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Nissan’s Y61 Patrol sub tank fuel system Operation peration peration peration 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 sub fuel tank control module from: 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 July 2011 V7.0

Sub Tank Fuel System

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Page 1: Sub Tank Fuel System

Nissan’s Y61 Patrol sub tank fuel system

OOOOperationperationperationperation 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 sub fuel tank control module from:

• 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

July 2011

V7.0

Page 2: Sub Tank Fuel System

DiagnosticsDiagnosticsDiagnosticsDiagnostics

The sub tank system is capable of self diagnosis.

• 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. (Self-diagnosis 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].

EEEErasrasrasrasinginginging 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 Description

Fail safe

activation

11 Main fuel tank gauge unit circuit or full switch circuit YES

12

Sub fuel tank gauge unit circuit or empty switch

circuit YES

13 Sub fuel pump power supply circuit YES

14 Sub fuel pump circuit YES

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Page 3: Sub Tank Fuel System

Diagnostics continued

Sub tank control module connector viewSub tank control module connector viewSub tank control module connector viewSub tank control module connector view

10 3 *13

9 8 7 *12

2 14 4 6

*11 5 1

*Pins 11, 12, 13 late production only

Pin data tablePin data tablePin data tablePin data table

Terminal

Wire colour early

production 10 wires

Wire colour late

production 13 wires

Circuit ID late production

13 wires State Voltage

1 White/Black Red PWR IGN ON 12V

2 Green/Blue Green/Blue Sub fuel pump

IGN ON with: • Sub fuel tank

switch is ON • Main fuel tank is

not full • Sub tank is not

empty

12v

3 Green/White Green/white PWR IGN ON or ACC 12v

4 Yellow/Blue Blue/yellow

*Black Empty switch

IGN ON with: • Sub tank is empty

0V

5 Green/Yellow White/blue Sub fuel tank gauge IGN ON 0-4v

6 Green Purple Full switch IGN ON with:

• Main tank is not full

5V

7 Yellow Green Fuel gauge IGN ON 0-2.5v

8 Not used Purple/red

*White/green Engine running Engine running 12v

9 Green/black Green/black Sub fuel tank switch IGN ON 5v

10 Green Blue Indicator IGN ON 12v

11 Not used Black Ground Always 0v

12 Not used Red PWR Constant 12v

13 Not used White/red Sub fuel tank warning lamp

IGN ON with: • Engine not running • Sub tank control

system is in normal state

0v

* TB45S engine models

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Page 4: Sub Tank Fuel System
Page 5: Sub Tank Fuel System

Location of sub tank moduleLocation of sub tank moduleLocation of sub tank moduleLocation of sub tank module

Sub tank control module location (dash cutaway representation)

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