Hard Start Symptom - Isuzu Trooper 1999 Workshop Manual

6E–434
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step
1 DEFINITION: Engine cranks, but does not start
for a long time. Does eventually run, or may start
but immediately stalls.
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 visual/physical check performed?
4 Check engine coolant temperature (ECT) sensor for
shift in value. After 8 hours with the hood up and the
engine not running, connect the Tech 2. With the
ignition "ON" and the engine not running, compare
engine coolant temperature to intake air temperature.
Are ECT and IAT within the specified value of each
other?
5 1. Using a Tech 2, display the engine coolant
temperature and note the value.
2. Check the resistance of the engine coolant
temperature sensor.
3. Refer to Engine Coolant Temperature Sensor
Temperature vs. Resistance chart on DTC P0118
Diagnostic Support for resistance specifications.
Is the resistance value near the resistance for the
temperature noted?
6 Replace the ECT sensor.
Is the action complete?
7 Locate and repair high resistance or poor connection in
the ECT signal circuit or the ECT sensor ground.
Is the action complete?
8 1. Check for a faulty, plugged, or incorrectly installed
PCV valve.
2. If a problem is found, repair as necessary.
Was a problem found?
9 1. Check for water- or alcohol-contaminated fuel.
2. If a problem is found, repair as necessary.
Was a problem found?
1. Perform the procedure in Fuel System Pressure
10
Test .
2. If a problem is found, repair as necessary.
Was a problem found?
11 1. Check for proper ignition voltage output with spark
tester J 26792 (ST-125). Refer to Electric Ignition
System for procedure.
2. If a problem is found, repair as necessary.
Was a problem found?

Hard Start Symptom

Action Value(s) Yes
Go to Step 2
—
— Verify repair
Go to Step 4
—
5°C ( 9°F) Go to Step 9
— Go to Step 7
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
— Verify repair
No
Go to OBD
System
Check
Go to Step 3
Go to
Visual/Physic
al Check
Go to Step 5
Go to Step 6
—
—
Go to Step 9
Go to Step 10
Go to Step 11
Go to Step 12