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Test Box VAG 1598/20, Connecting for Wiring Test

-- Switch ignition off.

-- Remove ABS control module -J104- ABS CONTROL MODULE, BOSCH 5, FROM MY 96 .

-- Disconnect harness connector from ABS control module -J104-.

-- Connect test box : VAG1598/20  to ABS control module harness connector (vehicle wiring harness).

Switch to voltage measuring range 200 Ω
Test step : VAG1598/20  sockets Test of
  • Test conditions
-- Additional operations		 Specified value Repairing malfunction
1 5 + 33
  • Left front ABS inlet valve -N101-
  • Left front ABS outlet valve -N102-
  • Wiring between ABS control module and ABS hydraulic unit OK
 9 Ω - 22 Ω -- Check wiring between ABS control module and ABS hydraulic unit for short circuit to Ground (GND) or positive => Wiring Diagram -- If the wiring harness is OK, replace the ABS hydraulic unit
2 54 + 26
  • Right front ABS inlet valve -N99-
  • Right front ABS outlet valve -N100-
      
3 53 + 25
  • Left rear ABS inlet valve -N134-
  • Left rear ABS outlet valve -N136-
      
4 6 + 34
  • Right rear ABS inlet valve -N133-
  • Right rear ABS outlet valve -N135-
      
5 3 + 55
  • Left front switch-over valve -N168-
  • Right front switchover valve -N166-
  • Wiring between ABS control module and ABS hydraulic unit OK
 12 Ω - 28 Ω  
           
Switch to voltage measuring range 200 Ω
Test step : VAG1598/20  sockets Test of
  • Test conditions
-- Additional operations		 Specified value Repairing malfunction
6 4 + 27
  • Left front outlet valve -N169-
  • Right front outlet valve -N167-
  • Wiring between ABS control module and ABS hydraulic unit OK
 12 Ω - 28 Ω -- Test electric wiring between ABS control module and ABS hydraulic unit for short circuit to Ground (GND) or positive => Wiring Diagram -- If the wiring harness is OK, replace the ABS hydraulic unit
7 35 + 10 Left front ABS wheel speed sensor -G47-
  • Wiring between ABS control module and ABS hydraulic unit OK
 400 Ω - 2300 Ω -- Test electric wiring between ABS control module and ABS hydraulic unit for short circuit to Ground (GND) or positive => Wiring Diagram -- If the wiring harness is OK, replace the corresponding ABS wheel speed sensor
8 15 + 14 Right front ABS wheel speed sensor -G45-      
9 13 + 12 Left rear ABS wheel speed sensor -G46-      
10 11 + 38 Right rear ABS wheel speed sensor -G44-      
Switch to voltage measuring range 200 Ω
Test step : VAG1598/20  sockets Test of
  • Test conditions
-- Additional operations		 Specified value Repairing malfunction
11 2 + 37 ABS solenoid valve relay -J106-
  • Wiring between ABS control module and ABS hydraulic unit OK
 30 Ω - 80 Ω -- Test electric wiring between ABS control module and ABS hydraulic unit for short circuit to Ground (GND) or positive => Wiring Diagram -- If the wiring harness is OK, replace the relay
12 2 + 7 ABS return flow pump relay -J105-
  • Wiring between ABS control module and ABS hydraulic unit OK
 30 Ω - 80 Ω  
Test of operation and correct connections
Test step : VAG1598/20  sockets Test of
  • Test conditions
-- Additional operations		 Specification Repairing malfunction
13 (1) Bridge 1 + 2, 28 + 37 Left front ABS inlet valve -N101- and brake line connection
  • Ignition on
-- Bridge sockets 5 + 28		    
      -- Depress brake pedal and hold
  • Left front wheel can be turned by hand
 -- If wheel locks, check whether another wheel can be turned. If yes, the hydraulic brake lines are improperly connected. Check the brake line connections and unions. Make sure that the system operates properly. Repeat test step 13-- If all wheels lock, there is a malfunction of the inlet valve DTC TABLE , Diagnostic Trouble Code (DTC) table, DTC 00257
      -- Remove bridge
  • Left front wheel locks
  
      -- Release brake pedal    
 
(1) A second technician is required to conduct this test.
Test of operation and correct connections
Test step : VAG1598/20  sockets Test of
  • Test conditions
-- Additional operations		 Specification Repairing malfunction
14 (1) Bridge 1 + 2, 28 + 37 Right front ABS inlet valve -N100- and brake line connection
  • Ignition on
-- Bridge sockets 54 + 28		    
      -- Depress brake pedal and hold
  • Right front wheel can be turned by hand
 -- If wheel locks, check whether another wheel can be turned. If yes, the hydraulic brake lines are improperly connected. Check the brake line connections and unions. Make sure that the system operates properly. Repeat test step 14-- If all wheels lock, there is a malfunction of the inlet valve DTC TABLE , Diagnostic Trouble Code (DTC) table, DTC 00259
      -- Remove bridge
  • Right front wheel locks
  
