Contents: 1 type of driving cycle ⇓ 2 type of driving cycle ⇓ Synchronization of the camshaft…⇓ Oxygen sensor heater ⇓ Intake Manifold Pressure Sensor ⇓ Intake Manifold Pressure Sensor ⇓ Intake Air Temperature Sensor…⇓ Throttle Position Sensor ⇓ Fuel system ⇓ Misfire Monitoring ⇓ Knock sensor ⇓ Exhaust gas recirculation valve ⇓ Neutralization system ⇓ Purge solenoid valve ⇓ Cooling Fan Control System ⇓ Neutral switch ⇓ Variable Intake Duty (VAD) Solenoid…⇓ PCM Block ⇓ Air mixing control system ⇓ Barometric pressure sensor ⇓ Generator ⇓
Submitting the test results of the continuous monitoring system (unfinished code) (mode 07)
1 type of driving cycle
If faults are detected in the first drive cycle, pending codes will be stored in the PCM memory, just like diagnostic codes.
After the pending codes are stored in memory, if the PCM determines that the system is OK for any future drive cycle, the PCM clears the pending codes.
2 type of driving cycle
The faulty system code is stored in the PCM memory during the first drive cycle. If the fault is not detected during the second drive cycle, the PCM assumes that the system has returned to normal or that the fault information was erroneous and clears the pending code. If the fault is also detected during the second drive cycle, the PCM assumes that the system has failed and stores the pending and diagnostic codes.
After the pending codes are stored in memory, if the PCM determines that the system is OK for any future drive cycle, the PCM clears the pending codes.
Synchronization of the camshaft position
Camshaft Position Actuator Circuit Malfunction (P0010)
The PCM monitors the oil control valve voltage. If the PCM detects that the valve control voltage (calculated from the control oil valve) - above or below the threshold voltage (calculated from the voltage of the positive terminal of the battery), the PCM determines that the oil control valve circuit is faulty.
Excessive Camshaft Position Advance (P0011)
The actual advance of the valve opening or closing timing is 30° from the target valve opening or closing timing at the maximum retardation command.
Excessive Camshaft Position Retardation (P0012)
The actual excess of the valve opening or closing timing lag is 5° from the target valve opening or closing timing within 5 s when the valve is controlled within the feedback range.
Oxygen sensor heater
Front HO2S Heater Circuit Low Input (P0031)
The PCM monitors the front heated oxygen sensor heater control signal at PCM terminal 4A. If the PCM turns the front heated oxygen sensor heater off and the front heated oxygen sensor heater circuit has a low voltage, the PCM determines that the heater circuit is faulty.
Front HO2S Heater Circuit High Input (P0032)
The PCM monitors the front heated oxygen sensor heater control signal at PCM terminal 4A. If the PCM turns the front heated oxygen sensor heater on and the front heated oxygen sensor heater circuit has a high voltage, the PCM determines that the heater circuit is faulty.
Rear HO2S Heater Circuit Low Input (P0037)
The PCM monitors the rear heated oxygen sensor heater control signal at PCM terminal 4D. If the PCM turns the rear heated oxygen sensor heater off and the rear heated oxygen sensor heater circuit has a low voltage, the PCM determines that the heater circuit is faulty.
Rear HO2S Heater Circuit High Input (P0038)
The PCM monitors the rear heated oxygen sensor heater control signal at PCM terminal 4D. If the PCM turns the rear heated oxygen sensor heater on and the rear heated oxygen sensor heater circuit has a high voltage, the PCM determines that the heater circuit is faulty.
Intake Manifold Pressure Sensor
The MAF sensor signal does not agree with the throttle position sensor signal (P0101)
The PCM compares the actual input signal from the intake manifold pressure sensor with the expected input signal from the intake manifold pressure sensor (calculated from the input voltage from the throttle position sensor or engine speed sensor).
If the intake air mass flow rate is below 5.0 g/s for 5 s and the throttle valve opening angle is more than 50% with the engine running, the PCM determines that the detected intake air mass flow rate is too low.
If the intake air mass flow value is higher than 96.5 g/s for 5 s and the engine speed is lower than 2000 min⁻¹, the PCM decides that the detected intake air mass flow value is too high.
Intake Manifold Air Pressure Sensor Circuit High Input (P0102)
The PCM monitors the input voltage from the intake manifold pressure sensor when the engine is running. If the input voltage at the PCM terminal 1P is below 0.21 V, the PCM determines that the intake manifold pressure circuit has a malfunction.
