2004 ISUZU TF SERIES Workshop Manual

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Page 2097 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E -101

NO CHECK ENGINE LAMP (MIL)

RTW46EM F000401

CIRCUIT DESCRIPTION
The “Check Engine" lamp (MIL) should always be
illuminated and steady with

Page 2098 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-102 3.5L ENGINE DRIVEABILITY AND EMISSIONS

No Check Engine Lamp (MIL)

Step
Action Value (s) Yes No
1
Check the meter fuse (15A). If the fuse is burnt out,
repair as necessary.
Was the pr

Page 2099 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E -103

Step
Action Value (s) Yes No
6
Replace the ECM.
Is the action complete?
IMPORTANT:
The replacement ECM must be
programmed. Refer to section of

Page 2100 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-104 3.5L ENGINE DRIVEABILITY AND EMISSIONS

CHECK ENGINE LAMP (MIL) “ON" STEADY

RTW46EM F000401

CIRCUIT DESCRIPTION
The “Check Engine" lamp (MIL) should always be
illuminated and st

Page 2101 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E -105

Check Engine Lamp (MIL) “ON" Steady

Step Action Value (s) Yes No
1
1. Ignition "Off", engine "Off".
2. Disconnect the ECM connector.

Page 2102 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-106 3.5L ENGINE DRIVEABILITY AND EMISSIONS

FUEL INJECTOR COIL TEST
PROCEDURE AND FUEL INJECTOR
BALANCE TEST PROCEDURE

Test Description
Number(s) below refer to the step number(s) on

6E-106 3.5L ENGINE DRIVEABILITY AND EMISSIONS

FUEL INJECTOR COIL TEST
PROCEDURE AND FUEL INJECTOR
BALANCE TEST PROCEDURE

Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
2.
Relieve the fuel pressure by connecting the 5–
8840–0378–0 Fuel Pressure Gauge to the fuel
pressure connection on the fuel rail.
CAUTION: In order to reduce the risk of fire and
personal injury, wrap a shop towel around the fuel
pressure connection. The towel will absorb any fuel
leakage that occurs during the connection of the
fuel pressure gauge. Place the towel in an approved
container when the connection of the fuel pressure
gauge is complete.

Place the fuel pressure gauge bleed hose in an
approved gasoline container.

With the ignition switch “OFF," open the valve on
the fuel pressure gauge.

3.
Record the lowest voltage displayed by the DVM
after the first second of the test. (During the first
second, voltage displayed by the DVM may be
inaccurate due to the initial current surge.)

Injector Specifications:

Resistance Ohms Voltage Specification at
10
C
35C (50F
95F)
11.8 – 12.6 5.7 – 6.6

The voltage displayed by the DVM should be within
the specified range.
The voltage displayed by the DVM may increase
throughout the test as the fuel injector windings
warm and the resistance of the fuel injecto
r
windings changes.
An erratic voltage reading (large fluctuations in
voltage that do not stabilize) indicates an
intermittent connection within the fuel injector.
5.
Injector Specifications:

Highest Acceptable
Voltage Reading
Above/Below 35
C/10C
(95
F/50F) Acceptable Subtracted
Value
9.5 Volts 0.6 Volts
7.
The Fuel Injector Balance Test portion of this chart
(Step 7 through Step 11) checks the mechanical
(fuel delivery) portion of the fuel injector. An engine
cool-down period of 10 minutes is necessary in
order to avoid irregular fuel pressure readings due
to “Hot Soak" fuel boiling.

Page 2103 of 4264

ISUZU TF SERIES 2004 Workshop Manual 3.5L ENGINE DRIVEABILITY AND EMISSIONS 6E -107

Injector Coil Test Procedure (Steps 1-6) and Injector Balance Test Procedure
(Steps 7-11)

CYLINDER 1 2 3 4 5 6
1st Reading (1) 296 kPa
(

Page 2104 of 4264

ISUZU TF SERIES 2004 Workshop Manual 6E-108 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Injector Coil Test Procedure (Steps 1-6) and Injector Balance Test Procedure
(Steps 7-11)

Step Action Value(s) YES NO
1
Was the “On-Board Diagno

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