Diagnostic Trouble Code (DTC) Detecting Criteria (h4dotc) Subaru Impreza WRX GH

LIST

DIAGNOSTIC TROUBLE CODE

OUTLINE OF DIAGNOSIS

Detect the AVCS system malfunction.

Judge NG when the amount of AVCS actual timing advance does not approach to the amount of AVCS target timing advance.

Scheme 219

ENABLE CONDITIONS

ENABLE CONDITIONS

GENERAL DRIVING CYCLE

Perform the diagnosis continuously after warming up when the engine speed increases and AVCS operates.

DIAGNOSTIC METHOD

1. When the conditions during which the differences of AVCS target timing advance amount and AVCS actual timing advance amount is large continues for certain amount of time.
2. When the differences of target timing advance amount and actual timing advance amount is calculated during AVCS control, and the difference per predetermined time is the specified value or larger.

1. Abnormality Judgment

Judge as NG when the following conditions are established within the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

1. AT model: 30000 ms
2. MT model: 20000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the following conditions are established within the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

1. AT model: 30000 ms
2. MT model: 20000 ms

DTC CLEAR CONDITION

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

MALFUNCTION INDICATOR LIGHT CLEAR CONDITIONS

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

FAIL SAFE

1. Ignition timing whole learning compensation: Enter the initial value (whole learning compensation factor = 0.5, Variable amount of whole learning compensation factor = 0.25) to the whole learning compensation factor and variable amount of whole learning compensation factor when IG OFF, and then make the whole learning incomplete. Enter the initial value (whole learning compensation factor = 0.5, Variable amount of whole learning compensation factor = 0.25) to the whole learning compensation factor and variable amount of whole learning compensation factor when making a normality judgment from abnormality judgment, and then make the whole learning incomplete.
2. Ignition timing partial learning compensation: Enter the initial value (0°CA) to the compensation value of partial learning zone with IG OFF. Enter the initial value (0°CA) to the compensation value of the partial learning zone when making a normality judgment --> abnormality judgment.
3. AVCS control: Maximum timing retard learning is not complete or maximum timing retard learning completion is not experienced.
4. ISC feedback compensation: Do not perform the AVCS actual timing advance compensation. Determine the OCV Driving Duty is the given value (9.36%).

ECM OPERATION AT DTC SETTING

Memorize the freeze frame data. (For test mode $02)

Detect the AVCS system malfunction.

Judge as NG when the timing advance is outside the normal range.

Scheme 220

ENABLE CONDITIONS

Perform the diagnosis continuously after starting engine and while AVCS is not operating.

Judge as NG when the camshaft sensor input position is not within the normal range.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 20000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1000 ms

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Ignition timing whole learning compensation: Enter the initial value (whole learning compensation factor = 0.5, Variable amount of whole learning compensation factor = 0.25) to the whole learning compensation factor and variable amount of whole learning compensation factor when IG OFF, and then make the whole learning incomplete. Enter the initial value (whole learning compensation factor = 0.5, Variable amount of whole learning compensation factor = 0.25) to the whole learning compensation factor and variable amount of whole learning compensation factor when making a normality judgment from abnormality judgment, and then make the whole learning incomplete.
2. Ignition timing partial learning compensation: Enter the initial value (0°CA) to the compensation value of partial learning zone with IG OFF. Enter the initial value (0°CA) to the compensation value of the partial learning zone when making a normality judgment --> abnormality judgment.
3. AVCS control: Maximum timing retard learning is not complete or maximum timing retard learning completion is not experienced.
4. ISC feedback compensation: Do not perform the AVCS actual timing advance compensation. Determine the OCV Driving Duty is the given value (9.36%).

Memorize the freeze frame data. (For test mode $02)

Note. For the detection standard, refer to DTC P0016. DTC P0016 CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELATION (BANK 1), Diagnostic Trouble Code (DTC) Detecting Criteria. >

Note. For the detection standard, refer to DTC P0011. DTC P0011 INTAKE CAMSHAFT POSITION - TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 1), Diagnostic Trouble Code (DTC) Detecting Criteria. >

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 when looking at engine status such as deceleration fuel cut.

