DESCRIPTION
The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is comprised of a throttle actuator, which operates the throttle valve, and a throttle position sensor, which detects the opening amount of the throttle valve. The ECM controls the throttle actuator to adjust the throttle valve opening amount so that the idle speed is maintained at the target idle speed.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P2109 | Throttle / Pedal Position Sensor "A" Minimum Stop Performance | The ISC learned value is approximately 3 times larger than normal even though the actual intake air amount during idle is within the normal range (up to 1.5 times the normal amount) (5 trip detection logic). | Throttle body with motor assembly | Does not come on | DTC stored | DTC for Mexico Models - Applies |
HINT
- The ISC learned value is the calculated intake air amount corresponding to the throttle opening amount necessary to maintain the idling speed.
- This malfunction is only detected once per trip. After it has been detected once, the system will not monitor for the malfunction for the rest of the trip.
- The system uses the throttle body with motor assembly and mass air flow meter sub-assembly to detect this malfunction.
MONITOR DESCRIPTION
If there are deposits in the throttle valve, a decrease in the ISC flow rate may cause engine stall or unstable idling. Therefore, the necessary ISC flow rate for idling is maintained using the ISC learned value and feedback. The ECM stores this DTC if the ISC learned value approaches its limit. The ECM begins monitoring for the DTC detection conditions when the following preconditions are met
1) The mass air flow meter sub-assembly is normal.
2) Atmospheric pressure is 85 kPa(abs) [637.6 mmHg(abs)] or higher.
3) The vehicle has been driven at a speed of 30 km/h (18.7 mph) or more at least once.
4) The engine coolant temperature is 45°C (113°F) or less at engine start, the engine is warmed up and conditions for ISC learning are met, or the ignition switch has been turned to ON (including when the engine is running) for 1 hour or more, the engine is warmed up and conditions for ISC learning are met.
The throttle actuator is operated by the ECM, and opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body with motor assembly. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.
HINT
This Electronic Throttle Control System (ETCS) does not use a throttle cable.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P2111 | Throttle Actuator Control System - Stuck Open | The ECM signals the throttle actuator to close, but the actuator is stuck (1 trip detection logic). | Throttle actuator Throttle body with motor assembly Throttle valve Wire harness or connector ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2112 | Throttle Actuator Control System - Stuck Closed | The ECM signals the throttle actuator to open, but the actuator is stuck (1 trip detection logic). | Throttle actuator Throttle body with motor assembly Throttle valve Wire harness or connector ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
The ECM determines that there is a malfunction in the ETCS when the throttle valve remains at a fixed angle despite a high drive current from the ECM. The ECM then illuminates the MIL and stores a DTC.
The electronic throttle control system has a dedicated power supply circuit. The voltage (+BM) is monitored and when it is low (less than 4 V), the ECM determines that there is a malfunction in the electronic throttle control system and cuts off the current to the throttle actuator.
When the voltage becomes unstable, the electronic throttle control system itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the ignition switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.
HINT
The electronic throttle control system does not use a throttle cable.
Scheme 272
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P2118 | Throttle Actuator Control Motor Current Range / Performance | An open in the electronic throttle control system power source (+BM) circuit (1 trip detection logic). | Open in electronic throttle control system power source circuit Battery Battery terminals ETCS fuse ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
The ECM monitors the battery supply voltage applied to the throttle actuator.
When the power supply voltage (+BM) is less than 4 V for 0.8 seconds or more, the ECM interprets this as an open in the power supply circuit (+BM). The ECM then illuminates the MIL and stores this DTC.
The electronic throttle control system is composed of the throttle actuator, throttle position sensor, accelerator pedal position sensor, and ECM. The ECM operates the throttle actuator to regulate the throttle valve in response to driver inputs. The throttle position sensor detects the opening angle of the throttle valve, and provides the ECM with feedback so that the throttle valve can be appropriately controlled by the ECM.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P2119 | Throttle Actuator Control Throttle Body Range / Performance | The throttle valve opening angle continues to vary greatly from the target opening angle (1 trip detection logic). | Electronic throttle control system Wire harness or connector ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
The ECM determines the actual opening angle of the throttle valve from the throttle position sensor signal. The actual opening angle is compared to the target opening angle commanded by the ECM. If the difference between these two values is outside the standard range, the ECM interprets this as a malfunction in the electronic throttle control system. The ECM then illuminates the MIL and stores this DTC.
