Infiniti M45 (Y34). Manual - part 59

 

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Infiniti M45 (Y34). Manual - part 59

 

 

DTC P0725 ENGINE SPEED SIGNAL

AT-121

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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.

If DTC is detected, go to 

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 

EC-108, "CON-

SULT-II Function (ENGINE)"

 .

If CAN communication line is detected, go to 

AT-103,

"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 

EC-649, "IGNITION SIGNAL"

 .

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

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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

 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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