Engine Control System (Introduction): Other Infiniti QX50 I

DETAILED FLOW

1. GET INFORMATION FOR SYMPTOM Get the detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurred) using the "Diagnostic Work Sheet". (Refer to " «DIAGNOSTIC WORK SHEET»(ref-616999-S02892610302014052000000) ".) Ask if the customer requests I/M examination. Malfunction information, obtained: GO TO 2. No Malfunction information, but a request for I/M examination: GO TO 13 .
2. CHECK DTC Check DTC. Perform the following procedure if DTC is displayed. Record DTC and freeze frame data. (Print them out with CONSULT or GST.) Erase DTC. (Refer to " «ON BOARD DIAGNOSIS FUNCTION»(ref-616999-S00404725702014052000000) " or " «CONSULT FUNCTION»(ref-616999-S11342544512014052000000) ".) Study the relationship between the cause detected by DTC and the symptom described by the customer. (Symptom Table is useful. Refer to " «SYMPTOM TABLE»(ref-616998-S05725403192014052000000) ".) Check related service bulletins for information. Are any symptoms described and any DTCs detected? Symptom is described, DTC is detected: GO TO 3. Symptom is described, DTC is not detected: GO TO 4 . Symptom is not described, DTC is detected: GO TO 5 .
3. CONFIRM THE SYMPTOM Try to confirm the symptom described by the customer (except MIL ON). Also study the normal operation and fail-safe related to the symptom. Refer to " «DESCRIPTION»(ref-616998-S29892083172014052000000) " and " «FAIL SAFE»(ref-616998-S16293978252014052000000) ". Diagnosis Work Sheet is useful to verify the incident. Verify relation between the symptom and the condition when the symptom is detected. : GO TO 5 .
4. CONFIRM THE SYMPTOM Try to confirm the symptom described by the customer. Also study the normal operation and fail-safe related to the symptom. Refer to " «DESCRIPTION»(ref-616998-S29892083172014052000000) " and " «FAIL SAFE»(ref-616998-S16293978252014052000000) ". Diagnosis Work Sheet is useful to verify the incident. Verify relation between the symptom and the condition when the symptom is detected. : GO TO 6 .
5. PERFORM DTC CONFIRMATION PROCEDURE Perform DTC CONFIRMATION PROCEDURE for the displayed DTC, and then make sure that DTC is detected again. If two or more DTCs are detected, refer to " «DTC INSPECTION PRIORITY CHART O»(ref-616998-S11018905742014052000000) " and determine trouble diagnosis order. NOTE: Freeze frame data is useful if the DTC is not detected. Perform Component Function Check if DTC CONFIRMATION PROCEDURE is not included on Service Information. This simplified check procedure is an effective alternative though DTC cannot be detected during this check. If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC CONFIRMATION PROCEDURE. Is DTC detected? YES: GO TO 10 . NO: Check according to " «INTERMITTENT INCIDENT»(ref-616989-S00672575652014052000000) ".
6. PERFORM BASIC INSPECTION Perform " «BASIC INSPECTION: SPECIAL REPAIR REQUIREMENT»(ref-616999-S17211656672014052000000) ". Do you have CONSULT? YES: GO TO 7. NO: GO TO 9 .
7. PERFORM SPEC IN DATA MONITOR MODE With CONSULT Make sure that "MAS A/F SE-B1", "MAS A/F SE-B2", "B/FUEL SCHDL", "A/F ALPHA-B1" and "A/F ALPHA-B2" are within the SP value using CONSULT "SPEC" in "DATA MONITOR" mode. Refer to " «COMPONENT FUNCTION CHECK»(ref-616999-S32408398382014052000000) ". Is the measurement value within the SP value? YES: GO TO 9 . NO: GO TO 8.
8. DETECT MALFUNCTIONING PART BY TROUBLE DIAGNOSIS - SPECIFICATION VALUE Detect malfunctioning part according to " «DIAGNOSIS PROCEDURE»(ref-616999-S01322149262014052000000) ". Is a malfunctioning part detected? YES: GO TO 11 . NO: GO TO 9.
9. DETECT MALFUNCTIONING SYSTEM BY SYMPTOM TABLE Detect malfunctioning system according to " «SYMPTOM TABLE»(ref-616998-S05725403192014052000000) " based on the confirmed symptom in step 4 , and determine the trouble diagnosis order based on possible causes and symptoms. : GO TO 10.
10. DETECT MALFUNCTIONING PART BY DIAGNOSIS PROCEDURE Inspect according to Diagnosis Procedure of the system. NOTE: The Diagnosis Procedure in Engine Control article is described based on open circuit inspection. A short circuit inspection is also required for the circuit check in the Diagnosis Procedure. For details, refer to " «CIRCUIT INSPECTION»(ref-616989-S29523064592014052000000) ". Is a malfunctioning part detected? YES: GO TO 11. NO: Monitor input data from related sensors or check voltage of related ECM terminals using CONSULT. Refer to " «REFERENCE VALUE»(ref-616998-S15440681482014052000000) ".
11. REPAIR OR REPLACE THE MALFUNCTIONING PART Repair or replace the malfunctioning part. Reconnect parts or connectors disconnected during Diagnosis Procedure again after repair and replacement. Check DTC. If DTC is displayed, erase it. Refer to " «ON BOARD DIAGNOSIS FUNCTION»(ref-616999-S00404725702014052000000) " or " «CONSULT FUNCTION»(ref-616999-S11342544512014052000000) ". : GO TO 12.
12. FINAL CHECK When DTC was detected in step 2 , perform DTC CONFIRMATION PROCEDURE or Component Function Check again, and then make sure that the malfunction have been completely repaired. When symptom was described from the customer, refer to confirmed symptom in step 3 or 4 , and make sure that the symptom is not detected. Is DTC detected and does symptom remain? YES-1: DTC is detected: GO TO 10 . YES-2: Symptom remains: GO TO 6 . NO-1: No request for I/M examination from the customer: Before returning the vehicle to the customer, always erase unnecessary DTC in ECM and TCM (Transmission Control Module). Refer to " «ON BOARD DIAGNOSIS FUNCTION»(ref-616999-S00404725702014052000000) " or " «CONSULT FUNCTION»(ref-616999-S11342544512014052000000) ". NO-2: I/M examination, requested from the customer: GO TO 13.
13. PREPARE FOR I/M EXAMINATION Set SRT codes. Refer to " «SRT SET DRIVING PATTERN»(ref-616999-S36663584622014052000000) ". Erase permanent DTCs. Refer to " «DESCRIPTION»(ref-616999-S18409092442014052000000) ". : INSPECTION END.

ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM): Special Repair Requirement

1. CHECK ECM PART NUMBER Check ECM part number to see whether it is blank ECM or not. NOTE: Part number of blank ECM is 23703 - xxxxx. Check the part number when ordering ECM or with the one included in the label on the container box. Is the ECM a blank ECM? YES: GO TO 2. NO: GO TO 4 .
2. SAVE ECM PART NUMBER Read out the part number from the old ECM and save the number, following the programming instructions. Refer to "CONSULT Operation Information". NOTE: The ECM part number is saved in CONSULT. Even when ECM part number is not saved in CONSULT, go to 3. : GO TO 3.
3. PERFORM ECM PROGRAMMING After replacing ECM, perform the ECM programming. Refer to "CONSULT Operation Information". NOTE: During programming, maintain the following conditions: Ignition switch: ON Electric load: OFF Brake pedal: Not depressed Battery voltage: 12 - 13.5 V (Be sure to check the value of battery voltage by selecting "BATTERY VOLT" in "Data monitor" of CONSULT.) : GO TO 5 .
4. REPLACE ECM Replace ECM. : GO TO 5.
5. PERFORM INITIALIZATION OF IVIS (NATS) SYSTEM AND REGISTRATION OF ALL IVIS (NATS) IGNITION KEY IDS Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to " «ECM RE-COMMUNICATING FUNCTION: SPECIAL REPAIR REQUIREMENT»(ref-617017-S21390778342014052000000) ". : GO TO 6.
6. PERFORM VIN REGISTRATION Perform VIN registration. Refer to " «VIN REGISTRATION: SPECIAL REPAIR REQUIREMENT»(ref-616999-S09684060792014052000000) ". : GO TO 7.
7. PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING Perform accelerator pedal released position learning. Refer to " «ACCELERATOR PEDAL RELEASED POSITION LEARNING: SPECIAL REPAIR REQUIREMENT»(ref-616999-S17738204502014052000000) ". : GO TO 8.
8. PERFORM THROTTLE VALVE CLOSED POSITION LEARNING Perform throttle valve closed position learning. Refer to " «THROTTLE VALVE CLOSED POSITION LEARNING: SPECIAL REPAIR REQUIREMENT»(ref-616999-S07991613132014052000000) ". : GO TO 9.
9. PERFORM IDLE AIR VOLUME LEARNING Perform idle air volume learning. Refer to " «IDLE AIR VOLUME LEARNING: SPECIAL REPAIR REQUIREMENT»(ref-616999-S34763962652014052000000) ". : END

ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL MODULE): Special Repair Requirement

1. PERFORM IDLE AIR VOLUME LEARNING Refer to " «IDLE AIR VOLUME LEARNING: SPECIAL REPAIR REQUIREMENT»(ref-616999-S34763962652014052000000) ". : END

