4-58 FI SYSTEM DIAGNOSIS
Is the main relay OK?
"
4) After repairing the trouble, clear the DTC using SDS tool.
(#4-26)
Step 1 (When indicating P0230-H:)
1) Turn the ignition switch OFF.
2) Remove the front frame cover. (#8-8)
3) Check the fuel pump coupler for loose or poor contacts.
If OK, then check the main relay. (#9-21)
Is the main relay OK?
4) After repairing the trouble, clear the DTC using SDS tool.
(#4-26)
YES
• O/W or Y/W wire open or short or poor

L con-
nection
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO Replace the main relay with a new one.
When using the multi-circuit tester, do not strongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
1
ECM coupler (Harness side)
1
YES
• O/W wire shorted to power source
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO Replace the main relay with a new one.
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