HINT
- This Electronic Throttle Control System (ETCS) does not use a throttle cable.
- These DTCs relate to the accelerator pedal position sensor.
The accelerator pedal position sensor is built into the accelerator pedal sensor assembly and has 2 sensor circuits: VPA (main) and VPA2 (sub). This sensor is a non-contact type sensor and uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds. The voltage, which is applied to terminals VPA and VPA2 of the ECM, varies between 0.5 V and 4.75 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal from VPA indicates the actual accelerator pedal opening angle (throttle valve opening angle) and is used for engine control. A signal from VPA2 conveys the status of the VPA circuit and is used to check the accelerator pedal position sensor itself.
The ECM monitors the actual accelerator pedal opening angle (throttle valve opening angle) through the signals from VPA and VPA2, and controls the throttle actuator according to these signals.
Scheme 273
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P2120 | Throttle / Pedal Position Sensor / Switch "D" Circuit | VPA fluctuates rapidly beyond the upper and lower malfunction thresholds for 0.5 seconds or more (1 trip detection logic). | Accelerator pedal sensor assembly ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2122 | Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input | VPA is 0.4 V or less for 0.5 seconds or more when the accelerator pedal is depressed (1 trip detection logic). | Accelerator pedal sensor assembly Open in VCPA circuit Open or ground short in VPA circuit ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2123 | Throttle / Pedal Position Sensor / Switch "D" Circuit High Input | VPA is 4.8 V or higher for 2.0 seconds or more (1 trip detection logic). | Accelerator pedal sensor assembly Open in EPA circuit ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2125 | Throttle / Pedal Position Sensor / Switch "E" Circuit | VPA2 fluctuates rapidly beyond the upper and lower malfunction thresholds for 0.5 seconds or more (1 trip detection logic). | Accelerator pedal sensor assembly ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2127 | Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input | VPA2 is 1.2 V or less for 0.5 seconds or more when the accelerator pedal is depressed (1 trip detection logic). | Accelerator pedal sensor assembly Open in VCP2 circuit Open or ground short in VPA2 circuit ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2128 | Throttle / Pedal Position Sensor / Switch "E" Circuit High Input | Both of the following are met continue for 2.0 seconds or more (1 trip detection logic): (a) VPA2 is 4.8 V or higher. (b) VPA is between 0.4 V and 3.45 V. | Accelerator pedal sensor assembly Open in EPA2 circuit ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2138 | Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation | Either of the following conditions continues for 2.0 seconds or more (1 trip detection logic): (a) The difference between VPA and VPA2 is 0.02 V or less. (b) VPA is 0.4 V or less, and VPA2 is 1.2 V or less. | Short between VPA and VPA2 circuits Accelerator pedal sensor assembly ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
HINT
When any of these DTCs are output, check the accelerator pedal position sensor voltage using the Techstream. Enter the following menus: Powertrain / Engine / Data List / Gas Throttle / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.
| Trouble Area | Accelerator Pedal Fully Released | Accelerator Pedal Fully Depressed | ||
|---|---|---|---|---|
| Accel Sensor Out No. 1 | Accel Sensor Out No. 2 | Accel Sensor Out No. 1 | Accel Sensor Out No. 2 | |
| Open in VCP circuit | 0 to 0.2 V | 0 to 0.2 V | 0 to 0.2 V | 0 to 0.2 V |
| Open or ground short in VPA circuit | 0 to 0.2 V | 1.2 to 2.0 V | 0 to 0.2 V | 3.4 to 4.75 V |
| Open or ground short in VPA2 circuit | 0.5 to 1.1 V | 0 to 0.2 V | 2.6 to 4.5 V | 0 to 0.2 V |
| Open in EPA circuit | 4.5 to 4.98 V | 4.5 to 4.98 V | 4.5 to 4.98 V | 4.5 to 4.98 V |
| Normal condition | 0.5 to 1.1 V | 1.2 to 2.0 V | 2.6 to 4.5 V | 3.4 to 4.75 V |
HINT
Accelerator pedal positions are expressed as voltages.
When either output voltage of VPA or VPA2 deviates from the standard range, or the difference between the output voltages of the 2 sensor circuits is more than the threshold, the ECM determines that there is a malfunction in the accelerator pedal position sensor. The ECM then illuminates the MIL and stores a DTC.
Example
When the output voltage of VPA is 0.4 V or less for 0.5 seconds or more when the accelerator pedal is fully depressed, DTC P2122 is stored.
Refer to DTC P2120.
