Check The Key Switch Signal; Check The Key Switch - Kubota V3800-CR-TE4 Diagnosis Manual

V3800-CR-TE4,V3800-CR-TIE4, DM

8. Check the Key Switch Signal -1

1. Connect the diagnosis tool to diagnostic connector (CAN1
connector) and turn the key switch ON.
2. Using the diagnosis tool data monitor function, verify the "Key
Switch" data when the key switch is turned ON then OFF.
Factory When the key switch is set to the ON and OFF, the data
specification output is turned ON and OFF respectively.
IMPORTANT
• Do not keep the key switch in the OFF position for more
than 2 seconds, otherwise a communication error will
occur.
OK ECU internal fault → Replace the ECU.
NG Con- ECU internal fault → Replace the ECU.
stantly
ON
Consis- Go to "9. Check the Key Switch Signal -2".
tently
OFF
(a) CAN1 Connector
9. Check the Key Switch Signal -2
1. Place the key switch in the ON position, and measure the
voltage at ECU terminal B-47 / B-48.
Factory
10 V or higher
specification
OK Check whether the connector is poorly connected.
OK Replace the ECU.
NG Repair the connector.
NG Go to "10. Check the Key Switch -1".

10. Check the Key Switch -1

1. Set the key switch to the ON position, and measure the voltage
at the key switch output terminal (3).
Factory
10 V or higher
specification
OK Check the wiring harness between the key switch output terminal and
ECU terminal (B-47 / B-48), and the fuse. → Repair or replace.
NG Go to "11. Check the Key Switch - 2".
(1) Input Terminal
(2) ACC
(3) Output Terminal
(4) START
1-S300
COMMON RAIL SYSTEM
9Y1200192CRS0603US0
9Y1200192CRS0845US0
(a) Key Switch
9Y1200192CRS0846US0
KiSC issued 05, 2012 A