Infiniti M45 (Y34). Manual — part 59
DTC P0725 ENGINE SPEED SIGNAL
AT-121
D
E
F
G
H
I
J
K
L
M
A
B
AT
DTC P0725 ENGINE SPEED SIGNAL
PFP:24825
Description
ACS001AU
The engine speed signal is sent from the ECM to the TCM.
CONSULT-II Reference Value
ACS004P2
On Board Diagnosis Logic
ACS001AV
●
This is not an OBD-II self-diagnostic item.
●
Diagnostic trouble code “ENGINE SPEED SIG” with CONSULT-II or 16th judgement flicker without CON-
SULT-II is detected when TCM does not receive the ignition signal from ECM during engine cranking or
running.
Possible Cause
ACS001AW
Harness or connectors
(The ECM to the TCM circuit is open or shorted.)
DTC Confirmation Procedure
ACS001AX
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch ON and select “DATA MONITOR” mode for
“A/T” with CONSULT-II.
2.
Start engine and maintain the following conditions for at least 10
consecutive seconds.
VHCL SPEED SE: 10 km/h (6 MPH) or more
ACCELE POSI: More than 1/8
Selector lever: “D” position
3.
AT-122, "Diagnostic Procedure"
Item name
Condition
Display value
ENGINE SPEED
Engine running
Closely matches the tachometer reading.
SAT014K
AT-122
DTC P0725 ENGINE SPEED SIGNAL
Diagnostic Procedure
ACS001AY
1.
CHECK DTC WITH ECM
With CONSULT-II
1.
Turn ignition switch to ON position. (Do not start engine.)
2.
Select “SELF-DIAG RESULTS” mode for “ENGINE” with CON-
SULT-II. Refer to
EC-108, "CONSULT-II Function (ENGINE)"
OK or NG
OK
>> GO TO 2.
NG
>> Check the DTC detected item, go to
●
If CAN communication line is detected, go to
"DTC U1000 CAN COMMUNICATION LINE"
.
2.
CHECK DTC WITH TCM
With CONSULT-II
1.
Start engine.
2.
Select “MAIN 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
.
3.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-121, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 4.
4.
CHECK TCM
1.
Check TCM input/output signal. Refer to
AT-86, "TCM Input/Output Signal Reference Values"
.
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.
SAT014K
PCIA0041E
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-123
D
E
F
G
H
I
J
K
L
M
A
B
AT
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
PFP:31940
Description
ACS0047K
●
The torque converter clutch solenoid valve is activated, with the gear in D
3
, D
4
, D
5
, M
4
and M
5
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
ACS0047L
On Board Diagnosis Logic
ACS0047M
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “TCC SOLENOID/CIRC” with CONSULT-II or P0740 without 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
ACS0047N
●
Torque converter clutch solenoid valve
●
Harness or connectors
(The solenoid circuit is open or shorted.)
DTC Confirmation Procedure
ACS0047O
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1.
Turn ignition switch ON. (Do not start engine.)
2.
Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3.
Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL SPEED SE: 80 km/h (50 MPH) or more
ACCELE POS: 0.5/8 - 1.0/8
SELECTOR LEVER: “D” position
4.
If DTC is detected go to
AT-125, "Diagnostic Procedure"
WITH GST
Follow the procedure “With CONSULT-II”.
Item name
Condition
Display value (Approx.)
TCC SOLENOID
When perform slip lock-up
0.2 - 0.4A
When perform lock-up
0.4 - 0.6A
SAT014K
AT-124
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Wiring Diagram — AT — TCV
ACS0047P
TCWA0113E
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