Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO): Diagnosis Subaru Forester SG рестайлинг

OUTLINE OF DIAGNOSIS

Detect NG when having either Low NG or High NG.

A variable valve lift diagnosis oil pressure switch is installed for diagnosis. It is possible to determine whether the intake valve is in high mode (increase the amount of lift) or in low mode (suppressing the amount of lift) when the variable valve lift diagnosis oil pressure switch is turned ON or OFF.

1. Normal

OIL SWITCHING SOLENOID VALVE DUTY AND INTAKE VALVE REFERENCE

1. Low NG

When the variable valve lift diagnosis oil pressure switch remains OFF even though the intake valve tried to enter high mode (oil switching solenoid valve duty is large), this is judged as a Low NG.

1. High NG

When the variable valve lift diagnosis oil pressure switch remains ON even though the intake valve tried to enter low mode (oil switching solenoid valve duty is small), this is judged as a High NG.

DIAGNOSTIC METHOD

Abnormality Judgment

Judge as NG when the continuous time is longer than the predetermined time when the following conditions are established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

Low side: 0.784 seconds

High side: 3.0 seconds

Malfunction Indicator Light Illumination: illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the continuous time when the following conditions are established are more than 3 seconds.

Judgment Value

JUDGMENT VALUE

DTC CLEAR CONDITION

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect functional errors of the front oxygen (A/F) sensor heater.

Judge as NG when it is determined that the front oxygen (A/F) sensor impedance is large by referring to the engine condition such as fuel shut-off in deceleration, etc.

Identifying Front Oxygen Sensor Components. Scheme 7

Judge as NG when the continuous time of meeting the malfunction criteria below becomes more than the time needed for diagnosis (10 seconds). Judge as OK and clear NG when the continuous time of not completing the malfunction criteria below becomes more than the time needed for diagnosis (10 seconds).

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of heater.

The heater performs duty control, and the output terminal voltage at ON is 0 V and the output terminal voltage at OFF is the battery voltage.

Judge NG when the terminal voltage remains Low.

Identifying Front Oxygen Sensor Heater Output Voltage Graph. Scheme 8

Abnormality Judgment

Judge NG when the continuous time until completing the malfunction criteria below becomes more than 1 second (8 cycles).

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are completed.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of heater.

The heater performs duty control, and the output terminal voltage at ON is 0 V and the output terminal voltage at OFF is the battery voltage.

Judge NG when the terminal voltage remains High.

Identifying Front Oxygen Sensor Heater Output Voltage Graph. Scheme 9

Abnormality Judgment

Judge NG when the continuous time until completing the malfunction criteria below becomes more than 1 second (8 cycles).

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are completed.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect oxygen sensor heater open or short circuit.

The oxygen sensor heater performs duty control, and the output terminal voltage at ON is 0 V, and the output terminal voltage at OFF is the battery voltage.

Judge NG when the terminal voltage remains Low.

Identifying Oxygen Sensor Heater Output Voltage Graph. Scheme 10

Abnormality Judgment

Judge as NG when the continuous time while meeting all of the malfunction criteria below is more than 2560 milliseconds (10 cycles).

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.56 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are completed.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect oxygen sensor heater open or short circuit.

The oxygen sensor heater performs duty control, and the output terminal voltage at ON is 0 V, and the output terminal voltage at OFF is the battery voltage.

Judge NG when the terminal voltage remains High.

Identifying Oxygen Sensor Heater Output Voltage Graph. Scheme 11

Abnormality Judgment

Judge as NG when the continuous time while meeting all of the malfunction criteria below is more than 2560 milliseconds (10 cycles).

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.56 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are completed.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction of intake manifold pressure sensor output property. Judge NG when the intake air pressure AD value is Low whereas it seemed to be High from the viewpoint of engine condition, or when it is High whereas it seemed to be Low from the engine condition.

Identifying MAP/MAF Sensor Output Voltage Graph. Scheme 12

Abnormality Judgment

Judge NG when either Low side or High side becomes NG.

Judge as NG when the continuous time with the following criteria established exceeds the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 3 seconds for low side, 7 seconds for high side

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when both Low side and High side become OK.

Judge as OK when the malfunction criteria below are completed.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open circuit of the oil switching solenoid valve.

Judge as NG when the current is small even though the output duty is large.

Abnormality Judgment

Judge as NG when the continuous time when the following conditions are established is more than 2 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the continuous time when the following conditions are established are more than 2 seconds.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect short circuits of the oil switching solenoid valve.

Judge as a short NG when the current is large even though the output duty is small.

Abnormality Judgment

Judge as NG when the continuous time when the following conditions are established is more than 2 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the continuous time when the following conditions are established are more than 2 seconds.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction of air flow sensor output property.

Judge as a low side NG when the air flow voltage indicates a small value regardless of running in a state where the air flow voltage increases. Judge as a high side NG when the air flow voltage indicates a large value regardless of running in a state where the air flow voltage decreases. Judge air flow sensor property NG when the Low side or High side becomes NG.

Identifying Air Flow Sensor Output Voltage Graph. Scheme 13

Abnormality Judgment

Judge as NG when the continuous time with the following criteria established exceeds the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

Low side: 3 seconds

High side: 10 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK when the criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect open or short circuits of the air flow sensor.

Judge as NG if it is out of specification.

Identifying Air Flow Sensor Output Voltage Graph. Scheme 14

Judge as NG when the continuous time until completing the malfunction criteria below becomes 0.5 seconds or more. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect open or short circuits of the air flow sensor.

Judge as NG if it is out of specification.

Identifying Air Flow Sensor Output Voltage Graph. Scheme 15

Judge NG when the continuous time until completing the malfunction criteria below becomes more than 0.5 seconds. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of intake manifold pressure sensor.

Judge as NG if it is out of specification.

Identifying Intake Manifold Pressure Sensor Output Voltage Graph. Scheme 16

Judge as NG when the continuous time until completing the malfunction criteria below becomes 0.5 seconds or more. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of intake manifold pressure sensor.

Judge as NG if it is out of specification.

Identifying Intake Manifold Pressure Sensor Output Voltage Graph. Scheme 17

Judge as NG when the continuous time until completing the malfunction criteria below becomes 0.5 seconds or more. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction of intake air temperature sensor output property.

Judge as NG when the intake air temperature is not varied whereas it seemed to be varied from the viewpoint of engine condition.

