Kubota V3800-CR-TE4 Diagnosis Manual page 245

V3800-CR-TE4,V3800-CR-TIE4, DM
1. Measure the ECU Terminal Voltage
1. Place the key switch in the OFF position, and measure the
voltage between ECU terminals B-5 / B-6 and the chassis
ground.
Factory
0 V
specification
OK Clear the DTC and check whether it is detected again or not.
OK Normal.
NG Replace the ECU.
NG Go to "2. Check the Key Switch Signal".
2. Check the Key Switch Signal
1. Place the key switch in the OFF position, attach the diagnosis
tool to the CAN1 connector, and return the key switch to the ON
position again.
2. Using the data monitor function of diagnosis tool, check the
"Key switch" data when the key switch is placed in the OFF
position.
Factory
OFF
specification
OK Go to "4. Check the ECU Terminal Voltage".
NG Go to "3. Check the IG-SW Signal".
(a) CAN1 Connector
3. Check the IG-SW Signal
1. Place the key switch in the OFF position, and measure the
voltage at ECU terminals B-47 / B-48.
Factory
0 V
specification
OK Go to "4. Check the ECU Terminal Voltage".
NG 1. Check the wiring harness and the key switch. → Repair.
2. Locate the cause of constant voltage supply to the wiring harness.
4. Check the ECU Terminal Voltage
1. Keep the key switch in the OFF position, and measure the
voltage at ECU main relay terminal B-33.
Factory
10 V or higher
specification
OK Go to "5. Measure the Resistance Between Relay Terminals (for
Confirmation)".
NG 1. Check the wiring harness between relay and ECU and connectors. →
Repair.
2. Locate the cause of constant shorted wiring harness to the ground.
1-S218
COMMON RAIL SYSTEM
9Y1200192CRS0776US0
9Y1200192CRS0395US0
9Y1200192CRS0777US0
9Y1200192CRS0778US0
KiSC issued 05, 2012 A