Diesel Engines Engine
• At low exhaust gas temperatures the PCM controls the heater element by a large duty
cycle, so that the required operating temperature is reached quickly.
• At high exhaust gas temperatures the PCM controls the heater element by a small duty
cycle, so that no heating takes place.
• The PCM controls the heater element by a duty signal 0 V/12 V.
NOTE: After replacing the HO2S, its adaptation values in the PCM must be reset (refer to
the section “Control System, Service and Repair”).
DPF Indicator Light
• The DPF indicator light is located in the instrument cluster and serves to alert the driver
to a malfunction in the DPF system. During normal operation the DPF indicator light
illuminates when the ignition is on and is extinguished after a few seconds. If the DPF
indicator light illuminates or flashes during driving, then a fault has been detected.
M6FL_01087
01-72 Service Training Mazda6 Facelift
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