LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 1997 >> Wrangler SE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.5L >> Trouble Code Tests >> Test TC-149A - Fuel Level Sending Unit Volts Too Low

Test TC-149A - Fuel Level Sending Unit Volts Too Low

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.
  1. Using scan tool, read fuel level sending unit voltage. If voltage is less than 0.2 volt, go to step 5). If voltage is not as specified, go to next step.
  2. Wiggle connectors and harness at fuel pump module while observing scan tool display. If voltage changes while wiggling connectors and harness, repair connector or harness that caused voltage change and perform TEST VER-2A. If voltage does not change, go to next step.
  3. Condition required to set DTC is not present at this time. FUEL LEVEL SENDING UNIT VOLTAGE TOO LOW DTC sets if Powertrain Control Module (PCM) senses less than 0.2 volt for 2 seconds while ignition is on. Possible causes are: fuel level sensor signal shorted to ground, defective fuel level sending unit, loss of ignition switch output voltage, defective instrument cluster circuit board, defective PCM, defective connector terminals or connector wires. Go to next step.
  4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, test is complete. Perform TEST VER-2A.
  5. Disconnect fuel pump module connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary. If connector and terminals are okay, go to next step.
  6. Using scan tool, read fuel level sending unit voltage. If voltage is more than 4.5 volts, replace fuel pump module and perform TEST VER-2A. If voltage is not as specified, go to next step.
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A. If connectors and terminals are okay, go to next step.
  8. Using an external ohmmeter, check resistance between ground and PCM Gray connector, fuel level sensor OBD-II signal circuit (Dark Blue/Light Green wire). If resistance is less than 5 ohms, repair short to ground in fuel level sensor OBD-II signal circuit and perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
  9. Check resistance between PCM Gray connector, fuel level sensor OBD-II signal circuit (Dark Blue/Light Green wire) and PCM Black connector, sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair fuel level sensor OBD-II signal circuit for a short to sensor ground circuit and perform TEST VER-2A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-2A.
scientia non olet · About LEMON Manuals