DTC Detection Logic
WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to "DTC LOGIC - U1000 CAN COMM CIRCUIT " or "DTC LOGIC - U1010 CONTROL UNIT (CAN) ".
- If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [-30°C (-22°F)] and adjusts the temperature control warmer.
DTC DETECTION LOGIC CHART
| DTC | Items (CONSULT-III screen terms) | Diagnostic item is detected when... | Possible cause |
|---|---|---|---|
| B257B | AMB TEMP SEN (SHORT) | Detected temperature at ambient sensor 55°C (131°F) or more |
|
| B257C | AMB TEMP SEN (OPEN) | Detected temperature at ambient sensor -30°C (-22°F) or less |