Suzuki Wagon R Plus RB310 Service Manual page 328

Step
4 Check fuel pump relay.
1) Check fuel pump relay, referring to "Main
Relay, Fuel Pump Relay and Radiator Fan
Relay Inspection" in Section 6E2.
Is relay in good condition?
5 Check fuel pump relay drive signal.
1) Connect fuel pump relay to relay box.
2) Connect voltmeter between "E23-14" terminal
and vehicle body ground.
3) Measure voltage at after 3 second ignition
switch turned ON.
Is voltage 10 – 14 V?
6 Check fuel pump relay drive signal.
1) Measure voltage at within 3 second after igni-
tion switch turned ON.
Is voltage 0 – 1 V?
7 Check wire circuit.
1) Turn OFF ignition switch.
2) Detach fuel tank, referring to "Fuel Tank
Removal and Installation" in Section 6C.
3) Disconnect connector from fuel pump.
4) Measure resistance between "PNK" wire termi-
nal and vehicle body ground.
Is resistance infinity?
8 Check fuel pump circuit.
1) Turn OFF ignition switch.
2) Connect service wire between "E23-14" termi-
nal and vehicle body ground.
3) Turn ON ignition switch, measure voltage
between "PNK" terminal at fuel pump connec-
tor and vehicle body ground.
Is voltage 10 – 14 V?
9 Check fuel pump circuit.
1) Turn OFF ignition switch.
2) Check that there is continuity between "BLK"
terminal at fuel pump connector and vehicle
body ground.
Is there continuity?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-153
Action
[A]: Fig. 1 for Step 1
Yes
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 8.
Go to Step 9.
Faulty fuel pump.
No
Faulty relay.
"GRN" wire open cir-
cuit or shorted to
ground circuit.
Substitute a known-
good ECM and
recheck.
"PNK" wire shorted to
ground.
"PNK" wire open cir-
cuit.
"BLK" wire open cir-
cuit.