIFTING TO 1ST GEAR POSITION
Description
AT-120
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