Isuzu 1999 RODEO Workshop Manual page 1676

Excessive Exhaust Emissions or Odors Symptom
Step
1 DEFINITION:
Vehicle fails an emission test. Vehicle has excessive
"rotten egg" smell. (Excessive odors do not necessarily
indicate excessive emissions.)
Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
3 Was a thorough visual/physical check performed?
4 1. Check for vacuum leaks. Check vacuum lines,
intake manifold, throttle body, etc.
2. If a problem is found, repair as necessary.
Were any vacuum leaks located?
5 1. Check the fuel cap for proper installation.
2. Secure the fuel cap if necessary.
Was the fuel cap installed properly?
6 1. Check the fuel pressure. Perform the procedure in
Fuel System Pressure Test .
2. If a problem is found, repair as necessary.
Was a problem found?
7 1. Check for a faulty, plugged, or incorrectly installed
crankcase ventilation valve; also check the
crankcase ventilation system for plugging.
2. If a problem is found, repair as necessary.
Was a problem found?
8 1. Check the injector connections.
2. If any of the injectors are connected to an incorrect
cylinder, correct as necessary.
Was a problem found?
1. Perform the "Injector Coil/Balance Test" in Fuel
9
Metering System .
2. If a problem is found, repair as necessary.
Was a problem found?
10 1. Refer to Engine Cooling for cooling system
diagnosis.
2. If a problem is found, repair as necessary.
Was a problem found?
11 1. Check EVAP canister for fuel loading. Refer to
Evaporative Emission Control System .
2. If a problem is found, repair as necessary.
Was a problem found?
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Action Value(s) Yes
— Go to Step 2
Go to Step 13
—
— Go to Step 4
Go to Step 13
—
— Go to Step 6
— Go to Step 13
— Go to Step 13
— Go to Step 13
— Go to Step 13
Go to Step 13
—
— Go to Step 13
6E2–433
No
Go to OBD
System
Check
Go to Step 3
Go to
Visual/Physic
al Check
Go to Step 5
Go to Step 13
Go to Step 7
Go to Step 8
Go to Step 9
Go to Step 10
Go to Step 11
Go to Step 12