BENDIX M-21-M-22 ANTILOCK MOD ASSY Especificaciones Pagina 26

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3 Diagnostics, Troubleshooting and Testing
22
Meritor WABCO Maintenance Manual MM-0112 (Revised 05-13)
Figure 3.14
Modulator Valve Testing
Electrical Checks
Check modulator valve by itself for resistance. Figure 3.15 and
Figure 3.16.
Check ECU harness and modulator valve together for resistance.
Figure 3.17 and Figure 3.18.
Verify no change in resistance or open circuit between valve by
itself and through harness.
Check harness by itself for any shorts to battery and shorts to
ground.
Measurements should read as follows:
Figure 3.14
4007204a
FRAME MOUNT ECU WITHOUT ESC:
LOOKING INTO WIRE
HARNESS CONNECTOR
FRAME MOUNT ECU WITH ESC:
LOOKING INTO WIRE
HARNESS CONNECTOR
12
3456
710129118
12
3456
710129118
X1-GRAY X2-BLACK
X4-BROWN
(ONLY FOR 6 CHANNEL)
X4-BROWN
(ONLY FOR 6 CHANNEL)
X3-GREEN
12
3456
71012 911 8
123456
710129118
12
3456
710129118
12
3456
710129118
12
3456
710129118
X1-BLACK
X3-GREEN
131618 1517 14
12
3456
71012 911 8
131618 1517 14
X2-GREEN
ECU Sensor Connector Pins
Cab-Mounted
Universal with ESC,
Universal or Basic
LF X2-18 pin 12 and 15
RF X2-18 pin 10 and 13
LR X2-18 pin 11 and 14
RR X2-18 pin 17 and 18
LR (3rd axle) X3-15 pin 2 and 5
RR (3rd axle) X3-15 pin 11 and 14
Frame-Mounted
Non-ESC
LF X2-Black 7 and 8
RF X2-Black 5 and 6
LR X3-Green 1 and 2
RR X3-Green 3 and 4
LR (3rd axle) X4-Brown 3 and 4
RR (3rd axle) X4-Brown 5 and 6
Frame-Mounted
With ESC
LF X2-Green 17 and 18
RF X2-Green 5 and 6
LR X3-Green 1 and 2
RR X3-Green 3 and 4
LR (3rd axle) X4-Brown 3 and 4
RR (3rd axle) X4-Brown 5 and 6
Location Measurement
Inlet valve pin to Ground 4.0-9.0 ohm for 12V system
11.0-21.0 ohm for 24V system
Outlet valve pin to Ground 4.0-9.0 ohm for 12V system
11.0-21.0 ohm for 24V system
At ECU harness pins with
modulator valve connected
Same as above, no more than 1
ohm difference
ECU harness by itself for battery
voltage or ground
No continuity
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