Identifying Intake Air Temperature Sensor Output Voltage Graph. Scheme 18

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 1 second or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect open or short circuit of the intake air temperature sensor.

Judge as NG if it is out of specification.

Identifying Intake Air Temperature Sensor Output Voltage Graph. Scheme 19

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 0.5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect open or short circuit of the intake air temperature sensor.

Judge as NG if it is out of specification.

Identifying Intake Air Temperature Sensor Output Voltage Graph. Scheme 20

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 0.5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of the engine coolant temperature sensor.

Judge as NG if it is out of specification.

Identifying Engine Coolant Temperature Sensor Output Voltage Graph. Scheme 21

Judge as NG when the continuous time until completing the malfunction criteria below becomes 0.5 seconds or more. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of the engine coolant temperature sensor.

Judge as NG if it is out of specification.

Identifying Engine Coolant Temperature Sensor Output Voltage Graph. Scheme 22

Judge as NG when the continuous time until completing the malfunction criteria below becomes 0.5 seconds or more. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of throttle position sensor 1.

Judge as NG if it is out of specification.

Identifying Throttle Position Sensor Circuit Diagram. Scheme 23

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the open or short circuit of throttle position sensor 1.

Judge as NG if it is out of specification.

Identifying Throttle Position Sensor Circuit Diagram. Scheme 24

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the malfunction of engine coolant temperature output property.

Judge as NG when the engine coolant temperature does not rise in driving conditions where it should.

Identifying Engine Coolant Temperature Sensor Output Voltage Graph. Scheme 25

Abnormality Judgment

Judge as NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Timer for diagnosis after engine starting

1. Timer stop at fuel cut mode.
2. During the driving conditions except a) above, timer count up by 64 milliseconds + TWCNT milliseconds at every 64 milliseconds.

TWCNT is defined as follows

TWCNT = 0 at idle switch ON

TWCNT show on the following table at idle switch OFF.

TEMPERATURE SPECIFICATION

Judgment value of timer after engine starting

t = 574 - 33 x Ti (seconds)

Ti is the lowest engine coolant temperature after starting the engine.

Time Needed for Diagnosis: To be determined. (It is varied by the Min. engine coolant temperature and engine conditions such as vehicle speed and engine coolant temperature.)

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction of the engine coolant temperature sensor characteristics.

Memorize the engine coolant temperature and fuel temperature at the last engine stop, and use them to judge as NG when the engine coolant temperature does not decrease when it should.

Identifying Engine Coolant Temperature Sensor Output Voltage Graph. Scheme 26

Abnormality Judgment

Judge as NG if the continuous time with the following conditions established is more than 2.5 seconds.

Judgment Value

JUDGMENT VALUE

Normality Judgment

When the following conditions are established, judged as OK.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect malfunctions of the thermostat function.

Judge as NG when the engine coolant temperature is lower than the estimated engine coolant temperature and the difference between them is large. Judge as OK when the engine coolant temperature becomes to 70°C (158°F), and the difference is small, before judging NG.

Identifying Thermostat Valve Components. Scheme 27

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 30 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Not fixed

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of sensor.

Judge as NG when the element impressed voltage is out of range, or the element current is out of range.

Identifying O2 Sensor Electromotive Force Graph. Scheme 28

Judge as NG when the continuous time of completing any malfunction criteria below is more than 1 second.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of sensor.

Judge as NG when the element impressed voltage is out of range, or the element current is out of range.

Identifying O2 Sensor Electromotive Force Graph. Scheme 29

Judge as NG when the continuous time of completing any malfunction criteria below is more than 1 second.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the slow response of front oxygen (A/F) sensor.

Front oxygen (A/F) sensor cover has some ventilation holes for exhaust gas. Clogged ventilation holes are diagnosed.

When the holes are clogged, the A/F output variation becomes slow comparing with the actual A/F variation because oxygen which reaches the zirconia layer is insufficient. Therefore, if the sensor cover holes are clogged, the rich to lean judgment in the ECM is delayed when the change from rich to lean occurs.

Judge as NG when the actual movement in comparison to the ECM control amount is slow.

Identifying O2 Sensor. Scheme 30

Identifying O2 Sensor Electromotive Force Graph. Scheme 31

Calculate faf difference every 128 milliseconds, and the lambda value difference. Calculate the diagnostic value after calculating for 210 seconds.

Judge as NG when the malfunction criteria below are completed. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 210 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect open circuits of the sensor.

Judge as NG when the impedance of the element is large.

Identifying O2 Sensor Electromotive Force Graph. Scheme 32

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than 5 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the continuity NG of oxygen sensor. If the oxygen sensor voltage reading is not within the probable range considering the operating conditions, judge as NG.

Identifying O2 Sensor Comparative Voltage Graph. Scheme 33

Abnormality Judgment

Judge as NG if the continuous time during which the following conditions are established exceeds the predetermined time, and judge as OK if it doesn't.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

High side: 2.5 seconds

Low side 1: 20 seconds

Low side 2: 40 seconds

Low side 3: Value from Map

Map

FUEL CUT TIME AND DIAGNOSIS TIME REFERENCE

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the slow response of the oxygen sensor.

Judge as NG if either the rich to lean response diagnosis or lean to rich response diagnosis is NG, and judge as OK if both are OK.

[Rich --> lean response diagnosis]

1. Measure the response time for oxygen sensor output changes when the A/F ratio changes to rich to lean. If the measured response time is larger than the threshold value, it is NG. If it is smaller, it is OK.
2. Judge as NG when the oxygen sensor voltage is large (rich) when recovering from a deceleration fuel cut. [Lean --> rich response diagnosis] Measure the response time for oxygen sensor output changes when the A/F ratio changes to lean to rich. If the measured response time is larger than the threshold value, it is NG. Judge as NG when the oxygen sensor voltage remains small when recovering from a deceleration fuel cut. Diagnostic method Measure the response time of the output change of the oxygen sensor when the A/F ratio changes to rich to lean. And Judge as NG when the measured response time is larger than the threshold value.

Identifying O2 Sensor Comparative Voltage Graph. Scheme 34

When the oxygen sensor output voltage changes from 0.55 V (rich) to 0.25 V (lean), calculate the minimum response time for output change between 0.5 V and 0.3 V for the judgement criteria.

