Isuzu 1999 RODEO Workshop Manual page 1089

6A–4 ENGINE MECHANICAL (6VD1 3.2L)
Engine Diagnosis
Hard Starting
1. Starting Motor Does Not Turn Over
Troubleshooting Procedure
Turn on headlights and starter switch.
Condition
Headlights go out
considerably considerably
2. Ignition Trouble — Starting Motor Turns Over But Engine Does Not Start
Spark Test
Disconnect an ignition coil from any spark plug. Connect
the spark plug tester J–26792 (ST–125), start the engine,
and check if a spark is generated in the spark plug tester.
Condition
Spark jumps across gap
No sparking takes place
3. Trouble In Fuel System
Condition
Starting motor turns over and spark
occurs but engine does not start. occurs but engine does not start
Possible cause
or dim Battery run down or under charged
Terminals poorly connected
Starting motor coil circuit shorted
Starting motor defective
Possible cause
Spark plug defective
Ignition timing incorrect
Fuel not reaching fuel injector(s) or
engine
Valve timing incorrect
Engine lacks compression
Ignition coil disconnected or broken
Electronic Ignition
module
Poor connections in engine harness
Powertrain Control Module cable
disconnected or defective
Possible cause
Fuel tank empty
Water in fuel system
Fuel filter clogged
Fuel pipe clogged
Fuel pump defective
Fuel pump circuit open
Evaporative
System circuit clogged
Multiport Fuel Injection System faulty
Recharge or replace battery
Clean battery posts and terminals
and connect properly
Overhaul or replace
Overhaul or replace
Before starting the engine, make sure that the spark plug
tester is properly grounded. To avoid electrical shock, do
not touch the part where insulation of the ignition coil is
broken while the engine is running.
Clean, adjust spark gap or replace
Refer to Ignition System
Refer to item 3 (Trouble in fuel
system)
Adjust
Refer to item 4 (Engine lacks
compression)
Connect properly or replace
System with Replace
Correct
Correct or replace
Fill
Clean
Replace filter
Clean or replace
Replace
Correct or replace
Emission Control Correct or replace
Refer to "Electronic Fuel Injection"
section
Correction
Correction
Correction