2004 ISUZU TF SERIES Workshop Manual

clock setting ground clearance wheel oil light climate control

Page 2105 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-109
Step Action Value(s) YES NO
5
1. Set injector switch box injector #1.
2. Press the “Push to Start Test" button on the fuel
injector tester.
3

Page 2106 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-110 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value(s) YES NO
9
1. Connect the 5–8840–2618–0 Fuel Injector Tester
and 5–8840–2635–0 Injector Switch Box the fuel
injector

6E-110 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value(s) YES NO
9
1. Connect the 5–8840–2618–0 Fuel Injector Tester
and 5–8840–2635–0 Injector Switch Box the fuel
injector harness connector.
2. Set the amperage supply selector switch on the
fuel injector tester to the “Balance Test" 0.5-2.5
amp position.
3. Using the Tech 2 turn the fuel pump “ON" then
“OFF" in order to pressurize the fuel system.
4. Record the fuel pressure indicated by the fuel
pressure gauge after the fuel pressure stabilizes.
This is the first pressure reading.
5. Energize the fuel injector by depressing the “Push
to Start Test" button on the fuel injector tester.
6. Record the fuel pressure indicated by the fuel
pressure gauge after the fuel pressure gauge
needle has stopped moving. This is the second
pressure reading.
7. Repeat steps 1 through 6 for each fuel injector.
8. Subtract the second pressure reading from the first
pressure reading for one fuel injector. The result
is the pressure drop value.
9. Obtain a pressure drop value for each fuel injector.
10. Add all of the individual pressure drop values.
This is the total pressure drop.
11. Divide the total pressure drop by the number of
fuel injectors. This is the average pressure drop.
Does any fuel injector have a pressure drop value that
is either higher than the average pressure drop or
lower than the average pressure drop by the specified
value? 10 kPa
(1.5 psi) Go to Step 10 Go to OBD
System Check
10 Re-test any fuel injector that does not meet the
specification. Refer to the procedure in step 11.
Do not repeat any portion of this test before running
the engine in order to prevent the engine from
flooding.
Does any fuel injector still have a pressure drop value
that is either higher than the average pressure drop or
lower than the average pressure drop by the specified
value? 10 kPa
(1.5 psi) Go to Step 11 Go to
Symptoms
11 Replace the faulty fuel injector(s). Refer to Fuel
Injector.
Is the action complete? — Verify repair —

Page 2107 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-111
FUEL SYSTEM ELECTRICAL TEST

RTW36ELF000101
CIRCUIT DESCRIPTION
When the ignition switch is first turned “ON," the Engine
Control Module (EC

Page 2108 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-112 3.5L ENGINE DRIVEABILITY AND EMISSIONS
CAUTION: To reduce the risk of fire and personal
injury:
It is necessary to relieve fuel system pressure
before connecting a fuel pressure gauge. Re

Page 2109 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-113
Step Action Value (s) Yes No
5
Using the DVM and check the fuel pump relay.
1. Ignition "Off", engine "Off".
2. Remove the fuel pump relay

Page 2110 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-114 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Step Action Value (s) Yes No
9
Using the DVM and check the fuel pump relay power
supply circuit.
1. Ignition "Off", engine "Off".
2. Remo

Page 2111 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E-115
Step Action Value (s) Yes No
13
Using the DVM and check the fuel pump ground
circuit.
1. Ignition "Off", engine "Off".
2. Disconnect the

Page 2112 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-116 3.5L ENGINE DRIVEABILITY AND EMISSIONS
FUEL SYSTEM DIAGNOSIS

RTW36ELF000501
Legend
(1) Fuel Filler Cap
(2) Fuel Tank
(3) Rollover Valve
(4) Fuel Pump Assembly
(5) Fuel Filte

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