Isuzu 1999 RODEO Workshop Manual page 867

6E1–240 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0404 EGR Circuit Range/Performance (Cont'd)
Step
12 Replace the PCM.
IMPORTANT: The
programmed. Refer to On–Vehicle Service in
Powertrain Control
procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
13 Check the EGR ground circuit for a poor connection or
proper terminal tension at the PCM and repair as
necessary.
Was a repair necessary?
14 Check the 5 V reference circuit for a short to voltage
and repair as necessary.
Was a repair necessary?
15 Check the control circuit for a short to ground and repair
as necessary?
Was a repair necessary?
16 Check the control circuit for an open or poor connection
at the EGR valve electrical connector and repair as
necessary.
Was a repair necessary?
17 Replace the EGR valve.
Is the action complete?
18 Check the PCM electrical connector for a poor
connection and repair as necessary.
Was a repair necessary?
19 1. Using the Tech 2, clear Diagnostic Trouble Codes.
2. Start engine and idle at normal operating
temperature.
3. Operate vehicle within the conditions for setting this
Diagnostic Trouble Code as specified in the
supporting text.
Does the Tech 2 indicate that this diagnostic "Ran and
Passed?"
Action
replacement PCM must
Module and Sensors
Value(s)
be
for
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— Verify repair
Yes No
19 —
Go to Step
19 17
Go to Step
19 12
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19 12
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19 18
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19
Go to Step
19 12
Go to Step 2