Infiniti FX35, FX50 (S51). Manual — part 1863
P0725 ENGINE SPEED
TM-259
< DTC/CIRCUIT DIAGNOSIS >
[7AT: RE7R01B (VK50VE)]
C
E
F
G
H
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J
K
L
M
A
B
TM
N
O
P
P0725 ENGINE SPEED
Description
INFOID:0000000005250239
The engine speed signal is transmitted from the ECM to the TCM with CAN communication line.
DTC Logic
INFOID:0000000005250240
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
CHECK DTC DETECTION
With CONSULT-III
1.
Start the engine.
2.
Select “SLCT LVR POSI” and “VHCL/S SE-A/T” in “Data Monitor” in “TRANSMISSION”.
3.
Drive vehicle and maintain the following conditions for 5 seconds or more.
4.
Perform “Self Diagnostic Results” in “TRANSMISSION”.
Is “P0725” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005250241
1.
CHECK DTC OF ECM
With CONSULT-III
1.
Turn ignition switch ON.
2.
Perform “Self Diagnostic Results” in “ENGINE”.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Check DTC detected item. Refer to
EC-718, "CONSULT-III Function"
2.
CHECK DTC OF TCM
With CONSULT-III
Perform “Self Diagnostic Results” in “TRANSMISSION”.
Is any DTC other than “P0725” detected?
YES
>> GO TO 3.
NO
>> Check DTC detected item. Refer to
TM-243, "CONSULT-III Function (TRANSMISSION)"
.
DTC
Trouble diagnosis name
DTC is detected if...
Possible cause
P0725
Engine Speed Input Circuit
• TCM does not receive the
CAN communication signal
from the ECM.
• The engine speed is more
less 150 rpm even if the vehi-
cle speed is more than 10 km/
h (7 MPH).
Harness or connectors
(ECM to TCM circuit is open or
shorted.)
SLCT LVR POSI
: D
VHCL/S SE-A/T
: More than 10km/h (7 MPH)
TM-260
< DTC/CIRCUIT DIAGNOSIS >
[7AT: RE7R01B (VK50VE)]
P0725 ENGINE SPEED
3.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace A/T assembly. Refer to
NO
>> Repair or replace damaged parts.
P0729 6GR INCORRECT RATIO
TM-261
< DTC/CIRCUIT DIAGNOSIS >
[7AT: RE7R01B (VK50VE)]
C
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H
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M
A
B
TM
N
O
P
P0729 6GR INCORRECT RATIO
Description
INFOID:0000000005250242
This malfunction is detected when the A/T does not shift into 6GR position as instructed by TCM. This is not
only caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control
valve sticking, improper solenoid valve operation, etc.
DTC Logic
INFOID:0000000005250243
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
• “
” must be performed before starting “DTC CONFIRMATION PROCE-
DURE”.
• Never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause
secondary malfunction.
• Always drive vehicle at a safe speed.
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
CHECK ATF TEMPERATURE
With CONSULT-III
1.
Start the engine.
2.
Select “ATF TEMP 1” in “Data Monitor” in “TRANSMISSION”.
3.
Check ATF temperature is in the following range.
With GST
1.
Start the engine.
2.
Drive vehicle for approximately 5 minutes in urban areas.
Is ATF temperature within specified range?
YES
>> GO TO 3.
NO
>> Drive vehicle to warm ATF or stop engine to cool ATF.
3.
CHECK SYMPTOM (PART 1)
With CONSULT-III
1.
Select “6TH GR FNCTN P0729” in “DTC & SRT confirmation” in “TRANSMISSION”.
2.
Drive vehicle with manual mode and maintain the following conditions.
DTC
Trouble diagnosis name
DTC is detected if...
Possible cause
P0729
Gear 6 Incorrect Ratio
The gear ratio is:
• 0.916 or more
• 0.812 or less
• Input clutch solenoid valve
• Direct clutch solenoid valve
• High and low reverse clutch
solenoid valve
• Front brake solenoid valve
• Low brake solenoid valve
• 2346 brake solenoid valve
• Anti-interlock solenoid valve
• Each clutch and brake
• Output speed sensor
• Input speed sensor 1, 2
• Hydraulic control circuit
ATF TEMP 1
: 20
°
C (68
°
F) – 140
°
C (284
°
F)
TM-262
< DTC/CIRCUIT DIAGNOSIS >
[7AT: RE7R01B (VK50VE)]
P0729 6GR INCORRECT RATIO
3.
Keep the current driving status for 2 seconds or more if CONSULT-III screen changes from “OUT OF
CONDITION” to “TESTING”.
CAUTION:
When “TESTING” is not detected on CONSULT-III for a long time, check “Self Diagnostic Results”
in “TRANSMISSION”. When a DTC other than “P0729” is detected, check the DTC. Refer to
.
With GST
1.
Drive vehicle and maintain the following conditions for 2 seconds or more.
2.
Check DTC.
Is “OUT OF CONDITION”, “STOP VEHICLE” or “COMPLETED RESULT NG” displayed? / Is “P0729”
detected?
YES-1 >> “OUT OF CONDITION”: Perform “Step 3” again.
YES-2 >> “STOP VEHICLE”: GO TO 4.
YES-3 >> “COMPLETED RESULT NG”: Go to
YES-4 >> “P0729” is detected: Go to
NO
>> GO TO 4.
4.
CHECK SYMPTOM (PART 2)
1.
Stop vehicle.
2.
Drive vehicle in “D” position allowing it to shift from 1GR to 7GR and check shift timing and shift shock.
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005250244
1.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace A/T assembly. Refer to
NO
>> Repair or replace damaged parts.
GEAR
: 6th
ACCELE POSI
: 0.7/8 or more
VEHICLE SPEED
: 10 km/h (7 MPH) or more
Selector lever
: “M” position
Gear position
: 6th
Accelerator pedal opening
: 0.7/8 or more
Vehicle speed
: 10 km/h (7 MPH) or more
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