Identifying Oxygen Sensor Output Voltage Graph. Scheme 35

Abnormality Judgment

1. Judge as NG when the judgment value is larger than the threshold value after deceleration fuel cut. Response time (diagnosis value) > threshold value --> abnormal NOTE: Variation time of rear oxygen sensor output voltage is short during fuel shut-off in deceleration. Carry out the NG judgment only after the fuel shut-off in deceleration. Even without deceleration fuel cut, judge as OK if the value is below the threshold. When the deceleration fuel cut off time is more than 6 seconds, judge as NG if the following criteria are met 2 seconds after recovering from the deceleration fuel cut.
2. Judge as NG when the oxygen sensor voltage at recovery from a deceleration fuel cut, is large. If the fuel cut time in a deceleration fuel cut is long (more than 6 s), and even after recovering from a deceleration fuel cut, the oxygen sensor voltage is high (0.55 V or more), judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 time

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

1. Regardless of a deceleration fuel cut, if the response time (diagnosis value) when the oxygen sensor voltage has changed from rich to lean is shorter than the threshold value (judgment value), judge as a normal condition. Response time (diagnosis value) < threshold value --> normal
2. Do not judge as a normal condition.

Judge as OK when the criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Calculate the minimum value of 0.3 V to 0.5 V output change response time when the oxygen sensor output voltage changes from 0.25 V (lean) to 0.55 V (rich).

Identifying Oxygen Sensor Output Voltage Graph. Scheme 36

Abnormality Judgment

1. Judge as NG when the judgment value is larger than the threshold value after deceleration fuel cut. Response time (diagnosis value) > threshold value --> abnormal
2. If the oxygen sensor voltage is small after recovering from a deceleration fuel cut, and remains small, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 time

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

1. Regardless of a deceleration fuel cut, if the response time (diagnosis value) when the oxygen sensor voltage has changed from rich to lean is shorter than the threshold value (judgment value), judge as a normal condition. Response time (diagnosis value) < or = threshold value --> normal
2. Do not judge as a normal condition.

Judge as OK when the criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect abnormalities in the rear oxygen sensor output characteristics.

When looking at the intake air amount, water temperature, main feedback control, deceleration fuel cut and other operating conditions, even though the rear oxygen sensor voltage should be moving under those conditions, if the voltage is showing a low voltage, this is judged as a Low side NG. If the voltage is showing a high voltage, it is judged as a High side NG.

When either Low side or High side is NG, judged as rear oxygen sensor property NG.

Abnormality Judgment

When one of the following conditions is established, judged as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 200 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

When the following conditions are established, judged as OK.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect fuel system malfunction by the amount of main feedback control.

Diagnostic Method

Fuel system is diagnosed by comparing the target air fuel ratio calculated by ECM with the actual air fuel ratio measured by sensor.

Abnormality Judgment

Compare the diagnosed value (fsobd) with the threshold value, and if a condition where the malfunction criteria below are met continues for more than 50 seconds, judge that there is a fault in the fuel system.

Judgment Value

JUDGMENT VALUE

Map 4 Threshold value for fuel system malfunction criteria

MAP 4 THRESHOLD VALUE FOR FUEL SYSTEM MALFUNCTION CRITERIA

Time Needed for Diagnosis: 10 seconds x 5 times

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK when the malfunction criteria below continue for 10 seconds or more.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect fuel system malfunction by the amount of main feedback control.

Diagnostic Method

Fuel system is diagnosed by comparing the target air fuel ratio calculated by ECM with the actual air fuel ratio measured by sensor.

Abnormality Judgment

Compare the diagnosed value (fsobd) with the threshold value, and if a condition where the malfunction criteria below are met continues for more than 50 seconds, judge that there is a fault in the fuel system.

Judgment Value

JUDGMENT VALUE

Map 4 Threshold value for fuel system malfunction criteria

MAP 4 THRESHOLD VALUE FOR FUEL SYSTEM MALFUNCTION CRITERIA

Time Needed for Diagnosis: 10 seconds x 5 times

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK when the malfunction criteria below continues for 10 seconds.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect faults in the fuel temperature sensor output properties.

Diagnosis is performed in two methods; drift diagnosis and stack diagnosis. If either is NG, judge as NG. If both are OK, Judge as OK and clear the NG.

Drift Diagnosis

Normally fuel temperature is lower than engine coolant temperature. When the fuel temperature becomes higher than the engine coolant temperature, the range is considered to be shifted, and judged as NG.

Identifying Fuel Temperature Sensor Resistance Graph. Scheme 37

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 120 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 120 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK when the criteria below are met.

Judgment Value

JUDGMENT VALUE

Stuck Diagnosis

As the engine warms up (cumulative amount of intake air after starting is large), if the fuel temperature which should rise does not, determine as being stuck and NG.

Abnormality Judgment

Judge as NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Undecided

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK when the criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of fuel temperature sensor.

Judge as NG if it is out of specification.

Identifying Fuel Temperature Sensor Resistance Graph. Scheme 38

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 2.5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of fuel temperature sensor.

Judge as NG if it is out of specification.

Identifying Fuel Temperature Sensor Resistance Graph. Scheme 39

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 2.5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and dear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect for abnormal values in the oil temperature sensor output properties.

Judge as NG when the oil temperature does not rise even though the engine is running under a condition where it should rise.

Abnormality Judgment

When the following conditions are established, judged as NG.

Judgment Value

JUDGMENT VALUE

After engine start oil temperature sensor characteristic diagnosis timer (timer for diagnosis).

1. Timer stop at fuel cut mode.
2. During the driving conditions except a) above, timer count up by 64 milliseconds + TOILCNT milliseconds at every 64 milliseconds.

Where, TOILCNT is determined as follows

TOILCNT = 0 at idle switch ON

For TOILCNT at Idle switch off, refer to the following table.

TEMPERATURE SPECIFICATION

After engine start oil temperature characteristic diagnosis timer judgment value (t).

t = 1882940 - 43302 x Ti (t > or = 1882940)

Ti = The lowest coolant temperature after starting the engine.

Time Needed for Diagnosis: Undecided

Malfunction Indicator Light Illumination: illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

When the following conditions are established, judged as OK.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of the oil temperature sensor.

Judge as NG when outside of the possible range.

Judge as NG when the continuous time when the following conditions are established is more than 0.5 seconds. Judge as OK and clear the NG when the following conditions are not established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of the oil temperature sensor.

