If you suspect a problem with the fuel pump, check that the fuel pump actually runs; when it is on, you will hear some noise if you listen to the fuel fill port. The fuel pump should run for 2 seconds when the vehicle is turned to ON mode. If the fuel pump does not make noise, check as follows:
1.
Determine possible failure area (FI MAIN RLY OUT line, others):
Determine possible failure area (FI MAIN RLY OUT line, others)
Repair an open in the FI MAIN RLY OUT wire between the relay circuit board and PGM-FI main relay 2.?
3.
Open wire check (IG1 FUEL PUMP line):
Open wire check (IG1 FUEL PUMP line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
PGM-FI main relay 2: disconnected
Test point 1
PGM-FI main relay 2 4P socket (female terminals) No. 1:
Test point 2
Body ground
Is there battery voltage?
YES
Go to step 4.
NO
Check the No. D8 (15 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair an open in the IG1 FUEL PUMP wire between the No. D8 (15 A) fuse and PGM-FI main relay 2. If needed, replace the under-dash fuse/relay box.?
4.
Open wire check (FUEL PUMP RLY CL- line):
Open wire check (FUEL PUMP RLY CL- line)
?1.
Turn the vehicle to the OFF (LOCK) mode.
?2.
Jump the SCS line with the HDS, and wait more than 1 minute.
?3.
Disconnect the following connector.
PCM connector A (50P)
?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
PGM-FI main relay 2: disconnected
PCM connector A (50P): disconnected
Test point 1
PGM-FI main relay 2 4P socket (female terminals) No. 4:
Remove the jumper wire from PCM connector A (50P).
?4.
Reconnect PCM connector A (50P).
?5.
Exit the SCS mode with the HDS.
?6.
Turn the vehicle to the ON mode, and measure the voltage between test points 1 and 2.
Test condition
Within 2 seconds after turning vehicle to ON mode
PGM-FI main relay 2: disconnected
Test point 1
PGM-FI main relay 2 4P socket (female terminals) No. 3:
Test point 2
PGM-FI main relay 2 4P socket (female terminals) No. 4:
Is there battery voltage?
YES
Go to step 7.
NO
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If the symptom/indication goes away and the PCM was substituted, replace the original PCM.?
7.
Determine possible failure area (FUEL PUMP RLY OUT line, GND line):
Determine possible failure area (FUEL PUMP RLY OUT line, GND line)
?1.
Turn the vehicle to the OFF (LOCK) mode.
?2.
Disconnect the following connector.
Fuel tank unit 4P connector
?3.
Reinstall PGM-FI main relay 2.
?4.
Turn the vehicle to the ON mode, and measure the voltage between test points 1 and 2.
Test condition
Within 2 seconds after turning vehicle to ON mode
Fuel tank unit 4P connector: disconnected
Test point 1
Fuel tank unit 4P connector (female terminals) No. 1:
Test point 2
Body ground
Is there battery voltage?
YES
Go to step 9.
NO
Go to step 8.
8.
Open wire check (FUEL PUMP RLY OUT line):
Open wire check (FUEL PUMP RLY OUT line)
?1.
Turn the vehicle to the OFF (LOCK) mode.
?2.
Remove PGM-FI main relay 2.
?3.
Connect terminals A and B with a jumper wire.
Terminal A
PGM-FI main relay 2 4P socket (female terminals) No. 1:
Terminal B
PGM-FI main relay 2 4P socket (female terminals) No. 2:
?4.
Turn the vehicle to the ON mode.
?5.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Fuel tank unit 4P connector: disconnected
PGM-FI main relay 2 :disconnected
PGM-FI main relay 2 4P socket No. 1 and No. 2: jumped
Test point 1
Fuel tank unit 4P connector (female terminals) No. 1:
Test point 2
Body ground
Is there battery voltage?
YES
The FUEL PUMP RLY OUT wire is OK. Replace PGM-FI main relay 2.?
NO
Repair an open in the FUEL PUMP RLY OUT wire between PGM-FI main relay 2 and the fuel tank unit.?
9.
Open wire check (GND line):
Open wire check (GND line)
?1.
Turn the vehicle to the OFF (LOCK) mode.
?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Fuel tank unit 4P connector: disconnected
Test point 1
Fuel tank unit 4P connector (female terminals) No. 3:
