Antilock Brakes / Traction Control Systems: Tools and Equipment

The Bosch ABS 2 LED-Tester will check the following:
^ hydraulic modulator and relays
^ wheel speed sensors
^ warning light
^ cable harness/connectors
^ brake light switch signal
^ alternator signal

The tester is not designed to check the electronic control unit.

Note: Certain steps of the test sequence require two technicians.

1 - Rotary switch
used during program switch positions #5 and #6 to select the solenoid/wheel to be tested
2 - Analog gauge
used to check the operation of the selected wheel speed sensor
3 - LED
indicator for battery voltage
4 - 7 LEDs
indicate the condition of: ground connections, warning light diode, internal resistance of solenoid valve, OFF position of solenoid valve relay
5 - Push button
used to operate return pump
6 - 2 LEDs
monitor alternator connections and brake light switch connections
7 - Adapter plug
for connecting the tester to the ABS wiring harness in the vehicle
8 - LED
that monitors return pump operation
9 - 2 LEDs
(Not Applicable)
10 - LED
monitors the ON position of the solenoid valve relay
11 - LED
indicates current availability for the pressure hold check of the selected solenoid valve
12 - Push button
used during functional check of selected solenoid valve (pressure hold)
13 - Push button
used during functional check of selected solenoid valve (pressure reduction)
14 - LED
indicates current availability for the pressure reduction check of the selected solenoid valves