Sub Tank Fuel System

V7.0

Jul 2011

Nissan’s Y61 Patrol sub tank fuel system

Operation Operation Nissan’s sub tank fuel system, utilized in the Y61 range of Patrol’s, controls the sub fuel pump’s operation using three inputs in determining the operation of the sub fuel tank pump. These inputs are received to the t he sub fuel tank control module from: •

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Main fuel tank full switch - built into the main tank gauge unit. When the predetermined level is

exceeded, the full switch operates to stop sub fuel pump operation, preventing excess fuel from flowing into the main fuel tank. Sub fuel tank empty switch - built into the sub tank gauge unit. It senses the sub fuel tank fuel level. When fuel in the sub fuel tank drops below the predetermined level, the empty switch operates to stop sub fuel pump operation. If, after 1 hour of sub tank fuel pump operation, conditions are not met from either of the tank level switches, the sub fuel pump automatically stops. This provides a safety feature of the system. Dash mounted sub fuel tank switch - driver activated control. Next page © Copyright Autodata Australia Pty Ltd

Diagnostics The sub tank system is capable of self diagnosis. •

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After turning the ignition switch ON, turn the sub fuel tank switch ON and OFF more than 5 times. Make sure the sub tank indicator light in the instrument cluster flashes every 2 seconds. (Selfdiagnosis will then be activated.) Wait at least 10 seconds, and then start the engine. After engine start, the sub tank indicator light in the instrument cluster will flash a trouble code. Refer to the trouble code chart below. If the system is in fail safe mode, the light will flash 4 times per second as an indication at the beginning of each group of codes. Each trouble code consists of two groups of flashes. First group indicates the 'tens' of the trouble code [A]. Second group indicates the 'units' of the trouble code [C]. A 2.0 second flash indicates the start of the code group [D]. A long pause separates each trouble code [B].

Erasing rasing The trouble code/s retained in the sub fuel tank control module memory, by removing the battery earth terminal. Recheck the codes are clear by activating the self diagnosis and confirm codes are clear. (After starting the engine, the sub tank lamp will flash at one second intervals). Exit self diagnosis (turn off IGN).Check to ensure that sub tank warning lamp remains off. Flash code 11

Fail safe activation

Description

12

Main fuel tank gauge unit circuit or full switch circuit Sub fuel tank gauge unit circuit or empty switch circuit

YES YES

13

Sub fuel pump power supply circuit

YES

14

Sub fuel pump circuit

YES

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Diagnostics continued Sub tank control module connector view 10

3

*13

2

14

4

9 6

8

7

*12

*11

5

1

*Pins 11, 12, 13 late production only Pin data table

Terminal 1

Wire colour early production 10 wires White/Black

Wire colour late production 13 wires Red

Circuit ID late production 13 wires PWR

State IGN ON IGN ON with: Sub fuel tank switch is ON Main fuel tank is not full Sub tank is not empty IGN ON or ACC IGN ON with: Sub tank is empty IGN ON IGN ON with: Main tank is not full IGN ON

Voltage 12V

•

2

Green/Blue

Green/Blue

Sub fuel pump

•

12v

•

3

Green/White

4

Yellow/Blue

5

Green/Yellow

Green/white Blue/yellow *Black White/blue

PWR

6

Green

Purple

Full switch

7

Yellow

Fuel gauge

8

Not used

9 10 11 12

Green/black Green Not used Not used

Green Purple/red *White/green Green/black Blue Black Red

13

Not used

White/red

Empty switch Sub fuel tank gauge

Engine running Sub fuel tank switch Indicator Ground PWR Sub fuel tank warning lamp

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•

Engine running IGN ON IGN ON Always Constant IGN ON with: Engine not running Sub tank control system is in normal state

12v 0V 0-4v 5V 0-2.5v 12v 5v 12v 0v 12v

• •

0v

* TB45S engine models Next page © Copyright Autodata Australia Pty Ltd

Location of sub tank module

Sub tank control module location (dash cutaway representation ) Don’t forget the upcoming webinar dates!

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