Bendix Commercial Vehicle Systems EC-17 ANTILOCK TRACTION CONTROL4/10 - Manual (Page 26)

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SECTION VII B - TESTING THE WHEEL SPEED SENSOR
START HERE FROM
SECTION VII A
GO TO SECTION III "INSPECTION
FOR ILLUMINATED LEDs"
SAME LEDs ILLUMINATED?
NO
ARE ANY LEDs ILLUMINATED?
NO
YES
ARE SAME RED LEDs ILLUMINATED ?
YES
NO
YES
REPLACE THE EC-17 ™
CONTROLLER.
REPAIR OR REPLACE SPEED
SENSOR WIRING HARNESS
1
2
3
J2 LEFT FRONT W. S. RTN
J1 LEFT FRONT W. S. SIGNAL
H3 RIGHT FRONT W. S. RTN
H2 RIGHT FRONT W. S. SIGNAL
A1,2,3 GROUND
B1,K2,3 POWER
K J H G F E D C B A
30 PIN CONNECTOR
C3 LEFT MID W.S. RTN.
C2 LEFT MID W.S. SIGNAL
F3 LEFT REAR W.S. RTN
F2 LEFT REAR W.S. SIGNAL
B3 RIGHT MID W.S. RTN.
B2 RIGHT MID W.S. SIGNAL
E3 RIGHT REAR W.S. RTN
E2 RIGHT REAR W.S. SIGNAL
F E D C B A
18 PIN CONNECTOR
1
2
3
YES
IGNITION OFF. REMOVE CONNECTOR FROM EC-17 ™
CONTROLLER. MEASURE RESISTANCE BETWEEN THE
APPROPRIATE SPEED SIGNAL (+) AND SIGNAL RETURN (-).
RESISTANCE FOR BENDIX ® SENSORS IS BETWEEN 1500-
2500 OHMS. REFER TO VEHICLE MANUAL FOR THE
RESISTANCE VALUES IF OTHER THAN WS-20 ™ SENSOR IS
IN USE. CHECK CONTINUITY BETWEEN POWER (B1,K2,3)
AND SPEED SIGNAL THEN BETWEEN GROUND (A1,2,3)
AND SPEED SIGNAL. NO CONTINUITY PERMITTED.
REPLACE THE SENSOR
NO
NO
YES
CORRECT RESISTANCE?
DISCONNECT CONNECTOR AT SPEED SENSOR.
INSPECT THE CONNECTOR, THEN CHECK THE
RESISTANCE BETWEEN TWO PINS ON SENSOR.
RESISTANCE BETWEEN 1500-2500 OHMS FOR THE
BENDIX ® SENSORS. NO CONTINUITY PERMITTED
BETWEEN GROUND (A1, 2, 3) AND SPEED SIGNAL.
RECONNECT CONNECTOR AT SPEED
SENSOR AND EC-17 ™ CONTROLLER
AND DO MAGNETIC RESET. NOTE IF
ANY RED LEDS ARE ILLUMINATED.
REPEAT THE “INITIAL
START-UP PROCEDURE”.
GO TO SECTION III "INSPECTION
FOR ILLUMINATED LEDs"