Hino 238, Workshop Manual

Page: 506 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1283
1. Check that the malfunction pattern from the malfunction reproduc-
tion test carried out in step 19, and replace the pertinent part.
<Reproduction test results>
a, g: Replace the supply pump.
b, c, d, h, i, j: Replace the SCV.
e: Replace the common rail.
f: Check the fuel return pipe/hose.
2. After replacing the part, perform the SCV test and malfunction
reproduction test again.
3. Compare the test results with those obtained in step 4 and check if
they improved.
NO YES
1. Check if the fuel return pipe and hose are clogged.
NO YES
1. Perform an SCV test and a malfunction reproduction test.
•
For a detailed procedure, refer to the separate "SCV free acceler-
ation test".
2. Compare the test results with those obtained in step 4 and check if
they improved.
20
SCV free acceleration test [Hino-DX]
Select
Engine
SAPH16F010301006
Did the test results improve?
Procedure completed.
Perform "After-inspection work" of INFOR-
MATION section. Go to step 21.
21
Inspect the fuel return pipe and hose
Was any failure found?
Repair or replace the faulty part, and go to
step 22. Go to step 22.
22
SCV free acceleration test [Hino-DX]
Select
Engine
SAPH16F010301007