IDLE SPEED: Special Repair Requirement

1. CHECK IDLE SPEED With CONSULT Check idle speed in "DATA MONITOR" mode with CONSULT. With GST Check idle speed with Service $01 of GST. : INSPECTION END

VIN REGISTRATION: Special Repair Requirement

1. CHECK VIN Check the VIN of the vehicle and note it. Refer to " «INFORMATION ABOUT IDENTIFICATION OR MODEL CODE»(ref-616989-S25389765542014052000000) ". : GO TO 2.
2. PERFORM VIN REGISTRATION With CONSULT Turn ignition switch ON and engine stopped. Select "VIN REGISTRATION" in "WORK SUPPORT" mode. Follow the instruction of CONSULT display. : END

ACCELERATOR PEDAL RELEASED POSITION LEARNING: Special Repair Requirement

1. START Make sure that accelerator pedal is fully released. Turn ignition switch ON and wait at least 2 seconds. Turn ignition switch OFF and wait at least 10 seconds. Turn ignition switch ON and wait at least 2 seconds. Turn ignition switch OFF and wait at least 10 seconds. : END

THROTTLE VALVE CLOSED POSITION LEARNING: Special Repair Requirement

1. START WITH CONSULT Turn ignition switch ON. Select "CLSD THL POS LEARN" in "WORK SUPPORT" mode. Follow the instructions on the CONSULT display. Turn ignition switch OFF and wait at least 10 seconds. Check that throttle valve moves during the above 10 seconds by confirming the operating sound. WITHOUT CONSULT Start the engine. NOTE: Engine coolant temperature is 25°C (77°F) or less before engine starts. Warm up the engine. NOTE: Raise engine coolant temperature until it reaches 65°C (149°F) or more. Turn ignition switch OFF and wait at least 10 seconds. Check that throttle valve moves during the above 10 seconds by confirming the operating sound. : END

MIXTURE RATIO SELF-LEARNING VALUE CLEAR: Special Repair Requirement

1. START With CONSULT Start engine and warm it up to normal operating temperature. Select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT. Clear mixture ratio self-learning value by touching "CLEAR". With GST Start engine and warm it up to normal operating temperature. Turn ignition switch OFF. Disconnect mass air flow sensor (bank 1) harness connector. Restart engine and let it idle for at least 5 seconds. Stop engine and reconnect mass air flow sensor (bank 1) harness connector. Select Service $03 with GST. Make sure DTC P0102 is detected. Select Service $04 with GST to erase the DTC P0102. : END

OUTLINE

In order to set all SRTs, the self-diagnoses as in the "SRT ITEM" table must have been performed at least once. Each diagnosis may require actual driving for a long period of time under various conditions.

SRT ITEM

The table below shows required self-diagnostic items to set the SRT to "CMPLT".

SRT SERVICE PROCEDURE

If a vehicle has failed the state emissions inspection due to one or more SRT items indicating "INCMP", review the flowchart diagnostic sequence, referring to the following flowchart.

Scheme 53

SRT Set Driving Pattern

Scheme 54

1. The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driving habits, etc.
2. "Zone A" is the fastest time where required for the diagnosis under normal conditions*. If the diagnosis is not completed within "Zone A", the diagnosis can still be performed within "Zone B". *: Normal conditions Sea level Flat road Ambient air temperature: 20 - 30°C (68 - 86°F)

Note. Diagnosis is performed as quickly as possible under normal conditions. However, under other conditions, diagnosis may also be performed. [For example: ambient air temperature other than 20 - 30°C (68 - 86°F)]

