Yanmar 3TNV82A Troubleshooting Manual page 208

FAILURE DIAGNOSIS
Wiring Diagram
: Check points
* For the E-ECU Pin Layout, see [E-ECU Pin Layout Diagram] (P.1-134).
Work Description
1. Harness continuity check:
• Remove the immobilizer and E-ECU from the harness.
• Check the harness continuity using a circuit tester.
Terminal
Immobilizer pulse communication
line E17
[Between E-ECU and immobilizer]
Between E17 and
E38/E43/E48(power supply line)
Between E17 and
E28/E45/E47(GND line)/GND
• Check if the harness is damaged, or if the wiring is correct.
NG
• Replace the harness.
• Check the immobilizer.
OK
• Replace the E-ECU.
1-206
Immobilizer
CAN Communication
Pulse communication
Continuity
Available
Unavailable
Unavailable
Available
Unavailable
Available
Method and Procedure of Failure Diagnosis
ECU
E40
CANH
E39
CANL
E17
APP-IP4
019615-00E
OK: normal
NG: harness disconnection
OK: normal
NG: Harness short-circuited with power
supply
OK: normal
NG: harness short-circuited with GND
TNV DI Service Manual
Status