Check - Isuzu 2000 Trooper Workshop Manual

6E–108
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 1. Read the "Caution" above.
2. Relieve the fuel system pressure and install the fuel
pump pressure gauge to the test fitting.
3. Ignition ON, Engine is Off.
4. Use a Tech 2 to command the fuel pump "ON."
(Refer to the Miscellaneous Test.)
Is there an immediate pressure build-up which
indicates the pump is running?
3 1. Verify that the pump is not running by removing the
fuel filler cap and listening.
2. Command the pump "ON" with the Tech 2.
Did the pump turn "OFF" after 2 seconds?
4 1. Ignition "OFF."
2. Remove the fuel pump relay.
3. Using a test light connected to ground, probe the
battery feed to the relay.
Did the light illuminate?
5 Repair short or open battery feed to fuel pump relay.
Is the action complete?
6 1. Connect a test light between the two wires that
connect to the fuel pump relay pull-in coil.
2. Ignition "ON."
Did the test light illuminate for 2 seconds and then turn
off?
7 1. With a test light connected to battery (–), probe the
fuel pump relay connector at the wire which runs
from the relay pull-in coil to the PCM.
2. Ignition "ON."
Did the test light illuminate for 2 seconds and then turn
off?
8 Locate and repair open in the fuel pump relay ground
circuit.
Is the action complete?
9 Check for short or open between the PCM and the fuel
pump relay.
Was a problem found?
10 1. Check the fuel pump relay circuit for a poor terminal
connection at the PCM.
2. If a problem is found, replace terminal as necessary.
Was a problem found?
Fuel System Electrical Test
Action Value(s) Yes
— Go to Step 2
— Go to Step 3
Test
— completed
Go to Step 6
—
— Verify repair
— Go to Step 12
— Go to Step 8
— Verify repair
— Verify repair
— Verify repair
No
Go to OBD
System

Check

Go to Step 4
Go to Step 12
Go to Step 5
—
Go to Step 7
Go to Step 9
—
Go to Step 10
Go to Step 11