Scheme 55

Scheme 56

1. CHECK DTC Check DTC. Is any DTC detected? YES: Repair malfunction(s) and erase DTC. Refer to " «DTC INDEX»(ref-616998-S13806969972014052000000) ". NO: GO TO 2.
2. CHECK SRT STATUS With CONSULT Select "SRT STATUS" in "DTC & SRT CONFIRMATION" mode with CONSULT. Without CONSULT Perform "SRT status" mode with " «ON BOARD DIAGNOSIS FUNCTION»(ref-616999-S00404725702014052000000) ". With GST Select Service $01 with GST. Is SRT code(s) set? YES: GO TO 12 . NO-1: With CONSULT: GO TO 3. NO-2: Without CONSULT: GO TO 4 .
3. DTC CONFIRMATION PROCEDURE Select "SRT WORK SUPPORT" in "DTC & SRT CONFIRMATION" mode with CONSULT. For SRT(s) that is not set, perform the corresponding "DTC CONFIRMATION PROCEDURE" according to the "Performance Priority" in the "SRT ITEM" table. Refer to " «DESCRIPTION»(ref-616999-S02076040782014052000000) ". Check DTC. Is any DTC detected? YES: Repair malfunction(s) and erase DTC. Refer to " «DTC INDEX»(ref-616998-S13806969972014052000000) ". NO: GO TO 11 .
4. PERFORM ROAD TEST Check the "Performance Priority" in the "SRT ITEM" table. Refer to " «DESCRIPTION»(ref-616999-S02076040782014052000000) ". Perform the most efficient SRT set driving pattern to set the SRT properly. Refer to " «SRT SET DRIVING PATTERN»(ref-616999-S36663584622014052000000) ". In order to set all SRTs, the SRT set driving pattern must be performed at least once. : GO TO 5.
5. PATTERN 1 Check the vehicle condition; Engine coolant temperature is -10 to 35°C (14 to 95°F). Fuel tank temperature is more than 0°C (32°F). Start the engine. Keep engine idling until the engine coolant temperature is greater than 70°C (158°F) NOTE: ECM terminal voltage is follows; Engine coolant temperature -10 to 35°C (14 to 95°F): 3.0 - 4.3 V 70°(158°F): Less than 4.1 V Fuel tank temperature: Less than 1.4 V Refer to " «REFERENCE VALUE»(ref-616998-S15440681482014052000000) ". : GO TO 6.
6. PATTERN 2 Drive the vehicle. And depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then release the accelerator pedal and keep it released for more than 10 seconds. Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH) again NOTE: Checking the vehicle speed with GST is advised. When steady-state driving is performed again even after it is interrupted, each diagnosis can be conducted. In this case, the time required for diagnosis may be extended. : GO TO 7.
7. PATTERN 3 Operate vehicle following the driving pattern shown in the figure below. Release the accelerator pedal during deceleration of vehicle speed from 90 km/h (56 MPH) to 0 km/h (0 MPH). : GO TO 8.
8. PATTERN 4 Operate vehicle, following the driving pattern shown in the figure below. Drive the vehicle in a proper gear at 60 km/h (38 MPH) and maintain the speed. Release the accelerator pedal fully at least 5 seconds. Repeat the above two steps at least 5 times. : GO TO 9.
9. PATTERN 5 The accelerator pedal must be held very steady during steady-state driving. If the accelerator pedal is moved, the test must be conducted again. : GO TO 10.
10. PATTERN 6 Start the engine and wait at least 2 hours. Turn ignition OFF and wait at least 90 minutes. : GO TO 11.
11. CHECK SRT STATUS With CONSULT Select "SRT STATUS" in "DTC & SRT CONFIRMATION" mode with CONSULT. Without CONSULT Perform "SRT status" mode with " «ON BOARD DIAGNOSIS FUNCTION»(ref-616999-S00404725702014052000000) ". With GST Select Service $01 with GST. Is SRT(s) set? YES: GO TO 12. NO: Call TECH LINE or take appropriate action.
12. CHECK PERMANENT DTC NOTE: Permanent DTC cannot be checked with a tool other than CONSULT or GST. With CONSULT Select "SRT STATUS" in "DTC & SRT CONFIRMATION" mode with CONSULT. With GST Select Service $0A with GST. Is permanent DTC(s) detected? YES: Go to " «DESCRIPTION»(ref-616999-S02076040782014052000000) ". NO: END

INPUT/OUTPUT SIGNAL CHART

VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION

In addition, the amount of fuel injected is compensated to improve engine performance under various operating conditions as listed below.

< Fuel increase >

1. During warm-up
2. When starting the engine
3. During acceleration
4. Hot-engine operation
5. When selector lever is changed from N to D
6. High-load, high-speed operation

< Fuel decrease >

1. During deceleration
2. During high engine speed operation

Scheme 57

The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control. The three way catalyst 1 can better reduce CO, HC and NOx emissions. This system uses A/F sensor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The ECM adjusts the injection pulse width according to the sensor voltage signal. For more information about A/F sensor 1, refer to " DESCRIPTION ". This maintains the mixture ratio within the range of stoichiometric (ideal air-fuel mixture). This stage is referred to as the closed loop control condition.

Heated oxygen sensor 2 is located downstream of the three way catalyst 1. Even if the switching characteristics of A/F sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal from heated oxygen sensor 2.

1. Open Loop Control The open loop system condition refers to when the ECM detects any of the following conditions. Feedback control stops in order to maintain stabilized fuel combustion. Deceleration and acceleration High-load, high-speed operation Malfunction of A/F sensor 1 or its circuit Insufficient activation of A/F sensor 1 at low engine coolant temperature High engine coolant temperature During warm-up After shifting from N to D When starting the engine

MIXTURE RATIO SELF-LEARNING CONTROL

The mixture ratio feedback control system monitors the mixture ratio signal transmitted from A/F sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes during operation (i.e., fuel injector clogging) directly affect mixture ratio.

Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is then computed in terms of "injection pulse duration" to automatically compensate for the difference between the two ratios.

