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DTC Troubleshooting

WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
DTC DIAGNOSTIC 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 or P0463 displayed?  Go 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  Check fuel level sensor circuit 
  1. Connect SUZUKI scan tool to DLC with ignition switch turned OFF.
  2. Turn ON ignition switch and check fuel level displayed on scan tool.
  3. Add fuel of 3.7 liters (1 gal, 7.8 US pt.) to fuel tank and recheck fuel level.

Is fuel level in Step 3) higher than that in Step 2)? 		 Intermittent trouble or faulty ECM.
Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .		 Go to Step 6.
5  Check fuel level sensor circuit 
  1. Remove ECM cover.
  2. Turn ON ignition switch.
  3. Check voltage at terminal "E61-28" of ECM connector connected.
  4. Turn ignition switch OFF.
  5. Add fuel to tank by 3.7 lifters (1 gal, 7.8 US pt.)
  6. Turn ON ignition switch.
  7. Check voltage at terminal "E61-28".

Is voltage in Step 7) lower than that in Step 3)? 		 Intermittent trouble or faulty ECM.
Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .		 Go to Step 6.
6  Check fuel level sensor 
  1. Turn OFF ignition switch.
  2. Disconnect harness connector (A) between fuel pump harness and floor harness.
  3. Check for proper connection to fuel level sensor at "BLU/WHT" wire terminal of disconnected connector.
  4. If OK, check resistance of fuel level sensor.

Does resistance vary in less direction within 2 - 130 ohm range when fuel is added to fuel tank by 3.7 liters (1 gal, 7.8 US pt.)? 		 Go to Step 7. Check "BLU/WHT" and "BLK/YEL" wires between fuel pump harness connector (A) and (B) connections.
If OK, replace fuel level sensor.
7  Check wire harness 
  1. Remove ECM cover and disconnect ECM connectors.
  2. Check for proper connection at "E61-28" terminal of ECM connector.
  3. If OK, turn ON ignition switch.
  4. Check fuel level meter for operation as follows:
    • "E" (Empty) is displayed with disconnecting harness connector (A) between fuel pump harness and floor harness.
    • "F" (Full) is displayed when "BLU/WHT" wire terminal of harness connector (A) between fuel pump harness and floor harness is grounded at harness of ECM side.

Is check result as described? 		 Substitute a known-good ECM and recheck. "BLU/WHT" circuit wire is open or short.
If wires and connections are OK, replace combination meter.
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