      -- Release brake pedal    
 
(1) A second technician is required to conduct this test.
Test of operation and correct connections
Test step : VAG1598/20  sockets Test of
  • Test conditions
-- Additional operations		 Specification Repairing malfunction
15 (1) Bridge 1 + 2, 28 + 37 Left rear ABS inlet valve -N134- and brake line connection
  • Ignition on
-- Bridge sockets 53 + 28		    
      -- Depress brake pedal and hold
  • Left rear wheel can be turned by hand
 -- If wheel locks, check whether another wheel can be turned. If yes, the hydraulic brake lines are improperly connected. Check the brake line connections and unions. Make sure that the system operates properly. Repeat test step 15-- If all wheels lock, there is a malfunction of the inlet valve DTC TABLE , Diagnostic Trouble Code (DTC) table, DTC 00274
      -- Remove bridge
  • Left rear wheel locks
  
      -- Release brake pedal    
 
(1) A second technician is required to conduct this test.
Test of operation and correct connections
Test step : VAG1598/20  sockets Test of
  • Test conditions
-- Additional operations		 Specification Repairing malfunction
16 (1) Bridge 1 + 2, 28 + 37 Right rear ABS inlet valve -N133- and brake line connection
  • Ignition on
-- Bridge sockets 6 + 28		    
      -- Depress brake pedal and hold
  • Right rear wheel can be turned by hand
 -- If wheel locks, check whether another wheel can be turned. If yes, the hydraulic brake lines are improperly connected. Check the brake line connections and unions. Make sure that the system operates properly. Repeat test step 16-- If all wheels lock, there is a malfunction of the inlet valve DTC TABLE , Diagnostic Trouble Code (DTC) table, DTC 00273
      -- Remove bridge
  • Right rear wheel locks
  
      -- Release brake pedal    
 
(1) A second technician is required to conduct this test.
Switch to voltage measuring range 200 Ω
Test step : VAG1598/20  sockets Test of
  • Test conditions
-- Additional operations		 Specification Repairing malfunction
17 Bridge 1 + 2, 7 + 37, 37 + 28
  • ABS return flow pump -V39-
  • Left front switch-over valve -N168-
  • Left front outlet valve -N169-
  • Pressure limiting valve in ABS hydraulic unit -N55-
  • Left front ABS outlet valve -N102-
  • Right rear ABS outlet valve -N135-
 -- Connect pressure gauge : VAG1310A  to left front brake caliper and bleed BRAKE FLUID, BLEEDING -- Bridge sockets 3 + 28   -- Return flow pump faulty, replace ABS hydraulic unit -N55- ABS HYDRAULIC UNIT OVERVIEW -- Test switch-over valve -N168- and outlet valve -N169- with resistance measurement test steps 5 and 6. If faulty, replace ABS hydraulic unit -N55- -- Pressure limiting valve and/or left front ABS outlet valve -N102- and/or right rear outlet valve -N135- faulty, replace ABS hydraulic unit -N55- -
      -- Switch ignition on, then after not more than 10 seconds switch ignition off
  • Switch-over valve -N168- operates
  • ABS return flow pump -V39- runs
  • Gauge pressure max. 5 bar
  
      -- Bridge sockets 4 + 28-- Switch ignition on, then after not more than 10 seconds switch ignition off
  • Outlet valve -N169- operates
  • Gauge pressure increases: AWD: 90 ± 25 bar
  
      -- Disconnect pressure gauge : VAG1310A  and bleed brakes BRAKE FLUID, BLEEDING    
Switch to voltage measuring range 200 Ω
Test step : VAG1598/20  sockets Test of
  • Test conditions
-- Additional operations		 Specification Repairing malfunction
18 Bridge 1 + 2, 7 + 37, 37 + 28
  • ABS return flow pump -V39-
  • Right front switch-over valve -N166-
  • Right front outlet valve -N167-
  • Pressure limiting valve in ABS hydraulic unit -N55-
  • Right front ABS outlet valve -N100-
  • Left rear ABS outlet valve -N136-
 -- Connect pressure gauge : VAG1310A  to right front brake caliper and bleed BRAKE FLUID, BLEEDING -- Bridge sockets 55 + 28   -- Return flow pump faulty, replace ABS hydraulic unit -N55- ABS HYDRAULIC UNIT OVERVIEW -- Test switch-over valve -N166- and outlet valve -N167- with resistance measurement test steps 5 and 6. If faulty, replace ABS hydraulic unit -N55- -- Pressure limiting valve and/or right front ABS outlet valve -N100- and/or left rear outlet valve -N136- faulty, replace ABS hydraulic unit -N55-
      -- Switch ignition on, then after not more than 10 seconds switch ignition off
  • Switch-over valve -N166- operates
  • ABS return flow pump -V39- runs
  • Gauge pressure max. 5 bar
  
      -- Bridge sockets 27 + 28-- Switch ignition on, then after not more than 10 seconds switch ignition off
  • Outlet valve -N167- operates
  • Gauge pressure increases: AWD: 90 ± 25 bar
  
      -- Disconnect pressure gauge : VAG1310A  and bleed brakes BRAKE FLUID, BLEEDING    
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