Refer to DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P2121 | Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance | Either of the following conditions is met for 0.5 seconds (1 trip detection logic): Difference between VPA and VPA2 is less than 0.4 V, or higher than 1.2 V. (learned value of accelerator off position) Difference between VPA and VPA2 is greater than or equal to the specified value. | Accelerator pedal sensor assembly ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal position sensor has 2 sensor elements and 2 signal outputs: VPA and VPA2. VPA is used to detect the actual accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA. When the difference between the output voltages of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal position sensor is malfunctioning. The ECM then illuminates the MIL and stores this DTC.
HINT
Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
The air fuel ratio sensor generates voltage* that corresponds to the actual air fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio level, and regulates the fuel injection time. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air fuel ratio accurately.
The air fuel ratio sensor is a planar type and integrated with a heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), current flows to the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are a narrow type. The heat generated by the heater is conducted to the solid electrolyte through alumina, therefore sensor activation is accelerated.
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric level.
*: Value changes inside the ECM. Since the air fuel ratio sensor is a current output element, the current is converted into a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.
Scheme 274
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P2195 | Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1) | Either of the following conditions is met: Conditions (a) and (b) are met for 5 seconds or more (2 trip detection logic): (a) Air fuel ratio sensor voltage is higher than 3.8 V. (b) Heated oxygen sensor voltage is 0.21 V or higher. While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor current is 2.2 mA or higher for 3 seconds (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) Intake system Gas leak from exhaust system Fuel pressure Fuel injector assembly ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P2196 | Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1) | Either of the following conditions is met: Conditions (a) and (b) are met for 5 seconds or more (2 trip detection logic): (a) Air fuel ratio sensor voltage is less than 2.8 V. (b) Heated oxygen sensor voltage is less than 0.66 V. While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor current is less than 0.7 mA for 3 seconds (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) Intake system Gas leak from exhaust system Fuel pressure Fuel injector assembly ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P2197 | Oxygen (A/F) Sensor Signal Stuck Lean (Bank 2 Sensor 1) | Either of the following conditions is met: Conditions (a) and (b) are met for 5 seconds or more (2 trip detection logic): (a) Air fuel ratio sensor voltage is higher than 3.8 V. (b) Heated oxygen sensor voltage is 0.21 V or higher. While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor current is 2.2 mA or higher for 3 seconds (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) Intake system Gas leak from exhaust system Fuel pressure Fuel injector assembly ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P2198 | Oxygen (A/F) Sensor Signal Stuck Rich (Bank 2 Sensor 1) | Either of the following conditions is met: Conditions (a) and (b) are met for 5 seconds or more (2 trip detection logic): (a) Air fuel ratio sensor voltage is less than 2.8 V. (b) Heated oxygen sensor voltage is less than 0.66 V. While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor current is less than 0.7 mA for 3 seconds (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) Intake system Gas leak from exhaust system Fuel pressure Fuel injector assembly ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
HINT
- DTCs P2195 and P2196 indicate malfunctions related to the bank 1 air fuel ratio sensor circuit.
- DTCs P2197 and P2198 indicate malfunctions related to the bank 2 air fuel ratio sensor circuit.
- When any of these DTCs are stored, check the air fuel ratio sensor voltage output by entering the following menus on the Techstream: Powertrain / Engine / Data List / Gas AF Control / AFS Voltage B1S1 or AFS Voltage B2S1.
- Short-term fuel trim values can also be read using the Techstream.
- The ECM regulates the voltages at the A1A+, A2A+, A1A- and A2A- terminals of the ECM to a constant level. Therefore, the air fuel ratio sensor output voltage cannot be confirmed without using the Techstream.
- If an air fuel ratio sensor malfunction is detected, the ECM will store a DTC.
Sensor Voltage Detection Monitor
Under air fuel ratio feedback control, If the air fuel ratio sensor output voltage is less than 2.8 V (very rich condition) for 5 seconds despite the heated oxygen sensor output voltage being less than 0.66 V, the ECM stores DTC P2196 or P2198. Alternatively, if the air fuel ratio sensor output voltage is higher than 3.8 V (very lean condition) for 5 seconds despite the heated oxygen sensor output voltage being 0.21 V or higher, DTC P2195 or P2197 is stored.
Sensor Current Detection Monitor
A rich air fuel mixture causes a low air fuel ratio sensor current, and a lean air fuel mixture causes a high air fuel ratio sensor current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration with the throttle valve fully closed. The ECM monitors the air fuel ratio sensor current during fuel-cut and detects any abnormal current values.
