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DTC B1317: In-Car Air Temperature Sensor: Testing

  1. If body control system diagnostic check has been performed, go to next step. If body control system diagnostic check has not been performed, perform body control system diagnostic check. See BODY CONTROL SYSTEM DIAGNOSTIC CHECK  under SYSTEM TESTS.
  2. Turn ignition switch to OFF position. Disconnect in-car air temperature sensor, located in center front of vehicle, near hood latch. Using DVOM, measure voltage between sensor connector terminals "A" (Light Green/Black wire) and "B" (Yellow wire). If reading is 5 volts, go to next step. If reading is not 5 volts, go to step  7 .
  3. Turn ignition switch to OFF position. Reconnect sensor connector. Turn ignition switch to ON position. Using scan tool, clear DTCs. Start engine. Check DTCs. If DTC resets, go to next step. If DTC does not reset, problem is intermittent. Check for intermittent or poor connection.
  4. Connect scan tool to Data Link Connector (DLC). Display in-car air temperature sensor data. Start engine and allow to idle. Disconnect in-car air temperature sensor connector. In-car air temperature sensor reading should increase. Reconnect in-car air temperature sensor connector. If in-car air temperature sensor voltage reading decreases, check for intermittent or poor connection. If in-car air temperature sensor voltage reading does not decrease, go to step  6 .
  5. Check for open or short in Dark Green wire between in-car air temperature sensor and IPM connector terminal B1. See Figure . If circuit is faulty, repair as necessary. If circuit is okay, replace IPM. See INSTRUMENT PANEL INTEGRATION MODULE (IPM)  under REMOVAL & INSTALLATION. After replacing module, go to step  13 .
  6. Replace in-car air temperature sensor. After replacing ambient air temperature sensor, go to step  13 .
  7. Using DVOM, measure voltage between in-car air temperature sensor connector terminal "A" (Dark Green wire) and ground. If reading is 5 volts, go to next step. If reading is not 5 volts, go to step  10 .
  8. Use scan tool to check for HVAC related DTCs. If all HVAC related DTCs are present, go to next step. If all HVAC related DTCs are not present, go to step  12 .
  9. Repair open or short in Yellow wire between sensor terminal "D" and IPM connector terminal B8. After repairs, go to step  13 .
  10. Using DVOM connected to ground, backprobe and measure voltage at IPM terminal B4 (Dark Green wire). If reading is 5 volts, go to next step. If reading is not 5 volts, go to step  5 .
  11. Repair open in Dark Green wire. After repairs, go to step  13 .
  12. Repair open in Yellow wire. After repairs, go to next step.
  13. Reconnect all components and connectors. Turn ignition switch to ON position. Using scan tool, clear DTCs. After clearing DTCs, perform body control system diagnostic check. See BODY CONTROL SYSTEM DIAGNOSTIC CHECK  under SYSTEM TESTS.
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