Judge as NG when outside of the judgment value.

Judge as NG when the continuous time when the following conditions are established is more than 0.5 seconds. Judge as OK and clear the NG when the following conditions are not established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of throttle position sensor 2.

Judge as NG if it is out of specification.

Identifying Throttle/Pedal Position Sensor Circuit Diagram. Scheme 40

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the open or short circuit of throttle position sensor 2.

Judge as NG if it is out of specification.

Identifying Throttle/Pedal Position Sensor Circuit Diagram. Scheme 41

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the presence of misfire occurrence. (Revolution fluctuation method)

Monitoring misfire which influences exhaust deterioration (1.5 times of FTP) and catalyst damage is made obligatory by the law. Misfire affecting these two has three patterns below.

1. Intermittent misfire (The same cylinder misfires in random, or different cylinders misfire in random.): FTP 1.5 times misfire
2. Every time misfire (The same cylinder misfires every time.): FTP 1.5 times misfire, Catalyst damage misfire The following detecting methods are adopted for these detection. Intermittent misfire: FTP 1.5 times misfire 180° Interval Difference Method (MT: 1,800 rpm or less; AT: None) 360° Interval Difference Method (whole range) 720° Interval Difference Method (3,000 rpm or more) Misfire every time: FTP 1.5 times misfire, Catalyst damage misfire 360° Interval Difference Method

When a misfire occurs, the engine RPM will decreased and the crankshaft position speed will change. Calculate the interval difference value (diagnostic value) from crankshaft position speed by the following formula, and judge whether a misfire is occurring or not comparing the calculated result with judgment value. Counting the number of misfires, if the misfire ratio is higher during 1000 rev. or 200 rev., Judge corresponding cylinders as NG.

DIAGNOSTIC METHOD

As shown in the following figure, pick a cylinder as the standard and name it omg 0. And the former crankshaft position speed is named omg 1, the second former crankshaft position speed is named omg 2, the third is named omg 3, etc.

Identifying Ignition Order. Scheme 42

180° Interval Difference Method

DIAGNOSTIC VALUE

Identifying Crankshaft Position Speed Graph - 180° Interval Difference Method. Scheme 43

360° Interval Difference Method

DIAGNOSTIC VALUE

Identifying Crankshaft Position Speed Graph - 360° Interval Difference Method. Scheme 44

720° Interval Difference Method

DIAGNOSTIC VALUE

Identifying Crankshaft Position Speed Graph - 720° Interval Difference Method. Scheme 45

FTP 1.5 times misfire (Misfire occurrence level which influences exhaust gas)

Judgment Value (Judge that malfunction occurs when the misfire ratio is high in 1000 engine revs.)

FTP EMISSION JUDGMENT VALUE

Time Needed for Diagnosis: 1000 engine revs.

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Catalyst damage misfire (Misfire occurrence level damaging catalyst)

Judgment Value (Judge that malfunction occurs when the misfire ratio is high in 200 engine rev. (400 ignitions)

CATALYST DAMAGE MISFIRE JUDGMENT VALUE

Map 1 Threshold value of malfunction criteria for misfire damaging catalyst

Map 1 Threshold Value Of Malfunction Criteria For Misfire Damaging Catalyst. Scheme 46

These figures indicate the misfire rate (%) in 400 ignitions; for example, 22.5 (%) means 400 (ignition) x 22.5 (%) = 90 (ignition) misfires. This value or more is judged as a misfire.

Time Needed for Diagnosis: 200 engine revs.

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of knock sensor.

Judge as NG if it is out of specification.

Identifying Knock Sensor Components. Scheme 47

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 1 second or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of knock sensor.

Judge as NG if it is out of specification.

Identifying Knock Sensor Components. Scheme 48

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 1 second or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of the crankshaft position sensor.

Judge as NG when the crank signal is not input even though the starter was rotated.

Identifying Camshaft And Crankshaft Signal. Scheme 49

Identifying Crankshaft Position Sensor And Crank Sprocket. Scheme 50

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than 3 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 3 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect for faults in crankshaft position sensor output properties.

Judge as NG when there is a problem in the number of crankshaft signals for every revolution.

Identifying Camshaft And Crankshaft Signal. Scheme 51

Identifying Crankshaft Position Sensor And Crank Sprocket. Scheme 52

Abnormality Judgment

Judge as NG when all the malfunction criteria below are completed more than 10 times in a row.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10 engine rotations

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of the camshaft position sensor.

Judge as NG when the number of camshaft signals remains abnormal.

Identifying Camshaft And Crankshaft Signal. Scheme 53

Abnormality Judgment

Judge as NG when the following malfunction criteria continues for 8 engine revolutions or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 8 rev.

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the following criteria are established.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction of camshaft position sensor output property.

Judge NG when the camshaft line signal input timing is shifted from the crankshaft signal because of timing belt tooth chip etc.

Identifying Camshaft And Crankshaft Signal. Scheme 54

Identifying Camshaft Position Sensor, Cam Sprocket And Air Gap. Scheme 55

Judge NG when the engine speed continues 4 revolutions for the malfunction criteria below. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4 revs.

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect EGR system malfunction.

Intake manifold pressure (negative pressure) is constant because the throttle valve is fully closed during deceleration fuel cut. At this time, when the EGR valve is opened/closed, the intake manifold pressure will change. EGR system OK/NG is judged by the range of this change.

Identifying Exhaust Gas Recirculation System Circuit Diagram. Scheme 56

Measure the pressure values when the enable conditions are established, and perform diagnosis by calculating those results.

1. Label the intake manifold pressure value as PMOF1, which is observed when enable conditions are established, and set the EGR target step to 50 steps (nearly full open).
2. Label the intake manifold pressure value as PMON, which is observed after one second has passed since EGR target step was set to 50 steps (when the enable conditions were established), and set the EGR target step to 0.
3. Label the intake manifold pressure value as PMOF2, which is observed after one second has passed since EGR target step was set to 0 (after two seconds have passed since the enable conditions were established).

Abnormality Judgment

Judge as NG when the following conditions are established, and judge as OK when not.

PMON - (PMOF1 + PMOF2) / 2< 2.48 kPa (18.63 mmHg, 0.733 inHg)

Time Needed for Diagnosis: Once

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Identifying Malfunction Indicator Light Illumination Graph. Scheme 57

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the deterioration of the catalyst function.

