Infiniti Q45 (FY33). Manual - part 38

SAT909I

SAT525I

DIAGNOSTIC PROCEDURE

INSPECTION START

CHECK TCM POWER SOURCE.
1. Turn ignition switch to “ON” position.

(Do not start engine.)

2. Check voltage between TCM terminals

q

4

,

q

9

,

q

23

and ground.

Voltage: Battery voltage

3. Turn ignition switch to “OFF” position.
4. Check voltage between TCM terminal

q

23

and ground.

Voltage: Battery voltage

OK

E

NG

Check the following items:

I

Harness for short or
open between ignition
switch and TCM (Main
harness)

I

10A fuse [No.

28

,

located in the fuse block
(J/B)]

I

Ignition switch
Refer to EL section
(“POWER SUPPLY
ROUTING”).

CHECK A/T FLUID TEMPERATURE
SENSOR WITH TERMINAL CORD
ASSEMBLY.
1. Turn ignition switch to “OFF” position.
2. Disconnect terminal cord assembly con-

nector at the end of A/T assembly.

3. Check resistance between terminals

q

8

and

q

9

when A/T is cold.

Resistance:

Cold [20°C (68°F)]

Approximately 2.5 k

Ω

4. Reinstall any part removed.

OK

E

NG

1. Remove oil pan.
2. Check the following

items:

I

A/T fluid temperature
sensor
Refer to “Component
Inspection”, AT-150.

I

Harness of terminal cord
assembly for short or
open

q

A

(Go to next page.)

GI

MA

EM

LC

EC

FE

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSIS FOR BATT/FLUID TEMP SEN

A/T Fluid Temperature Sensor Circuit and TCM
Power Source (Cont’d)

H

H

H

AT-149

SAT738J

SAT913IA

SAT914I

q

A

CHECK INPUT SIGNAL OF A/T FLUID
TEMPERATURE SENSOR.

1. Start engine.
2. Select “TCM INPUT SIGNALS”

in “DATA MONITOR” mode for
A/T with CONSULT-II.

3. Read out the value of “FLUID

TEMP SE”.
Voltage:
Cold [20°C (68°F)]

→

Hot [80°C (176°F)]:

Approximately
1.5V

→

0.5V

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

1. Start engine.
2. Check voltage between TCM

terminal

q

33

and ground while

warming up A/T.
Voltage:
Cold [20°C (68°F)]

→

Hot [80°C (176°F)]:

Approximately
1.5V

→

0.5V

3. Turn ignition switch to “OFF”

position.

4. Disconnect TCM harness con-

nector.

5. Check resistance between ter-

minal

q

35

and ground.

Continuity should exist.

OK

E

NG

Check the following item:

I

Harness for short or
open between TCM,
ECM and terminal cord
assembly (Main harness)

I

Ground circuit for ECM
Refer to EC section
(“TROUBLE DIAGNOSIS
FOR POWER SUPPLY”).

Perform DIAGNOSTIC TROUBLE CODE
(DTC) CONFIRMATION PROCEDURE,
AT-148.

OK

E

NG

1. Perform TCM input/

output signal inspection.

2. If NG, recheck TCM pin

terminals for damage or
loose connection with
harness connector.

INSPECTION END

SAT527I

COMPONENT INSPECTION

A/T fluid temperature sensor

I

For removal, refer to AT-195.

I

Check resistance between terminals

q

8

and

q

9

while changing

temperature as shown at left.

Temperature °C (°F)

Resistance

20 (68)

Approximately 2.5 k

Ω

80 (176)

Approximately 0.3 k

Ω

TROUBLE DIAGNOSIS FOR BATT/FLUID TEMP SEN

A/T Fluid Temperature Sensor Circuit and TCM
Power Source (Cont’d)

H

H

H

AT-150

SAT568I

Vehicle Speed Sensor

⋅

MTR

DESCRIPTION

The vehicle speed sensor

⋅

MTR is built into the speedometer

assembly. The sensor functions as an auxiliary device to the revo-
lution sensor when it is malfunctioning. The TCM will then use a
signal sent from the vehicle speed sensor

⋅

MTR.

TCM TERMINALS AND REFERENCE VALUE

Remarks: Specification data are reference values.

Terminal

No.

Wire color

Item

Condition

Judgement

standard

(Approx.)

27

P/L

Vehicle speed
sensor

When moving vehicle at 2 to 3 km/h
(1 to 2 MPH) for 1 m (3 ft) or more.

Voltage varies
between less
than 1V and
more than 4.5V

ON BOARD DIAGNOSIS LOGIC

Diagnostic trouble code

Malfunction is detected when ...

Check item (Possible cause)

: VHCL SPEED SEN

⋅

MTR

TCM does not receive the proper volt-
age signal from the sensor.

I

Harness or connectors
(The sensor circuit is open or
shorted.)

I

Vehicle speed sensor

: 2nd judgement flicker

GI

MA

EM

LC

EC

FE

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN

⋅

MTR

AT-151

SAT014K

SAT971J

SAT569I

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMA-
TION PROCEDURE

CAUTION:

I

Always drive vehicle at a safe speed.

I

If conducting this “DTC CONFIRMATION PROCEDURE”
again, always turn ignition switch “OFF” and wait at least
5 seconds before continuing.

After the repair, perform the following procedure to confirm the
malfunction is eliminated.

1)

Turn ignition switch “ON” and select “DATA MONITOR”
mode for “A/T” with CONSULT-II.

2)

Start engine and accelerate vehicle from 0 to 25 km/h (0
to 16 MPH).

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

1)

Start engine.

2)

Drive vehicle under the following conditions:
Selector lever in “D” and vehicle speed higher than 25
km/h (16 MPH).

3)

Perform self-diagnosis.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No
Tools), AT-49.

TROUBLE DIAGNOSIS FOR VHCL SPEED SEN

⋅

MTR

Vehicle Speed Sensor

⋅

MTR (Cont’d)

AT-152