Bendix Commercial Vehicle Systems EC-17 ANTILOCK TRACTION CONTROL4/10 - Manual (Page 30)

30
MOD
RESET
FRT
RER
MID
RHT
LFT
TRC
SEN
ECU
VLT
SECTION XI - TESTING TRACTION CONTROL MODULATOR
ARE "TRC" AND "MOD"
LEDs ON?
START HERE
These LEDs
Illuminated?
1
2
3
F E D C B A
18 PIN CONNECTOR
D3 D2
1
2
3
K J H G F E D C B A
30 PIN CONNECTOR
A1 GROUND
A2 GROUND
A3 GROUND
1
2
3
F E D C B A
2 pin Modulator
Connector
TURN IGNITION OFF AND REMOVE 18 PIN
CONNECTOR FROM EC-17™ CONTROLLER.
CHECK RESISTANCE BETWEEN PINS D2 & D3.
RESISTANCE SHOULD BE 10 - 12 OHMS.
REMOVE 30 PIN CONNECTOR AND CHECK
CONTINUITY BETWEEN GROUND (A1,2,3)
AND D2 & D3. NO CONTINUITY PERMITTED.
CHECK CONDITION OF 18 PIN
CONNECTOR CLEAN, RECONNECT,
TURN IGNITION ON & PASS MAGNET
OVER EC-17 ™ CONTROLLER
RESET. REPEAT "INITIAL START-UP
PROCEDURE"
YES
RESISTANCE CORRECT & NO
CONTINUITY TO GROUND?
D3 D2
DISCONNECT 2 PIN CONNECTOR AT MODULATOR &
CHECK RESISTANCE OF CONNECTOR HALF ATTACHED
TO ANTILOCK TRACTION RELAY. RESISTANCE
SHOULD BE 10 - 12 OHMS. THEN CHECK CONTINUITY
BETWEEN GROUND ON 30 PIN CONNECTOR (A1,2,3)
AND BOTH PINS ON THE 2 PIN CONNECTOR LEADING
TO THE MODULATOR. NO CONTINUITY PERMITTED.
NO
NO
YES
RESISTANCE CORRECT & NO
CONTINUITY TO GROUND?
EC-17 ™ Controller and
AntiLock Traction Relay
(Modulator)
REPLACE ANTILOCK
TRACTION RELAY
(MODULATOR)
WITH IGNITION ON, INSPECT EC-17 ™
CONTROLLER FOR ILLUMINATED LEDs
REPAIR OR REPLACE WIRE
HARNESS (FROM 18 PIN
CONNECTOR TO 2
PIN CONNECTOR)
IS "TRC" ONLY ON?
NO
YES
GO TO SECTION XII "TESTING ENGINE
CONTROL MODULE WIRE HARNESS"
YES