Scheme 221

ENABLE CONDITIONS

Perform the diagnosis continuously after 42000 ms seconds or more have passed since the engine started.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10000 ms

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Front oxygen (A/F) sensor main learning compensation: Not allowed to calculate.
2. Correction when re-starting at high temperature: Normally minimum value 0.06 --> 0.
3. Purge control: Not allowed to purge.

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Detect front oxygen (A/F) sensor heater open or short circuit.

The front oxygen (A/F) 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 as NG when the terminal voltage remains Low.

Scheme 222

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4 ms x 250 time

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Front oxygen (A/F) sensor activation judgment: Front oxygen (A/F) sensor full activation is not complete, or front oxygen (A/F) sensor half activation is not complete.
2. A/F main learning: Not allowed to calculate the A/F main learning compensation factor.
3. Compensation when starting the engine at high temperature: Make the MIN value to be 0.3 --> 0, normally.
4. Purge control: Not allowed to purge.

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Detect front oxygen (A/F) sensor heater open or short circuit.

The front oxygen (A/F) 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 as NG when the terminal voltage remains High.

Scheme 223

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4 ms x 500 time

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Front oxygen (A/F) sensor activation judgment: Front oxygen (A/F) sensor full activation is not complete, or front oxygen (A/F) sensor half activation is not complete.
2. A/F main learning: Not allowed to calculate the A/F main learning compensation factor.
3. Compensation when starting the engine at high temperature: Make the MIN value to be 0.3 --> 0, normally.
4. Purge control: Not allowed to purge.

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Detect the rear oxygen sensor heater open or short circuit.

The rear 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 as NG when the terminal voltage remains Low.

Scheme 224

ENABLE CONDITIONS

After starting the engine, perform the diagnosis continuously when engine is low speed.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 8 ms x 320 time

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Sub feedback control: Not allowed

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Detect the rear oxygen sensor heater open or short circuit.

The rear 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 as NG when the terminal voltage remains High.

Scheme 225

ENABLE CONDITIONS

After starting the engine, perform the diagnosis continuously when engine is low speed.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 8 ms x 320 time

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Sub feedback control: Not allowed

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Detect problems in the intake manifold pressure sensor output properties.

Judge as 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.

Scheme 226

ENABLE CONDITIONS

Perform the diagnosis continuously after idling.

1. Abnormality Judgment

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

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

Low side: 3000 ms

High side: 3000 ms

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

1. Normality Judgment

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

If the duration of time while the following conditions are met is longer than the time indicated, judge as OK.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

Low side: Less than 1 second

High side: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Intake manifold pressure sensor process: Estimate the pressure from engine load.
2. ISC feedback: Not allowed to calculate the amount of feedback.
3. Heavy fuel judgment: Not allowed to carry out the heavy judgment.
4. Fuel cut control: Not allowed to cut the over pressure charged fuel.

Memorize the freeze frame data. (For test mode $02)

Detect the malfunction of air flow sensor output properties.

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.

Scheme 227

ENABLE CONDITIONS

Perform the diagnosis continuously after idling.

1. Abnormality Judgment

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

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

Low: 3000 ms

High: 10000 ms

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

1. Normality Judgment

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

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

Low: Less than 1 second

High: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

Detect open or short circuits of the air flow sensor.

Judge as NG if out of specification.

Scheme 228

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Air flow meter: Engine load is normally calculated by manifold pressure and engine speed; however, calculated only by manifold pressure.
2. EVAP cone, learning (fuel): Not allowed to learn.
3. Knock compensation: Knock compensation final advance/delay angle value = knock compensation value + whole learning compensation value + portional learning compensation value When normal: Knock compensation value = Fixed at 0°CA Failure: Knock compensation value * Fixed at 0°CA (When knock: Max. 12°CA retard) Whole learning compensation coefficient update not allowed Portional learning zone compensation value calculation not allowed
4. ISC control: Open loop compensation is set to (1 g (0.04 oz)/s). Stop calculation of throttle sensor temperature compensation (hold previous value)
5. Purge control: Not allowed to purge.

