Mazda X-5. Manual - part 9

 

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Mazda X-5. Manual - part 9

 

 

ON-BOARD DIAGNOSTIC 

01–02–13

01–02

P0133 Front HO2S circuit problem

• Front HO2S malfunction is detected by measuring of the average frequency of front HO2S signal, time required 

to pass from rich to lean, time required to pass from lean to rich. If the average frequency of front HO2S signal 
is more than the threshold value, the PCM determines that there is the front HO2S circuit problem.
MONITORING CONDITIONS

— HO2S heater, HO2S, and TWC Repair Verification Drive Mode

— Following conditions are met: 

• Engine speed is 1,750—3,500 rpm.

• Charging efficiency is 25—63 % (at engine speed 2,500 rpm).

• Engine coolant temperature is above 70 °C {158 °F}

• Front HO2S heater monitor is completed.

• Fuel system loop status is closed loop fuel control.

P0134 Front HO2S no activity detected

• The PCM monitors the front HO2S element impedance when the following conditions are met. If the front 

HO2S element impedance is 80 ohms or more, the PCM determines that front HO2S is not activated.
MONITORING CONDITIONS

— HO2S, HO2S heater and TWC Repair Verification Drive Mode

— Following conditions are met

• Time from engine start is above 30 s (ECT when engine start is 20 °C {68 °F}).

P0137 Rear HO2S circuit low input

• The PCM monitors input voltage from rear HO2S. If the input voltage from the rear HO2S is below 0.1 V for 

35.2 s the PCM determines that circuit input is low.
MONITORING CONDITIONS

— HO2S, HO2S heater and TWC repair verification drive mode

— Following conditions are met.

• Engine speed is above 1,500 rpm.

• Engine coolant temperature is above 70 °C {158 °F}.

• Fuel injector control in rear HO2S closed loop control.

• The PCM monitors the input voltage from the rear HO2S when the following conditions are met. Under the 

following monitoring conditions, if the input voltage from the rear HO2S does not even exceed 0.1 V   though 
the short term fuel trim is controlled up to 20.5 % for 9.6 s, the PCM determines that sensor circuit input is low.
MONITORING CONDITIONS

— HO2S, HO2S heater and TWC repair verification drive mode

— Following conditions are met for above 20.8 s.

• Engine speed is above 1,500 rpm.

• Engine coolant temperature is above 70 °C {158 °F}.

P0138 Rear HO2S circuit high input

• The PCM monitors input voltage from rear HO2S. If the input voltage from the rear HO2S sensor is above 1.2 

V for 0.8 s, the PCM determines that circuit input is high.

P0139 Rear HO2S circuit problem

• The PCM monitors the rich (0.4 V) to lean (0.3 V) response time of the rear HO2S. The PCM measures the 

response time when the following conditions are met. The PCM determines a rear HO2S response 
deterioration malfunction when the measured response time is more than the threshold value (80 ms) five 
consecutive times.
MONITORING CONDITIONS

— PCM Adaptive Memory Production, HO2S heater, HO2S, and TWC Repair Verification Drive Mode

— Following conditions are met: 

• During deceleration fuel cut

• Engine speed is above 500 rpm.

• Engine coolant temperature is above 70 °C {158 °F}.

• Rear HO2S output voltage ia above 0.4 V.

• The PCM monitors for a time-out malfunction (when rear HO2S remains above 0.3 V for longer than a 

specified period of time during fuel cut control). The PCM measures the amount of time from when the following 
conditions are met until the rear HO2S output voltage drops below 0.3 V. The PCM determines a rear HO2S 
time-out malfunction when the detected time is more than the threshold value (6 s) three consecutive times.
MONITORING CONDITIONS

— PCM Adaptive Memory Production, HO2S heater, HO2S, and TWC Repair Verification Drive Mode

— Following conditions are met:

• During deceleration fuel cut

• Engine speed is above 500 rpm.

• Engine coolant temperature is above 70 °C {158 °F}.

• Rear HO2S is activated (more than 0.55 V)

ON-BOARD DIAGNOSTIC 

01–02–14

P0140 Rear HO2S no activity detected

• The PCM monitors the input voltage from the rear HO2S when the following conditions are met. Under the 

following monitoring conditions, if the input voltage from the rear HO2S does not even exceed 0.55 V   though 
the short term fuel trim is controlled up to 20.5% for 9.6 s, the PCM determines that sensor circuit is not 
activated.
MONITORING CONDITIONS

— HO2S, HO2S heater and TWC repair verification drive mode

— Following conditions are met for above 20.8 s

• Engine speed is above 1,500 rpm.

