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Home >> Jeep >> 1996 >> Cherokee Classic, Part Time, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Tests W/Codes - 4.0L >> Diagnostic Trouble Code (DTC) Identification >> Test TC-150A - Fuel Level Sending Unit Volts Too High

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

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.
  1. Using scan tool, read fuel level sending unit voltage. If voltage is more than 4.7 volts, go to step 5). If voltage is 4.7 volts or less, go to next step.
  2. Wiggle connectors/harness from fuel tank sending unit to PCM and instrument cluster while observing scan tool display. If voltage changes while wiggling connectors/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 HIGH DTC sets if Powertrain Control Module (PCM) senses more than 4.7 volts for 2 seconds while ignition is on. Possible causes are: fuel level sensor open, defective fuel level sending unit, 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. Connect a jumper wire between fuel pump connector, fuel level sensor OBD-II signal circuit (Dark Blue/White wire) and sensor ground circuit (Black/Light Blue wire). Go to next step.
  7. Using scan tool, read fuel level sending unit voltage. If voltage is less than one volt, replace fuel pump module and perform TEST VER-2A. If voltage is one volt or more, go to next step.
  8. Move jumper wire from fuel pump connector, sensor ground circuit (Black/Light Blue wire) to engine ground. If voltage less than one volt, repair open sensor ground circuit and perform TEST VER-2A . if voltage is one volt or more go to next step.
  9. 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.
  10. Using an external ohmmeter, check resistance of fuel level sensor OBD-II signal circuit (Dark Blue/White wire) between PCM Gray connector and fuel pump module connector. If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A . If resistance is 5 ohms or more, repair open fuel level sensor OBD-II signal circuit and perform TEST VER-2A.
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