Introduction To Troubleshooting - Hino Motors HINO 155 series Workshop Manual

GENERAL INTRODUCTION/SAFETY INSTRUCTIONS AND READINESS TO WORK
2. INTRODUCTION TO TROUBLE SHOOTING
(1) This document covers the trouble shooting steps 2 and 3 listed below.
(1) Hearing
(2) Prior check
(3) Reproducing technique
(4) Trouble shooting for each
diagnosis code
(5) Trouble shooting for each
trouble symptom
(6) Verification test
(2) Prior check
• Take the following prior check steps.
Diagnosis inspectiondiagnosis deletiontrouble symptom verification (use a reproducing
technique if not reproducible.)diagnosis recheck
• Prior to a reproduction test, identify a system suspected to have a trouble, attach a tester and
other apparatuses and then conduct both a symptom check and an examination on a sus-
pected trouble. For a suspected cause of a trouble symptom, the trouble shooting chart.
Prior check
• Instantaneous occurrence of a trouble symptom will also trigger a failure code. If no troubles
are observed, use a reproducing technique in performing each trouble shooting activity.
• Trouble symptom verification
If not reproducible, take the steps 2, 3 and 4.
If not reproducible, use a reproducing technique (e.g. adjust external conditions and inspect
each wire harness and connector part).
Identify a fact through adequate hearings on the situation
"Step 1"
and environment where a trouble has occurred.
Conduct a diagnosis inspection, a symptom check, a func-
tional inspection and a basic inspection to identify a symp-
"Step 2"
tom. If a symptom check does not gain enough
reproducibility, use a reproducing technique.
Sort the inspection results obtained from the step 2 and con-
"Step 3" duct an systematized inspection in accordance with the pro-
cedures for trouble shooting for each trouble symptom.
Verify that the same trouble will not occur after trouble shoot-
ing. If a trouble is not reproducible enough, conduct a verifi-
"Step 4"
cation test under the reproduced conditions and
environment.
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