section 8 ISUZU TF SERIES 2004 Workshop Manual

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–87
F0: Diagnostic Trouble Code
The purpose of the “Diagnostic Trouble Codes” mod e i s
to display stored trouble code in the ECM.
When “Clear DTC Information” is selected, a “Clear
DTC Information”, warning screen appears.
This screen informs you that by cleaning DTC's “all
stored DTC information in the ECM will be erased”.
After clearing codes, confirm system operation by test
driving the vehicle.
Symptom Code:
This number or alphabet means identification of the
malfunction. Each DTC includes plural symptoms, such
as DTC P0100 has four kinds of symptom code (7), (9),
(B) and (C). DTC chart (check procedure) is separated
depending on the symptom code.F1: Data Display
The purpose of the “Data Display” mode is to
continuously monitor data parameters.
The current actual values of all important sensors and
signals in the system are display through F1 mode.
See the “Typical Scan Data” section.
F2: Snapshot
“Snapshot” allows you to focus on making the condition
occur, rather than trying to view all of the data in
anticipation of the fault.
The snapshot will collect parameter information around
a trigger point that you select.
F3: Miscellaneous Test:
The purpose of “Miscellaneous Test” mode is to check
for correct operation of electronic system actuators.
F4: Programming (Factory Use Only)
The purpose of “Programming” is to program VIN in the
ECM and lock the programmed data. F0: Diagnostic Trouble Codes
F0: Read DTC Infor As Stored By ECU
F1: Clear DTC Information
F1: Data Display
F2: Snapshot
F3: Miscellaneous Test
F0: Lamps
F0: Glow Time Telltale Test
F1: Relays
F0: Glow Time Relay Test
F2: Solenoids
F0: EGR Solenoid Test
F3: Engine Speed (RPM) Control
F4: Programming
F0: Program VIN
F1: Lock ECU
Read DTC Infor A s Stored By ECU

P0100 Present
(7) Mass Air Flow (MAF) Sensor
Voltage Supply Circuit High Input
DTC No.
Symptom Code

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–99
SERVICE PROGRAMMING SYSTEM (SPS)
The procedure to program the control unit by using the
Service Programming System (SPS) software contained
in TIS2000 is ex plained below.
NOTE:
If the Engine Control Module (ECM) was
programmed, the Immobilizer System must be
linked to the ECM: Refer to section 11
“Immobilizer System-ECM replacement” for the
ECM/Immobilizer linking procedure.
Should Tech2 display "SPS Procedure was not
successful", engine will not start, but no DTCs
are present, low battery voltage or poor electrical
connections should be the primary suspects.
Perform the SPS procedure again after rectifying
the fault/s.IMPORTANT:
Perform the following checks before attempting to
program the control unit:
The Tech2 PCMCIA card is programmed with The
latest software release.
The latest release of TIS2000 is loaded on the PC.
The vehicle battery is fully charged.
The control unit to be programmed is connected
to the vehicle.
1. Preparations of TIS 2000
1. Connect Tech 2 to P/C.
2. Check to see if Hardware Key is plugged into Port.
3. Activate TIS 2000 by P/C.
4. On the activating screen of TIS2000, choose
“Service Programming System”
5. On the screen of “Diagnostic Tester and Processing
Program Selection”, choose the one that will comply
with the following.
Tech-2 in use
New programming by the ex isting module or new
programming by the replaced/new module.
Fix ing position of the control unit.6. Upon completion of the selection, push the button of
“Nex t”.

6E–108 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
11Using the DVM and check the data link connector
communication circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the ECM connector.
3. Check the circuit for open or short to ground
circuit.
Was the problem found?
—Repair faulty
harness and
verify repair Go to Step 12
12Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?—Verify repair Go to Step 13
13Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.—Veri fy repai r— Step Action Value(s) Yes No





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4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–111
6 Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.—Veri fy repai r— Step Action Value(s) Yes No

