DTC Troubleshooting

WARNING: This page is about a different car, the 2007 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.

DTC TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Was "Engine and Emission Control System Check" performed?	Go to Step 2.	Go to ENGINE AND EMISSION CONTROL SYSTEM CHECK .
2	Is DTC P0462 / P0463 detected?	Proceed to DTC P0462 / P0463: FUEL LEVEL SENSOR CIRCUIT LOW / HIGH .	Go to Step 3.
3	Do you have SUZUKI scan tool?	Go to Step 4.	Go to Step 5.
4	Change of fuel level check With ignition switch OFF, connect scan tool to DLC. With ignition switch ON leaving engine OFF, check "FUEL TANK LEVEL" (L1) displayed on scan tool. Add fuel of 18.5 liter (5 gal (US)) to fuel tank. With ignition switch ON leaving engine OFF, check "FUEL TANK LEVEL" (L2) displayed on scan tool. Is L2 higher than L1?	Intermittent trouble. If OK, substitute a known-good ECM and recheck.	Go to Step 6.
5	Fuel level sensor signal voltage check Turn ignition switch OFF position. Remove ECM from its bracket with ECM connectors connected. Turn ignition switch to ON position. Measure voltage (V1) between fuel level sensor circuit of ECM connector and vehicle body ground. Add fuel of 18.5 liter (5 gal (US)) to fuel tank. Measure voltage (V2) between fuel level sensor circuit of ECM connector and vehicle body ground. Is V2 lower than V1?	Intermittent trouble. If OK, substitute a known-good ECM and recheck.	Go to Step 6.
6	Fuel level sensor check Check fuel level sensor for performance referring to FUEL LEVEL SENSOR INSPECTION . Is it in good condition?	Go to Step 7.	Replace fuel level sensor.
7	Wire harness check Check fuel level sensor circuit for condition referring to Step 3 of DTC P0462 / P0463: FUEL LEVEL SENSOR CIRCUIT LOW / HIGH . Are they in good condition?	Substitute a known-good ECM and recheck.	Repair or replace.