"Fuel trim" refers to the feedback compensation value compared against the basic injection duration. Fuel trim includes short-term fuel trim and long-term fuel trim.

"Short-term fuel trim" is the short-term fuel compensation used to maintain the mixture ratio at its theoretical value. The signal from A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an increase in fuel volume if it is lean.

"Long-term fuel trim" is overall fuel compensation carried out over time to compensate for continual deviation of the short-term fuel trim from the central value. Continual deviation will occur due to individual engine differences, wear over time and changes in the usage environment.

Scheme 58

Two types of systems are used.

1. Sequential Multiport Fuel Injection System Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used when the engine is running.
2. Simultaneous Multiport Fuel Injection System Fuel is injected simultaneously into all six cylinders twice each engine cycle. In other words, pulse signals of the same width are simultaneously transmitted from the ECM. The six injectors will then receive the signals two times for each engine cycle. This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.

FUEL SHUT-OFF

Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or operation of the vehicle at excessively high speeds.

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Scheme 78

BASIC ASCD SYSTEM

Refer to Owner's Manual for ASCD operating instructions.

Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/h (25 MPH) and 144 km/h (89 MPH).

ECM controls throttle angle of electric throttle control actuator to regulate engine speed.

Operation status of ASCD is indicated by CRUISE indicator and SET indicator in combination meter. If any malfunction occurs in the ASCD system, it automatically deactivates control.

Note. Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.

Scheme 79

The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.

The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the vapor is stored there when the engine is not operating or when refueling to the fuel tank.

The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is proportionally regulated as the air flow increases.

EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and idling.

Scheme 80

Scheme 81

Note. Do not use soapy water or any type of solvent while installing vacuum hose or purge hoses.

INPUT SIGNAL CHART

OUTPUT SIGNAL CHART

Scheme 82

This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve.

The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.

Scheme 83

VVEL (Variable Valve Event & Lift) is a system that controls valve event and valve lift continuously. Rotational movement of the drive shaft equipped with eccentric cam is transmitted to output cam via the rocker arm and two kinds of links to depress the intake valve. ECM decides the target valve lift according to the driving condition and sends the command signal to the VVEL control module. The VVEL control module controls the rotation of the control shaft using the VVEL actuator motor and changes the movement of the output cam by shifting the link supporting point. As a result, valve lift changes continuously to improve engine output and response.

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA

The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, absolute throttle position, base fuel schedule and intake air temperature at the moment a malfunction is detected.

Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data. The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT or GST. The 1st trip freeze frame data can only be displayed on the CONSULT screen.

Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the following priorities to update the data.

For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was saved in the 2nd trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different malfunction is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the ECM memory.

Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM memory is erased.

COUNTER SYSTEM CHART

Scheme 84

Driving Pattern B

Refer to " DIAGNOSIS DESCRIPTION: DRIVING PATTERN ".

Driving Pattern C

Refer to " DIAGNOSIS DESCRIPTION: DRIVING PATTERN ".

Example

If the stored freeze frame data is as per the following

Engine speed: 850 RPM, Calculated load value: 30%, Engine coolant temperature: 80°C (176°F)

To be satisfied with driving pattern C, the vehicle should run under the following conditions

Engine speed: 475 - 1, 225 RPM, Calculated load value: 27 - 33%, Engine coolant temperature: more than 70°C (158°F)

Scheme 85

Driving Pattern A

Refer to " DIAGNOSIS DESCRIPTION: DRIVING PATTERN ".

Driving Pattern B

Refer to " DIAGNOSIS DESCRIPTION: DRIVING PATTERN ".

DRIVING PATTERN A

Driving pattern A means a trip satisfying the following conditions.

1. Engine speed reaches 400 RPM or more.
2. Engine coolant temperature rises by 20°C (36°F) or more after starting the engine.
3. Engine coolant temperature reaches 70°C (158°F) or more.
4. The ignition switch is turned from ON to OFF.

Note. When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern A. When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern A.

DRIVING PATTERN B

Driving pattern B means a trip satisfying the following conditions.

1. Engine speed reaches 400 RPM or more.
2. Engine coolant temperature reaches 70°C (158°F) or more.
3. Vehicle speed of 70 - 120 km/h (44 - 75 MPH) is maintained for 60 seconds or more under the control of closed loop.
4. Vehicle speed of 30 - 60 km/h (19 - 37 MPH) is maintained for 10 seconds or more under the control of closed loop.
5. Under the closed loop control condition, the following state reaches 12 seconds or more in total: Vehicle speed of 4 km/h (2 MPH) or less with idling condition.
6. The state of driving at 10 km/h (7 MPH) or more reaches 10 minutes or more in total.
7. A lapse of 22 minutes or more after engine start.

Note. Drive the vehicle at a constant velocity. When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern B. When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern B.

