DTC P1273 FUEL PUMP
[YD (WITH EURO-OBD)]
Diagnostic Procedure EBS013GB
1. PERFORM FUEL PUMP LEARNING VALUE CLEARING
NOTE:
If the DTC is detected because of air mixed with fuel (i.e.: caused by lack of fuel), it may become normal by
performing following procedure.
With CONSULT-II
1. Turn ignition switch ON.
2. Perform Fuel Pump Learning value clearing. Refer to EC-981, "Fuel Pump Learning Value Clearing" .
3. Start engine and let it idle for at least 60 seconds.
4. Select  SELF-DIAG RESULT mode with CONSULT-II.
5. Touch  ERASE .
6. Perform EC-1238, "DTC Confirmation Procedure" , again.
7. Is 1st trip DTC P1273 detected again?
With GST
1. Turn ignition switch ON.
2. Perform Fuel Pump Learning value clearing. Refer to EC-981, "Fuel Pump Learning Value Clearing" .
3. Start engine and let it idle for at least 60 seconds.
4. Select MODE 4 with GST.
5. Perform EC-1238, "DTC Confirmation Procedure" , again.
6. Is 1st trip DTC P1273 detected again?
Yes or No
Yes >>GOTO2.
No >> INSPECTION END
2. CHECK FUEL PUMP POWER SUPPLY CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector and fuel pump harness connectors.
MBIB1574E
1. Fuel pump temperature sensor 2. Fuel pump harness connector
3. Check harness continuity between ECM terminal 10 and fuel pump terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
EC-1240