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DTC Troubleshooting

DIAGNOSIS PROCEDURE - DTC P0461 FUEL LEVEL SENSOR CIRCUIT RATIONALITY CHECK

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD) System Check.
Is the system check complete?		 - Go to Step 2. Go to "ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK ".
2
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Start the engine and operate the vehicle over the specified mileage.

Is any of the Diagnostic trouble Codes (DTCs) P0462, P0463 or P0501 set?		 250 km (155 mile) Go to applicable DTC TABLE . Go to Step 3.
3
  1. Turn the ignition OFF.
  2. Disconnect the fuel pump connector.
  3. Turn the ignition ON.
  4. Using a voltmeter, measure the fuel level signal voltage at the fuel level sensor connector terminal 1.

Is the voltage within the specified value?		 4--5 V Go to Step 4. Go to Step 5.
4
  1. Disconnect the Engine Control Module (ECM).
  2. Check the fuel level sensor ground circuit for an open between terminal 3 of the fuel sensor connector and terminal 51 of the ECM and repair as needed.

Is the repair complete?		 - Go to Step 10. Go to Step 6.
5 Using a voltmeter, measure the voltage at the ECM connector terminal 51 by back-probing the ECM connector.
Is the voltage within the specified value?		 4--5 V Go to Step 8. Go to Step 9.
6
  1. Remove the fuel pump from the fuel tank.
  2. Reconnect the fuel pump connector.
  3. Turn the ignition ON.
  4. Monitor the fuel level sensor parameter on the scan tool while moving the fuel sensor float from empty position to full position.
  5. Repeat procedure 4 several times.

Does the fuel level sensor vale on the scan tool increase and then decrease steadily when the float is moved?		 - Go to "DIAGNOSTIC AIDS ". Go to Step 7.
7
  1. Turn the ignition OFF.
  2. Replace the fuel pump assembly.

Is the repair complete?		 - Go to Step 10. -
8
  1. Turn the ignition OFF.
  2. Disconnect the ECM connector.
  3. Check the fuel level signal circuit fir an open or short to ground between terminal 17 and fuel pump harness connector terminal 1 and repair as needed.

Is the repair complete?		 - Go to Step 10. -
9
  1. Turn the ignition OFF.
  2. Replace the ECM.

Is the repair complete?		 - Go to Step 10. -
10
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the conditions for setting the DTC as specific in the supporting text.

Does the scan tool indicate that this diagnostic run and passed?		 - Go to Step 11. Go to Step 2.
11 Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?		 - Go to applicable DTC TABLE . System OK
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