Work Description - Yanmar 3TNV82A Troubleshooting Manual

FAILURE DIAGNOSIS

Work Description

1. Check of the sensor resistance value (sensor only):
• Between accelerator sensor terminals A and C (all the resistance value)
Remove the accelerator sensor from the harness.
•
Measure the resistance between sensor terminals A and C (all the resistance value) using a circuit tester.
•
(REF) Total resistance value of Yanmar standard accelerator sensors
NG
OK
• Between accelerator sensor terminals A and B
Measure the resistance between accelerator sensor terminals A and B using a circuit tester.
•
Check if the resistance value between accelerator sensor terminal A and B fluctuates when the
•
accelerator throttle is moved.
NG
OK
2. Check of the sensor resistance value (sensor + harness):
• Between harness E38 and E28 (total resistance value)
Connect accelerator sensor and harness, and remove E-ECU from the harness.
•
Measure the resistance between harness side E-ECU connectors E38 and E28 (total resistance value)
•
using a circuit tester.
*See above-mentioned "(REF) Total resistance value of Yanmar standard accelerator sensors".
NG
OK
• Between harness E38 and E28
Measure the resistance between E-ECU connectors E35 and E28 using a circuit tester.
•
Check if the resistance value between E-ECU connectors E35 and E28 fluctuates when the accelerator
•
throttle is moved.
NG
OK
1-142
Terminal
Sensor A - C
Replace the accelerator sensor.
Check the resistance value between accelerator sensor terminal A and B. → Go to
[• Between accelerator sensor terminals A and B]
Replace the accelerator sensor.
Check the sensor resistance with the sensor and the harness being connected. →
Go to [2. Check of the sensor resistance value (sensor + harness):]
Check the harness for correct continuity. → [3. Check of harness continuity:]
Check the resistance value between the harness E35 and E28. → Go to [• Between
harness E38 and E28]
Check the harness for correct continuity. → [3. Check of harness continuity:]
Check the sensor resistance with the sensor and the harness being connected. →
[2. Check of the sensor resistance value (sensor + harness):]
Method and Procedure of Failure Diagnosis
Specification
5 ± 1.5kΩ
TNV DI Service Manual