Intake Manifold Air Pressure Sensor Circuit High Input (P0103)
The PCM monitors the input voltage from the intake manifold pressure sensor when the engine is running. If the input voltage at PCM terminal 1P is greater than 4.9 V, the PCM determines that the intake manifold pressure circuit has a malfunction.
Intake Manifold Pressure Sensor
Intake Manifold Air Pressure Sensor Circuit Low Input (P0107)
The PCM monitors the input voltage of the intake manifold pressure sensor when the intake air temperature is above 10°C. If the input voltage at PCM terminal 1J is below 0.1 V, the PCM determines that the intake manifold pressure sensor circuit has a malfunction.
Intake Manifold Air Pressure Sensor Circuit High Input (P0108)
The PCM monitors the input voltage of the intake manifold pressure sensor when the intake air temperature is above 10°C. If the input voltage at PCM terminal 1J is above 4.9 V, the PCM determines that the intake manifold pressure sensor circuit has a malfunction.
Intake Air Temperature Sensor (intake air temperature)
Intake Air Temperature Circuit Malfunction (P0111)
If the intake air temperature is higher than the engine coolant temperature of 40°C with the ignition on, the PCM determines that there is a fault in the intake air temperature sensor circuit.
Intake Manifold Air Pressure Sensor Circuit Low Input (P0112)
The PCM monitors the input voltage of the intake air temperature sensor. If the input voltage at PCM terminal 2E is below 0.2 V, the PCM determines that the intake air temperature sensor circuit has a malfunction.
Intake Air Temperature Circuit High Input (P0113)
The PCM monitors the input voltage of the intake air temperature sensor. If the input voltage at PCM terminal 2E is greater than 4.8 V, the PCM determines that the intake air temperature sensor circuit has a malfunction.
Coolant Temperature Circuit Low Input (P0117)
The PCM monitors the coolant temperature sensor signal at PCM terminal 1M. If the coolant temperature sensor voltage is below 0.2 V, the PCM determines that the coolant temperature sensor circuit has a fault.
Coolant Temperature Circuit High Input (P0118)
The PCM monitors the coolant temperature sensor signal at PCM terminal 1M. If the coolant temperature sensor voltage is greater than 4.6 V, the PCM determines that the coolant temperature sensor circuit has a fault.
Closed Loop Fuel Control Timeout Exceeded (P0125)
The PCM monitors the signal from the coolant temperature sensor at PCM terminal 1M after the engine is started until the engine is warmed up. If the engine coolant temperature does not reach the expected temperature within the instruction time period, the PCM determines that the exit time (by engine coolant temperature) the closed loop fuel supply regulation limit has been exceeded.
Throttle Position Sensor
Throttle valve stuck closed (below expectations)/ open (higher than expected) position (P0121)
If the PCM detects that the throttle valve opening angle is less than 12.5% for 5 s after the following conditions occur, the PCM determines that the throttle valve is stuck in the closed position:
- engine coolant temperature is above 80°C;
- intake manifold pressure sensor signal - more than 32.0 g/s;
- if the PCM detects that the throttle valve opening angle is more than 50% for 5 s after the following conditions occur, the PCM determines that the throttle valve is stuck open:
- engine speed - above 500 min⁻¹;
- intake manifold pressure sensor signal - 0 g/s.
Throttle Position Circuit Low Input (P0122)
If the PCM detects the throttle position sensor voltage at PCM terminal 2A is less than 0.1 V after the ignition is turned on, the PCM determines that the throttle position circuit has a malfunction.
Throttle Position Circuit High Input (P0123)
If the PCM detects a throttle position sensor voltage at PCM terminal 2A greater than 4.9 V after the ignition is turned on, the PCM determines that the throttle position circuit has a malfunction.
Front Heated Oxygen Sensor No Response When Rich (P0131)
The PCM monitors the front heated oxygen sensor input voltage when the following conditions are met.
- engine speed - above 1500 min⁻¹;
- engine coolant temperature is above 80°C.
If the sensor input voltage is below 0.45 V for 41.2 s, the PCM determines that the front oxygen sensor is not switching.
Front Heated Oxygen Sensor No Response Lean (P0132)
The PCM monitors the front heated oxygen sensor input voltage when the following conditions are met.
- engine speed - above 1500 min⁻¹;
- engine coolant temperature is above 80°C.
If the sensor input voltage is higher than 0.45 V for 41.2 s, the PCM determines that the front oxygen sensor is not switching.
