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4B THERMIC MOT KO
Condition for error detection
Interrupted or disconnected motor temperature sensor.
Verify:
- The state of the wiring harness and the temperature sensor connector
- Connect a 600 ohm resistance to the sensor connector:
• If the alarm disappears, replace the temperature sensor
If the alarm persists replace the logic unit.
4C ENCODER LOCK
Condition for error detection
Interrupted or disconnected motor encoder.
The alarm appears after 10 seconds approximately with the accelerator pedal pressed.
The machine works at reduced speed and at maximum current.
• Disconnect the pump from the motor and see if the motor runs freely
• Check the state of the pump motor encoder
4D UNUSED
Encoder basic electric diagram.
In the figure there is only one signal (A).
The encoders used generate two equal signals,
with a 90° difference (A-B).
1. Connect the tester positive point (red) to the
encoder positive terminal.
2. Connect the tester COM point (black) to the
encoder signal (A).
According to the engine position, the following
values will be displayed:
• low signal: 0.5 -- 1.5 Volt
• high signal: 10.5 -- 11.5 Volt
Intermediate values cannot be read as the motor
is stopped.
If the motor is working, the multemeter will
automatically read the Mv (medium value)
Mv= 5,5 - 6,5 Volt
Carrying out this test directly on the logic
connectors it is possible to determine if the
signals are good (see upper description) or if the
channels are opened or in shour circuit. If the
signals are good, the problem should be
attributed to the logic unit.
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