4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E–11 3
Check Engine Lamp (MIL) On Steady
Step Action Value(s) Yes No
1 1. Ignition “Off”, engine “Off”.
2. Disconnect the ECM connector.
3. Ignition “On”.
Was the “CHECK ENGINE” lamp turned on?—Go to Step 2 Go to Step 4
2 Using the DVM and check the “CHECK ENGINE”
lamp circuit.
1. Ignition “Off”, engine “Off”.
2. Disconnect the meter connector and ECM
connector.
3. Check the circuit for short to ground circuit.
Was the problem found?
—Veri fy repai rGo to Step 3
3 Replace the meter assembly.
Is the action complete?—Veri fy repai r—
4 Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?—Veri fy repai rGo to Step 5
5 Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.—Veri fy repai r—
42
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4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –131
8 Using the DVM and check the MAF sensor power
supply circuit.
1. Ignition “Off ”, engine “Off ”.
2. Disconnect the MAF & IAT sensor connector and ECM connector.
3. Check the circuit for short to MAF sensor +12V supply circuit.
Was the DVM indicated specified value?
No continuity Go to Step 10Go to Step 9
9 Repair the circuit for short to MAF sensor +12V supply circuit.
Is the action complete? —Verify repair —
10 Repair the short to battery voltage circuit between the ECM and MAF sensor.
Was the problem solved?
— Verify repair Go to Step 13
11 Substitute a known good MAF & IAT sensor assembly and recheck.
Was the problem solved? —Go to Step 12 Go to Step 13
12 Replace the MAF & IAT sensor assembly. Is the action complete? —Verify repair —
13 Is the ECM programmed with the latest software release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)” .
Was the problem solved? —Verify repair Go to Step 14
14 Replace the ECM. Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement ” for
the ECM/Immobilizer linking procedure. —Verify repair —
Step Action Value(s) Yes No
4
2
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4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –133
7 Using the DVM and check the MAF sensor power
supply circuit.
1. Ignition “Off ”, engine “Off ”.
2. Disconnect the MAF & IAT sensor connector and ECM connector.
3. Check the circuit for short to MAF sensor ground circuit.
Was the DVM indicated specified value?
No continuity Go to Step 9Go to Step 8
8 Repair the circuit for short to MAF sensor ground. Is the action complete? —Verify repair —
9 Repair the short to ground circuit between the ECM and MAF sensor.
Was the problem solved?
— Verify repair Go to Step 12
10 Substitute a known good MAF & IAT sensor assembly and recheck.
Was the problem solved? —Go to Step 11 Go to Step 12
11 Replace the MAF & IAT sensor assembly. Is the action complete? —Verify repair —
12 Is the ECM programmed with the latest software release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System) ”.
Was the problem solved? —Verify repair Go to Step 13
13 Replace the ECM. Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement ” for
the ECM/Immobilizer linking procedure. —Verify repair —
Step Action Value(s) Yes No
4
3
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6E –136 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
8 Repair the open circuit between the ECM and MAF
sensor.
Was the problem solved?
— Verify repair Go to Step 13
9 Using the DVM and check the MAF sensor +12V supply circuit.
1. Ignition “On ”, engine “Off ”.
2. Disconnect the MAF & IAT sensor connector.
3. Check the circuit for open circuit.
Was the DVM indicated specified value?
10-14.5V Go to Step 11Go to Step 10
10 Repair the open circuit between the ECM main relay and MAF sensor.
Was the problem solved? —Verify repair Go to Step 11
11 Substitute a known good MAF & IAT sensor assembly and recheck.
Was the problem solved? —Go to Step 12 Go to Step 13
12 Replace the MAF & IAT sensor assembly. Is the action complete? —Verify repair —
13 Is the ECM programmed with the latest software release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System) ”.
Was the problem solved? —Verify repair Go to Step 14
14 Replace the ECM. Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement ” for
the ECM/Immobilizer linking procedure. —Verify repair —
Step Action Value(s) Yes No
83
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4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS 6E –139
8 Using the DVM and check the MAF sensor signal
circuit.
1. Ignition “On ”, engine “Off ”.
2. Disconnect the MAF sensor connector.
3. Check the circuit for short to power supply circuit.
Was the DVM indicated specified value?
Less than 1V Go to Step 9 Repair faulty
harness and verify repair
9 Substitute a known good MAF & IAT sensor assembly and recheck.
Was the problem solved? —Go to Step 10 Go to Step 11
10 Replace the MAF & IAT sensor assembly. Is the action complete? —Verify repair —
11 Is the ECM programmed with the latest software release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System) ”.
Was the problem solved? —Verify repair Go to Step 12
12 Replace the ECM. Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement ” for
the ECM/Immobilizer linking procedure. —Verify repair —
Step Action Value(s) Yes No
5
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6E–144 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
8 Using the DVM and check the vacuum pressure
sensor signal circuit.
1 . I g n i t i o n " O n " , e n g i n e " O f f " .
2. Disconnect the vacuum pressure sensor
connector.
3 . C h e c k t h e c i r c u i t f o r s h o r t t o p o w e r s u p p l y c i r c u i t .
Was the DVM indicated specified value?
Less than 1V Go to Step 9Repair faulty
harness and
verify repair
9 Substitute a known good vacuum pressure sensor
a n d re ch e c k.
Was the problem solved? - Go to Step 10Go to Step 11
10 Replace the vacuum pressure sensor.
Is the action complete? - Verify repair -
11 Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the "SPS (Service Programming System)".
Was the problem solved? - Verify repair Go to Step 12
1 2 R e p l a c e t h e E C M .
I s t h e a c t i o n c o mp l e t e ?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 "Immobilizer System-ECM replacement" for
the ECM/Immobilizer linking procedure. - Verify repair - Step Action Value(s) Yes No
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