Memorize the freeze frame data. (For test mode $02)

Detect open or short circuits of the air flow sensor.

Judge as NG if out of specification.

Scheme 229

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Air flow meter: Engine load is normally calculated by manifold pressure and engine speed; however, calculated only by manifold pressure.
2. EVAP cone, learning (fuel): Not allowed to learn.
3. Knock compensation: Knock compensation final advance/delay angle value = knock compensation value + whole learning compensation value + portional learning compensation value When normal: Knock compensation value = Fixed at 0°CA Failure: Knock compensation value * Fixed at 0°CA (When knock: Max. 12°CA retard) Whole learning compensation coefficient update not allowed Portional learning zone compensation value calculation not allowed
4. ISC control: Open loop compensation is set to (1 g (0.04 oz)/s). Stop calculation of throttle sensor temperature compensation (hold previous value)
5. Purge control: Not allowed to purge.

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 230

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Intake manifold pressure sensor process: Estimate the pressure from engine load.
2. ISC feedback: Not allowed to calculate the amount of feedback.
3. Heavy fuel judgment: Not allowed to carry out the heavy judgment.
4. Fuel cut control: Not allowed to cut the over pressure charged fuel.

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 231

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Intake manifold pressure sensor process: Estimate the pressure from engine load.
2. ISC feedback: Not allowed to calculate the amount of feedback.
3. Heavy fuel judgment: Not allowed to carry out the heavy judgment.
4. Fuel cut control: Not allowed to cut the over pressure charged fuel.

Memorize the freeze frame data. (For test mode $02)

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.

Scheme 232

ENABLE CONDITIONS

Perform the diagnosis when the vehicle speed condition is met after warming up from a cold condition.

1. Abnormality Judgment

Judge as NG when the following conditions are established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. Normality Judgment

Judge as OK and clear the NG if the following conditions are established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Intake air temperature sensor process: Intake air temperature is fixed at 20°C (68°F).

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 233

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Intake air temperature sensor process: Intake air temperature is fixed at 20°C (68°F).

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 234

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Intake air temperature sensor process: Intake air temperature is fixed at 20°C (68°F).

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 235

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Engine coolant temperature sensor process: Engine coolant temperature is fixed at 70°C (158°F)
2. ISC Feedback: Calculate target engine speed as engine coolant temperature 70°C (158°F).
3. ISC learning: Not allowed to learn.
4. Heavy fuel judgment control: Not allowed to carry out the heavy judgment.
5. Air conditioner control: Not allowed to turn the air conditioner to ON.
6. Radiator fan control: Both main and sub fan are in High driving.
7. High water temperature expansion compensation coefficient: Normally, mass expands with high water temperature and other conditions, but this ignores water temperature conditions and expands when other conditions are established.
8. AVCS Control: Oil flow control solenoid valve drive output duty = 0 %.
9. Tumble generator valve control: Open the tumble generator valve.

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 236

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Engine coolant temperature sensor process: Engine coolant temperature is fixed at 70°C (158°F)
2. ISC Feedback: Calculate target engine speed as engine coolant temperature 70°C (158°F).
3. ISC learning: Not allowed to learn.
4. Heavy fuel judgment control: Not allowed to carry out the heavy judgment.
5. Air conditioner control: Not allowed to turn the air conditioner to ON.
6. Radiator fan control: Both main and sub fan are in High driving.
7. High water temperature expansion compensation coefficient: Normally, mass expands with high water temperature and other conditions, but this ignores water temperature conditions and expands when other conditions are established.
8. AVCS Control: Oil flow control solenoid valve drive output duty = 0 %.
9. Tumble generator valve control: Open the tumble generator valve.

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 237

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 ms

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Stop the continuity to the electronic throttle control motor. (Throttle opening is fixed to 6°.)

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 238

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 ms

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Stop the continuity to the electronic throttle control motor. (Throttle opening is fixed to 6°.)

Memorize the freeze frame data. (For test mode $02)

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.

Scheme 239

ENABLE CONDITIONS

Map

ENGINE SPEED REFERENCE

ENGINE SPEED REFERENCE

Perform the diagnosis only once after engine start.