If the air fuel ratio sensor output is 2.2 mA or higher for more than 3 seconds of cumulative time, the ECM interprets this as a malfunction in the air fuel ratio sensor and stores DTC P2195 or P2197 (stuck on high side). If the air fuel ratio sensor output is less than 0.7 mA for more than 3 seconds of cumulative time, the ECM stores DTC P2196 or P2198 (stuck on low side).
Scheme 275
Refer to DTC P0300.
Refer to DESCRIPTION
Refer to DTC P2195, P2197.
Refer to DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P219A | Bank 1 Air-Fuel Ratio Imbalance | The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic). | Fuel injector assembly Intake system Gas leaks from exhaust system Ignition system Compression pressure Air fuel ratio sensor (bank 1 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P219B | Bank 2 Air-Fuel Ratio Imbalance | The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic). | Fuel injector assembly Intake system Gas leaks from exhaust system Ignition system Compression pressure Air fuel ratio sensor (bank 2 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P219C | Cylinder 1 Air-Fuel Ratio Imbalance | The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic). | Fuel injector assembly Intake system Gas leaks from exhaust system Ignition system Compression pressure Air fuel ratio sensor (bank 1 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P219D | Cylinder 2 Air-Fuel Ratio Imbalance | The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic). | Fuel injector assembly Intake system Gas leaks from exhaust system Ignition system Compression pressure Air fuel ratio sensor (bank 2 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P219E | Cylinder 3 Air-Fuel Ratio Imbalance | The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic). | Fuel injector assembly Intake system Gas leaks from exhaust system Ignition system Compression pressure Air fuel ratio sensor (bank 1 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P219F | Cylinder 4 Air-Fuel Ratio Imbalance | The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic). | Fuel injector assembly Intake system Gas leaks from exhaust system Ignition system Compression pressure Air fuel ratio sensor (bank 2 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P21A0 | Cylinder 5 Air-Fuel Ratio Imbalance | The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic). | Fuel injector assembly Intake system Gas leaks from exhaust system Ignition system Compression pressure Air fuel ratio sensor (bank 1 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
| P21A1 | Cylinder 6 Air-Fuel Ratio Imbalance | The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic). | Fuel injector assembly Intake system Gas leaks from exhaust system Ignition system Compression pressure Air fuel ratio sensor (bank 2 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Does not apply |
Fuel System Air Fuel Ratio Cylinder Imbalance Monitor
The ECM uses the air fuel ratio sensor and crankshaft position sensor to monitor the difference in air fuel ratios between the cylinders caused by differences in injection volumes between the cylinders, leakage in the intake or exhaust system, etc.
When the air fuel ratios of the cylinders are lean or rich with respect to each other, the ECM determines that there is a malfunction, illuminates the MIL and stores a DTC.
Air Fuel Ratio Sensor Monitoring Method: P219A and/or P219B are stored primarily when a rich side imbalance is detected.
When the system detects a difference in air fuel ratios between the cylinders due to fluctuation in the air fuel ratio sensor output over 1 engine cycle (2 crankshaft revolutions), the ECM determines that there is a malfunction.
Crankshaft Position Sensor Monitoring Method: P219C, P219D, P219E, P219F, P21A0 and/or P21A1 are stored primarily when a lean side imbalance is detected.
The system monitors the engine speed variation and when the variation becomes large, the ECM determines that there is a difference in air fuel ratios between the cylinders, which it determines to be a malfunction.
Refer to DTC P2195.
