Isuzu 2000 Trooper Workshop Manual page 1185

6E–316
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 1. Ignition "ON," engine "OFF", review and record
Tech 2 Failure Records Data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor "DTC" info for DTC P0404
until the DTC P0404 test runs. Note the result.
Does the Tech 2 indicates DTC P0404 failed this
ignition?
3 1. Disconnect the EGR valve harness connector.
2. Inspect the EGR valve and connectors for damaged
pin or terminals.
Were there any damaged pins or terminals?
4 Repair the damaged pin or terminal.
5 1. Remove EGR valve from Engine.
2. Inspect EGR valve whether there is any excessive
carbon deposit on EGR shaft.
Was excessive carbon deposit on EGR valve shaft?
6 1. Clean up EGR valve shaft and inside of EGR valve.
2. Visually inspect damage of pintle and seat if is bent,
leakage may occur.
Was there any severe damage which affects function?
7 1. Reconnect.
2. Ignition "OFF".
3. Install the Tech 2.
4. Run the engine at idle.
5. On the Tech 2, select EGR Control Test.
6. Use the "UP" arrow to increase the EGR from 0% to
40%.
Did EGR work properly?
8 Replace the EGR valve.
Does DTC P0404 still fail "DTC" test on the Tech 2?
9 Replace the PCM.
IMPORTANT: The
programmed.
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?
DTC P0404 – EGR Open Stuck
Action
replacement PCM
Refer to On-Vehicle Service in
Module and Sensors
Value(s)
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must be
for
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Yes No
Go to OBD
System
Check
Go to Step 2
Refer to
Diagnostic
Aids
Go to Step 3
Go to Step 4 Go to Step 5
Is the action
Verify repair complete?
Go to Step 6 Go to Step 7
Verify repair
Go to Step 8 Go to Step 7
— Go to Step 8
Go to Step 9 Verify repair
Verify repair —