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.