1A-34 Engine Control System (4HK1)
Diagnostic Starting Point - Engine Controls
Begin the system diagnosis with Diagnostic System
Check - Engine Controls. The Diagnostic System
Check - Engine Controls will provide the following
information:
• The identification of the control modules which
command the system.
• The ability of the control modules to communicate
through the serial data circuit.
• The identification of any stored diagnostic trouble
codes (DTCs) and the their statuses.
The use of the Diagnostic System Check - Engine
Controls will identify the correct procedure for
diagnosing the system and where the procedure is
located.
Important: Engine Control System Check Sheet must
be used to verify the customer complaint, you need to
know the correct (normal) operating behavior of the
system and verify that the customer complaint is a valid
failure of the system.
Reading Flash Diagnostic Trouble Codes (DTC)
The provision for communicating with the ECM is the
Data Link Connector (DLC). The DTC(s) stored in the
ECM memory can be read either through a hand-held
diagnostic scanner such as Tech 2 plugged into the
DLC or by counting the number of flashes of the
malfunction indicator lamp (MIL) or the service vehicle
soon (SVS) lamp when the diagnostic test terminal of
the DLC is grounded. The DLC terminal "12"
(diagnostic request) is pulled "Low" (grounded) by
jumped to DLC terminal "4", which is a ground wire.
Once terminals "12" and "4" have been connected, turn
the ignition switch ON, with the engine OFF. The MIL
(Except Euro 4 specification) or the SVS lamp (Euro 4
specification) will indicate a DTC three times is a DTC
is present and history. If more than one DTC has been
stored in the ECM's memory, the DTCs will be output
numerical order with each DTC being displayed three
times. The flash DTC display will continue as long as
the DLC is shorted.
Diagnostic Trouble Codes (DTC) Clear Method by
Accelerator Pedal Operation (Except Euro 4
Specification)
If there is no scan tool, history DTCs can be cleared
using accelerator pedal operation.
1. Turn ON the ignition, with the engine OFF.
2. Use a jumper wire and the DLC terminal "12"
(diagnostic request) is pulled "Low" (grounded) by
jumped to DLC terminal "4".
3. Depress accelerator pedal within 1 to 3 seconds.
4. Release accelerator pedal within 1 to 3 seconds.
5. Depress accelerator pedal within 1 to 3 seconds.
6. Release accelerator pedal within 1 to 3 seconds.
7. Depress accelerator pedal within 1 to 3 seconds.
8. Release accelerator pedal within 1 to 3 seconds.
Notice: DO NOT touch the accelerator pedal when it is
released. Clearing DTCs may fail.
LNW76ESF000101
ON
OFF
ON
OFF
1.2
2.4
2.4 2.4
2nd digit number 1st digit number
2.40.6
2
1.2
0.6 0.6 0.6
0.3 0.3 0.3
0.3 0.3 0.3 0.3 0.3
Example:DTC 23 stored Unit: Second
Example:DTC 225 stored
3rd digit
number
2nd digit number 1st digit number
0.6 0.6 0.6 0.6 0.6 0.6 0.60.6
3
0.3 0.3 1.2 1.2
22 5
LG4HKED-WE-0871.book 34 ページ ２００７年１１月２９日 木曜日 午後６時２９分
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