1. Abnormality Judgment

Judge as NG if the criteria below are met.

Judgment Value

JUDGMENT VALUE

Timer for diagnosis after engine start

1. Timer stop at fuel cut
2. During the driving conditions except a) above, timer counts up as follows.

64 milliseconds + TWCNT milliseconds (the time of at 64 milliseconds)

TWCNT is defined as follows

TWCNT = 0 at idle switch ON

TWCNT show on the following table at idle switch OFF.

VEHICLE SPEED REFERENCE

Judgment value of timer after engine starting

t = 451056 ms - 25870 ms x Ti

Ti: The lowest coolant temperature after engine start

Time Needed for Diagnosis: Less than 1 second

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

1. Normality Judgment

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

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Engine coolant temperature sensor process: Engine coolant temperature is fixed at 70°C (158°F)
2. ISC Feedback: Calculate target engine speed as engine coolant temperature 70°C (158°F).
3. ISC learning: Not allowed to learn.
4. Heavy fuel judgment control: Not allowed to carry out the heavy judgment.
5. Air conditioner control: Not allowed to turn the air conditioner to ON.
6. Radiator fan control: Both main and sub fan are in High driving.
7. High water temperature expansion compensation coefficient: Normally, mass expands with high water temperature and other conditions, but this ignores water temperature conditions and expands when other conditions are established.
8. AVCS Control: Oil flow control solenoid valve drive output duty = 0 %.
9. Tumble generator valve control: Open the tumble generator valve.

Memorize the freeze frame data. (For test mode $02)

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.

Scheme 240

ENABLE CONDITION

ENABLE CONDITION

Perform the diagnosis only once after starting the engine.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

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 75°C (167°F), and the difference is small, before judging NG.

Scheme 241

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 64 ms x 3 time x 152 time

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

Detect the open or short circuit of sensor.

Judge as NG, when the element voltage is out of the specified range.

Scheme 242

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

Input voltage (+): 1000 ms

Input voltage (-): 1000 ms

Input voltage (+) - Input voltage (-)|: 1000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Front oxygen (A/F) sensor activation judgment: Front oxygen (A/F) sensor full activation is not complete, or front oxygen (A/F) sensor half activation is not complete.
2. A/F main learning: Not allowed to calculate the A/F main learning compensation factor.
3. Compensation when starting the engine at high temperature: Make the MIN value to be 0.3 --> 0, normally.
4. Purge control: Not allowed to purge.

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Detect the open or short circuit of sensor.

Judge as NG, when the element voltage is out of the specified range.

Scheme 243

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

Input voltage (+): 1000 ms

Input voltage (-): 1000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Front oxygen (A/F) sensor activation judgment: Front oxygen (A/F) sensor full activation is not complete, or front oxygen (A/F) sensor half activation is not complete.
2. A/F main learning: Not allowed to calculate the A/F main learning compensation factor.
3. Compensation when starting the engine at high temperature: Make the MIN value to be 0.3 --> 0, normally.
4. Purge control: Not allowed to purge.

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

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 actual change from rich to lean occurs. Judge as NG when the actual movement in comparison to the ECM control amount is slow.

Scheme 244

Scheme 245

ENABLE CONDITIONS

Perform diagnosis only once at a constant speed of 10 km/h - 120 km/h (6.2 MPH - 74.6 MPH) 120000 ms or more after starting the engine.

Calculate faf difference every 32ms x 4, and the lambda, value difference. Calculate the diagnosis value after calculating 820 time.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 32 ms x 4 x 820 time

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 32 ms x 4 x 820 time

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Front oxygen (A/F) sensor main learning compensation: Not allowed to calculate.
2. Correction when re-starting at high temperature: Normally minimum value 0.3 --> 0.
3. Purge control: Not allowed to purge.

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Detect open circuits of the sensor.

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

Scheme 246

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 5000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Front oxygen (A/F) sensor activation judgment: Front oxygen (A/F) sensor full activation is not complete, or front oxygen (A/F) sensor half activation is not complete.
2. A/F main learning: Not allowed to calculate the A/F main learning compensation factor.
3. Compensation when starting the engine at high temperature: Make the MIN value to be 0.3 --> 0, normally.
4. Purge control: Not allowed to purge.