Though the front oxygen sensor output would change slowly with a new catalyst, the sensor output with a deteriorated catalyst becomes high and the inversion time is shortened.

For this reason, the catalyst diagnosis is carried out by monitoring the front oxygen sensor output and comparing it with the front oxygen (A/F) sensor output.

Identifying Rear Oxygen Sensor Output Waveform Graph. Scheme 58

After establishing the execution conditions, calculate the front oxygen (A/F) sensor lambda deviation cumulative value per 128 milliseconds (Sum | (sglmd n - sglmd n-1 ) |) and rear oxygen sensor output voltage deviation cumulative value (Sum | (ro2sad n - ro2sad n-1 ) |), and when the front oxygen (A/F) sensor lambda deviation cumulative value (Sum | (sglmd n - sglmd n-1 ) |) becomes higher than the predetermined value, calculate the diagnostic value. Judge as NG when the malfunction criteria below are met. Judge as OK if the criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 30 to 55 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Check if there is a leakage in fuel system or not, and perform the function diagnosis of valve.

Identifying Evaporative Emission Control System Diagram. Scheme 59

In this system diagnosis, check for leakage and valve function is conducted by changing the fuel tank pressure and monitoring the pressure change using the fuel tank pressure sensor. During 0.04-inch diagnosis, perform in the order of mode Z --> mode A --> mode B --> mode C and mode D; During 0.02-inch diagnosis, perform in the order of mode A --> mode B --> mode C --> mode D and mode E.

0.04-inch Diagnosis

Identifying 0.04-Inch Diagnosis Chart. Scheme 60

MODE DESCRIPTION CHART

Mode Table for Evaporative Emission Control System Diagnosis

MODE TABLE FOR EVAPORATIVE EMISSION CONTROL SYSTEM DIAGNOSIS

0.02-inch Diagnosis

Identifying 0.02-Inch Diagnosis Chart. Scheme 61

MODE DESCRIPTION CHART

Purge control solenoid valve open fault diagnosis

DTC

P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)

Purpose of Mode Z

When performing the leakage diagnosis of EVAP system, the purge control solenoid valve must operate normally. Therefore, mode Z is used to diagnose the purge control solenoid valve stuck open condition. Note that if a purge control solenoid valve stuck open fault is detected, the EVAP system leakage diagnosis is cancelled.

Diagnostic method

Purge control solenoid valve functional diagnosis is performed by monitoring the tank pressure in mode Z.

Normality Judgment

Judge OK and change to Mode A when the criteria below are completed in 3 seconds after Mode Z started.

Judgment Value

JUDGMENT VALUE

Normal

Identifying Fuel Tank Pressure Graph. Scheme 62

1. evptez - evptezha < or = 0.4 kPa (3.0 mmHg, 0.12 inHg)
2. evptezini - evptezha < or = 0.4 kPa (3.0 mmHg, 0.12 inHg)

Judge as normal when both are established.

Abnormality Judgment

If OK judgment cannot be made, extend Mode Z 16 seconds more, and judge as NG when all the criteria below are completed after 16 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 16 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

When judgment for purge control solenoid valve stuck open NG is made, end the evaporative diagnosis. Cancel the evaporative diagnosis when the OK/NG judgment for purge control solenoid valve stuck open cannot be made in Mode Z.

Purge Control Solenoid Valve Open Fixation

Identifying Purge Control Solenoid Valve Open Fixation Graph. Scheme 63

1. evptezini, evptez < or = 1.43 kPa (10.7 mmHg, 0.42 inHg)
2. evptez - evptezha < or = 0.87 kPa (6.5 mmHg, 0.26 inHg)
3. evptezini - evptezha < or = 0.87 kPa (6.5 mmHg, 0.26 inHg)
4. No fuel sloshing of over 2 0 (0.53 US gal, 0.44 Imp gal) for 40 seconds or more. Judge as normal when all are established.

Leak Diagnosis

DTC

P0442 Evaporative Emission Control System Leak Detected (Small Leak)

P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)

Diagnostic method

1. The diagnostic method consists of creating a sealed vacuum in the fuel tank and then determining the presence of leakage from the speed at which the tank internal pressure returns to atmospheric pressure.
2. The diagnosis is divided into the following five phases.

Mode A: (Estimated evaporation gas amount)

Calculate the tank pressure change amount (P1) when using mode A. After calculating P1, switch to mode B.

Mode B: (Negative pressure sealed)

Introduce negative pressure in the intake manifold to the tank.

Approximately 0 --> -1.4 kPa (0 --> -10.5 mmHg, 0 --> -0.41 inHg)

When the pressure above (desired negative pressure) is reached, enters Mode C.

In this case, if the tank pressure does not reach the target negative pressure, judge that there is a large leakage (10 seconds or 25 seconds) in the system and terminate the evaporative emission control system diagnosis.

Abnormality Judgment

Judge as NG (large leak) when the criteria below are met.

Judgment Value

JUDGMENT VALUE

Mode C: (Check pressure rise)

Stop the introduction of negative pressure. (Wait until the tank pressure returns to the start level of P2 calculation.)

Change to Mode D when the tank pressure returns to the start level of P2 calculation.

Judge immediate OK and change to Mode E when it does not return in spite of spending the specified time.

TANK PRESSURE SPECIFICATION

Mode D: (Measure amount of negative pressure change)

Monitor the tank pressure change amount in mode D. In this case, the tank pressure increases (nears atmospheric pressure), because evaporation occurs. However, if any leakage exists, the pressure increases additionally in proportion to this leakage. The pressure variation of this tank is P2.

After calculating P2, perform a small leak diagnosis according to the items below.

When Mode D is ended

Assign tank variations measured in Mode A and Mode D; P1 and P2, to the formula below, judge small leaks in the system. If the measured judgment value exceeds the threshold value, it is judged to be a malfunction.

Abnormality Judgment

Judge as NG when the criteria below are met and judge as OK and clear NG when not met.

Judgment Value

JUDGMENT VALUE

Map 7 Malfunction criteria limit for evaporation diagnosis

MAP 7 MALFUNCTION CRITERIA LIMIT FOR EVAPORATION DIAGNOSIS

Time Needed for Diagnosis: 30 to 100 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Leak Diagnosis

DTC

P0456 Evaporative Emission Control System Leak Detected (very small leak)

Diagnostic method

1. The diagnostic method consists of creating a sealed vacuum in the fuel tank and then determining the presence of leakage from the speed at which the tank internal pressure returns to atmospheric pressure.
2. The diagnosis is divided into the following five phases.

