Suzuki WagonR+ RB310 Service Manual page 1856

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 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".
Is fuel pump relay in good condition?
To other circuits
Ignition
"IG COIL"
switch
BLK
Main
relay
"FI"
Fuel pump relay
ACTION
GENERAL INFORMATION AND ENGINE DIAGNOSIS 6-1-93
Fuel pump
YES
Go to Step 2.
Fuel pump circuit
is in good
condition.
Go to Step 4.
"GRN" circuit open
or poor E21-21
connection.
If wire and
connection are
OK, substitute a
known-good ECM
(PCM) and
recheck.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to Step 3.
"PNK", "BLK" or
"BLK/RED" circuit
open or fuel pump
malfunction.
Replace fuel pump
relay.