DIAGNOSTIC METHOD 2 Subaru Outback BR facelift

DIAGNOSTIC METHOD 2

Detect the malfunction by the cumulative value obtained from the amount of variation in lambda change.

Scheme 163

1. Abnormality Judgment

Judge as NG when the following conditions are established.

JUDGMENT VALUE

MAP (BIN5 MODEL)

MAP (ULEV MODEL)

Time Needed for Diagnosis: 90 seconds

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

Time Needed for Diagnosis: 90 seconds

Note. For the detection standard, refer to DTC P014C O2 SENSOR SLOW RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1) .

Note. For the detection standard, refer to DTC P014C O2 SENSOR SLOW RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1) .

Note. For the detection standard, refer to DTC P014C O2 SENSOR SLOW RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1) .

Note. For the detection standard, refer to DTC P0131 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 1) .

Note. For the detection standard, refer to DTC P0132 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 1) .

Note. For the detection standard, refer to DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 1) .

Note. For the detection standard, refer to DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2) .

Note. For the detection standard, refer to DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2) .

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

For diagnosis, detect the trouble by processing the lambda waveform in normal driving without forcibly changing the target air fuel ratio.

Scheme 164

Detect the malfunction depending on the average value of time necessary for lambda to inverse the air fuel ratio from "Lean --> Rich --> Lean" to "Rich --> Lean --> Rich".

Scheme 165

1. Abnormality Judgment

Judge as NG when the following conditions are established.

JUDGMENT VALUE

Time Needed for Diagnosis: 50 times of inversion

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

Time Needed for Diagnosis: 50 times of inversion

Detect the malfunction by calculating the average amplitude of l.

Scheme 166

1. Abnormality Judgment

Judge as NG when the following conditions are established.

JUDGMENT VALUE

Time Needed for Diagnosis: 11250 time(s) x 8 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

Time Needed for Diagnosis: 11250 time(s) x 8 ms

Note. For the detection standard, refer to DTC P015A O2 SENSOR DELAYED RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1) .

Note. For the detection standard, refer to DTC P015A O2 SENSOR DELAYED RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1) .

Note. For the detection standard, refer to DTC P015A O2 SENSOR DELAYED RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1) .

Note. For the detection standard, refer to DTC P0140 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK1 SENSOR2) .

Note. For the detection standard, refer to DTC P0141 O2 SENSOR HEATER CIRCUIT (BANK1 SENSOR2) .

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.

1. Abnormality Judgment

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

JUDGMENT VALUE

MAP 2

Time Needed for Diagnosis: 10 s x 10 time(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

Time Needed for Diagnosis: 10 s

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.

1. Abnormality Judgment

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

JUDGMENT VALUE

MAP 2

Time Needed for Diagnosis: 10 s x 10 time(s)

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

1. Normality Judgment

Judge as OK if the status that the criteria below are met continues for 10 seconds.

JUDGMENT VALUE

Time Needed for Diagnosis: 10 s

Note. For the detection standard, refer to DTC P0171 SYSTEM TOO LEAN (BANK 1) .

Note. For the detection standard, refer to DTC P0172 SYSTEM TOO RICH (BANK 1) .

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.

1. Abnormality Judgment

Judge as NG when the following conditions are established.

JUDGMENT VALUE

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

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

64 ms + TOILCNT ms (when at 64 ms)

Where, TOILCNT is determined as follows

TOILCNT = 0 at idle switch ON

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

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

t = 3600000 ms - 60000 ms x Ti (t > or = 2400000)

Ti = The lowest coolant temperature after starting the engine.

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

Time Needed for Diagnosis: Less than 1 second

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

Judge as NG when outside of the judgment value.

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

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

Time Needed for Diagnosis: Less than 1 second

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

Judge as NG when outside of the judgment value.

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

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

Time Needed for Diagnosis: Less than 1 second

Based on the self-diagnostic result of the injector driving IC, judge the injector driving circuit as normal or abnormal.

Injector driving IC detects the status of "fuel remains injected" or "fuel is not injected" as a malfunction.

1. Abnormality Judgment

Judge as NG when the following conditions are established.

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 following conditions are established.

JUDGMENT VALUE

Time Needed for Diagnosis: Less than 1 second

Note. For the detection standard, refer to DTC P0201 INJECTOR #1 .

Note. For the detection standard, refer to DTC P0201 INJECTOR #1 .

Note. For the detection standard, refer to DTC P0201 INJECTOR #1 .

Note. For the detection standard, refer to DTC P0201 INJECTOR #1 .

Note. For the detection standard, refer to DTC P0201 INJECTOR #1 .

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

Judge as NG if out of specification.

Scheme 167

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

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

Time Needed for Diagnosis: 24 ms

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

Judge as NG if out of specification.

Scheme 168

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

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

Time Needed for Diagnosis: 24 ms

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 169

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

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

Time Needed for Diagnosis: Less than 1 second

Note. For the detection standard, refer to DTC P0301 CYLINDER 1 MISFIRE DETECTED .

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 120° Interval Difference Method 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 360° Interval Difference Method

When a misfire occurs, the engine speed will decrease 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.

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 170

Note. For the detection standard, refer to DTC P0301 CYLINDER 1 MISFIRE DETECTED .

Note. For the detection standard, refer to DTC P0301 CYLINDER 1 MISFIRE DETECTED .

Note. For the detection standard, refer to DTC P0301 CYLINDER 1 MISFIRE DETECTED .

Note. For the detection standard, refer to DTC P0301 CYLINDER 1 MISFIRE DETECTED .

Note. For the detection standard, refer to DTC P0301 CYLINDER 1 MISFIRE DETECTED .

Detect the open or short circuit of knock sensor.

Judge as NG if out of specification.

Scheme 171

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

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

Time Needed for Diagnosis: Less than 1 second

Detect the open or short circuit of knock sensor.

Judge as NG if out of specification.

Scheme 172

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

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

Time Needed for Diagnosis: Less than 1 second

Note. For the detection standard, refer to DTC P0327 KNOCK SENSOR 1 CIRCUIT LOW (BANK 1 OR SINGLE SENSOR) .

Note. For the detection standard, refer to DTC P0328 KNOCK SENSOR 1 CIRCUIT HIGH (BANK 1 OR SINGLE SENSOR) .

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 173

Scheme 174

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

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

Time Needed for Diagnosis: Less than 1 second

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 of crankshaft.

Scheme 175

Scheme 176

1. Abnormality Judgment

Judge as NG when the following conditions are established.

JUDGMENT VALUE

Time Needed for Diagnosis: 10 engine revs. 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

Time Needed for Diagnosis: Less than 1 second

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

When there is no camshaft position signal input continuously, judge as NG.

Scheme 177

Scheme 178

1. Abnormality Judgment