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TC Series Hydraulic Brake ABS System

030.1-19

When troubleshooting or testing the ABS

system, do not damage the connector

terminals.

Voltage Check

Voltage must be between 9.5 and 14 volts for the 12

volt hydraulic ABS to function properly.

•

To check voltage

1. Turn ignition on.

2. Check for proper voltage between pins (12 and

1) and (12 and 2) on the 18 pin connector.

3. If voltage is not between 9.5 and 14 volts, verify

proper wiring connections. Make corrections as

required.

ABS Indicator

If the ABS indicator lamp does not come on after the

ignition is turned on, or it comes on but does not go

out after 3 seconds, check all ABS fuses or circuit

breakers and replace.

Check the wiring to the ABS diagnostic switch and

the indicator lamp. Repair, or replace the wiring as

required.

•

When checking the indicator lamp

1. Check voltage potential at the lamp socket.

2. Check continuity of the wires to the socket.

3. Replace bulb.

ABS Diagnostic Switch

•

When testing the ABS diagnostic switch

1. Check the resistance between the terminals

while cycling the switch.

2. Check the continuity of the wires to the switch

(pins 5 and 12) and (6 and 12) on the 18 pin

connector.

Sensor Adjustment

Do not pry or push sensors with sharp

objects.

Note

Sensor will self-adjust during wheel

rotation.

No gap is allowed at installation. During

normal operation, a gap not exceeding

0.04 inch is allowable.

To adjust the sensor, push the sensor in until it

contacts the tooth wheel.

Sensor Output Voltage Test

•

Sensor output voltage must be at least 0.2

volts AC at 30 rpm. Test the sensor output

voltage.

1. Turn ignition off.

2. Disconnect the ECU. Measure voltage at the

pins on the ECU connector, disconnect the

sensor from the sensor extension cable.

3. Put blocks under the front and rear tires to keep

the vehicle from moving.

CHOCK THE WHEELS TO PREVENT

THE VEHICLE FROM MOVING.

SUPPORT THE VEHICLE WITH SAFETY

STANDS. DO NOT WORK UNDER A

VEHICLE SUPPORTED ONLY BY JACKS.

4. Raise the vehicle off the ground. Put safety

stands under the axle.

5. Rotate wheel by hand at 30 rpm (1/2 revolution

per second).

6. Measure the voltage at the pins, see Table 4—

Sensor Check Pins.