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DTC B1543: Oil Temperature Circuit (Open): Testing

  1. If IPC diagnostic system check was performed, go to next step. If IPC diagnostic system check was not performed, go to procedures in IPC DIAGNOSTIC SYSTEM CHECK  .
  2. Using scan tool, select IPC data display. Monitor oil temperature data. If scan tool displays a value less than 14°F (-10°C), go to next step. If scan tool does not display a value less than 14°F (-10°C), go to step 6).
  3. Disconnect oil temperature sensor connector. Refer to COMPONENT LOCATIONS  table. Connect a jumper wire between oil temperature sensor (harness side) connector terminals "A" (Black wire) and "B" (Dark Green/White wire). Using scan tool, select IPC data display. Monitor oil temperature data. If scan tool displays a value greater than 374°F (190°C), go to step 8). If scan tool does not display a value greater than 374°F (190°C), go to next step.
  4. Remove jumper wire. Using DVOM, check voltage between oil temperature sensor connector (harness side) terminal "B" (Dark Green/White wire) and ground. If reading is 4.5-5.5 volts, go to next step. If reading is not 4.5-5.5 volts, go to step 9).
  5. Using DVOM, check continuity between oil temperature sensor connector (harness side) terminal "A" (Black wire) and ground. If continuity exists, go to step 7). If continuity does not exist, go to step 10).
  6. Check for intermittent malfunction in oil temperature sensor circuit. See DIAGNOSTIC AIDS. If no problem is found, go to next step. If problem is found, repair as necessary. Go to step 12).
  7. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Wait 5 seconds and check for DTCs. If DTC B1543 is current, go to step 11). If DTC B1543 is not current, system is operating properly.
  8. Replace oil temperature sensor. Go to step 12).
  9. Check for open or short in circuit No. 357 (Dark Green/White wire) between IPC terminal A10 and oil temperature sensor terminal "B". If no problem is found, go to step 11). If problem is found, repair as necessary. Go to step 12).
  10. Check for open or short in circuit No. 470 (Black wire) between IPC terminal B8 and oil temperature sensor terminal "A". If no problem is found, go to next step. If problem is found, repair as necessary. Go to step 12).
  11. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. Go to next step.
  12. Turn ignition off. Reinstall all components and reconnect all connectors. Turn ignition on. Clear DTCs. Perform procedures in IPC DIAGNOSTIC SYSTEM CHECK  .
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