Mode A: (0 point compensation)

When the pressure in the tank is high, wait until it returns to 0 point (Near 0 mmHg,). Shift to mode B when returned to the 0 point. Cancel the diagnosis when 0 point does not return in the specified time.

Mode B: (Vacuum pressure introduction)

Introduce negative pressure in the intake manifold to the tank.

Approximately 0 --> -2.0 kPa (0 --> -15 mmHg, 0 --> -0.59 inHg)

When the pressure above (desired negative pressure) is reached, enters Mode C.

At this time, if the tank internal pressure does not reach the target vacuum pressure, cancel the diagnosis.

Mode C: (Vacuum pressure maintained)

Stop the introduction of negative pressure. (Wait until the tank pressure returns to the start level of P2 calculation.)

Change to Mode D either when the tank pressure returns to the start level of P2 calculation, or when the predetermined amount of time has passed.

Mode D: (Vacuum pressure change amount calculation)

Monitor the tank pressure in mode D, calculate (P2) the pressure change in the tank, and measure the time (evpdset) for the tank pressure to return when calculation of P2 is completed. Shift to Mode E when the tank pressure returns to the end level of P2 calculation. If it does not return to the P2 calculation end tank internal pressure after the predetermined amount of time has passed, make advanced OK judgement or cancel the diagnosis.

Normality Judgment

Judge as OK when the criteria below are met.

Judgment Value

JUDGMENT VALUE

Mode E: (Evaporation occurrence amount calculation)

Calculate the change of tank pressure with the time evpdset to judge as NG/OK according to the value of P1. (There are gray judgments.)

Abnormality Judgment

Judge as NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Map 7 Malfunction criteria limit for evaporation diagnosis

MAP 7 MALFUNCTION CRITERIA LIMIT FOR EVAPORATION DIAGNOSIS

Normality Judgment

Judge as OK when the criteria below are met.

Judgment Value

JUDGMENT VALUE

Map 8 Malfunction criteria limit for evaporation diagnosis

MAP 8 MALFUNCTION CRITERIA LIMIT FOR EVAPORATION DIAGNOSIS

Time Needed for Diagnosis: 65 to 514 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect open or short circuit of the drain valve.

Judge as NG when the ECM output level differs from the actual terminal level.

Identifying Evaporative Emission Control System Components. Scheme 64

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than 2.5 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect open or short circuit of the drain valve.

Judge as NG when the ECM output level differs from the actual terminal level.

Identifying Evaporative Emission Control System Components. Scheme 65

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than 2.5 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the tank pressure sensor output property abnormality.

If there is no variation of tank internal pressure when there should be under the operating condition, judge as NG.

Identifying Evaporative Emission Control System Pressure Sensor Output Voltage Graph. Scheme 66

Abnormality Judgment

Judge as NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

If the maximum value - minimum value for the fuel level every 60 seconds is less than 2 liters, extend 60 seconds and make judgment with the maximum and minimum values for the fuel level in 120 seconds. If a difference does not appear though the time was extended 60 seconds, extend the time (180,240,300 seconds) and continue the judgment. If the maximum value - minimum value for the fuel level is 2 liters or more, the diagnosis counter counts up.

Time Needed for Diagnosis: 1 minute x 16 times or more

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of the fuel tank pressure sensor.

Judge as NG if it is out of specification.

Identifying Evaporative Emission Control System Pressure Sensor Output Voltage Graph. Scheme 67

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 15 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 15 seconds

Malfunction Indicator Light: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK when the criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of the fuel tank pressure sensor.

Judge as NG if it is out of specification.

Identifying Evaporative Emission Control System Pressure Sensor Output Voltage Graph. Scheme 68

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 15 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 15 seconds

Malfunction Indicator Light: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK when the criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect open or short circuit of the purge control solenoid valve.

Judge as NG when the ECM output level differs from the actual terminal level.

Identifying Evaporative Emission System Purge Control Valve. Scheme 69

Abnormality Judgment

Judge as NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect open or short circuit of the purge control solenoid valve.

Judge as NG when the ECM output level differs from the actual terminal level.

Identifying Evaporative Emission System Purge Control Valve. Scheme 70

Abnormality Judgment

Judge as NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect malfunctions of the fuel level sensor output property.

If the fuel level does not vary in a particular driving condition / engine condition where it should, judge as NG.

Identifying Fuel Level Sensor Graph. Scheme 71

Abnormality Judgment

Judge as NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Undecided

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of fuel level sensor. Judge as NG if it is out of specification.

Identifying Fuel Level Sensor Circuit Diagram. Scheme 72

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than time needed for diagnosis (2.5 seconds).

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of fuel level sensor. Judge as NG if it is out of specification.

Identifying Fuel Level Sensor Circuit Diagram. Scheme 73

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below exceeds the time required for diagnosis (2.5 seconds).

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the unstable output faults from the fuel level sensor caused by noise. Judge as NG when the max. value and cumulative value of output voltage variation of the fuel level sensor is larger than the threshold value.

Calculate the Max. value (delflmax) and cumulative value (sumfl) of output voltage variation of fuel level sensor during 12.2 seconds. Judge it normal when both max. and cumulative values are not over the threshold value. Otherwise, when either of them is over the threshold value, the diagnosis counter counts up. Judge as NG if the counter indicated 4 counts.

Identifying Fuel Level Sensor Output Voltage Variation Graph. Scheme 74

Abnormality Judgment

Judge as NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

The diagnosis counter does not count up when the following conditions are completed within 12.2 seconds.

MINIMUM VALUE OF CHANGE OF TANK PRESSURE

Time Needed for Diagnosis: 12.2 seconds x 4 times

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the function abnormality of the radiator fan.

Judge as NG when the engine coolant temperature slowly decreases even when the radiator fan is rotating.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than 5 minutes.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 5 minutes

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of vehicle speed. Judge NG when low vehicle speed (0 km/h (0 MPH)) remains whereas it seemed to be in a usual driving speed.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes 4 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when all of the following criteria are established.

