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Test TC-150A - Fuel Level Sending Unit Volts Too High

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see WIRING DIAGRAMS article.
  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on fuel level signal circuit at PCM connector terminal No. 23 (Dark Blue wire). If voltage is 9 volts or less, go to next step. If voltage is more than 9 volts, go to step 5).
  2. While observing scan tool voltmeter, wiggle wiring harness for fuel level sending unit. If voltage changed, repair wiring harness where wiggling caused problem to appear. Perform TEST VER-2A. If voltage did not change, go to next step.
  3. Condition to set trouble code is not present at this time. FUEL LEVEL SENDING UNIT VOLTS TOO HIGH DTC sets if PCM terminal No. 23 fuel level sensor signal circuit voltage goes more than a calculated value. Possible causes are: open fuel level sensor signal circuit, failed fuel level sending unit, instrument cluster printed circuit board failure or failed PCM. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-2A. If related wiring and connectors were repaired, perform TEST VER-2A.
  5. Disconnect fuel pump connector. Fuel pump connector is located at fuel tank. Connect a jumper wire between Dark Blue wire and Black wire at fuel pump connector (harness side). Using scan tool in voltmeter mode, check voltage of PCM connector terminal No. 23 (Dark Blue wire). If voltage is 1.5 volts or more, go to next step. If voltage is less than 1.5 volts, replace fuel level sending unit. Perform TEST VER-2A.
  6. Disconnect jumper wire. Reconnect jumper wire to chassis ground. Using scan tool in voltmeter mode, check voltage of PCM connector terminal 23 (Dark Blue wire). If voltage 1.5 volts or more, go to next step. If voltage is less than 1.5 volts, repair open Black wire (ground circuit) on fuel pump connector. Perform TEST VER-2A.
  7. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 23 (Dark Blue wire). If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2A. If resistance is 5 ohms or more, repair open Dark Blue wire from fuel pump connector to splice. Perform TEST VER-2A.
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