• Engine coolant temperature is above 70 °C {158 °F}.

— Rear HO2S voltage is above 0.1 V

P0222 TP sensor No.2 circuit low input

• If PCM detects TP sensor No.2 voltage is to be below 0.1 V after the ignition switch to the ON position, the 

PCM determines that TP circuit has a malfunction.

P0223 TP sensor No.2 circuit high input

• If the PCM detects the TP sensor No.2 voltage is to be above 4.9 V after the ignition switch to the ON position, 

the PCM determines that the TP circuit has a malfunction.

P0300 Random misfire detected

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

cylinder. If change of interval time exceeds preprogrammed criteria, the PCM detects misfire in the 
corresponding cylinder. While the engine is running, the PCM counts 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 catalytic converter or affect emission performance, has occurred.

P0301, P0302, P0303, P0304 Cylinder No.1, No.2, No.3, No.4 misfire detected

• The PCM monitors CKP sensor input signal interval time. The PCM calculates the change of 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 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 catalytic converter or affect emission performance, has occurred.

P0327 KS circuit low input

• The PCM monitors input signal from the KS when the engine is running. If the input voltage is below 0.01 V the 

PCM determines that the KS circuit has a malfunction.

P0328 KS circuit high input

• The PCM monitors the input signal from the KS when the engine is running. If the input voltage is above 4.58 V 

the PCM determines that KS circuit has a malfunction.

P0335 CKP sensor circuit problem

• If the PCM does not receive the input voltage from the CKP sensor for 4.2 s while the MAF is 1.95 g/s {0.25 lb/

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

• If a malfunction is detected in the input pulse pattern from the CKP sensor.

P0340 CMP sensor circuit problem

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

receive the input voltage from the CMP sensor while the PCM receives the input signal from the CKP sensor, 
the PCM determines that the CMP circuit has a malfunction.

• If a malfunction is detected in the input pulse pattern from the CMP sensor.

P0401 EGR flow insufficient detected

• PCM monitors difference in intake manifold pressures when EGR is operated and when it is stopped. If the 

difference is too small, PCM determines that EGR flow insufficient.

P0403 EGR valve (stepping motor) circuit problem

• The PCM monitors the EGR valve control signal voltage and current. If the following conditions are met, the 

PCM determines that there is the EGR control circuit problem.

— The PCM turns the EGR valve off, but the voltage of the EGR valve control signal remains low.

— The PCM turns the EGR valve on, but the current of the EGR valve control signal remains high.

ON-BOARD DIAGNOSTIC 

01–02–15

01–02

P0421 Warm up catalyst system efficiency below threshold

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

number of inversions rear side performs while front side inverts for a specified number of times when the 
following monitoring conditions are met, PCM detects inversion ratio. If inversion ratio is below threshold, PCM 
determines that catalyst has deteriorated.
MONITORING CONDITION

— ECT: more than 70 

°C {158 °F}

— Calculated TWC temperature: more than 400 

°C {752 °F}

— Engine speed: 1,500—3,000 rpm

— LOAD: 15—48 % (at engine speed 2,000 rpm)

— Time with purge control system does not operate: more than 3 s

P0441 Evaporative emission control system incorrect purge flow

• PCM measures the purge line pressure, which is the vacuum when a following condition. If vacuum between 

charcoal canister and intake manifold does not reach the specified, PCM determines that the EVAP system has 
clogging.
MONITORING CONDITION

— Engine speed: 1,500—3,500 rpm

— Throttle opening angle: 11—20%

— Vehicle speed: 69.5—136 km/h {43.2—84.5 mph} [MT]/34.5—136 km/h {21.4—84.5 mph} [AT]

P0442 Evaporative emission control system leak detected (small leak)

• PCM measures the pump load current (EVAP line pressure) when the specified period has passed after EVAP 

system is sealed when monitoring conditions are met. If the load does not reach the reference current value 
within the specified period, PCM determines that the EVAP system has small leak.
MONITORING CONDITION

— The ignition switch is turned off.

— IAT: 4.4—35 

°C {40—95 °F}

— Battery voltage: 11 V or above

— Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above

— Fuel tank level: 15—85%

— Time from engine off : 5 h 10 min.

P0443 Purge solenoid valve circuit problem

• The PCM monitors the purge solenoid valve control signal voltage and current. If the following conditions are 

met, the PCM determines that there is the purge solenoid valve control circuit problem.

— The PCM turns the purge solenoid valve off, but the voltage of the purge solenoid valve control signal 

remains low.

— The PCM turns the purge solenoid valve on, but the current of the purge solenoid valve control signal 

remains high.