THRESHOLD VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of vehicle speed. Judge NG when high vehicle speed (240 km/h (149.1 MPH) or more) remains whereas it seemed to be in a usual driving speed.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes 4 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when all of the following criteria are established.

THRESHOLD VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction that actual engine rpm is not close to target engine rpm during idling. Judge as NG when actual engine RPM is not close to target engine RPM during idling.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criterion below is 10 seconds x 3 times.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10 seconds x 3 times

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear NG when the continuous time of completing the malfunction criterion below becomes more than the time needed for diagnosis (10 seconds).

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction that actual engine rpm is not close to target engine rpm during idling. Judge as NG when actual engine speed is not close to target engine RPM during idling.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criterion below is 10 seconds x 3 times.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10 seconds x 3 times

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear NG when the continuous time of completing the malfunction criterion below becomes more than the time needed for diagnosis (10 seconds).

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of starter SW.

Judge ON NG when the starter SW signal remains ON.

Abnormality Judgment

Judge as ON NG when the continuous time of completing the malfunction criteria below becomes more than 3 minutes.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 180 seconds

Malfunction Indicator Light Illumination: illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge ON OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect malfunctions in which the engine RPM continues to rise during idling.

Judge as NG when the continuous time of completing the all malfunction criteria below becomes more than the time needed for diagnosis (2 seconds).

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear NG when the continuous time of completing the malfunction criteria below becomes more than the time needed for diagnosis (5 seconds).

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect CAN communication failure.

When CAN communications is not possible, and CAN communications with AT is not possible, judge as NG if data from the AT is not normal.

Abnormality Judgment

When either of the following conditions is established, it is judged as NG.

Judge as OK and clear the NG when the continuous time when all of the following criteria are established is more than the predetermined time (1 s).

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 time

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction of microcomputer (RAM).

When there is a problem in the main CPU normal RAM, or the sub CPU normal RAM, judge as NG. Judge as OK when both are operating properly.

If it is possible to write data to the whole area of RAM in the initial routine, and is possible to read the same data, it is judged as OK, and if not, NG.

Abnormality Judgment

Judge as NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Undecided

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Judge as NG when SUM value of ROM is outside the standard value.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes 0.5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Undecided

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Judge as NG when either the following is completed.

1. When the read value of throttle position sensor 1 signal is mismatched between main CPU and sub CPU.
2. When the read value of accelerator position sensor 1 signal is mismatched between main CPU and sub CPU.
3. When the sub CPU operates abnormally.
4. When the communication between main CPU <----> sub CPU is abnormal.
5. When the input amplifier circuit of throttle position sensor 1 is abnormal.
6. When the cruise control cannot be canceled correctly.
7. When the signal of brake SW1 and 2 is mismatched.
8. When the directed angle from the main CPU is abnormal.

Identifying Control Module Circuit Diagram. Scheme 75

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

1. 250 milliseconds
2. 250 milliseconds
3. 200 milliseconds
4. 200 milliseconds
5. 24 milliseconds
6. 250 milliseconds
7. 200 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Judge as NG when the target opening angle and actual opening angle is mismatched or the current to motor is more than specified duty for specified time continuously.

Identifying Throttle Actuator Control Range/Performance Diagram. Scheme 76

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

1. Target opening angle and actual opening angle: 250 milliseconds (For NG) 2000 milliseconds (For OK)
2. Output duty to drive circuit: 2000 milliseconds

Details of Judgment Value

Identifying Electric Throttle Control Operating Graph. Scheme 77

Details of Judgment (The actual opening angle < target opening angle is always 1000 milliseconds)

Electric Throttle Control Operating Graph. Scheme 78

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the open or short circuit of radiator fan circuit.

Judge as NG when the ECM output level differs from the actual terminal level.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes 2.5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of radiator fan circuit.

Judge as NG when the ECM output level differs from the actual terminal level.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes 2.5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Judge as NG when there is CAN communication with the AT and there is a MIL lighting request.

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than predetermined amount of time (2.5 seconds).

Judge as OK and clear the NG when the following conditions are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Judge the open or short circuit of the neutral SW.

Judge NG when the ECM neutral terminal input differs from the reception data from TCM.

Judge as NG when the continuous time of completing the malfunction criteria below becomes 2.56 seconds or more. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.56 seconds

Malfunction Indicator Light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Judge the open or short circuit of the neutral SW.

Judge NG when there is no change in the neutral SW even if the driving shift was applied. (There is neutral SW ON/OFF inversion from the vehicle speed and engine speed.)

Judge NG when the malfunction criteria below are completed 3 time or more after the neutral SW change. Judge as OK and clear the NG if there is change in the neutral SW.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Monitoring 3 times

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Judge the open or short circuit of the neutral SW.

Judge NG when the ECM neutral terminal input differs from the reception data from TCM.

Judge as NG when the continuous time of completing the malfunction criteria below becomes 2.56 seconds. Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.56 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Judge the open or short circuit of the neutral SW.

Judge NG when there is no change in the neutral SW even if the driving shift was applied. (There is neutral SW ON/OFF inversion from the vehicle speed and engine speed.)

Judge NG when the malfunction criteria below are completed 3 time or more after the neutral SW change. Judge as OK and clear the NG if there is change in the neutral SW.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Monitoring 3 times

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect that lambda value remains Low.

Judge as NG when lambda value is abnormal in accordance with A, value of front oxygen (A/F) sensor and running conditions such as vehicle speed, amount of intake air, engine coolant temperature, sub feedback control, etc.

lambda value = Actual air fuel ratio/Theoretical air fuel ratio

lambda> 1: Lean

lambda < 1: Rich

Identifying O2 Sensor Electromotive Force Graph. Scheme 79

Judge as NG when the continuous time of meeting the malfunction criteria below becomes more than the time needed for diagnosis (10 seconds). Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect that lambda value remains High.

Judge as NG when lambda value is abnormal in accordance with lambda value of front oxygen (A/F) sensor and running conditions such as vehicle speed, amount of intake air, engine coolant temperature, sub feedback control, etc.

lambda value = Actual air fuel ratio/Theoretical air fuel ratio

lambda 1: Lean

lambda < 1: Rich

Identifying O2 Sensor Electromotive Force Graph. Scheme 80

Judge as NG when the continuous time of meeting the malfunction criteria below becomes more than the time needed for diagnosis (10 seconds). Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Judge as NG when the valve is opened more than the default opening angle, but does not move to the close direction with the motor power stopped.

