Mazda 2002 Millenia Spezifikationen PDF herunterladen (Seite 108)

ON-BOARD DIAGNOSTIC

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Fuel System

Fuel trim system too lean (P0171)

• The PCM monitors short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) values during closed loop

fuel control. If fuel trim exceeds preprogrammed criteria, the PCM determines that the fuel system is too lean.

Fuel trim system too rich (P0172)

• The PCM monitors short fuel trim (SHRTFT) and long fuel trim (LONGFT) values during closed loop fuel

control. If fuel trim exceeds preprogrammed criteria, the PCM determines that the fuel system is too rich.

Misfire Monitor

Random misfire detection (P0300), Cylinder misfire detection (P0301, P0302, P0303, P0304)

• The PCM monitors CKP sensor input signal interval time. The PCM calculates the change of the interval time

for each cylinder. If the change 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 that

occurred at 200 crankshaft revolutions and 1,000 crankshaft revolutions and calculates misfire ratio for

each crankshaft revolution. If the ratio exceeds the preprogrammed criteria, the PCM determines that a misfire,

which can damage the catalytic converter or affect emission performance, has occurred.

Knock Sensor

Knock sensor circuit low input (P0327)

• The PCM monitors input signal from the knock sensor when the engine is running. If input voltage between

PCM terminals between 2P and 2S is below 0.9 V, the PCM determines that knock sensor circuit has a

malfunction.

Knock sensor circuit high input (P0328)

• The PCM monitors input signal from the knock sensor when the engine is running. If input voltage between

PCM terminals 2P and 2S is above 4.9 V, the PCM determines that knock sensor circuit has a malfunction.

Crankshaft Position (CKP) Sensor

CKP sensor circuit malfunction (P0335)

• If the PCM does not receive input voltage from the CKP sensor for 4.2 s while MAF is 2.0 g/s {0.26 lb/min.} or

above, the PCM determines that the CKP sensor circuit has a malfunction.

Camshaft Position (CMP) Sensor

CMP sensor circuit malfunction (P0340)

• The PCM monitors voltage from the CMP sensor when the engine is running. If the PCM does not receive input

voltage from the CMP sensor while the PCM receives input signal from the CKP sensor, the PCM determines

that CMP circuit has a malfunction.

EGR Valve

EGR valve (stepper motor) circuit malfunction (P0403)

• The PCM monitors input voltage from EGR valve. If voltage at PCM terminals 4E, 4H, 4K and/or 4N remains

low or high, the PCM determines that EGR valve circuit has a malfunction.

Catalyst System

Catalyst system efficiency below threshold (P0420)

• The PCM compares the number of front HO2S and rear HO2S inversions for a predetermined time. The PCM

monitors the number of inversions the rear side performs while the front side inverts for a specified number of

times when the following monitoring conditions are met. The PCM detects the inversion ratio. If inversion ratio

is below threshold, the PCM determines that the catalyst system has deteriorated.

 Engine speed 1,4103,000 rpm (MTX)

 Engine speed 1,2813,000 rpm (ATX)

 Calculated load 1550%(*

)

: Maximum calculated load value varies depending on engine speed

Purge Solenoid Valve

Evaporative emission control system purge control valve circuit malfunction (P0443)

• The PCM monitors input voltages from the purge solenoid valve. If voltage at the PCM terminal 4U remains low

or high, the PCM determines that the purge solenoid valve circuit has a malfunction.

Fan Control System

Fan control circuit malfunction (P0480)

• The PCM monitors input voltages from the fan control module. If voltage at the PCM terminal 1U remains low

or high, the PCM determines that the fan control circuit has a malfunction.

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