ESP and SPS test of electrical system ESP hydraulic unit

AD42.45-P-6001-21C

ESP and SPS test of electrical system ESP hydraulic unit

Precharge and switchover solenoid valves (A7/3y16-y19)





Scope of test

Measuring instrument/
Test connection

Operation/Requirement

Specified value

 Possible cause/Remedy

1.0

 

–

   

ESP hydraulic unit (A7/3)

Solenoid valves

(A7/3y16-y19)



Raise vehicle

Actuate all solenoid valves one after the other:

 and brake operated

 and brake operated



Wheel unbraked



Wheel braked

 Cables

 Depending on solenoid valve actuated:

 1.1 to  1.4

1.1

 

Front axle precharge solenoid valve (A7/3y16)

Internal resistance

80 

(2.46)

N47-5





61

(2.27)

Ignition: OFF

Disconnect ESP control module (N47-5)

2.8-6.6 Ω

 Cables

 ESP hydraulic unit (A7/3)

1.2

 

Rear axle precharge solenoid valve (A7/3y17)

Internal resistance

80 

(2.46)

N47-5





63

(2.29)

Ignition: OFF

Remove ESP control module (N47-5)

2.8-6.6 Ω

 Cables

 ESP hydraulic unit (A7/3)

1.3

   

Front axle switchover solenoid valve (A7/3y18)

Internal resistance

80 

(2.46)

N47-5





 60

(2.26)

Ignition: OFF

Disconnect ESP control module (N47-5)

5.4-12.6 Ω

 Cables

 ESP hydraulic unit (A7/3)

1.4

   

Rear axle switchover solenoid valve (A7/3y19)

Internal resistance

80 

(2.46)

N47-5





 62

(2.28)

Ignition: OFF

Disconnect ESP control module (N47-5)

5.4-12.6 Ω

 Cables

 ESP hydraulic unit (A7/3)