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DTC P1493-B: AMBIENT TEMP SENSOR VOLTAGE TOO HIGH Chrysler LHS II

Testing & Diagnostics ~291 words

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.

  1. Disconnect Body Control Module (BCM) (Bone) 12-pin connector. Using an ohmmeter, check resistance of sensor ground circuit between BCM connector terminal No. 10 and ground. See «BCM CONNECTOR WIRE IDENTIFICATION»(ref-576-S03407856672000030800000) table. If resistance is 500,000 ohms or more, go to next step. If resistance is less than 500,000 ohms, repair partial short to ground on ground circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
  2. Using an ohmmeter, check resistance of ambient temperature sensor signal circuit between BCM connector terminal No. 5 and ground. See «BCM CONNECTOR WIRE IDENTIFICATION»(ref-576-S03407856672000030800000) table. If resistance is 50,000 ohms or more, go to next step. If resistance is 50,000 ohms or less, repair partial short to ground on ambient temperature sensor signal circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
  3. Using an ohmmeter, check resistance between BCM connector terminals No. 5 and 10. See «BCM CONNECTOR WIRE IDENTIFICATION»(ref-576-S03407856672000030800000) table. If resistance is 50,000 ohms or more, go to next step. If resistance is less than 50,000 ohms, repair short to ground on ambient temperature sensor signal circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
  4. Using an ohmmeter, check resistance of ambient temperature sensor signal circuit between ambient temperature sensor connector and BCM connector terminal No. 5. See «AMBIENT TEMPERATURE SENSOR CONNECTOR WIRE IDENTIFICATION»(ref-576-S05937833562000030800000) table and «BCM CONNECTOR WIRE IDENTIFICATION»(ref-576-S03407856672000030800000) table. If resistance is less than 5 ohms, replace BCM. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) . If resistance is 5 ohms or more, repair open ambient temperature sensor signal circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .

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