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DTC B0159: Ambient Air Temperature Sensor

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing system check, go to next step.
  2. Connect a scan tool. Turn ignition on. Using scan tool, observe OUTSIDE AIR TEMP parameter in INSTRUMENT PANEL MODULE OPEN/SHORT data list. If scan tool indicates OUTSIDE AIR TEMP parameter is within 0.09-4.90 volts, inspect wiring and connectors for intermittent loose wires and/or poor connections and go to step  8. If scan tool indicates OUTSIDE AIR TEMP parameter is not within 0.09-4.90 volts, go to next step.
  3. Turn off ignition. Disconnect ambient air temperature sensor harness connector. Turn ignition on. Using scan tool, observe OUTSIDE AIR TEMP parameter in INSTRUMENT PANEL MODULE OPEN/SHORT data list. If scan tool indicates OUTSIDE AIR TEMP parameter is more than 4.90 volts, go to next step. If scan tool indicates OUTSIDE AIR TEMP parameter is 4.90 volts or less, go to step  5.
  4. Turn ignition off. Connect a 3-amp fused jumper wire between terminals "A" (Light Green/Black wire) and "B" (Yellow wire) of ambient air temperature sensor harness connector. See Figure. Turn ignition on. Using scan tool, observe OUTSIDE AIR TEMP parameter in INSTRUMENT PANEL MODULE OPEN/SHORT data list. If scan tool indicates OUTSIDE AIR TEMP parameter is 0.09 volts or less, check for loose wires and/or poor connections to ambient air temperature sensor. If wiring and connectors are okay, replace ambient air temperature sensor. SeeAMBIENT AIR TEMPERATURE SENSOR  under REMOVAL & INSTALLATION. Go to step  8. If scan tool indicates OUTSIDE AIR TEMP parameter is more than 0.09 volts, go to step  6.
  5. Check continuity between ground and terminal "A" (Light Green/Black wire) of ambient air temperature sensor harness connector. If continuity exists, repair short to ground in Light Green/Black wire between terminal B1 of Instrument Panel Module (IPM) and ambient air temperature sensor. Go to step  8. If continuity does not exist, check for loose wires and/or poor connections at IPM. If wires and connections are okay, replace IPM. See INSTRUMENT PANEL MODULE (IPM)  under REMOVAL & INSTALLATION. Go to step  8
  6. Check for voltage between ground and terminal "A" of ambient air temperature sensor. If voltage exists, repair short to voltage in Light Green/Black wire between terminal B1 of Instrument Panel Module (IPM) and ambient air temperature sensor. Go to step  8. If voltage does not exist, go to next step.
  7. Check continuity in Yellow wire between terminal "B" of right air temperature sensor and terminal B8 of IPM. See Figure. If continuity exists check for loose wires and/or poor connections at IPM. If wires and connections are okay, replace IPM. See INSTRUMENT PANEL MODULE (IPM)  under REMOVAL & INSTALLATION. Go to next step. If continuity does not exist, repair open or high resistance in Yellow wire. Go to next step.
  8. Use scan tool to clear DTCs. Operate vehicle and verify that DTCs do not reset. If DTCs reset, return to step  2. If DTCs do not reset, system is okay.
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