Memorize the freeze frame data. (For test mode $02)

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

Scheme 247

Used for abnormality judgment

ENABLE CONDITION

Used for normality judgment

ENABLE CONDITION

After starting the engine, continuously perform the diagnosis with the same engine condition.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

High: 2500 ms

Low (1): 20000 ms

Low (2): 150000 ms

Low (3): Value from Map

Map

JUDGMENT VALUE

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis

High: Less than 1 second

Low (1): Less than 1 second

Low (2): Less than 1 second

Low (3): Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Sub feedback control: Not allowed

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Note. For the detection standard, refer to DTC P0137. DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Criteria. >

Detect the slow response of the oxygen sensor.

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

[Rich --> lean diagnosis response]

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 diagnosis response]

1. 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.
2. Judge as NG when the oxygen sensor voltage remains small when recovering from a deceleration fuel cut.

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.

Scheme 248

Rich --> lean diagnosis response

ENABLE CONDITIONS

Perform the diagnosis only once when deceleration fuel cut occurs after rapid acceleration. (Pay attention to the oxygen sensor voltage for the timing of the deceleration.)

When the oxygen sensor output voltage changes from 0.55 V (rich) to 0.15 V (lean), calculate the minimum response time for output change between 0.5 V and 0.2 V for the judgment criteria.

Scheme 249

1. 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 cut in deceleration. NG judgment should be performed after deceleration fuel cut. Even without deceleration fuel cut, judge as OK if the value is below the threshold. When the deceleration fuel cut time is 5000 ms or more, judge as NG if the following criteria are met 2000 ms 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 (5000 ms or more), 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.

1. 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 and clear the NG if the following conditions are established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 time

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Sub feedback control: Not allowed

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Lean --> rich response diagnosis

ENABLE CONDITIONS

Perform the diagnosis only once when deceleration fuel cut occurs after rapid acceleration. (Pay attention to the oxygen sensor voltage for the timing of the deceleration.)

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

Scheme 250

1. 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.

1. 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 and clear the NG if the following conditions are established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1 time

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Sub feedback control: Not allowed

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Detect the rear oxygen sensor open or short circuit. Judge as NG when the rear oxygen sensor voltage can be determined to be abnormal considering conditions such as intake air amount, engine coolant temperature, main feedback control and deceleration fuel cut.

Scheme 251

ENABLE CONDITION (USED ONLY FOR MALFUNCTION JUDGMENT)

ENABLE CONDITION

Perform the diagnosis once after starting the engine.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 200000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the following conditions are established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

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

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

ENABLE CONDITIONS

Map1

ENGINE SPEED REFERENCE

Perform the diagnosis continuously at idling or at a constant speed after warming up the engine.

1. Abnormality Judgment

Compare the diagnosed value (fsobd) with the threshold value, and if a condition meeting the malfunction criteria below continues for 10 s x 5 time or more, judge that there is a fault in the fuel system.

Judgment Value

JUDGMENT VALUE

Map2

JUDGMENT VALUE

Time Needed for Diagnosis: 10 s x 5 time

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10 s

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

1. When similar driving conditions are repeated 3 times and the result is OK.
2. When "Clear Memory" is performed

Rich side malfunction

1. Purge control solenoid valve control: Not allowed to purge.
2. Heavy fuel judgment control: Not allowed to carry out the heavy judgment.

Memorize the freeze frame data. (For test mode $02)

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.

ENABLE CONDITIONS

Map1

ENGINE SPEED REFERENCE

Perform the diagnosis continuously at idling or at a constant speed after warming up the engine.

1. Abnormality Judgment

Compare the diagnosed value (fsobd) with the threshold value, and if a condition meeting the malfunction criteria below continues for 10 s x 5 time or more, judge that there is a fault in the fuel system.

