BENDIX M-21-M-22 ANTILOCK MOD ASSY Especificaciones Pagina 38

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3 Diagnostics, Troubleshooting and Testing
34
Meritor WABCO Maintenance Manual MM-0112 (Revised 05-13)
NOTE: For correct sensor operation, there must be a jumper wire on
the harness side across either Pin 2 to Pin 3 so terminating resistor
is connected as shown in Figure 3.39.
Figure 3.38
Figure 3.39
Figure 3.40
Figure 3.41
ECU Circuit Testing
Electrical Checks
Verify vehicle batteries, charging system and fuses are in good
working condition.
Load test battery and ignition circuits to ground at the ECU
harness using a 2-4 amp sealed lamp and verify lamp does not
flicker and it is on steady.
Location Measurement
Meritor Wabco SAS terminating
resistor
Approximately 180 ohms
CAN High Voltage 2.5-5.0V
CAN Low Voltage 0.1-2.4V
Voltage Supply to Ground 8.0-16.0V
ESC CAN-High to ESC CAN-Low Approximately 90 ohms
SAS harness jumper (Pin 2 to
Pin 4 or Pin 2 to Pin 3)
Continuity
ESC CAN-High or CAN-Low to
Power or Ground
No continuity
With ESC, SAS and ECU
unplugged harness by itself for
battery voltage or ground
No continuity
Figure 3.38
Figure 3.39
4006873a
4010631a
4
CAN-HIGH
180 OHM
CAN-LOW
+U-BATT
GND
3
2
1
5
6
STEERING ANGLE SENSOR
Figure 3.40
Pin Circuit
1CAN-Low
2 Terminating Resistor
3CAN-High
4CAN-High
5Power
6 Ground
Figure 3.41
4007216a
STEERING ANGLE SENSOR CONNECTOR
123456
4007215a
CAB MOUNT ECU:
LOOKING INTO WIRE
HARNESS CONNECTOR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
X4
FRAME MOUNT ECU
WITH ESC:
LOOKING INTO WIRE
HARNESS CONNECTOR
12
3456
71012 911 8
131618 1517 14
X2-GREEN
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