TRANSMISSION AND TORQUE CONVERTER CD5515-2/YB5515-2 SERVICE MANUAL
7-12 Published 1-20-2017, Control# 483-02
Electrical Troubleshooting Chart
Problem Possible Cause Remedy
No drive at engine start up 1. Blown ECU fuse.
2. ECU connector loose.
1. Check ECU fuse (also check fuse
to shift lever).
2. Check that connector is mating
correctly with ECU.
No drive and continuous warning
buzzer.
1. Attempting to select drive with
parking brake engaged.
1. Release parking brake.
No drive. 1. Faulty shift control.
2. Parking brake sticking.
3. Faulty transmission harness.
1. Check control and wiring.
2. Check parking brake assembly.
3. Check harness continuity and
connector.
Missing gears. 1. Faulty solenoid(s).
2. Faulty shift control.
3. Low oil pressures.
1. Check solenoid(s) and wiring.
2. Check control and wiring.
3. Check clutch pack and mainline
pressures.
No 4th gear. 1. Faulty speed signal. 1. Check speed sensor and wiring.
2. Check speed sensor installation
(i.e., distance from transfer case).
Down speed protection does not seem
to be working.
1. Faulty speed signal. 1. Check speed sensor and wiring.
Will not downshift and repeating
double beep sounded.
1. Speed too high for selected
downshift.
1. Slow crane with brakes. Deselect
downshift.
Lower gear than lever selected. 1. Kickdown engaged. 1. Check kickdown switch and wiring.
Kickdown will not engage and double
beep sounded.
1. Speed too high to engage lower
gear.
1. Slow crane and try kickdown
again.
Kickdown not operating. 1. Faulty kickdown input. 1. Check kickdown switch and wiring.
Reference Only
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