Workhorse ALLISON 1000MH Service Manual page 186

WORKHORSE CUSTOM CHASSIS
Service Manual
– A damaged terminal
– Poor terminal tension
– A chafed wire
– A broken wire inside the insulation
• When diagnosing for an intermittent short or open,
massage the wiring harness while watching the test
equipment for a change.
• You may have to drive the vehicle in order to experience
a condition.
• If the condition is intermittent, connect the scan tool and
select the speed sensor indicated by the code. If the
signal is erratic, investigate and eliminate the following:
– Intermittent wiring connection
– Excessive vibration, such as driveline or engine
torsionals
– Irregular sensor gap, such as a loose sensor, a loose
tone wheel or a damaged tone wheel
– Inspect that the speed sensor wiring consists of twisted
pairs at the rate of 12-16 twists per 300 mm (12 in).
These twists must extend the entire length of the
wiring harness to within at least 50 mm (2 in) of the
speed sensor connector.
DTC P0726
Step
Schematic Reference: Automatic Transmission Controls Schematics
1 Did you perform the Diagnostic System Check - Vehicle?
WSM082106
SECTION
7.2
Action
© 2006 Workhorse Custom Chassis — All Rights Reserved
PAGE
186
Automatic Transmission – Allison
Value
—
2007 W Series Chassis
Yes No
Go to Step 2 Go to Diagnostic
System Check -
Vehicle
2007 W Series