EFI SYSTEM

EF–6
1.6 ITEMS TO BE OBSERVED WHEN USING OBD II GENERIC SCAN TOOL OR DS-21
DIAGNOSIS TESTER
CAUTION:
For enhanced safety, be sure to observe the following points:
• Before using the OBD II generic scan tool or the DS-21 diagnosis tester, be sure to thoroughly
read the instruction manual of the OBD II generic scan tool or the instruction manual of the DS-21
diagnosis tester.
• When driving the vehicle with the OBD II generic scan tool or the DS-21 diagnosis tester connected
to the vehicle, route the cables in such a way that they may not interfere with the driving.
(That is to say, the cables should be routed away from the feet, pedals, steering wheel and shift
lever.)
• When performing the test driving, using the OBD II generic scan tool or the DS-21 diagnosis
tester, two persons are needed. One person drives the vehicle, while the other person operates
the OBD II generic scan tool or the DS-21 diagnosis tester.
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1.7 HANDLING INSTRUCTIONS ON ENGINE CONTROL SYSTEM
1. The ECU, sensors, etc. are precision parts. Be very careful not to give strong impacts to those parts
during the installation and removal. Never use those parts to which impacts have been given (for example,
in cases where the parts were dropped on the floor).
2. When the test is carried out on a rainy day or the vehicle is washed, care must be exercised so that no
water may be admitted and the ECU, connectors, sensors, actuators, etc. may not get wet.
3. Never disconnect the connector from the battery terminal while the engine is running. At the moment
when the connector is disconnected from the battery terminal, a great counter electromotive force (approx.
100 V) may be generated, thus damaging the ECU.
4. Never connect the connectors to the wrong terminals of the battery. Failure to observe this caution may
break the inside of the battery instantly.
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5. Never remove the cover from the ECU proper or the
bracket on the ECU proper side. Furthermore, do not
touch the attaching screws.
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