Mazda 6 Training Manual page 106

Rear HO2S heater circuit high (P0038)
• The PCM monitors the rear HO2S heater control signal at the PCM terminal 4D. If the PCM turns the rear
HO2S heater on but rear HO2S heater circuit has high voltage, the PCM determines that the rear HO2S heater
circuit has a malfunction.
MAF Sensor
MAF sensor inconsistent with TP sensor (P0101)
• The PCM compares actual input signal from MAF sensor with epected input signal from MAF sensor
(calculated by input voltage from throttle position sensor or engine speed).
— If mass intake air flow amount is below 5.0 g/sec. {0.66 lb/min.} for 5 s and throttle opening angle is
above 50 % with engine running, the PCM determines that detected mass intake air flow amount is too low.
— If mass intake air flow amount is above 96.5 g/sec. {12.7 lb/min.} for 5 s and engine speed is below 2,000
rpm with engine running, the PCM determines that detected mass intake air flow amount is too high.
MAF sensor circuit high input (P0102)
• The PCM monitors input voltage from MAF sensor when engine running. If input voltage at the PCM terminal
1P is below 0.21 V, the PCM determines that MAF circuit has a malfunction.
MAF sensor circuit high input (P0103)
• The PCM monitors input voltage from MAF sensor when engine running. If input voltage at the PCM terminal
1P is above 4.9 V, the PCM determines that MAF circuit has a malfunction.
MAP Sensor
MAP sensor circuit low input (P0107)
• The PCM monitors input voltage from MAP sensor when intake air temperature is above 10 ° ° ° ° C {50 ° ° ° ° F}. If input
voltage at the PCM terminal 1J is below 0.1 V, the PCM determines that MAP sensor circuit has a malfunction.
MAP sensor circuit high input (P0108)
• The PCM monitors input voltage from MAP sensor when intake air temperature is above 10 ° ° ° ° C {50 ° ° ° ° F}. If input
voltage at the PCM terminal 1J is above 4.9 V, the PCM determines that MAP sensor circuit has a malfunction.
Intake Air Temperature (IAT) Sensor
IAT sensor circuit performance problem (P0111)
• If intake air temperature is higher than engine coolant temperature by 40 ° ° ° ° C {104 ° ° ° ° F} with ignition key on, the
PCM determines that there is a IAT sensor performance problem.
IAT sensor circuit low input (P0112)
• The PCM monitors input voltage from IAT sensor. If input voltage at the PCM terminal 2E is below 0.2 V, the
PCM determines that IAT sensor circuit has a malfunction.
IAT sensor circuit high input (P0113)
• The PCM monitors input voltage from IAT sensor. If input voltage at the PCM terminal 2E is above 4.8 V, the
PCM determines that IAT sensor circuit has a malfunction.
Engine Coolant Temperature (ECT) Sensor
ECT circuit low input (P0117)
• The PCM monitors ECT sensor signal at the PCM terminal 1M. If the PCM detects ECT sensor voltage below
0.2 V, the PCM determines that the ECT sensor circuit has a malfunction.
ECT circuit high input (P0118)
• The PCM monitors ECT sensor signal at the PCM terminal 1M. If the PCM detects ECT sensor voltage above
4.6 V, the PCM determines that the ECT sensor circuit has a malfunction.
Ecessive time to enter closed loop fuel control (P0125)
• The PCM monitors ECT sensor signal at the PCM terminal 1M after engine is started while the engine is cold.
If engine coolant temperature does not reach the epected temperature for specified period, the PCM
determines that it has taken an ecessive amount of time for the engine coolant temperature to reach the
temperature necessary to start closed-loop fuel control.
ON-BOARD DIAGNOSTIC
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