
62
MicroController Control System
Troubleshooting
PROBLEM 9
Lift sensor circuit defect.
POSSIBLE CAUSE
Lift sensor not adjusted properly or defective;
Lift sensor wiring defect; Valve control card (board)
defect; Logics defect.
Perform Problem 11,12 Tilt or
auxiliary circuit defect.
CHECKS
Retest lift sensor circuit in quick diagnostics.
Circuit passes
Circuit fails
“Quick-Diagnostics”
“Quick-Diagnostics”
Replace logics.
Measure voltage from Pin7 to Pin5 battery
negative as the lever is pulled and released.
9.0 to 11.0 and .2v
9.0 to 11.0 and .2V
Measured
NOT measured
Key switch ON.
Connect multimeter negative lead to Pin5
and the positive lead to Pin1 and Pin2.
Measure the voltage.
Battery Voltage
0 Volt
Repair or replace broken wire
between PD-2 and Pin1(wire #44)
or key switch and Pin2(wire #5) or
between Pin5 and battery
negative(-).
Replace Valve Control Card.
NOTE :
Before lift truck is placed into operation, connect tilt and auxliary switches and verify proper adjustment.
Refer to Valve Control Card Adjustments.
Содержание B20S-3
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