P0446 Change over valve (COV) (EVAP system leak detection pump) stuck close

• The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. When 

the decrease in pump load current is less than the specification after the reference current value has been 
obtained, the PCM determines change over valve (COV) in EVAP system leak detection pump has a 
malfunction.

P0455 Evaporative emission control system leak detected (gross leak)

• PCM measures the pump load current (EVAP line pressure) when the specified period has passed after EVAP 

system is sealed when monitoring conditions are met. If the load does not reach the reference current value 
within the specified period, PCM determines that the EVAP system has gross leak.
MONITORING CONDITION

— The ignition switch is turned off.

— IAT: 4.4—35 

°C {40—95 °F}

— Battery voltage: 11 V or above

— Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above

— Fuel tank level: 15—85%

— Time from engine off : 5 h 10 min.

ON-BOARD DIAGNOSTIC 

01–02–16

P0456 Evaporative emission control system leak detected (very small leak)

• PCM measure the pump load current (EVAP line pressure) when a specified period has passed after EVAP 

system is sealed when monitoring conditions are met. If the load does not reach the reference load value or 
rate of the load increase lower than the specified within a specified period, PCM determines that the EVAP 
system has very small leak.
MONITORING CONDITION

— The ignition switch is turned off.

— IAT: 4.4—35 

°C {40—95 °F}

— Battery voltage: 11 V or above

— Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above

— Fuel tank level: 15—85%

— Time from engine off : 5 h 10 min.

P0461 Fuel gauge sender unit range/performance problem

• The PCM monitors the fuel tank level difference before and after the PCM-calculated fuel consumption has 

reached more than 25 L {26.4 US qt, 22 Imp qt}. If the difference is less than 5%, the PCM determines that 
there is a fuel gauge sender unit range/performance problem.

P0462 Fuel gauge sender unit circuit low input

• The PCM monitors the fuel level signal and fuel gauge sender unit output voltage from the instrument cluster. If 

the PCM detects a fuel level or fuel gauge sender unit output voltage is too low, the PCM determines that the 
fuel gauge sender unit circuit has a malfunction.

P0463 Fuel gauge sender unit circuit high input

• The PCM monitors the fuel level signal and fuel gauge sender unit output voltage from the instrument cluster. If 

the PCM detects a fuel level or fuel gauge sender unit output voltage is too high, the PCM determines that the 
fuel gauge sender unit circuit has a malfunction.

P0480 Cooling fan relay No.1 control circuit malfunction

• The PCM monitors the cooling fan relay No.1 control signal voltage and current. If the following conditions are 

met, the PCM determines that there is the cooling fan relay No.1 control circuit problem.

— The PCM turns the cooling fan relay No.1 off, but the voltage of the cooling fan relay No.1 control signal 

remains low.

— The PCM turns the cooling fan relay No.1 on, but the current of the cooling fan relay No.1 control signal 

remains high.

P0481 Cooling fan relay No.2 control circuit malfunction

• The PCM monitors the cooling fan relay No.2 control signal voltage and current. If the following conditions are 

met, the PCM determines that there is the cooling fan relay No.2 control circuit problem.

— The PCM turns the cooling fan relay No.2 off, but the voltage of the cooling fan relay No.2 control signal 

remains low.

— The PCM turns the cooling fan relay No.2 on, but the current of the cooling fan relay No.2 control signal 

remains high.

P0482 Cooling fan relay No.3 control circuit malfunction

• The PCM monitors the cooling fan relay No.3 control signal voltage and current. If the following conditions are 

met, the PCM determines that there is the cooling fan relay No.3 control circuit problem.

— The PCM turns the cooling fan relay No.3 off, but the voltage of the cooling fan relay No.3 control signal 

remains low.

— The PCM turns the cooling fan relay No.3 on, but the current of the cooling fan relay No.3 control signal 

remains high.

P0500 VSS circuit problem
With ABS/DSC

• If an error in the wheel speed signal from the ABS/DSC HU/CM is detected by CAN when the following 

conditions are met:

— Neutral switch and clutch pedal position switch are OFF

— Load is above 40 %

— Engine speed is 2,000 rpm or above

— Brake switch is OFF

— Shift lever position (P, N, R position) (AT)

MT without ABS/DSC

• Vehicle speed signal from vehicle speed sensor is below 3.7 km/h {2.3 mph} when the following conditions 

are met: 

— Neutral switch and clutch pedal position switch are OFF

— Load is above 40 %

— Engine speed is 2,000 rpm or above

— Brake switch is OFF

P0505 Idle speed control system problem

• The PCM cannot control idle speed toward target idle speed while KOER self test.

 

 

 

 

 

 

 

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