Fault Isolation Procedures

Code 24 (SID 6, FMI 2) Speed Input Error, continued

Step C

Procedure

Condition

Action

 

 

 

 

1.Measure resistance between Central Processing Unit 32-way connector pin C10 and ground.

If resistance is more than

 

Replace Central Processing

10K ohms or open circuit

 

Unit. Go to Step V.

 

[OL]

 

 

If resistance is less than 10K

 

Go to Step D.

ohms

 

 

 

 

DC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15 16

 

OHMS

 

V

COM

A

GROUND

Step D

Procedure

Condition

Action

 

 

 

 

1.Disconnect VORAD harness from speed source.

2. Measure resistance

 

If resistance is 2 to 4K ohms

between speed sensor

 

 

 

 

pins A and B.

 

 

 

 

If resistance is outside of

 

 

range

 

 

OHMS

 

A

B

 

 

 

V

COM

A

Go to Step E.

Replace speed sensor. Go to Step V.

2-65

Page 76
Image 76
BENDIX BW2849 manual 10K ohms or open circuit, Ohms, Between speed sensor Pins a and B