Isuzu 2000 Trooper Workshop Manual page 1183

6E–314
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 P0402
until the DTC P0402 test runs. Note the result.
Does the Tech 2 indicates DTC P0402 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.
Is the action complete?
5 1. Remove EGR valve from Engine.
2. Inspect EGR valve whether there is any foreign
material between seat and pintle.
Was any foreign material in EGR valve?
6 1. Remove EGR valve foreign material from EGR
valve and clean up inside.
2. Visually inspect damage of pintle and seat, which
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 Tech-II, select special function for EGR.
6. Use the "UP" arrow to increase the EGR from 0% to
40%.
Did EGR work properly?
8 Replace the EGR valve.
Does DTC P0402 still fail "DTC" test on the Tech 2?
9 Replace the EGR valve.
Is the action complete?
DTC P0402 – EGR Pintle Crank Open Error
Action Value(s) Yes
— Go to Step 2
— Go to Step 3
Go to Step 4
—
— Verify repair
— Go to Step 6
Go to Step 7
—
— —
— Go to Step 9
— Verify repair
No
Go to OBD
System
Check
Refer to
Diagnostic
Aids
Go to Step 5
—
Go to Step 7
Verify repair
Go to Step 8
Go to Step 8
Verify repair
—