Infiniti Q45 (FY33). Manual — part 26

SAT014K

SAT971J

SAT021J

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMA-
TION PROCEDURE

CAUTION:

I

Always drive vehicle at a safe speed.

I

Be careful not to rev engine into the red zone on the
tachometer.

NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
TESTING CONDITION:
Always drive vehicle on a level road to improve the accuracy
of test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.

1)

Start engine and select “DATA MONITOR” mode for
“A/T” with CONSULT-II.

2)

Make sure that output voltage of A/T fluid temperature
sensor is within the range below.
FLUID TEMP SEN: 0.4 - 1.5V
If out of range, drive the vehicle to decrease the voltage
(warm up the fluid) or stop engine to increase the volt-
age (cool down the fluid).

3)

Select “2ND GR FNCTN P0732” of “DTC WORK SUP-
PORT” mode for “A/T” with CONSULT-II and touch
“START”.

4)

Accelerate vehicle to 70 to 75 km/h (43 to 47 MPH)
under the following condition and release the accelera-
tor pedal completely.
THROTTLE POSI: Less than 1.0/8 (at all times during
step 4)
Selector lever: D position (OD “ON”)

I

Check that “GEAR” shows “3” or “4” after releasing
pedal.

5)

Depress accelerator pedal to WOT (more than 7.0/8 of
“THROTTLE POSI”) quickly from a speed of 70 to 75
km/h (43 to 47 MPH) until “TESTING” changes to “STOP
VEHICLE” or “COMPLETED”. (It will take approximately
3 seconds.)
If the check result NG appears on CONSULT-II screen,
go to “DIAGNOSTIC PROCEDURE”, AT-103.
If “STOP VEHICLE” appears on CONSULT-II screen, go
to following step.

I

Check that “GEAR” shows “2” when depressing
accelerator pedal to WOT.

I

If “TESTING” does not appear on CONSULT-II for a
long

time,

select

“SELF-DIAG

RESULTS”

for

“ENGINE”. In case a 1st trip DTC other than P0732
is shown, refer to applicable “TROUBLE DIAGNOSIS
FOR DTC”.

6)

Stop vehicle.

7)

Follow the instruction displayed. (Check for normal shift-
ing referring to the table below.)

Vehicle condition

Gear on actual transmission shift pattern when

screen is changed to 1

,

2

,

3

,

4

No malfunction exists

1

,

2

,

3

,

4

Malfunction for P0732 exists.

4

,

3

,

3

,

4

GI

MA

EM

LC

EC

FE

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSIS FOR DTC P0732

A/T 2nd Gear Function (Cont’d)

AT-101

8)

Make sure that “OK” is displayed. (If “NG” is displayed,
refer to “DIAGNOSTIC PROCEDURE”.)
Refer to “DIAGNOSTIC PROCEDURE”, AT-103.
Refer to shift schedule, AT-276.

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Follow the procedure “With CONSULT-II”.

TROUBLE DIAGNOSIS FOR DTC P0732

A/T 2nd Gear Function (Cont’d)

AT-102

SAT534I

SAT367H

DIAGNOSTIC PROCEDURE

INSPECTION START

CHECK SHIFT SOLENOID VALVE.
1. Remove control valve assembly. Refer

to AT-195.

2. Check shift solenoid valve operation.

I

Shift solenoid valve B

Refer to “Component Inspection” below.

OK

E

NG

Repair or replace shift sole-
noid valve assembly.

CHECK CONTROL VALVE.
1. Disassemble control valve assembly.

Refer to “Control Valve Assembly”, AT-
221.

2. Check to ensure that:

I

Valve, sleeve and plug slide along
valve bore under their own weight.

I

Valve, sleeve and plug are free from
burrs, dents and scratches.

I

Control valve springs are free from
damage, deformation and fatigue.

I

Hydraulic line is free from obstacles.

OK

E

NG

Repair control valve assem-
bly.

Perform DIAGNOSTIC TROUBLE CODE
(DTC) CONFIRMATION PROCEDURE,
AT-101.

OK

E

NG

Check control valve again.
Repair or replace control
valve assembly.

INSPECTION END

SAT535I

COMPONENT INSPECTION

Shift solenoid valve B

I

For removal, refer to AT-195.

Resistance check

I

Check resistance between two terminals.

Solenoid valve

Terminal No.

Resistance

(Approx.)

Shift solenoid
valve B

q

2

Ground

20 - 40

Ω

SAT534I

Operation check

I

Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal and ground.

GI

MA

EM

LC

EC

FE

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSIS FOR DTC P0732

A/T 2nd Gear Function (Cont’d)

H

H

H

H

AT-103

A/T 3rd Gear Function

DESCRIPTION

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 indicator lamp is indicating another self-diagno-
sis malfunction.

I

This malfunction is detected when the A/T does not shift into third 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, malfunctioning servo piston or brake band,
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

Remarks: Specification data are reference values.

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

6

R/Y

Shift solenoid
valve A

When shift solenoid valve A oper-
ates.
(When driving in “D

1

” or “D

4

”.)

Battery voltage

When shift solenoid valve A does not
operate.
(When driving in “D

2

” or “D

3

”.)

0V

ON BOARD DIAGNOSTIC LOGIC

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 (3rd) supposed by TCM, the slip ratio will be more than
normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when shift solenoid valve A is stuck closed.

Gear position supposed by TCM

1

2

3

4

In case of gear position with no malfunc-
tions

1

2

3

4

In case of gear position with shift solenoid
valve A stuck closed

1

1

q

4

4

q

: P0733 is detected.

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: A/T 3RD GR FNCTN

A/T cannot be shifted to the 3rd gear
position even if electrical circuit is good.

I

Shift solenoid valve A

I

Each clutch

I

Hydraulic control circuit

: P0733

TROUBLE DIAGNOSIS FOR DTC P0733

AT-104