Infiniti Q45. Manual - part 65

MAIN POWER SUPPLY AND GROUND CIRCUIT

AT-173

D

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AT

MAIN POWER SUPPLY AND GROUND CIRCUIT

PFP:00100

Wiring Diagram — AT — MAIN

NCS00104

TCWM0305E

AT-174

MAIN POWER SUPPLY AND GROUND CIRCUIT

TCM terminals and data are reference value. Measured between each terminal and ground.

Diagnostic Procedure

NCS00105

1. 

CHECK TCM POWER SOURCE STEP 1

1.

Turn ignition switch OFF.

2.

Disconnect A/T assembly harness connector.

3.

Check voltage between A/T assembly harness connector termi-
nals and ground.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2. 

CHECK TCM POWER SOURCE STEP 2

1.

Disconnect A/T assembly harness connector.

2.

Turn ignition switch ON. (Do not start engine.)

3.

Check voltage between A/T assembly harness connector termi-
nals and ground.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

Terminal

Wire 

color

Item

Condition

Data (Approx.)

1

W/B

Power supply
(Memory back-up)

Always

Battery voltage

2

W/B

Power supply
(Memory back-up)

Always

Battery voltage

5

B

Ground

Always

0 V

6

G/R

Power supply

–

Battery voltage

–

0 V

10

B

Ground

Always

0 V

Item

Connector

Terminal

Voltage

TCM

F26

1 - Ground

Battery voltage

2 - Ground

6 - Ground

0 V

SCIA2104E

Item

Connector

Terminal

Voltage

TCM

F26

1 - Ground

Battery voltage

2 - Ground

6 - Ground

SCIA2105E

MAIN POWER SUPPLY AND GROUND CIRCUIT

AT-175

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AT

3. 

DETECT MALFUNCTIONING ITEM

Check the following.

●

Harness for short or open between battery and A/T assembly harness connector terminals 1, 2

●

Harness for short or open between ignition switch and A/T assembly harness connector terminal 6

●

10A fuse (No. 75, located in the fuse, fusible link and relay block) and 10A fuse (No. 35, located in the
fuse block No.2). Refer to 

PG-53, "Electrical Units Location"

 .

●

Ignition switch. Refer to 

PG-2, "POWER SUPPLY ROUTING"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4. 

CHECK TCM GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect A/T assembly harness connector.

3.

Check continuity between A/T assembly harness connector ter-
minals and ground.

If OK, check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 5.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

5. 

DETECT MALFUNCTIONING ITEM

Check the following.

●

The A/T assembly harness connector terminals for damage or loose connection with harness connector.

OK or NG

OK

>> GO TO 6.

NG

>> Repair or replace damaged parts.

6. 

PERFORM SELF-DIAGNOSIS

Perform self-diagnosis. Refer to 

AT-87, "SELF-DIAGNOSTIC RESULT MODE"

 .

OK or NG

OK

>> INSPECTION END

NG-1

>> Self-diagnosis does not activate: GO TO 7.

NG-2

>> DTC is displayed: Check the malfunctioning system. Refer to 

AT-87, "SELF-DIAGNOSTIC

RESULT MODE"

 .

Continuity should exist.

SCIA2106E

AT-176

MAIN POWER SUPPLY AND GROUND CIRCUIT

7. 

CHECK TERMINAL CORD ASSEMBLY

1.

Remove control valve with TCM. Refer to 

AT-225, "Control Valve with TCM and A/T Fluid Temperature

Sensor 2"

 .

2.

Disconnect A/T assembly harness connector and TCM connector.

3.

Check continuity between A/T assembly harness connector ter-
minals and TCM connector terminals.

4.

Check continuity between A/T assembly harness connector ter-
minals and TCM connector terminals.

5.

If OK, check harness for short to ground and short to power.

OK or NG

OK

>> Replace the control valve with TCM. Refer to 

AT-225, "Control Valve with TCM and A/T Fluid Tem-

perature Sensor 2"

 .

NG

>> Replace open circuit or short to ground and short to power in harness or connectors.

Item

 Connector

Terminal

Continuity

A/T assembly harness con-
nector

F26

1

Yes

TCM connector 

F502

9

A/T assembly harness con-
nector

F26

2

Yes

TCM connector 

F502

10

A/T assembly harness con-
nector

F26

6

Yes

TCM connector 

F502

4

SCIA5464E

Item

 Connector

Terminal

Continuity

A/T assembly harness con-
nector

F26

5

Yes

TCM connector 

F504

21

A/T assembly harness con-
nector

F26

10

Yes

TCM connector 

F504

22

SCIA5465E