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Test TC-144A: 1/3 O2 Sensor Shorted To Ground

NOTE: This test applies to vehicles equipped with 8.0L medium-duty engine only. For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and wiring diagram, see WIRING DIAGRAMS article.
NOTE: 1/3 HO2S is located in post-catalyst position.
  1. DOWNSTREAM O2S VOLTAGE SHORTED TO GROUND DTC sets if Powertrain Control Module (PCM) senses Heated Oxygen Sensor (HO2S) voltage is less than 0.156 volt prior to HO2S heater test. Possible causes are: 1/3 HO2S output circuit shorted to another circuit, dirty or wet connections causing tracking in connector, defective HO2S, defective PCM, defective connector terminals or connector wires. Go to next step.
  2. If engine is warm, turn engine off and allow it to cool for at least 15 minutes. Turn ignition on, engine off. Go to next step.
  3. Using scan tool, read 1/3 HO2S voltage. If voltage is less than 0.16 volt, go to step 5)  . If voltage is 0.16 volt or more, go to next step.
  4. Wiggle wiring harness and connector going to 1/3 HO2S while monitoring voltage. If voltage changes when moving wiring harness, repair wiring harness and connector as necessary and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If voltage does not change when moving wiring harness, condition required to set DTC is not present at this time. See INACTIVE DTC CONDITION . Test is complete. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
  5. Turn ignition off. Disconnect 1/3 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If connector and terminals are okay, go to next step.
  6. Using scan tool, read 1/3 HO2S voltage. If voltage is 0.16 volt or more, replace 1/3 HO2S and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If voltage is less than 0.16 volt, go to next step.
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If connector and terminals are okay, go to next step.
  8. Using an external ohmmeter, check resistance between ground and 1/3 HO2S connector, signal circuit (Orange/Black wire). If resistance is less than 5 ohms, repair short to ground in 1/3 HO2S signal circuit and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If resistance is 5 ohms or more, go to next step.
  9. Wiggle wiring harness and connector at 1/3 HO2S while monitoring 1/3 HO2S resistance. If resistance changes while wiggling wiring harness, repair wiring harness for short to ground and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If resistance does not change, replace PCM and perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
NOTE: A break in test sequence occurs at this point. Sequence skips from TEST TC-144A to TEST TC-147A. No tests have been omitted.
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