Refer to DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P2237 | Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 1 Sensor 1) | An open in the circuit between terminals A1A+ and A1A- of the air fuel ratio sensor while the engine is running (2 trip detection logic). | Open in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2238 | Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 1 Sensor 1) | Case 1: Condition (a) or (b) is met for 5.0 seconds or more (2 trip detection logic):(a) Voltage at terminal A1A+ is 0.5 V or less(b) Voltage difference between terminals A1A+ and A1A- is 0.1 V or less Case 2: Air fuel ratio sensor admittance is less than 0.0054 1/ohms (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2239 | Oxygen Sensor Pumping Current Circuit High (for A/F sensor) (Bank 1 Sensor 1) | The A1A+ voltage is higher than 4.5 V (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2240 | Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 2 Sensor 1) | An open in the circuit between terminals A2A+ and A2A- of the air fuel ratio sensor while the engine is running (2 trip detection logic). | Open in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2241 | Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 2 Sensor 1) | Case 1: Condition (a) or (b) is met for 5.0 seconds or more (2 trip detection logic):(a) Voltage at terminal A2A+ is 0.5 V or less(b) Voltage difference between terminals A2A+ and A2A- is 0.1 V or less Case 2: Air fuel ratio sensor admittance is less than 0.0054 1/ohms (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2242 | Oxygen Sensor Pumping Current Circuit High (for A/F sensor) (Bank 2 Sensor 1) | The A2A+ voltage is higher than 4.5 V (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2252 | Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (Bank 1 Sensor 1) | The A1A- voltage is 0.5 V or less (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2253 | Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (Bank 1 Sensor 1) | The A1A- voltage is higher than 4.5 V (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2255 | Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (Bank 2 Sensor 1) | The A2A- voltage is 0.5 V or less (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
| P2256 | Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (Bank 2 Sensor 1) | The A2A- voltage is higher than 4.5 V (2 trip detection logic). | Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
These DTCs are output when there is an open or short in the air fuel ratio sensor circuit, or if the air fuel ratio sensor output drops. To detect these problems, the voltage of the air fuel ratio sensor is monitored when turning the ignition switch to ON, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the air fuel ratio sensor is between 0.5 V and 4.5 V, it is considered normal. If the voltage is out of the specified range, or the admittance is less than the standard value, the ECM determines that there is a malfunction in the air fuel ratio sensor. If the same malfunction is detected in the next driving cycle, the ECM will illuminate the MIL and store a DTC.
The description can be found in EVAP (Evaporative Emission) System.
Refer to DESCRIPTION
5 hours* after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.
HINT
*: If the engine coolant temperature is not less than 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not less than 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.
| Sequence | Operation | Description | Duration |
|---|---|---|---|
| ECM activation | Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch is turned off. | ||
| A | Atmospheric pressure measurement | Vent valve is turned off (vent) and EVAP system pressure is measured by ECM in order to register atmospheric pressure. If pressure in EVAP system is not between 70 kPa(abs) and 110 kPa(abs) [525 mmHg(abs) and 825 mmHg(abs)], ECM cancels EVAP system monitor. | 60 seconds |
| B | First reference pressure measurement | In order to determine reference pressure, leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if leak detection pump and vent valve operate normally. | 360 seconds |
| C | EVAP system pressure measurement | Vent valve is turned on (closed) to shut EVAP system. Negative pressure (vacuum) is created in EVAP system, and then EVAP system pressure is measured. Write down measured value as they will be used in leak check. If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor. | 15 minutes* |
| D | Purge VSV monitor | Purge VSV is opened and then EVAP system pressure is measured by ECM. Large increase indicates normal. | 10 seconds |
| E | Second reference pressure measurement | After second reference pressure measurement, leak check is performed by comparing first and second reference pressure measurements. If stabilized system pressure is higher than second reference pressure, ECM determines that there is a leak in EVAP system. | 60 seconds |
| Final check | Atmospheric pressure is measured and then monitoring result is recorded by ECM. |
*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
Scheme 276
| *1 | Purge VSV: Off (Closed) | *2 | Purge VSV: On (Open) |
|---|---|---|---|
| *3 | Vent Valve: Off (Vent) | *4 | Vent Valve: On (Closed) |
| *5 | Leak Detection Pump: Off | *6 | Leak Detection Pump: On |
| *7 | Reference Orifice (0.02 inch) | *8 | Canister Pressure Sensor |
| *9 | Canister | *10 | Fuel Tank |
| *11 | Canister Pump Module | *12 | Canister Filter |
| *a | Operation A: Atmospheric Pressure Measurement | *b | Operation B, E: Reference Pressure Measurement |
| *c | Operation C: EVAP System Pressure Measurement | *d | Operation D: Purge VSV Monitor |
| *e | Atmospheric Pressure | *f | Negative Pressure |
P2420: Vent valve stuck open (vent)
In operation C, the vent valve turns on (closed) and the EVAP system pressure is then measured by the ECM using the canister pressure sensor to conduct an EVAP leak check. If the pressure does not increase when the vent valve is open, the ECM interprets this as the vent valve being stuck open. In this case the ECM will illuminate the MIL and store this DTC.
Scheme 277
The soak timer operates after the ignition switch is turned off. When a certain amount of time has elapsed after turning the ignition switch off, the soak timer activates the ECM to perform malfunction checks which can only be performed after the engine is stopped. The soak timer is built into the ECM.