DRIVING PATTERN C

Driving pattern C means operating vehicle as per the following

The following conditions should be satisfied at the same time

Engine speed: (Engine speed in the freeze frame data) ±375 RPM

Calculated load value: (Calculated load value in the freeze frame data) x (1±0.1) [%]

Engine coolant temperature condition

1. When the freeze frame data shows lower than 70°C (158°F), engine coolant temperature should be lower than 70°C (158°F).
2. When the freeze frame data shows higher than or equal to 70°C (158°F), engine coolant temperature should be higher than or equal to 70°C (158°F).

Note. When the same malfunction is detected regardless of the above vehicle conditions, reset the counter of driving pattern C. When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern C. The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC is stored in ECM.

DRIVING PATTERN D

Driving pattern D means a trip satisfying the following conditions.

1. The state of driving at 40 km/h (25 MPH) reaches 300 seconds or more in total.
2. Idle speed lasts 30 seconds or more.
3. A lapse of 600 seconds or more after engine start.

Note. When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern D. When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern D.

SRT SET TIMING

SRT is set as "CMPLT" after self-diagnosis has been performed one or more times. Completion of SRT is done regardless of whether the result is OK or NG. The set timing is different between OK and NG results and is shown in the table below.

When all SRT related self-diagnoses show OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will indicate "CMPLT". --> Case 1 above

When all SRT related self-diagnoses show OK results through several different cycles, the SRT will indicate "CMPLT" at the time the respective self-diagnoses have at least one OK result. --> Case 2 above

If one or more SRT related self-diagnoses show NG results in 2 consecutive cycles, the SRT will also indicate "CMPLT". --> Case 3 above

The table above shows that the minimum number of cycles for setting SRT as "INCMP" is the number one (1) for each self-diagnosis (Case 1 & 2) or the number two (2) for one of self-diagnoses (Case 3). However, in preparation for the state emissions inspection, it is unnecessary for each self-diagnosis to be executed twice (Case 3) for the following reasons

1. The SRT will indicate "CMPLT" at the time the respective self-diagnoses have one (1) OK result.
2. The emissions inspection requires "CMPLT" of the SRT only with OK self-diagnosis results.
3. During SRT driving pattern, the 1st trip DTC (NG) is detected prior to "CMPLT" of SRT and the self-diagnosis memory must be erased from the ECM after repair.
4. If the 1st trip DTC is erased, all the SRT will indicate "INCMP". NOTE: SRT can be set as "CMPLT" together with the DTC(s). Therefore, DTC check must always be carried out prior to the state emission inspection even though the SRT indicates "CMPLT".

BULB CHECK MODE

Description

This function allows damage inspection in the MIL bulb (blown, open circuit, etc.).

Operation Procedure

1. Turn ignition switch ON.
2. The MIL on the instrument panel should stay ON. If it remains OFF, check MIL circuit. Refer to " «DIAGNOSIS PROCEDURE»(ref-616998-S10343945912014052000000) ".

SRT STATUS MODE

Description

This function allows to read if ECM has completed the self-diagnoses of major emission control systems and components. For SRT, refer to " DIAGNOSIS DESCRIPTION: SYSTEM READINESS TEST (SRT) CODE ".

Operation Procedure

Scheme 86

1. Turn ignition switch ON and wait 20 seconds.
2. SRT status is indicated as shown below. ECM continues to illuminate MIL if all SRT codes are set. ECM blinks MIL for about 10 seconds if all SRT codes are not set.

MALFUNCTION WARNING MODE

Description

In this function ECM turns on or blinks MIL when it detects a malfunction in the emission control system components and/or the powertrain control components (which affect vehicle emissions) to inform the driver that a malfunction has been detected.

Operation Procedure

1. Turn ignition switch ON.
2. Check that MIL illuminates. If it remains OFF, check MIL circuit. Refer to " «DIAGNOSIS PROCEDURE»(ref-616998-S10343945912014052000000) ".
3. Start engine and let it idle. For two trip detection logic diagnoses, ECM turns on MIL when it detects the same malfunction twice in the two consecutive driving cycles. For 1st trip detection logic diagnoses, ECM turns on MIL when it detects a malfunction in one driving cycle. ECM blinks MIL when it detects a malfunction that may damage the three way catalyst (misfire).

FUNCTION

DATA MONITOR MODE

Note. The following table includes information (items) inapplicable to this vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items.

Monitored Item

For reference values of the following items, refer to " REFERENCE VALUE ".

