Mazda 6 Training Manual page 107

Throttle Position (TP) Sensor
Throttle position stuck closed (lower than epected)/open (higher than epected) (P0121)
• If the PCM detects that throttle valve opening angle is below 12.5% for 5 s after following conditions are met,
the PCM determines that TP is stuck closed:
— Engine coolant temperature above 80 ° ° ° ° C {176 ° ° ° ° F}
— MAF sensor signal above 32.0 g/s {4.2 lb/minutes}
• If the PCM detects that throttle valve opening angle is above 50% for 5 seconds after following conditions are
met, the PCM determines that TP is stuck open:
— Engine speed above 500 rpm
— MAF sensor signal 0 g/s {0.7 lb/min.}
TP circuit low input (P0122)
• If the PCM detects TP sensor voltage at the PCM terminal 2A is below 0.1 V after ignition key is turned to on,
the PCM determines that TP circuit has a malfunction.
TP circuit high input (P0123)
• If the PCM detects TP sensor voltage at the PCM terminal 2A is above 4.9 V after ignition key is turned to on,
the PCM determines that TP circuit has a malfunction.
Front Heated Oygen Sensor (HO2S)
Front HO2S stuck low (P0131)
• The PCM monitors input voltage from the front HO2S when the following conditions are met. If input voltage
from the sensor remains below 0.45 V for 41.2 s, the PCM determines that there is no front HO2S inversion.
— Engine speed is above 1,500 rpm.
— Engine coolant temperature is above 80 ° ° ° ° C {176° ° ° ° F}.
Front HO2S stuck high (P0132)
• The PCM monitors input voltage from the front HO2S when the following conditions are met. If input voltage
from the sensor remains above 0.45 V for 41.2 s, the PCM determines that there is no front HO2S inversion.
— Engine speed is above 1,500 rpm.
— Engine coolant temperature is above 80 ° ° ° ° C {178 ° ° ° ° F}.
Front HO2S circuit malfunction (P0133)
• The PCM monitors inversion cycle period, lean-to-rich response time and rich-to-lean response time of the
sensor. The PCM calculates the average of the inversion cycle period-specified inversion cycles, average
response time from lean-to-rich, and from rich-to-lean when following conditions are met. If any eceeds
threshold, the PCM determines that circuit has a malfunction.
— Drive mode 3
— Following conditions are met:
• Calculation load 14.8—59.4% (at 2,000 rpm.)
• Engine speed 1,410—4,000 rpm (MTX)
• Engine speed 1,190—4,000 rpm (ATX)
• Vehicle speed is above 3.76 km/h
• Engine coolant temperature is above -10 ° ° ° ° C {14 ° ° ° ° F}
• Front HO2S signal inversion cycle is above 10 cycles
Front HO2S circuit no activity detected (P0134)
• The PCM monitors input voltage from the front HO2S when the following conditions are met. If input voltage
from sensor never eceed 0.55 V for 83.2 s, the PCM determines that sensor circuit is not activated.
— Engine speed is above 1,500 rpm.
— Engine coolant temperature is above 80 ° ° ° ° C {176 ° ° ° ° F}.
Rear Heated Oygen Sensor (HO2S)
Rear HO2S circuit high input (P0138)
• The PCM monitors input voltage from the rear HO2S. If input voltage from the rear HO2S sensor is above 0.45
V for 6.4 s during deceleration fuel cut, the PCM determines that the circuit input is high.
Rear HO2S circuit no activity detected (P0140)
• The PCM monitors input voltage from the rear HO2S when the following conditions are met. If input voltage
from sensor never eceed 0.55 V for 30.4 s, the PCM determines that sensor circuit is not activated.
— Engine speed is above 1,500 rpm.
— Engine coolant temperature is above 80 ° ° ° ° C {176 ° ° ° ° F}.
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ON-BOARD DIAGNOSTIC