Measure The Ecu +Bp And Ground Voltage; Check The Relay Terminal Voltage -1; Ground Terminal Unsatisfactory; +Bp Terminal Unsatisfactory - Kubota V3800-CR-TE4 Diagnosis Manual

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

1. Measure the ECU +BP and Ground Voltage

1. Turn the key switch ON and measure the voltage between the
ECU +BP terminals (B-5 / B-6) and ground (body / battery
terminal). Then measure voltage between the ECU ground
terminals (B-3 / B-4) and ground (body / battery terminal).
Factory +BP terminal -Ground; greater than or equal to 10 V
specification P-GND terminal -Ground; Less than or equal to 0.5 V

+BP terminal unsatisfactory

OK Normal.
NG Check battery, wiring harness, ground wire.
OK Go to "2. Check the Relay Terminal Voltage -1".
NG Repair or replace.

Ground terminal unsatisfactory

OK Normal.
NG Check ECU wiring harness ground.

2. Check the Relay Terminal Voltage -1

1. Turn the key switch ON and measure voltage at relay terminal
2 (2).
Factory
10 V or higher
specification
OK Check wiring between relay and ECU. → Repair.
Check for connector connection fault. → Repair.
NG Go to "3. Check the Relay Terminal Voltage - 2".
(1) Terminal 1
(2) Terminal 2
(3) Terminal 3
(4) Terminal 4
3. Check the Relay Terminal Voltage - 2
1. Measure voltage at relay terminal 1 (1).
Factory
10 V or higher
specification
OK Go to "4. Check the Relay Terminal Voltage - 3".
NG Check for a wiring harness open circuit and / or connector connection
fault. → Repair.
Inspect fuse. → Replace.
(1) Terminal 1
(2) Terminal 2
(3) Terminal 3
(4) Terminal 4
1-S298
COMMON RAIL SYSTEM
9Y1200192CRS0843US0
(a) Main Relay Terminal Layout
9Y1200186CRS0133US0
(a) Main Relay Terminal Layout
9Y1200186CRS0134US0
KiSC issued 05, 2012 A