Note. Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

WORK SUPPORT MODE

WORK ITEMS DESCRIPTION

Component Function Check

1. PRECONDITIONING Make sure that all of the following conditions are satisfied. TESTING CONDITION Vehicle driven distance: More than 5, 000 km (3, 107 miles) Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm 2 , 14.25 - 15.12 psi) Atmospheric temperature: 20 - 30°C (68 - 86°F) Engine coolant temperature: 75 - 95°C (167 - 203°F) Transmission: Warmed-up After the engine is warmed up to normal operating temperature, drive vehicle until "ATF TEMP 1" (A/T fluid temperature sensor signal) indicates more than 60°C (140°F). Electrical load: Not applied Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight ahead. Engine speed: Idle : GO TO 2.
2. PERFORM SPEC IN DATA MONITOR MODE With CONSULT NOTE: Perform "SPEC" in "DATA MONITOR" mode in maximum scale display. Perform " «BASIC INSPECTION: SPECIAL REPAIR REQUIREMENT»(ref-616999-S17211656672014052000000) ". Select "B/FUEL SCHDL", "A/F ALPHA-B1", "A/F ALPHA-B2", "MAS A/F SE-B1" and "MAS A/F SE-B2" in "SPEC" of "DATA MONITOR" mode with CONSULT. Make sure that monitor items are within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO: Go to " «DIAGNOSIS PROCEDURE»(ref-616999-S01322149262014052000000) ".

