Mazda 6 Workshop Manual page 36

P0301, P0302, P0303, P0304 Cylinder No.1/No.2/No.3/No.4 misfire detection
• The PCM monitors the CKP sensor input signal interval time. The PCM calculates the deviation of the interval
time for each cylinder. If the deviation of interval time exceeds the preprogrammed criteria, the PCM detects a
misfire in the corresponding cylinder. While the engine is running, the PCM counts the number of misfires and
calculates misfire ratio for each crankshaft revolution. If the ratio exceeds the preprogrammed criteria, the PCM
determines that a misfire, which can affect emission performance, has occurred.
P0336 CKP sensor range/performance problem
• The PCM monitors input signal from the CKP sensor while the engine is running. If the input signal from the
CKP sensor does not correspond with the proper pulse number, the PCM determines CKP sensor performance
problem.
P0337 CKP sensor circuit low input
• The PCM monitors the input signal from the CKP sensor and the CMP sensor while the engine is running. If the
input signal from the CKP sensor is not input while the PCM detects 28 pulses from the CMP sensor, the PCM
determines that there is a malfunction in the CKP sensor circuit.
P0341 CMP sensor range/performance problem
• The PCM monitors the input signal from the CMP sensor while the engine is running. If the input signal from the
CMP sensor does not correspond with the proper pulse number, the PCM determines CMP sensor
performance problem.
P0342 CMP sensor circuit low input
• The PCM monitors the input signal from the CMP sensor and the CKP sensor while the engine is running. If the
input signal from the CMP sensor is not input while the PCM detects 255 pulses from the CKP sensor, the
PCM determines that there is a malfunction in the CMP sensor circuit.
P0401 EGR flow insufficient detected
• The PCM monitors the difference between the target air amount and intake air amount while the EGR system is
operating. If the difference between the target air amount and the intake air amount is less than the threshold,
the PCM determines that there is a malfunction in the EGR system.
P0402 EGR flow excessive detected
• The PCM monitors the difference between the target air amount and intake air amount while the EGR system is
operating. If the difference between the target air amount and the intake air amount is more than the threshold,
the PCM determines that there is a malfunction in the EGR system.
P0404 EGR valve stuck
• The PCM monitors the input signal from the EGR valve position sensor while the EGR system is operating. If
the output voltage difference is less than threshold when the EGR flow amount changes, the PCM determines
that there is a malfunction in the EGR valve.
P0406 EGR valve position sensor circuit high input
• The PCM monitors the input signal from the EGR valve position sensor. If the voltage from the EGR valve
position sensor is more than 4.75 V, the PCM determines that there is a malfunction in the EGR valve position
sensor circuit.
P0489 EGR solenoid valve (vacuum) control circuit low input
• The PCM monitors the output signal to the EGR solenoid valve (vacuum). If the EGR solenoid valve (vacuum)
voltage is low even if the EGR solenoid valve (vacuum) is off, the PCM determines that there is a malfunction in
the intake shutter solenoid valve control circuit.
P0490 EGR solenoid valve (vacuum) control circuit high input
• The PCM monitors the output signal to the EGR solenoid valve (vacuum). If the EGR solenoid valve (vacuum)
voltage is high even if the EGR solenoid valve (vacuum) is on, the PCM determines that there is a malfunction
in the EGR solenoid valve (vacuum) control circuit.
P0500 Vehicle speed signal problem
• The PCM monitors the CAN input signal from the DSC HU/CM. If the input signal is not correct, the PCM
determines that there is a CAN input signal.
P0504 Brake switch signal correlation malfunction
• The PCM monitors the input signal from brake switch 1 and brake switch 2 while the engine is running. The
PCM determines the brake switch signal correlation malfunction if the input signal from brake switch 1 brake
switch 2 is as follows:
— Brake switch 1 is on and brake switch 2 is off.
— Brake switch 1 is off and brake switch 2 is on.
P0512 Engine switch circuit high input
• The PCM monitors the engine speed and the starter signal. If the engine speed is more than 700 rpm and the
starter switch ON signal is input, the PCM determines that there is a malfunction in the starter switch circuit.
P0562 Battery voltage low input
• The PCM monitors the battery voltage. If the battery voltage is less than 8 V, the PCM determines that there is
a malfunction in the battery and the battery signal system.
P0563 Battery voltage high input
• The PCM monitors the battery voltage. If the battery voltage is more than 16 V, the PCM determines that there
is a malfunction in the battery charging system.
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ON-BOARD DIAGNOSTIC