Isuzu 4HK-1, Manual, Page: 46 / 50

Trouble Shooting 106
3
1. Check the fuel return pipe between the
supply pump and the fuel tank for
breakage, twist, etc.
2. Check for clogging or twisting in the vent
hose of the fuel tank.
3. Check for foreign matter in the fuel tank.
4. If the trouble is detected, repair as
required.
5. Enforce the diagnostic aid.
Is the trouble detected?
—
Go to Step 6. Go to Step 4.
4
1. Replace the common rail (common rail
pressure sensor) since it seems that
abnormal value of the pressure sensor is
detected.
Note:
For work procedure, refer to “Engine
section” in the service manual.
2. Check the Error Code.
Is the trouble detected?
—
Go to Step 5. Go to Step 6.
5
Replace the supply pump.
Note:
For work procedure, refer to “Engine
section” in the service manual.
Is the procedure completed?
—
Go to Step 6. —
6
Check the Error Code again.
1.
Connect all the harnesses.
2. Clear the Error Code.
Refer to “How to clear diagnosis trouble
code (Error Code)” of “Procedure of
trouble diagnosis” in this section for how to
clear Error Codes.
3. Turn the key switch to “OFF” for more than
10 seconds.
4. Test run with the “Preconditions when
Error Code is set”.
5. Check the Error Code.
Is Error Code 0088 detected?
—
Go to Step 2. Go to Step 7.
7
Check if other Error Code is detected.
Is other Error Code detected?
—
Go to each Error
Code diagnosis. Verify repair.
Step Action Value YES NO