TOHATSU 200 Series Service Manual page 64

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FUEL SYSTEM
MIL IS ON BUT DTC IS 0 OR DOES
NOT COMMUNICATE
1. DLC power/GND line open circuit inspection
Turn the combination switch OFF and disconnect
the HDS.
Turn the combination switch ON.
Measure the voltage at the DLC
(Yellow/Black) terminal and No.2 (Black) terminal.
Does battery voltage exit?
YES
NO
2. DLC signal line short circuit inspection
Measure the voltage between the DLC
(Light green) terminal and engine ground.
Is the measurement within 4.75 – 5.25 V?
YES
NO
3. MIL ON line short circuit inspection
Turn the combination switch OFF.
Disconnect ECM connector A
Turn the combination switch ON and check the MIL.
Does the MIL go OFF?
YES
NO
4. MAP sensor power line short circuit inspection 1
Turn the combination switch OFF.
Connect ECM connector A
Disconnect the MAP sensor 3P connector
Turn the combination switch ON and check the MIL.
Does the MIL go OFF?
YES
NO
5-8
– GO TO STEP 2.
– • Repair open in the Yellow/Black wire
between the No.10 fuse and DLC.
• Repair open in the Black wire between
the ground cable
• If main wire harness is normal, inspect
the No.10 fuse circuit in the fuse/relay
junction box (page 10-11).
– GO TO STEP 3.
– Repair short in the main wire harness
between the ECM and the DLC.
– GO TO STEP 4.
– Repair short in the main wire harness
between the ECM and the MIL.
.
– Replace the MAP sensor.
– GO TO STEP 5.
No.3
and DLC.
No.4
SCS
(Light green)
.
.
DLC
GND1 IGP3
(Black) (Yellow/Black)
DLC