Scheme 278
If the soak timer activates the ECM even though only a short amount of time has elapsed since the ignition switch was turned off, or if the soak timer does not activate the ECM even though a considerable amount of time has elapsed since the ignition switch was turned off, the ECM determines that the soak timer is malfunctioning, illuminates the MIL and stores this DTC the next time the ignition switch is turned to ON.
The Transmission Control Module (TCM) and ECM perform 2-way communication with each other via the Controller Area Network (CAN). The TCM sends signals to the ECM concerning required engine speed, required engine torque, warning indicators in the combination meter assembly, DTCs and other data. The ECM sends signals to the TCM concerning engine speed, opening angle of the throttle valve, temperature of intake air, temperature of engine coolant, engine torque and other data. If the TCM cannot communicate with the ECM, the TCM will conclude that there is a malfunction in the CAN communication system, illuminate the MIL and store this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| U0101 | Lost Communication with TCM | All of the following conditions are met for 1.25 seconds (1 trip detection logic): Ignition switch ON Battery voltage 10.5 V or higher No communication between ECM and TCM | ECM to TCM circuit TCM ECM | Comes on | DTC stored | DTC for Mexico Models - Applies |
When the ignition switch is turned to ON, battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil of the semiconductor pwr integration ECU (EFI MAIN relay), closing the contacts of the EFI MAIN relay and supplying power to terminals +B and +B2 of the ECM.
Scheme 279
The ECM constantly generates 5 V power source voltage from the battery voltages supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power source voltage to the sensors through the VC output circuit.
Scheme 280
When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied with power through the VC circuit are inactivated because the power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.
HINT
Under normal conditions, the MIL is illuminated when the ignition switch is turned to ON. The MIL goes off when the engine is started.
Scheme 281
Scheme 282
The fuel pump circuit consists of the ECM, fuel pump and fuel pump control ECU assembly (which operates the fuel pump). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump control ECU assembly. Based on the signal sent from the ECM, the fuel pump ECU adjusts the fuel pump operation speed.
Scheme 283
The fuel injector assemblies are located on the intake port. They inject fuel into the cylinders based on the signals from the ECM.
Scheme 284
While the engine is being cranked, current flows from terminal ST1 of the ignition switch assembly*1 or terminal STAR of the certification ECU (smart key ECU assembly)*2 to the park/neutral position switch assembly and to terminal STA of the ECM (STA signal).
*1: w/o Smart Key System.
*2: w/ Smart Key System.
This circuit opens and closes the intake air control valve assembly (intake air surge tank assembly) in response to changes in the engine load in order to increase the intake efficiency using the Acoustic Control Induction System (ACIS).
When the engine speed is between 0 and 4450 RPM and the throttle valve opening angle is 60° or more, the ECM supplies current to the actuator (on status) to close the intake air control valve assembly. Under other conditions, the intake air control valve assembly is open.
Scheme 285
Scheme 286
When the vehicle is being driven, depressing the accelerator pedal sensor assembly and brake pedal will activate the brake override system to restrict driving torque. The conditions for activating the brake override system as well as the items that are controlled are explained below.
Scheme 287
Activation Conditions
- When the accelerator pedal and brake pedal are depressed. NOTE: The vehicle may not enter the brake override system control due to the relation of the accelerator pedal angle and the vehicle's speed.
Items Controlled
- When the vehicle speed is extremely low, the accelerator opening value used when controlling the engine is reduced more than normal. HINT: During control, the Accelerator Position value in the Data List will be lower than normal.
- When the vehicle speed is not extremely low, the accelerator opening value is forcibly lowered to a fixed value. HINT: During control, the Accelerator Position value in the Data List is forcibly reduced to a specified value regardless of the actual accelerator opening value (Accel Sens. No. 1 Volt %). During brake override system control, the operation indicator is displayed on the meter.
Deactivation Conditions
- When the brake pedal or the accelerator pedal returns to some degree.
The Malfunction Indicator Lamp (MIL) is used to indicate vehicle malfunctions detected by the ECM.
The MIL operation can be checked visually. When the ignition switch is turned to ON, the MIL should be illuminated and should then turn off after the engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the Techstream.
Scheme 288
When SNOW mode is selected, the operation of the throttle motor is moderated to control engine output. This helps to reduce skidding of the drive wheels, and assists with takeoff acceleration, driving straightness and turning stability.
