Allison B 500 - Page 82

6–46 Copyright © 1998 General Motors Corp.
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
Figure 6–14. Code 25 Schematic Drawing (Units Produced 9/94–12/97)
A
139 YELLOW
B 5
B
148 GREEN
B 14
B 9
OUTPUT SPEED HI
OUTPUT SPEED LO
OUTPUT SPEED
A
149 ORANGE
B 15
B 18
B
140 BLUE
B 6
TURBINE SPEED HI
TURBINE SPEED
TURBINE SPEED LO
A
141 VIOLET
B 7
B
150 ORANGE
B 16
ENGINE SPEED HI
ENGINE SPEED LO
TRANSMISSION
V
U
A
B
ENGINE
SPEED
SENSOR
HD/B 500
TURBINE
SPEED
SENSOR
OUTPUT
SPEED
SENSOR
ECU
SPEED SENSOR CIRCUITS
USE TWISTED PAIRS OF WIRE
B 9
B 27
B 18
B 7
B 16
B 15
B 14
B 5
B 1
A
B
B
V01597
ECU
(BLACK)
B 6
A
B
NOTE 1: These wires may pass through a bulkhead connector or a sensor connector.
NOTE 2: These wires may pass through a sensor connector.
DRAIN — 24V SYSTEMS ONLY
SEE NOTE 2
SEE NOTE 1
SEE NOTE 2
MD/B 300/B 400
TURBINE
SPEED
SENSOR
CODE 25 XX — OUTPUT SPEED SENSOR, DETECTED AT ZERO SPEED,
X RANGE