TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 1274 of 1313
SOLID OVERSPEED WARNING LIGHT - Continued
STEP
2.
IS THE SPEED SIGNAL GENERATOR WORKING PROPERLY?
a.
Refer to point to point schematics.
T0455DAA
TRANSFER
CASE
SPEED SIGNAL
GENERATOR
Figure 2.
Speed Signal Generator.
b.
Replace the speed signal generator with a known good unit and retest CTIS
operation. (Volume 2, WP
0323)
c.
Drive vehicle above 5 mph.
d.
Check CTIS operation.
CONDITION/INDICATION
IS THE SPEED SIGNAL GENERATOR WORKING PROPERLY?
DECISION
YES - Go to Step (3) to verify problem is solved.
NO - Replace the electronic control unit (ECU) (Volume 5, WP
0813). Go to Step (3) to verify problem is solved.
STEP
3.
IS YOUR ORIGINAL PROBLEM STILL PRESENT?
a.
Ensure vehicle is returned to normal operating condition.
b.
Check to see if your original problem still exists.
CONDITION/INDICATION
IS YOUR ORIGINAL PROBLEM STILL PRESENT?
DECISION
YES - Notify supervisor.
NO - Problem fixed.
END OF WORK PACKAGE
TM 9-2320-272-23-1
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