Suzuki Grand Vitara Service Manual page 249

Step
6 Fuel pump relay drive signal check
1) Measure voltage within 2 second after ignition switch is
turned ON.
Is voltage 0 – 1 V?
7 Wire circuit check
1) Turn OFF ignition switch.
2) Detach fuel tank referring to "Fuel Tank Removal and
Installation: in Section 1G".
3) Disconnect connector from fuel pump.
4) Measure resistance between "PNK" wire terminal of fuel
pump connector and vehicle body ground.
Is resistance infinity?
8 Fuel pump circuit check
1) Connect service wire between "E23-15" terminal of ECM
connector and vehicle body ground.
2) Turn ON ignition switch, measure voltage between
"PNK" terminal at fuel pump connector and vehicle body
ground.
Is voltage 10 – 14 V?
9 Fuel pump circuit check
1) Turn OFF ignition switch.
2) Measure resistance between "BLK" wire terminal at fuel
pump connector and vehicle body ground.
Is resistance less than 5
www.CarGarage.ir
Action
Ω
?
www.CarGarage.ir
Engine General Information and Diagnosis:
Yes
Go to Step 7.
Go to Step 8.
Go to Step 9.
Faulty fuel pump.
1A-242
No
Substitute a known-
good ECM and recheck.
"PNK" wire is shorted to
ground.
"PNK" wire is open
circuit.
"BLK" wire is open
circuit.