Judgment Value

JUDGMENT VALUE

Map2

JUDGMENT VALUE

Time Needed for Diagnosis: 10 s x 5 time

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

1. Normality Judgment

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

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10 s

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

1. When similar driving conditions are repeated 3 times and the result is OK.
2. When "Clear Memory" is performed

Rich side malfunction

1. Purge control solenoid valve control: Not allowed to purge.
2. Heavy fuel judgment control: Not allowed to carry out the heavy judgment.

Memorize the freeze frame data. (For test mode $02)

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.

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.

Scheme 252

DRIFT DIAGNOSIS

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 120 s

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

STUCK DIAGNOSIS

ENABLE CONDITION

Always perform diagnosis after 20 seconds have passed since the engine started.

1. Abnormality Judgment

Judge as NG when the following conditions are established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. Normality Judgment

Judge as OK and clear the NG if the following conditions are established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

Detect the open or short circuit of fuel temperature sensor.

Judge as NG if out of specification.

Scheme 253

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

Detect the open or short circuit of fuel temperature sensor.

Judge as NG if out of specification.

Scheme 254

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 255

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 ms

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Stop the continuity to the electronic throttle control motor. (Throttle opening is fixed to 6°.)

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG if out of specification.

Scheme 256

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 24 ms

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed (Only with engine stopped)

Stop the continuity to the electronic throttle control motor. (Throttle opening is fixed to 6°.)

Memorize the freeze frame data. (For test mode $02)

Detect the malfunction of fuel pump control unit.

Judge as NG when the NG signal is sent through a diagnostic line coming from the fuel pump control unit. Fuel pump control unit detects the open or short circuit malfunction for each line, and then sends NG signals if one of them is found NG.

Scheme 257

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2500 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

OFF setting may be needed depending on the NG portion.

Memorize the freeze frame data. (For test mode $02)

Detect the malfunction of wastegate control solenoid valve function.

Judge as NG when becoming high wastegate pressure.

Scheme 258

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Map

ENGINE SPEED REFERENCE

Time Needed for Diagnosis: 2000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG when the terminal output voltage remains Low during outputting the duty signal.

Scheme 259

ENABLE CONDITION

Perform the diagnosis continuously after starting the engine.

Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 640 ms

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

Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

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

Judge as NG when the terminal output voltage remains Low or High during outputting the duty signal.

Scheme 260

ENABLE CONDITION

Perform the diagnosis continuously after starting the engine.

Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 640 ms

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

Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

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 two 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.

1. 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)
2. Misfire every time: FTP 1.5 times misfire, Catalyst damage misfire

1. 360° Interval Difference Method

ENABLE CONDITIONS

Map1

1. AT model

ENGINE SPEED REFERENCE

1. MT model

ENGINE SPEED REFERENCE

Map2

1. AT model (Tumble generator valve open)

ENGINE SPEED REFERENCE

1. AT model (Tumble generator valve closed)

ENGINE SPEED REFERENCE

1. MT model (Tumble generator valve open)

Vehicle speed < 64 km/h (39.8 MPH)

ENGINE SPEED REFERENCE

Vehicle speed > or = 68 km/h (42.3 MPH)

VEHICLE SPEED REFERENCE

1. MT model (Tumble generator valve closed)

Vehicle speed < 64 km/h (39.8 MPH)

VEHICLE SPEED REFERENCE

Vehicle speed > or = 68 km/h (42.3 MPH)

VEHICLE SPEED REFERENCE

1. If conditions are met, it is possible to detect the misfires from idling to high engine speed. However, in case any engine load or breakage occurs, perform with the engine at idle.
2. Perform the diagnosis continuously.

When a misfire occurs, the engine speed 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. Count the number of misfires. If the misfire ratio is higher during 1000 revs, or 200 revs., judge corresponding cylinders as NG.

VALUE CALCULATION REFERENCE

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.

Scheme 261

180° Interval Difference Method

THRESHOLD VALUE POSITION REFERENCE

Scheme 262

360° Interval Difference Method

THRESHOLD VALUE POSITION REFERENCE

Scheme 263

720° Interval Difference Method

THRESHOLD VALUE POSITION REFERENCE

Scheme 264

1. FTP 1.5 times misfire (Misfire occurrence level which influences exhaust gas)
2. Abnormality Judgment

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

JUDGMENT VALUE

Time Needed for Diagnosis: 1000 engine revs.

