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Home >> Jeep >> 1998 >> Wrangler SE, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Engine Performance >> Self-Diagnostic Tests >> Test TC-151A: Fuel Level Unit No Change Over Miles

Test TC-151A: Fuel Level Unit No Change Over Miles

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and wiring diagram, see WIRING DIAGRAMS article.
  1. Ensure fuel tank is 1/4 full. Using scan tool, read and note fuel level sending unit voltage. If voltage is less than 0.1 volt on AB body or less than 0.2 volt on all other bodies, perform TEST TC-149A: FUEL LEVEL SENDING UNIT VOLTS TOO LOW . If voltage is more than 4.37 volts on AB body or more than 4.7 volts on all other bodies, perform TEST TC-150A: FUEL LEVEL SENDING UNIT VOLTS TOO HIGH . Go to next step.
  2. If voltage is not 2.50-4.37 volts on AB body or 2.5-4.7 volts on all other bodies, go to step 6)  . If voltage is as specified, add 5 gallons of fuel to fuel tank. Go to next step.
  3. Using scan tool, read fuel level sending unit voltage. If voltage does not decrease by at least 0.2 volt, replace fuel pump module and perform TEST VER-2A: ROAD TEST VERIFICATION . If voltage decreases by at least 0.2 volt, go to next step.
  4. Condition required to set DTC is not present at this time. FUEL LEVEL UNIT NO CHANGE OVER MILES DTC sets if Powertrain Control Module (PCM) does not sense fuel level signal circuit voltage change a calibrated amount over a calculated number of miles. Possible causes are: open sensor signal circuit, defective fuel level sending unit, defective PCM, or defective connections or wiring. Go to next step.
  5. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If wiring and connectors are okay, test is complete. Perform TEST VER-2A: ROAD TEST VERIFICATION .
  6. If voltage is not 0.2-1.0 volt on TJ, XJ and ZJ bodies, or 0.1-2.5 volts on all other bodies, go to step 8)  . If voltage is as specified, go to next step.
  7. Remove at least 5 gallons of fuel from fuel tank. Using scan tool, read fuel level sending unit voltage. If voltage does not increase by at least 0.2 volt, replace fuel pump module and perform TEST VER-2A: ROAD TEST VERIFICATION . If voltage increases by at least 0.2 volt, go to next step.
  8. Condition required to set DTC is not present at this time. FUEL LEVEL SENDING UNIT NO CHANGE OVER MILES DTC sets if Powertrain Control Module (PCM) does not sense fuel level signal circuit voltage change a calibrated amount over a calculated number of miles. Possible causes are: open sensor signal circuit, defective fuel level sending unit, defective PCM, or defective connections or wiring. Go to next step.
  9. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If wiring and connectors are okay, test is complete. Perform TEST VER-2A: ROAD TEST VERIFICATION .
NOTE: A break in test sequence occurs at this point. Sequence skips from TEST TC-151A to TEST TC-153A. No tests have been omitted.
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