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DTC P0108: BARO Sensor Input High: Testing

NOTE: Record freeze frame data. Check for service bulletins and on-line information.
  1. Connect scan tool to DLC-2. Start engine. Check BARO V PID. If PID is more than 4.8 volts, go to next step. If PID is 4.8 volts or less, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition off. Disconnect EGR boost sensor. Check EGR boost sensor connector terminals. If connectors are okay, go to next step. If connectors are faulty, repair as necessary and go to step  7 .
  3. Check continuity between EGR boost sensor harness connector terminal "A" (Brown/Yellow wire) and ground. See WIRING DIAGRAMS article. If continuity is present, go to next step. If continuity is not present, repair open in Brown/Yellow wire between PCM harness connector terminal No. 91 and EGR boost sensor harness connector terminal "A". See Figure . Go to step  7 .
  4. Disconnect PCM harness connector. PCM is mounted to passenger floor, behind glove box. Check PCM harness connector and PCM terminal No. 91. If terminal is okay, go to next step. If terminal is faulty, repair as necessary and go to step  7 .
  5. Check continuity between EGR boost sensor harness connector terminals "B" (Violet/Red wire) and "C" (Pink/Blue wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits. Go to step  7 .
  6. Check continuity between EGR boost sensor harness connector terminal "B" and PCM connector terminal No. 34. If continuity is present, go to next step. If continuity is not present, repair open in Violet/Red wire between EGR boost sensor harness connector terminal "B" and PCM harness connector terminal No. 34. See Figure . Go to next step.
  7. Reconnect all components. Turn ignition on. Using scan tool, clear DTC. Start engine. Ensure IAT PID is more than 50°F. Ensure BARO V PID is .2-4.8 volts. Recheck DTCs. If DTC P0108 is present, replace PCM and go to next step. If DTC P0108 is not present, go to next step.
  8. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If DTC is not present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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