Front Heated Oxygen Sensor Circuit Malfunction (P0133)
The PCM monitors the inversion cycle period, rich-lean switching time, and rich-lean switching time. The PCM calculates the average inversion cycle period, rich-lean switching time, and rich-lean switching time when the following conditions are met:
- driving mode 3;
- design load 14.8–59.4% (at 2000 min⁻¹.);
- engine speed 1410–4000 min⁻¹ (model with manual transmission);
- engine speed 1190–4000 min⁻¹ (models with automatic transmission);
- vehicle speed - above 3.76 km/h;
- engine coolant temperature above 10°C;
- the signal inversion cycle of the front heated oxygen concentration sensor is more than 10 cycles.
If any of the calculated values exceeds the threshold, the PCM determines that the circuit has a malfunction.
No Signal from Front Heated Oxygen Sensor Circuit (P0134)
The PCM monitors the front heated oxygen sensor input voltage when the following conditions are met:
- engine speed - above 1500 min⁻¹.
- engine coolant temperature is above 80°C.
If the sensor input voltage never exceeds 0.55 V for 83.2 s, the PCM determines that the sensor circuit is not activating.
Rear Heated Oxygen Sensor Circuit High Input (P0138)
The PCM monitors the rear heated oxygen sensor input voltage. If the rear heated oxygen sensor input voltage is greater than 0.45 V for 6.4 seconds after the fuel supply is cut off, the PCM determines that the input signal level is too high.
No Signal from Rear Heated Oxygen Sensor Circuit (P0140)
The PCM monitors the rear heated oxygen sensor output voltage when the following conditions are met:
- engine speed - above 1500 min⁻¹.
- engine coolant temperature is above 80°C.
If the input voltage from the sensor does not exceed 0.55 V for 30.4 s, the PCM determines that the sensor circuit is not activating.
Fuel system
Excessive Lean Fuel Ratio (P0171)
The PCM unit monitors the values of short-term fuel supply adjustment (SHRTFT) and long-term fuel supply adjustment (LONGFT) for closed-loop fuel supply control. If the fuel supply adjustment exceeds the pre-programmed value, the PCM unit determines that the fuel mixture is too poor.
Fuel mixture too rich (P0172)
The PCM unit monitors the values of short-term fuel supply adjustment (SHRTFT) and long-term fuel supply adjustment (LONGFT) for closed-loop fuel supply control. If the fuel supply adjustment exceeds the pre-programmed value, the PCM unit determines that the fuel mixture is too rich.
Misfire Monitoring
Random Misfire Detected (P0300), Cylinder Misfire Detected (P0301, P0302, P0303, P0304)
The PCM monitors the timing of the crankshaft position sensor input signal. The PCM calculates the timing change for each cylinder. If the timing change exceeds pre-programmed values, the PCM detects a misfire in the corresponding cylinder. While the engine is running, the PCM counts the number of misfires that have occurred for every 200 and 1000 crankshaft revolutions and calculates a misfire ratio for each crankshaft revolution. If the ratio exceeds pre-programmed values, the PCM determines that a misfire has occurred, which may damage the catalytic converter or affect emission performance.
Knock sensor
Knock Sensor Circuit Low Input (P0327)
The PCM monitors the knock sensor input signal while the engine is running. If the input voltage between PCM terminals 2P and 2S is below 0.9 V, the PCM determines that the knock sensor circuit has a malfunction.
Knock Sensor Circuit High Input (P0328)
The PCM monitors the knock sensor input signal while the engine is running. If the input voltage between PCM terminals 2P and 2S is greater than 4.9 V, the PCM determines that there is a malfunction in the knock sensor circuit.
Crankshaft Position Sensor Circuit Malfunction (P0335)
If the PCM does not receive an input voltage from the crankshaft position sensor for 4.2 s while the mass air flow is 2.0 g/s or more, the PCM determines that the crankshaft position sensor circuit has a malfunction.
Camshaft Position Sensor Circuit Malfunction (P0340)
The PCM monitors the camshaft position sensor voltage while the engine is running. If the PCM does not receive input voltage from the camshaft position sensor, while the crankshaft position sensor input is present, it determines that the camshaft position circuit has a fault.
Exhaust gas recirculation valve
Exhaust Gas Recirculation Valve Circuit Malfunction (stepper motor) (P0403)
The PCM monitors the EGR valve input voltage. If the voltage at PCM terminals 4E, 4H, 4K and/or 4N remains low or high, the PCM determines that the EGR valve circuit has a malfunction.