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

1. Normality Judgment

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1000 engine revs.

1. Catalyst damage misfire (Misfire occurrence level damaging catalyst)
2. Abnormality Judgment

Judgment Value

JUDGMENT VALUE

Map 3

ENGINE SPEED REFERENCE

Time Needed for Diagnosis: 200 engine revs.

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

1. Normality Judgment

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 200 engine revs.

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

1. When similar driving conditions are repeated 3 times and the result is OK.
2. When "Clear Memory" is performed

None

1. Memorize the freeze frame data. (For test mode $02)
2. Memorize the diagnostic value and trouble standard value. (For test mode $06)

Note. For the detection standard, refer to DTC P0301. DTC P0301 CYLINDER 1 MISFIRE DETECTED, Diagnostic Trouble Code (DTC) Detecting Criteria. >

Note. For the detection standard, refer to DTC P0301. DTC P0301 CYLINDER 1 MISFIRE DETECTED, Diagnostic Trouble Code (DTC) Detecting Criteria. >

Note. For the detection standard, refer to DTC P0301. DTC P0301 CYLINDER 1 MISFIRE DETECTED, Diagnostic Trouble Code (DTC) Detecting Criteria. >

Detect the open or short circuit of knock sensor.

Judge as NG if out of specification.

Scheme 265

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Knock compensation

1. Knock compensation final advance/delay angle value = knock compensation value + whole learning compensation value + portional learning compensation value
2. When normal: Knock compensation value = Fixed at 0°CA
3. Failure: Knock compensation value = -5°CA (5°CA retard)
4. Whole learning compensation coefficient update not allowed
5. Portional learning zone compensation value calculation not allowed

Memorize the freeze frame data. (For test mode $02)

Detect the open or short circuit of knock sensor.

Judge as NG if out of specification.

Scheme 266

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 1000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

Knock compensation

1. Knock compensation final advance/delay angle value = knock compensation value + whole learning compensation value + portional learning compensation value
2. When normal: Knock compensation value = Fixed at 0°CA
3. Failure: Knock compensation value = -5°CA (5°CA retard)
4. Whole learning compensation coefficient update not allowed
5. Portional learning zone compensation value calculation not allowed

Memorize the freeze frame data. (For test mode $02)

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.

Scheme 267

Scheme 268

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 3000 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

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.

Scheme 269

Scheme 270

ENABLE CONDITIONS

Perform the diagnosis continuously under 3000 rpm engine speed.

1. Abnormality Judgment

Judge as NG when the following conditions are established.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 10 engine revs.

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

None

Memorize the freeze frame data. (For test mode $02)

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

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

Scheme 271

ENABLE CONDITIONS

Always perform the diagnosis continuously.

1. Abnormality Judgment 1

Judge as NG when the condition where the number of camshaft position sensor signals are less than 3 time during 2 engine revs, continues.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Engine two revolutions x 50

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

1. Normality Judgement 1

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

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Two engine revolutions

1. Abnormality Judgment 2

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 3000 ms

1. Normality Judgement 2

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

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

1. When the OK driving cycle is completed 3 times in a row
2. When "Clear Memory" is performed

1. Ignition timing whole learning compensation: Enter the initial value (whole learning compensation factor = 0.5, Variable amount of whole learning compensation factor = 0.25) to the whole learning compensation factor and variable amount of whole learning compensation factor when IG OFF, and then make the whole learning incomplete. Enter the initial value (whole learning compensation factor = 0.5, Variable amount of whole learning compensation factor = 0.25) to the whole learning compensation factor and variable amount of whole learning compensation factor when making a normality judgment from abnormality judgment, and then make the whole learning incomplete.
2. Ignition timing partial learning compensation: Enter the initial value (0°CA) to the compensation value of partial learning zone with IG OFF. Enter the initial value (0°CA) to the compensation value of the partial learning zone when making a normality judgment --> abnormality judgment.
3. AVCS control

1. Maximum timing retard learning is not complete or maximum timing retard learning completion is not experienced.
2. ISC feedback compensation: Do not perform the AVCS actual timing advance compensation.
3. Make the OCV driving Duty to be the given value (9.36%).

