Honda NSS250S Manual page 169

MIL Blink Pattern
• If the HDS pocket tester is not available, DTC can be read from the
PCM/ECM memory by the MIL blink pattern.
• The number of MIL blinks is the equivalent to main code of the DTC
(the sub code cannot be displayed by the MIL).
• The MIL will blink the current DTC, in case the PCM/ECM detects the
problem at present, when the ignition switch ON or idling with the
sidestand down. The MIL will stay ON when the engine speed is
-1
over 2,000 min (rpm) or with the sidestand up.
• The MIL has two types of blinks, a long blink and short blink. The
long blinking lasts for 1.3 seconds, the short blinking lasts for 0.3
seconds. One long blink is the equivalent of ten short blinks. For
example, when two long blinks are followed by five short blinks, the
MIL is 25 (two long blinks = 20 blinks, plus five short blinks).
• When the PCM/ECM stores more than one DTC, the MIL will indi-
cate them by blinking in the order from the lowest number to high-
est number.
MIL Check
When the ignition switch is turned ON and engine stop switch " ", the MIL will stay on for a few seconds, then go off. If the
MIL does not come on, inspect the MIL circuit.
CURRENT DTC/STORED DTC
The DTC is indicated in two ways according to the failure status.
• In the case that the PCM/ECM detects a problem at present, the MIL will come on and will start to blink the DTC when
the sidestand is lowered.
• In the case that the PCM/ECM does not detect any problem at present but has a problem stored in its memory, the MIL
will not light and blink. If it is necessary to retrieve the past problem code, readout the stored DTC by following the DTC
readout procedure.
HDS POCKET TESTER INFORMATION
• The HDS can readout the DTC, stored data, current data and other PCM/ECM condition.
How to connect the HDS Pocket Tester
Remove the battery cover (page 19-6).
Turn the ignition switch OFF.
Remove the dummy connector from the DLC.
Connect the HDS pocket tester to the DLC.
Turn the ignition switch ON, check the DTC and freeze data.
• Stored data indicates the engine (and Honda S Matic System) con-
ditions when the first malfunction was detected.
PCM/ECM reset
The HDS can reset the PCM/ECM data including the DTC, stored data
and some learning memory.
DTC READOUT
Start the engine and check the MIL.
• When the ignition switch is turned ON, the MIL will stay on for a few
seconds, then go off.
If the MIL stays on or blinks, connect the HDS Pocket Tester to the DLC
(page 6-15).
Read the DTC, freeze data and follow the troubleshooting index (page
6-19).
To read the DTC with the MIL blinking, refer to the following proce-
dure.
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FUEL SYSTEM (PGM-FI)
MIL
NSS250A shown:
DUMMY CONNECTOR
MIL
DLC
6-15