Isuzu 1999 RODEO Workshop Manual page 715

6E1–88
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
CAUTION: To reduce the risk of fire and personal
injury:
f It is necessary to relieve fuel system pressure
before connecting a fuel pressure gauge. Refer to
Fuel Pressure Relief Procedure, below.
f A small amount of fuel may be released when
disconnecting the fuel lines. Cover fuel line
fittings with a shop towel before disconnecting, to
catch any fuel that may leak out. Place the towel in
an approved container when the procedure is
completed.
Fuel Pressure Relief Procedure
1. Remove the fuel cap.
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. Use a Tech 2 to command the fuel pump ON.
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. Ignition SW "On", Engin Off.
4. 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?
Fuel System Electrical Test
Action
2. Remove the fuel pump relay from the underhood
relay center.
3. Start the engine and allow it to stall.
4. Crank the engine for an additional 3 seconds.
Fuel Gauge Installation
1. Remove the shoulder fitting cap.
2. Install fuel gauge J 34730–1 to the fuel feed line
located in front of and above the right side valve
cover.
3. Reinstall the fuel pump relay.
Value(s)
— Go to Step 2
— Go to Step 3
— completed
— Go to Step 6
— Verify repair
Go to Step 12
—
— Go to Step 8
— Verify repair
Yes No
Go to OBD
System
Check
Go to Step 4
Test Go to Step 12
Go to Step 5
—
Go to Step 7
Go to Step 9
—