9.6.6. ABS diagnostics

In case of malfunction of system performing diagnostics is possible. Compound ABS units are not subject to adjustment and in case of failure are replaced.

Fig. 7.23. Numbering of conclusions of the EBU ABS socket

Check of electric chains of ABS is made on a shtekerny block of the EBU socket (fig. 7.23).

It is forbidden to connect extenders of test devices (an ohmmeter or the voltmeter) to EBU socket plugs. For this purpose it is necessary to take off a plastic protective cap from a socket block from a supply of electrical wires or to use transitional I will corrode. You watch that numbering of conclusions on a block of wires of the EBU socket coincided with numbering of conclusions of a block of the transitional socket.

Before replacing the hydrounit, EBU or other expensive units, it is recommended to make more careful check of ABS by means of the CONSULT device of Nissan.

For conducting check at the switched-off ignition disconnect a shtekerny block of EBU. All other shtekerny sockets of the ABS system have to be connected. The stoplight switch also should not be disconnected. You make check according to tab. 7.2 and 7.3.

check No.	Connection of the device	Conditions of conducting check	The expected result of measurement	Possible place of malfunction
1	Conclusion "4" sockets of the relay and "weight"	Ignition is switched off	U=Uakk. baht.	Fuse D (30 A) or electrical wiring
2	Conclusion "4" sockets of the relay and "weight"		The same	Fuse C (30 A) or electrical wiring
3	Conclusion of "1" socket of the switch of a stoplight and "weight"		»	Fuse No. 14 (10 A) or electrical wiring
4	Conclusion of "1" EBU and "weight"	Ignition is included	»	Fuse No. 12 (7,5 A) or electrical wiring
5	Conclusion of "30" EBU and "weight"		»	Fuse No. 8 (10 A) or electrical wiring
6	Conclusion "7" sockets of diagnostics and "weight"		»	Fuse No. 7 (7,5 A) or electrical wiring
7	Conclusion "19" sockets of the hydrounit and "weight"		»	Relay of power supply of electromagnetic valves
8	Conclusion of "48" EBU and "weight"	Ignition is switched off, the pedal of a brake is released	U=0	Stoplight switch
9	Conclusions "28", "29" or "39" EBU and "weight"	Ignition is switched off. EBU is connected on "weight" (the rechargeable battery is switched-off)	RЈ0,5 of Ohms	Electrical wiring or point of connection of "weight"

check No.	EBU socket conclusion	The checked sensor	Conditions of conducting check	The expected result of measurement	Possible place of malfunction
2/1	"15" and "14"	Forward right wheel	The switch of ignition or devices and starter is switched off	0,8-1,2 kOhm	Sensor, connections of wires or wire
2/2	"9" and "10"	Forward left wheel
2/3	"11" and "38"	Back right wheel
2/4	"13" and "12"	Back left wheel

Before performing diagnostics be convinced of tightness of the vacuum amplifier, of lack of squeezing of hoses of the brake system and their tightness. Add brake fluid in a system tank to normal level. At operations with shtekerny blocks pay attention to a condition of their conclusions, spring locks and existence of rubber laying.

The scheme of electric chains of the ABS system is provided in a color tab at the end of the book.