Suzuki GRAND VITARA Owner's Manual page 198

1A-143 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions For DTC Troubleshooting: ".
Step
1 Was "Engine and Emission Control System Check"
performed?
2 Do you have SUZUKI scan tool?
3 Fuel level sensor output signal check with SUZUKI scan
tool
1) Connect SUZUKI scan tool to DLC with ignition switch
turned OFF.
2) Turn ON ignition switch and check fuel level displayed
on SUZUKI scan tool.
Is 100% displayed?
4 Fuel level sensor output signal check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connector
connected.
3) Turn ON ignition switch and measure voltage between
"E23-24" terminal of ECM connector and vehicle body
ground.
Is voltage about 3.5 V or less?
5 Fuel level sensor output signal circuit check
1) Disconnect fuel pump connector referring to "Fuel Tank
Removal and Installation: in Section 1G".
2) Disconnect connectors from ECM with ignition switch
turned OFF.
3) Measure resistance between "E23-24" terminal of ECM
connector and vehicle body ground.
Is resistance infinity?
6 Fuel level sensor output signal circuit check
1) Connect connectors to ECM.
2) Measure voltage between "E23-24" terminal of ECM
connector and engine ground with ignition switch turned
ON.
Is voltage 10 – 14 V?
7 Fuel level sensor check
1) Check fuel level sensor (main and sub) referring to "Fuel
Level Sensor Inspection: in Section 9C"
Is it in good condition?
Action Yes
Go to Step 2.
Go to Step 3.
Go to Step 5.
Go to Step 5.
Go to Step 6.
Go to Step 7.
"YEL/GRN" wire
between main fuel lever
sensor and sub fuel
level sensor is shorted
to ground circuit. If wire
is OK, substitute a
known-good ECM and
recheck.
No
Go to "Engine and
Emission Control
System Check: ".
Go to Step 4.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection: in Section
00".
"YEL/RED" wire is
shorted to ground
circuit.
Substitute a known-
good ECM and recheck.
Faulty fuel level sensor.