Table B-2 Fuel Pump And Its Circuit Check - Suzuki Swift User Manual

6-98 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)

TABLE B-2 FUEL PUMP AND ITS CIRCUIT CHECK

Main
fuse
INSPECTION
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check Fuel Pump Control System for Operation. See Fig. 1.
Is fuel pump heard to operate for 2 sec. after ignition switch
ON?
3 Check Fuel Pump for Operation.
1) Remove fuel pump relay from relay box with ignition
switch OFF.
2) Check for proper connection to relay at each terminals.
3) If OK, using service wire, connect terminals E28-1 and
E28-2 of relay connector. See Fig. 2.
CAUTION: Check to make sure that connection is
made between correct terminals. Wrong connection
can cause damage to ECM (PCM), wire harness, etc.
Is fuel pump heard to operate at ignition switch ON?
4 Check Fuel Pump Relay for Operation.
1) Check resistance between each two terminals of fuel
pump relay. See Fig.3.
Between terminals "1" and "2": Infinity
Between terminals "3" and "4": 100 – 120 Ω
2) Check that there is continuity between terminals "1" and
"2" when battery is connected to terminals "3" and "4". See
Fig. 4.
Is fuel pump relay in good condition?
To other circuits
Ignition
switch
Main
relay
Fuel pump relay
ACTION
Fuel pump
YES
Go to Step 2. Go to "ENGINE
DIAG. FLOW
TABLE".
Fuel pump circuit Go to Step 3.
is in good
condition.
Go to Step 4. "P", "B" or "W/Bl"
circuit open or fuel
pump malfunction.
"P/W" circuit open Replace fuel pump
or poor C02-21 relay.
connection.
If wire and
connection are
OK, substitute a
known-good ECM
(PCM) and
recheck.
NO