Isuzu N-Series. Manual - part 454
6E-152 EMISSION AND ELECTRICAL DIAGNOSIS
Troubleshooting
Caution taken in inspecting
1. In inspecting system, write down Diagnostic Trouble Code (DTC) to be indicated.
(especially, when plural self-diagnosis codes are indicated.)
2. Before eliminating the indicated DTC by a memory clear switch, doubly inspect abnormal place as indicated in
DTC.
Inspection Procedure Flowchart (Diagnostic System Check)
Notice:
Please note that some items of DTC may not be generated unless the engine is warmed up or unless the vehicle is
driven under load.
Self-diagnosis Functions
Memorization of diagnostic trouble code
The self-diagnosis code indicated will be memorized in
Electronically Erasable Programmable Read Only Mem-
ory (EEPROM) with in the Engine Control Module
(ECM).
Accordingly even if the starter switch turns off or the
ECM is removed from the vehicle, the memorized self-
diagnosis code will not be eliminated.
* Unless an elimination procedure is taken, the diagnos-
tic trouble code (DTC) will remain in memory. (The
memory will be eliminated only by a memory clear
switch.)
Elimination of diagnostic trouble code
The DTC memorized in the EEPROM with in the ECM
can be eliminated only by the operation of the memory
clear switch. The elimination method memory clear
switch will be described below:
N6A1297E