Memorize the freeze frame data. (For test mode $02)

Note. For the detection standard, refer to DTC P0340. DTC P0340 CAMSHAFT POSITION SENSOR "A" CIRCUIT (BANK 1 OR SINGLE SENSOR), Diagnostic Trouble Code (DTC) Detecting Criteria. >

Detect NG judging from secondary air delivery pipe pressure, pulse of secondary air delivery pipe pressure and secondary air pipe airflow amount.

ENABLE CONDITIONS

Perform diagnosis during secondary air pump operation

Measure secondary air delivery pipe pressure, pulse of secondary air delivery pipe pressure and secondary air pipe airflow amount.

Scheme 272

Pump supply pressure check

Perform the system function diagnosis with how much the pressure rises when the secondary air pump is turned from OFF to ON.

Judge as NG if delivery pipe pressure does not rise though it should when the secondary air pump turns OFF --> ON.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2000 ms + 2800 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 2000 ms + 2800 ms

Combination valve one side closed pulse diagnosis

Perform close stuck diagnosis of the LH combination valve using delivery pipe pressure pulse when the RH combination valve is closed.

Calculate the voltage pulse of the pump delivery pipe pressure when the RH combination valve is closed and the LH combination valve is open. The calculation of delivery pipe pressure should be large when the LH combination valve is open. Judge that the LH combination valve is close stuck if the calculation is small.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

Perform close stuck diagnosis of the RH combination valve using delivery pipe pressure pulse when the LH combination valve is closed.

Calculate the voltage pulse of the pump delivery pipe pressure when the LH combination valve is closed and the RH combination valve is open. The calculation of delivery pipe pressure should be large when the RH combination valve is open. Judge that the RH combination valve is close stuck if the calculation is small.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

Combination valve both closed pulse diagnosis

Perform open stuck diagnosis of both combination valves using delivery pipe pressure pulse when both combination valves are closed. Determine which side of valves is stuck open by comparing secondary air flow amount when RH combination valve is closed with that when LH combination valve is closed.

Calculate voltage pulse of the pump supply pipe pressure when both combination valves are closed. The calculation should be small because there is no pulse from supply pipe pressure with both combination valves closed. When the calculation is large, determine that either of the combination valves is stuck open. Determine which side of valves is stuck open by comparing secondary air flow amount when the RH combination valve is closed with that when the LH combination valve is closed. Air flow amount is larger on the open stuck valve.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

Combination valve changeover pressure diagnosis

Perform the RH combination valve stuck closed diagnosis with the variation of delivery pipe pressure when the RH combination valve turns closed --> open.

Delivery pipe pressure should vary when the RH combination valve turns closed --> open. When the variation is small, determine that the RH combination valve is stuck closed.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

Perform the LH combination valve stuck closed diagnosis with the variation of delivery pipe pressure when the LH combination valve turns open --> closed.

Delivery pipe pressure should vary when the LH combination valve turns open --> closed. When the variation is small, determine that the LH combination valve is stuck closed.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

Overflow diagnosis

Perform secondary air system flow abnormality diagnosis using both sides of combination valves secondary air amount when both are closed.

Judge as secondary air system flow abnormality either if there is excessive secondary air flow amount with the RH combination valve closed, or if there is excessive secondary airflow amount with the LH combination valve closed.

1. Abnormality Judgment

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

JUDGMENT VALUE

P0RL: Both banks all closed pressure

P0R: Right bank all closed pressure

P0L: Left bank all closed pressure

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

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

1. Normality Judgment

Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.

Judgment Value

JUDGMENT VALUE

P0RL: Both banks all closed pressure

P0R: Right bank all closed pressure

P0L: Left bank all closed pressure

Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms

Map1

ENGINE SPEED REFERENCE

Map2

ENGINE SPEED REFERENCE

Map 3

THRESHOLD VALUE REFERENCE

Map4