Identifying Return Spring Failure. Scheme 81

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1880 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the open/short circuit of pressure control solenoid valve.

Judge as NG when ECM output level is different from actual terminal level.

Identifying Fuel Tank Pressure Control Solenoid Valve Components. Scheme 82

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than time needed for diagnosis (2.5 seconds). Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open/short circuit of pressure control solenoid valve.

Judge as NG when ECM output level is different from actual terminal level.

Identifying Fuel Tank Pressure Control Solenoid Valve Components. Scheme 83

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than time needed for diagnosis (2.5 seconds). Judge as OK and clear the NG when the malfunction criteria below are not met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the abnormal function (stuck closed) of the drain valve.

Judge as NG when fuel tank pressure is low.

Identifying Vent Control Solenoid Valve Components. Scheme 84

Abnormality Judgment

Judge as NG when the continuous time of completing all the malfunction criteria below becomes more than 3 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 3 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the all malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the blow-by hose release abnormality.

Judge as NG when the diagnosis terminal voltage is high.

Identifying Positive Crankcase Ventilation Function Problem Diagram. Scheme 85

Abnormality Judgment

Judge as NG when the continuous time with the following criteria established exceeds 2.5 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK when the following conditions are established after predetermined amount of time has passed.

Judge as OK and clear the NG when the following criteria are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

1. Detects open or short circuit of EGR.
2. Judge as NG when the ECM output level differs from the actual terminal level.

Identifying Engine Control Module Circuit Diagram. Scheme 86

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

1. Detects open or short circuit of EGR.
2. Judge as NG when the ECM output level differs from the actual terminal level.

Identifying EGR Solenoid Valve Signal #1 Circuit Malfunction Diagram. Scheme 87

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open or short circuit of starter SW.

Judge as OFF NG when the engine starts without starter ON experience.

Abnormality Judgment

Judge as OFF NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 second

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OFF OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open/short circuit of back-up power supply circuit.

Judge as NG when the backup voltage becomes smaller than the battery voltage.

Abnormality Judgment

Judge as NG when the continuous time with the following criteria established exceeds 2.5 seconds.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction of fuel system from the amount of sub feedback control.

Judge as NG when the sub feedback learning control is being performed and when the learning value goes to the lean side.

Identifying Comparative Voltage Graph. Scheme 88

Judge as NG when the continuous time of completing the malfunction criteria below becomes 5 seconds or more. Judge as OK when the continuous time of completing the malfunction criteria below becomes 5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 5 seconds x 1 time

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction of fuel system from the amount of sub feedback control.

Judge as NG when the sub feedback learning control is being performed and when the learning value goes to the rich side.

Identifying Comparative Voltage Graph. Scheme 89

Judge as NG when the continuous time of completing the malfunction criteria below becomes 5 seconds or more. Judge as OK when the continuous time of completing the malfunction criteria below becomes 5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 5 seconds x 1 time

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Judge as NG when the motor current becomes too large or drive circuit is heated.

Identifying Throttle Actuator Control Motor Circuit Diagram. Scheme 90

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

1. 500 milliseconds (For NG)
2. 2000 milliseconds (For OK)

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Judge as NG when the electronic throttle control power is not supplied even when ECM sets the electric control throttle relay to ON.

Identifying Throttle Actuator Control Motor Circuit Diagram. Scheme 91

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

1. 400 milliseconds (For NG)
2. 2000 milliseconds (For OK)

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Judge as NG when the electronic throttle control power is supplied even when ECM sets the electric throttle control relay to OFF.

Identifying Throttle Actuator Control Motor Circuit Diagram. Scheme 92

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

1. 600 milliseconds (For NG)
2. 400 milliseconds (For OK)

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Judge as NG when all close point learning cannot conducted or abnormal value is detected.

Identifying Throttle/Pedal Position Sensor Circuit Diagram. Scheme 93

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 8 to 80 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the open or short circuit of accelerator pedal position sensor 1.

Judge as NG if it is out of specification.

Identifying Throttle/Pedal Position Sensor Circuit Diagram. Scheme 94

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 100 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the open or short circuit of accelerator pedal position sensor 1.

Judge as NG if it is out of specification.

Identifying Throttle/Pedal Position Sensor Circuit Diagram. Scheme 95

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 100 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the open or short circuit of accelerator pedal position sensor 2.

Judge as NG if it is out of specification.

Identifying Throttle/Pedal Position Sensor Circuit Diagram. Scheme 96

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 100 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Detect the open or short circuit of accelerator pedal position sensor 2.

Judge as NG if it is out of specification.

Identifying Throttle/Pedal Position Sensor Circuit Diagram. Scheme 97

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 100 milliseconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Judge as NG when the signal level of throttle position sensor 1 is different from the throttle position sensor 2.

Identifying Throttle/Pedal Position Sensor Circuit Diagram. Scheme 98

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Details of Judgment Value

Identifying Sensor Output Difference Value Graph. Scheme 99

Time Needed for Diagnosis: 214 milliseconds (For NG), 24 milliseconds (For OK)

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Judge as NG when the signal level of throttle position sensor 1 is different from the throttle position sensor 2.

Identifying Throttle/Pedal Position Sensor Circuit Diagram. Scheme 100

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

Details of Judgment Value

Identifying Sensor Output Difference Value Graph. Scheme 101

Time Needed for Diagnosis

1. 116 milliseconds (For NG)
2. 1000 milliseconds (For OK)

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the malfunction of atmospheric pressure sensor output property.

Judge as NG when the atmospheric pressure sensor output is largely different from the intake manifold pressure at engine starting.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes 0.3 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.3 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment

Judge as OK and clear the NG when the continuous time with the following criteria established is more than 0.3 seconds.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open/short circuit of the atmospheric pressure sensor.

Judge as NG if it is out of specification.

Abnormality Judgment

Judge as NG when the continuous time of completing the malfunction criteria below becomes 0.5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed

Detect the open/short circuit of the atmospheric pressure sensor.

Judge as NG if it is out of specification.

Abnormality Judgment

Judge as NG when the continuous time until completing the malfunction criteria below becomes 0.5 seconds or more.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgment

Judge as OK and clear the NG when the malfunction criteria below are met.

Judgment Value

JUDGMENT VALUE

1. When the OK idling cycle is completed 40 times in a row
2. When "Clear Memory" is performed