Fuel Line Pressure Under Load Inspection; Fuel Pump; Continuity Inspection (Fuel System) - Mazda B-Series 1997 Workshop Manual

FUEL SYSTEM (FOR 2 . 3 ~ 1 3 . 0 ~ I 4 . 0 ~ )
FT
Fuel Line Pressure Under Load Inspection
-
Warning
Before performing the following operation release
the fuel pressure from the fuel system to reduce
the possibility of injury or fire. (Refer to page
FT-149.)
1.
Install the SST.
2. Disconnect the vacuum hose from the pressure regulator
and plug it.
3. Start the engine and drive the vehicle under heavy
acceleration.
4. Verify that the fuel line pressure does not increase or
decrease more than 20 kPa
(0.2
kgf P cm2,
3
psi) during
heavy acceleration.
5. If not as specified, perform the following inspection:
Fuel vapor valve (Refer to page FT-163.)
6. If the fuel vapor valve is ok, replace tlhe fuel filter.
FUEL PUMP
If the fuel pump monitor signal circuit has an open or
short, Diagnostic Trouble Code No. P0230, PO231 or
MF1038-A 6BUOFT-202
PO232 is output.
If the circuit is shorted, the fuel pump will not operate and
the engine will stall and not restart.
5 ~ ~ 0 ~ 3 - 1 4 3
lnspection
1. Verify that the battery is fully charged. (Refer to Sec-
tion G.)
2. Verify that fuel tank unit connector is securely connected.
3. Key ON, engine off.
4. Connect SST (NGS) to the data link connector and select
Active Command Mode.
5 . Select OUTPUTTEST MODE. Press MODE to change to
the "ALL ON" mode, and press START to run fuel pump.
6. Listen to the fuel pump to verify operation.
7. Turn the relay off.
8.
If the fuel pump does not operate, perform the following
inspections:
Continuity inspection
1. Disconnect the fuel tank unit connector.
2. Check for continuity between the fuel tank unit power and
ground terminals.
3. If continuity does not exist, replace tlie fuel pump.