BENDIX M-21-M-22 ANTILOCK MOD ASSY Specifikace stáhnout pdf (Strana 35)

3 Diagnostics, Troubleshooting and Testing

Meritor WABCO Maintenance Manual MM-0112 (Revised 05-13)

Figure 3.30

ESC CAN Network Testing

The ECU, SAS and ESC module are all connected on propriety CAN

network with internal terminating resistors on each one of these

components. A failure to one of the components will cause others to

fault out. Figure 3.31 and Figure 3.32

Figure 3.31

Figure 3.32

ESC Module Testing

Electrical Checks

For the following checks, all of the ECU connectors must be plugged

in as well as the SAS. The ECU provides voltage, ground and CAN

communication to ESC module.

앫 Take measurements at the ESC module harness connector.

Figure 3.33 and Figure 3.34.

앫 Measure voltage supply Key ON.

앫 Measure CAN High voltage Key ON.

앫 Measure CAN Low voltage Key ON.

앫 Measure terminating resistance across CAN High and Low with

Key OFF.

앫 Frame-mounted ECU only: Measure ground resistance Key OFF

to chassis ground.

With ECU and ESC Module disconnected:

앫 Verify continuity end to end on each line

앫 Verify no shorts to ground or battery on all lines.

앫 Verify no continuity between pins.

Measurements should read as follows:

Figure 3.30

Figure 3.31

4010626a

4010627a

SAS

ESC

MODULE

CAB

ECU

CAN

GND

Figure 3.32

4010628a

SAS

ESC

MODULE

FRAME

ECU

CAN

GND

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 97 98

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