PRECAUTIONS
EC-17
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EC
Precaution
NBS000M9
●
Always use a 12 volt battery as power source.
●
Do not attempt to disconnect battery cables while engine is
running.
●
Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect battery
ground cable. Failure to do so may damage the ECM
because battery voltage is applied to ECM even if ignition
switch is turned OFF.
●
Before removing parts, turn ignition switch OFF and then
disconnect battery ground cable.
●
Do not disassemble ECM.
●
If a battery cable is disconnected, the memory will return to
the ECM value.
The ECM will now start to self-control at its initial value.
Engine operation can vary slightly when the terminal is dis-
connected. However, this is not an indication of a malfunc-
tion. Do not replace parts because of a slight variation.
●
If the battery is disconnected, the following emission
related diagnostic in formation will be lost within 24 hours.
–
Diagnostic trouble codes
–
1st trip diagnostic trouble codes
–
Freeze frame data
–
1st freeze frame data
–
System readiness test (SRT) codes
–
Test values
●
When connecting ECM harness connector, fasten it
securely with a lever as far as it will go as shown in the fig-
ure.
●
When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminal, when connecting pin connectors.
●
Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge)
voltage to develop in coil and condenser, thus resulting in
damage to ICs.
●
Keep engine control system harness at least 10 cm (4 in)
away from adjacent harness, to prevent engine control sys-
tem malfunctions due to receiving external noise, degraded
operation of ICs, etc.
●
Keep engine control system parts and harness dry.
SEF289H
PBIB1164E
SEC406D
PBIB0090E