Isuzu engine C22NE / 22LE / 20LE. Manual — part 55
DRIVEABILITY AND EMISSIONS 6E1-49
On-Board Diagnosis (Self-Diagnosis)
1. The Engine Control Module (ECM) conducts a self-
test of most of the wiring and components in the
system each time the key is turned to ON, and can
detect faults in the system while the key is ON. If a
fault is detected, the ECM will store a trouble code
in memory and flash the CHECK ENGINE indicator
to alert the driver.
2. The Diagnostic Trouble Codes (DTC) can be
displayed by shorting together terminals and of the
Data Link Connector (DLC) located behind front
console.
The CHECK ENGINE indicator will flash DTC 12
three times, followed by any DTC. If several DTC
are stored, each DTC will be displayed three times.
The DTC will be displayed in numerical order. The
DTC display will continue as long as the DLC is
shorted.
Some DTC can cause other DTC to be stored, It is
important to diagnose and repair the lowest
numbered DTC first before going on to the higher
numbered DTC.
6E1-50 DRIVEABILITY AND EMISSIONS
Tech 2 Scan Tool
From 98 MY, Isuzu dealer service departments are
recommended to use Tech 2. Please refer to Tech 2
user guide.
Legend
(1) PCMCIA Card
(2) RS 232 Loop Back Connector
(3) SAE 16/19 Adaptor
(4) DLC Cable
(5) Tech-2
DRIVEABILITY AND EMISSIONS 6E1-51
Getting Started
• Before operating the Isuzu PCMCIA card with the
Tech 2, the following steps must be performed:
1. The Isuzu 98 System PCMCIA card (1) inserts into
the Tech 2 (5)
2. Connect the SAE 16/19 adapter (3) to the DLC
cable (4).
3. Connect the DLC cable to the Tech 2 (5)
4. Make sure the vehicle ignition is off.
5. Connect the Tech 2 SAE 16/19 adapter to the
vehicle DLC.
6. The vehicle ignition turns on.
7. Verify the Tech 2 power up display.
NOTE: The RS232 Loop back connector is only to use
for diagnosis of Tech 2 and refer to user guide of the
Tech 2.
Operating Procedure
The power up screen is displayed when you power up
the tester with the Isuzu systems PCMCIA card.
Follow the operating procedure below.
6E1-52 DRIVEABILITY AND EMISSIONS
Menu
• The following table shows, the Tech 2 menu
structure.
F0: Diagnostic Trouble Codes
F0: Read DTC Info Ordered By Priority
F1: Clear DTC Information
F1: Data Display
F0: Engine Data
F2: O2 Sensor Data
F2: Snapshot
F3: Miscellaneous Tests
F0: Engine Check Light
F1: Relays
F1: A/C Relay
F2: Fuel Pump Relay
*F3: Low Fan Replay
*F4: High Fan Replay
F2: Canister Purge Solenoid
F3: IAC System
F1: RPM Control
F2: IAC Control
F3: IAC Reset
F4: Fuel System
F1: Fuel Trim Reset
F2: Fueling Mode
F7: Air Fuel Ratio
Note : *F3 & F4 not applicable to TF models
Note: Selection Table
Appricable
Version
Engine
Displacement
Compression
Ratio
Fuel Octane No.
(RON)
Destination
*Shows w/canister for EVAP. Emission
control
Version 1
2.2L
8.6
80 Leaded/Un-Leaded
*Ecuador, *Gulf, China, Egypt, Kenya,
Nigeria and Philippine
Version 2
2.2L
9.2
85 Leaded/Un-Leaded Chile, Colombia, Guatemala and Costarica
Version 3
2.2L
9.2
91 Un-Leaded
*Australia, *New Zealand and South Africa
Version 4
2.0L
8.8
91 Leaded/Un-Leaded South Africa
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