TOHATSU 200 Series Service Manual page 90

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FUEL SYSTEM
MIL BLINKS ONCE (HO2S) (Except XT,
XCT, XXT, XXCT types)
(*) Refer
(BF175AK1·200AK1·225AK1: 62ZY300).
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the HO2S 4P connector
connector A
connector 1
Reset the ECM (page 5-2).
Start the engine and let it run at 3,000 min
5 minutes or more under no load.
Let the engine idle for 1 minute or more.
Turn the combination switch OFF and connect the
SCS service connector.
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blink once?
YES
NO
2. HO2S inspection
Turn the combination switch OFF and disconnect
the HO2S 4P connector
Inspect the HO2S (page 5-60).
Is the HO2S correct?
YES
NO
3. Fuel supply system inspection
Turn the combination switch OFF.
Measure the fuel pressure (page 5-114*).
Is the fuel pressure normal?
YES
NO
5-34
to page of base
, ECM connector B
and then reconnect them.
– GO TO STEP 2.
– Temporary failure (code
reappear).
.
– GO TO STEP 3.
– Replace the HO2S with a new one and
recheck.
– Repair open or short in the main wire
harness between the ECM and HO2S. If
the main wire harness is correct, replace
the ECM with a new one, and recheck.
– Repair fuel supply system and recheck
under normal fuel pressure.
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