Neutralization system
Efficiency of the neutralization system is below the threshold level (P0420)
The PCM compares the number of inversions of the front and rear heated oxygen sensors over a specified time. The PCM monitors the number of inversions of the rear sensor for a specified number of inversions of the front sensor when the following conditions are met. The PCM detects the ratio of inversions:
- engine speed - 1410–3000 min⁻¹ (models with manual transmission);
- engine speed - 1281–3000 min⁻¹ (models with automatic transmission);
- estimated load 15–50%*.
If the inversion ratio is below the threshold level, the PCM decides that the performance of the neutralization system has deteriorated.
* Maximum load rating varies with engine speed
Purge solenoid valve
Emission Control System Purge Control Valve Circuit Malfunction (P0443)
The PCM monitors the input voltages from the purge solenoid valve. If the voltage at the PCM terminal 4U remains low or high, the PCM determines that the purge solenoid valve circuit has a malfunction.
Cooling Fan Control System
Fan Control Circuit Malfunction (P0480)
The PCM monitors the fan control module input voltages. If the voltage at PCM pin 1U remains low or high, the PCM determines that the fan control circuit has a fault.
Neutral switch
Neutral Switch Input Malfunction (P0850)
The PCM monitors the input voltage changes of the neutral switch. If the PCM does not detect any voltage changes at the 1W terminal of the PCM when the vehicle is moving at a speed greater than 30 km/h and the clutch pedal is depressed multiple times (10 times), it determines that the neutral switch circuit has a malfunction.
Variable Intake Duty (VAD) Solenoid Valve
Variable Intake System Valve Circuit Malfunction (P1410)
The PCM monitors the VAD solenoid control signal at PCM terminal 4C. If the PCM detects that the control signal does not change when the solenoid is turned on and off, it assumes that the control circuit has a malfunction.
PCM Block
PCM +BB Low Voltage (P1562)
The PCM monitors the positive battery voltage at PCM terminal 2Z. If the PCM detects that the positive battery voltage is below 2.5 V for 2 s, it assumes that the backup voltage circuit has a malfunction.
Air mixing control system
Air Mixing Valve Stuck Closed (P2006)
The PCM monitors the mass air flow rate. If the actual air flow rate is lower than the expected value, the PCM assumes that the air mixing flap is stuck in the closed position under the following conditions:
- engine speed - above 3750 min⁻¹;
- engine coolant temperature is above 63°C;
- throttle opening angle is greater than the threshold value*.
* Maximum load rating varies with engine speed
Low input signal level of the air mixing system control solenoid valve circuit (P2009)
The PCM monitors the variable control signal from the air mixing solenoid valve at PCM terminal 4T. If the PCM turns the solenoid valve OFF but the voltage at terminal 4T remains low, it assumes that the air mixing solenoid valve circuit has a malfunction.
High input level of the air mixing system control solenoid valve circuit (P2010)
The PCM monitors the variable control signal of the air mixing solenoid valve at PCM terminal 4T. If the PCM turns the solenoid valve on but the voltage at terminal 4T remains high, the PCM assumes that the air mixing solenoid valve circuit has a malfunction.
Barometric pressure sensor
Barometric Pressure Sensor Circuit Low Input (P2228)
The PCM monitors the input voltage of the barometric pressure sensor. If the input voltage at the PCM terminal 1G is below 0.35 V, the PCM assumes that the barometric pressure sensor circuit has a malfunction.
Barometric Pressure Sensor Circuit High Input (P2229)
The PCM monitors the input voltage of the BARO sensor. If the input voltage at the PCM terminal 1G is greater than 4.92 V, the PCM assumes that the BARO sensor circuit has a malfunction.
Generator
Generator Input Circuit Open (P2502)
The PCM believes that the generator output voltage is greater than 17 V, and the voltage at the positive terminal of the battery is less than 11 V.
No Generator Output Voltage Signal (P2503)
The PCM requires more than 20 amps of current from the alternator and believes the alternator output voltage is below 8.5 volts while the engine is running.
Battery Overcharge (P2504)
The PCM detects that the generator output voltage is greater than 18.5 V, or the positive battery voltage is greater than 16 V when the engine is running.
CAN bus failure (U0073)
The CAN controller is damaged.
The PCM does not receive signals from the anti-lock brake system (U0121)
The PCM is not receiving signals from the anti-lock brake system control module.