6-1-26 ENGINE DIAGNOSIS (RHZ ENGINE WITH TRIPLE-CONNECTOR ECM)
1. Double relay
2. ECM
3. Fuel pump
4. “FUEL PUMP” fuse (15 A)
5. Double relay fuse (30 A)
6. To radiator fan relay No.3
DTC P0230 FUEL PUMP SUPPLY CIRCUIT MALFUNCTION
WIRING DIAGRAM
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool and run engine
at idle speed for 10 sec. or more.
3) Turn ON ignition switch after OFF for 5 sec.
4) Check DTC and pending DTC by using scan tool.
TROUBLESHOOTING
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Is operating sound heard from fuel pump? Substitute a known-
good ECM and
recheck.
Go to Step 3.
3 Check Double Relay
1) Check double relay referring to Section 6E3.
Is it in good condition?
Go to Step 4. Faulty double relay.
4 Check Fuel Pump Output Circuit
1) Remove ECM cover referring to “Voltage Check”
in this section.
2) Check voltage between E228-48 and ground.
D Within 5 sec. after ignition switch ON: about 0 V
D Over 5 sec. after Ignition switch OFF: 10 – 14 V
Is check result as specified?
D Poor E228-48
connection
D “BLK”, “PNK/BLK”
or “BRN/RED” wire
open/short
D Fuse broken or
D Faulty fuel pump
If all are OK, substitute
a known-good ECM
and recheck.
“GRN/OGN” wire
open/short.
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