Troubleshooting
Error codes
© BT Repair manual SWE100, 120, 120L, 120S, 140, 140L, 200D 7 – 19
Order no.. Date Valid from serial no. T code
258946-120 2012-08-30 6061850- 841×842×843
4.521
The main contactor is open. Pump motor voltage too low.
Check:
• the wiring harness between the
transistor regulator and the pump
motor
• the pump motor.
4.522
The main contactor is open. Pump motor voltage too high.
Check:
• the wiring harness between the
transistor regulator and the pump
motor.
• the pump motor.
4.540
Transistor regulator stops all functions. • The transistor regulator output to the
lowering valve is short-circuited.
• Internal short-circuit in the transistor
regulator.
• Inspect the connections and wiring
harness.
• Disconnect the wiring to the lowering
valve and try restarting the truck.
• If the error remains, replace the
lowering valve or the transistor
regulator.
4.541
Transistor regulator stops all functions. The transistor regulator output to the
lowering valve is short-circuited to B-.
Inspect the connections and wiring
harness.
4.560
Transistor regulator stops all functions. The transistor regulator output to the
lowering valve is open.
Check:
• connections and wiring harness
• the lowering valve coil.
Code Event Possible cause
Action
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