should be about 12V; with the card connected, it
should be about 5V. 0V or 12V with the card connected
means that the card is damaged.
Replace control card.
Dash Display
Controller LED
Handset or PC
CONDITION
AL01
1 Flash
INPUT ERROR #1
Connection/communication error between control
card and traction controller.
TRUCK RESPONSE
Traction and hoist functions disabled.
POSSIBLE CAUSES AND TEST PROCEDURE
• Traction reversing switch is not connected.
Install handset. Go to tester function. Check for
operation of traction reversing switch.
Verify that traction reversing switch cover is
making contact with switch on control card.
Check wires in control handle arm are secure.
• Damaged or defective control card.
Replace control card.
Dash Display
Controller LED
Handset or PC
CONDITION
AL01
1 Flash
INPUT ERROR #2
Connection/communication error between control
card and traction controller.
TRUCK RESPONSE
Traction and hoist functions disabled.
POSSIBLE CAUSES AND TEST PROCEDURE
• Traction reversing switch is not connected.
Install handset. Go to tester function. Check for
operation of traction reversing switch.
Verify that traction reversing switch cover is
making contact with switch on control card.
• Damaged or defective cable.
Check steer handle control cable for loose connections
or broken wires.
• Damaged or defective control handle card.
Replace control card.
Dash Display
Controller LED
Handset or PC
CONDITION
AL02
2 Flashes
CONTACTOR CLOSED
Main contactor circuit is damaged.
TRUCK RESPONSE
Traction and hydraulic functions disabled.
POSSIBLE CAUSES AND TEST PROCEDURE
• Main contactor tips are welded closed.
Disconnect power leads at contactor. Use meter
to confirm open circuit across power terminals.
If short circuit is measured, replace contactor.
• Problem in motor field circuit.
Verify electrical connections between motor field
and controller.
Check motor field for shorts to chassis.
• Controller is damaged.
Replace controller.
Dash Display
Controller LED
Handset or PC
CONDITION
AL4
4 Flashes
EVP NOT OK
Lowering valve will not operate correctly.
TRUCK RESPONSE
Traction and hydraulic functions disabled.
POSSIBLE CAUSES AND TEST PROCEDURE
• Damaged or loose electrical connection to
lowering valve.
Verify electrical connections between
valve coil and controller.
• Lowering coil damaged.
Check lowering valve coil for correct resistance.
Coil resistance should be approximately 33 ohms.
FOR REFERENCE ONLY 5/4/10 Rev A
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