Detection Condition
WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
- DTC P0112 indicates IAT sensor is less than self-test minimum of 0.2 volt or 250°F (121°C).
- DTC P0113 indicates IAT sensor is more than the self-test maximum of 4.6 volts or -58°F (-50°C).
- DTC P0117 indicates ECT sensor is less than self-test minimum of 0.2 volt or 250°F (121°C).
- DTC P0118 indicates ECT sensor is more than self-test maximum of 4.6 volts or -58°F (-50°C).
- DTC P0125 indicates ECT sensor has not achieved the required temperature level to enter closed loop operating conditions within a specified amount of time after engine start.
- DTC P1112 indicates IAT sensor signal was intermittent during Comprehensive Component Monitor.
- DTC P1116 indicates ECT sensor signal is out of self-test range (0.3-3.7 volts).
- DTC P1117 indicates ECT circuit was intermittently open or shorted while engine was running.
- DTC P1285 indicates an engine overheat condition was sensed by CHT sensor.
- DTC P1288 indicates CHT sensor is out of self-test range (engine not at operating temperature).
- DTC P1289 and P1290 indicates CHT sensor circuit malfunction (open or short).
- DTC P1299 indicates an engine overheat condition was detected by CHT sensor and a Failure Mode Effects Management (FMEM) strategy (fail safe cooling) was activated to cool engine.
Engine must be at normal operating temperature to pass KOEO and KOER self-tests. Ambient temperature must be more than 50°F (10°C) to receive acceptable input from IAT sensor. IAT, ECT and CHT sensors are thermistor type (passive) sensors. PCM uses IAT input as a correction factor in calculation of fuel, spark and MAF. PCM also uses ECT and CHT sensors as inputs. On all sensors, resistance changes with temperature. Resistance decreases with temperature increase, and increases with temperature decrease.