Infiniti M35/M45 Y50. Manual — part 50
DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)
AT-123
D
E
F
G
H
I
J
K
L
M
A
B
AT
4.
CHECK SUB-HARNESS
1.
Remove control valve with TCM. Refer to
AT-236, "Control Valve With TCM and A/T Fluid Temperature
.
2.
Disconnect park/neutral position switch connector and TCM connector.
3.
Check continuity between park/neutral position switch connector
terminals and TCM connector terminals.
4.
If OK, check harness for short to ground and short to power.
5.
Reinstall any part removed.
OK or NG
OK
>> GO TO 5.
NG
>> Replace open circuit or short to ground and short to power in harness or connectors.
5.
REPLACE THE REVOLUTION SENSOR AND CHECK DTC
1.
Replace the revolution sensor. Refer to
AT-263, "Revolution Sensor Components (2WD Models Only)"
(2WD models) or
,
(AWD models).
2.
Perform “DTC Confirmation Procedure”. Refer to
AT-119, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> Replace the control valve with TCM. Refer to
AT-236, "Control Valve With TCM and A/T Fluid
6.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-119, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
Item
Connector
Terminal
Continuity
Park/neutral position switch
connector
F505
8
Yes
TCM connector
F503
20
Park/neutral position switch
connector
F505
9
Yes
TCM connector
F503
17
Park/neutral position switch
connector
F505
10
Yes
TCM connector
F503
16
SCIA5458E
AT-124
DTC P0725 ENGINE SPEED SIGNAL
DTC P0725 ENGINE SPEED SIGNAL
PFP:24825
Description
NCS001LL
The engine speed signal is sent from the ECM to the TCM.
CONSULT-II Reference Value
NCS001LM
On Board Diagnosis Logic
NCS001LN
●
This is an OBD-II self-diagnostic item. (For VQ35DE engine)
●
Diagnostic trouble code “P0725 ENGINE SPEED SIG” with CONSULT-II or 16th judgement flicker without
CONSULT-II is detected when TCM does not receive the ignition signal from ECM during engine cranking
or running.
Possible Cause
NCS001LO
Harness or connectors
(ECM to TCM circuit is open or shorted.)
DTC Confirmation Procedure
NCS001LP
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II and check monitor “VHCL/S SE-A/T”,
“ACCELE POSI” and “SLCT LVR POSI ”.
3.
Touch “START”.
4.
Start engine and maintain the following conditions for at least 10
consecutive seconds.
VHCL/S SE-A/T: 10 km/h (6 MPH) or more
ACCELE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
5.
If DTC is detected, go to
AT-125, "Diagnostic Procedure"
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name
Condition
Display value
ENGINE SPEED
Engine running
Closely matches the tachometer reading.
BCIA0030E
DTC P0725 ENGINE SPEED SIGNAL
AT-125
D
E
F
G
H
I
J
K
L
M
A
B
AT
Diagnostic Procedure
NCS001LQ
1.
CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to
AT-92, "SELF-DIAGNOSTIC RESULT MODE"
Is a malfunction in the CAN communication indicated in the results?
YES
>> Check CAN communication line. Refer to
AT-105, "DTC U1000 CAN COMMUNICATION LINE"
.
NO
>> GO TO 2.
2.
CHECK INPUT SIGNAL
With CONSULT-II
1.
Start engine.
2.
Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“A/T” with CONSULT-II.
3.
While monitoring engine speed, check for engine speed change
corresponding to wide-open throttle position signal.
OK or NG
OK
>> GO TO 3.
NG
>> Check the ignition signal circuit. Refer to
(for VQ35DE engine),
(for VK45DE engine).
3.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-124, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 4.
4.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
AT-180, "MAIN POWER SUPPLY AND GROUND CIR-
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace damaged parts.
5.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-236, "Control Valve With TCM and A/T Fluid
NG
>> Repair or replace damaged parts.
Item name
Condition
Display value
ENGINE SPEED
Engine running
Closely matches the
tachometer reading.
PCIA0041E
AT-126
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
PFP:31940
Description
NCS001LR
●
The torque converter clutch solenoid valve is activated, with the gear in D
3
, D
4
, D
5
, M4 and M5 by the
TCM in response to signals sent from the vehicle speed sensor and accelerator pedal position sensor
(throttle position sensor). Torque converter clutch piston operation will then be controlled.
●
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
●
When the accelerator pedal is depressed (less than 1/8) 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
NCS001LS
On Board Diagnosis Logic
NCS001LT
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “P0740 TCC SOLENOID/CIRC” with CONSULT-II or 3rd judgement flicker with-
out CONSULT-II is detected under the following conditions.
–
When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
–
When TCM detects as irregular by comparing target value with monitor value.
Possible Cause
NCS001LU
●
Torque converter clutch solenoid valve
●
Harness or connectors
(Solenoid circuit is open or shorted.)
DTC Confirmation Procedure
NCS001LV
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II and check monitor “VHCL/S SE-A/T”,
“ACCELE POSI” and “SLCT LVR POSI ”. .
3.
Touch “START”.
4.
Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL/S SE-A/T: 80 km/h (50 MPH) or more
ACCELE POSI: 0.5/8 - 1.0/8
SLCT LVR POSI: “D” position
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
5.
AT-127, "Diagnostic Procedure"
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name
Condition
Display value (Approx.)
TCC SOLENOID
Lock-up is active
0.4 - 0.6 A
BCIA0030E
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