Scheme 87

Scheme 88

DETAILED PROCEDURE

1. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2" With CONSULT Start engine. Confirm that the testing conditions are met. Refer to " «COMPONENT FUNCTION CHECK»(ref-616999-S32408398382014052000000) ". Select "A/F ALPHA-B1", "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. NOTE: Check "A/F ALPHA-B1", "A/F ALPHA-B2" for approximately 1 minute because they may fluctuate. It is NG if the indication is out of the SP value even a little. Is the measurement value within the SP value? YES: GO TO 17 . NO-1: Less than the SP value: GO TO 2. NO-2: More than the SP value: GO TO 3 .
2. CHECK "B/FUEL SCHDL" Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value. Is the measurement value within the SP value? YES: GO TO 4 . NO: More than the SP value: GO TO 19 .
3. CHECK "B/FUEL SCHDL" Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value. Is the measurement value within the SP value? YES: GO TO 6 . NO-1: More than the SP value: GO TO 6 . NO-2: Less than the SP value: GO TO 25 .
4. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2" Stop the engine. Disconnect PCV hose, and then plug it. Start engine. Select "A/F ALPHA-B1", "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. Is the measurement value within the SP value? YES: GO TO 5. NO: GO TO 6 .
5. CHANGE ENGINE OIL Stop the engine. Change engine oil. NOTE: This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving conditions (such as when engine oil temperature does not rise enough since a journey distance is too short during winter). The symptom will not be detected after changing engine oil or changing driving conditions. : INSPECTION END
6. CHECK FUEL PRESSURE Check fuel pressure. (Refer to " «INSPECTION»(ref-616998-S13668485852014052000000) ".) Is the inspection result normal? YES: GO TO 9 . NO-1: Fuel pressure is too high: Replace "fuel filter and fuel pump assembly" (Refer to " «REMOVAL AND INSTALLATION»(ref-617018-S03194191762014052000000) ".) and then GO TO 8 . NO-2: Fuel pressure is too low: GO TO 7.
7. DETECT MALFUNCTIONING PART Check fuel hoses and fuel tubes for clogging. Is the inspection result normal? YES: Replace "fuel filter and fuel pump assembly" (Refer to " «REMOVAL AND INSTALLATION»(ref-617018-S03194191762014052000000) ".) and then GO TO 8. NO: Repair or replace and then GO TO 8.
8. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2" Start engine. Select "A/F ALPHA-B1", "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO: GO TO 9.
9. PERFORM POWER BALANCE TEST Perform "POWER BALANCE" in "ACTIVE TEST" mode. Make sure that the each cylinder produces a momentary engine speed drop. Is the inspection result normal? YES: GO TO 12 . NO: GO TO 10.
10. DETECT MALFUNCTIONING PART Check the following bellow. Ignition coil and its circuit (Refer to " «COMPONENT FUNCTION CHECK»(ref-616998-S05667830562014052000000) ".) Fuel injector and its circuit (Refer to " «COMPONENT FUNCTION CHECK»(ref-616998-S03206949262014052000000) ".) Intake air leakage Low compression pressure (Refer to " «INSPECTION»(ref-616997-S19253420152014052000000) ".) Is the inspection result normal? YES: Replace fuel injector (Refer to " «REMOVAL AND INSTALLATION»(ref-616997-S41174751902014052000000) ".) and then GO TO 11. NO: Repair or replace malfunctioning part and then GO TO 11.
11. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2" Start engine. Select "A/F ALPHA-B1", "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO: GO TO 12.
12. CHECK A/F SENSOR 1 FUNCTION Perform all DTC CONFIRMATION PROCEDURE related with A/F sensor 1. For DTC P0130, P0150, refer to " «DTC LOGIC»(ref-616998-S03441264512014052000000) ". For DTC P0131, P0151, refer to " «DTC LOGIC»(ref-616998-S06235865792014052000000) ". For DTC P0132, P0152, refer to " «DTC LOGIC»(ref-616998-S03161411742014052000000) ". For DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, refer to " «DTC LOGIC»(ref-616998-S40021216992014052000000) ". For DTC P2096, P2097, P2098, P2099, refer to " «DTC LOGIC»(ref-616998-S39640264012014052000000) ". Are any DTCs detected? YES: GO TO 13. NO: GO TO 15 .
13. CHECK A/F SENSOR 1 CIRCUIT Perform Diagnosis Procedure according to corresponding DTC. : GO TO 14.
14. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2" Start engine. Select "A/F ALPHA-B1", "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO: GO TO 15.
15. DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR Stop the engine. Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it. : GO TO 16.
16. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2" Start engine. Select "A/F ALPHA-B1", "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO: Detect malfunctioning part according to " «SYMPTOM TABLE»(ref-616998-S05725403192014052000000) ".
17. CHECK "B/FUEL SCHDL" Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO-1: More than the SP value: GO TO 18. NO-2: Less than the SP value: GO TO 25 .
18. DETECT MALFUNCTIONING PART Check for the cause of large engine friction. Refer to the following. Engine oil level is too high Engine oil viscosity Belt tension of power steering, alternator, A/C compressor, etc. is excessive Noise from engine Noise from transmission, etc. Check for the cause of insufficient combustion. Refer to the following. Valve clearance malfunction Intake valve timing control function malfunction Camshaft sprocket installation malfunction, etc. : Repair or replace malfunctioning part, and then GO TO 30 .
19. CHECK INTAKE SYSTEM Check for the cause of uneven air flow through mass air flow sensor. Refer to the following. Crushed air ducts Malfunctioning seal of air cleaner element Uneven dirt of air cleaner element Improper specification of intake air system Is the inspection result normal? YES: GO TO 21 . NO: Repair or replace malfunctioning part, and then GO TO 20.
20. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2", AND "B/FUEL SCHDL" Select "A/F ALPHA-B1", "A/F ALPHA-B2", and "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO: "B/FUEL SCHDL" is more, "A/F ALPHA-B1", "A/F ALPHA-B2" are less than the SP value: GO TO 21.
21. DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR Stop the engine. Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and then reconnect it again. : GO TO 22.
22. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2" Start engine. Select "A/F ALPHA-B1", "A/F ALPHA-B2" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. Is the measurement value within the SP value? YES: Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to " «DIAGNOSIS PROCEDURE»(ref-616998-S02755092282014052000000) ". Then GO TO 29 . NO: GO TO 23.
23. CHECK "MAS A/F SE-B1", "MAS A/F SE-B2" Select "MAS A/F SE-B1", "MAS A/F SE-B2" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value. Is the measurement value within the SP value? YES: GO TO 24. NO: More than the SP value: Replace malfunctioning mass air flow sensor (Refer to " «EXPLODED VIEW»(ref-616997-S13431531762014052000000) ".), and then GO TO 29 .
24. REPLACE ECM Replace ECM. Refer to " «COMPONENT PARTS LOCATION»(ref-616999-S16053064742014052000000) ". Go to " «ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM): SPECIAL REPAIR REQUIREMENT»(ref-616999-S26647245282014052000000) ". : GO TO 29 .
25. CHECK INTAKE SYSTEM Check for the cause of uneven air flow through mass air flow sensor. Refer to the following. Crushed air ducts Malfunctioning seal in air cleaner element Uneven dirt in air cleaner element Improper specification in intake air system Is the inspection result normal? YES: GO TO 27 . NO: Repair or replace malfunctioning part, and then GO TO 26.
26. CHECK "B/FUEL SCHDL" Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that the indication is within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO: Less than the SP value: GO TO 27.
27. CHECK "MAS A/F SE-B1", "MAS A/F SE-B2" Select "MAS A/F SE-B1", "MAS A/F SE-B2" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. Is the measurement value within the SP value? YES: GO TO 28. NO: Less than the SP value: Replace malfunctioning mass air flow sensor (Refer to " «EXPLODED VIEW»(ref-616997-S13431531762014052000000) ".), and then GO TO 30 .
28. CHECK INTAKE SYSTEM Check for the cause of air leak after the mass air flow sensor. Refer to the following. Disconnection, looseness, and cracks in air duct Looseness of oil filler cap Disconnection of oil level gauge Open stuck, breakage, hose disconnection, or cracks in PCV valve Disconnection or cracks in EVAP purge hose, stuck open EVAP canister purge volume control solenoid valve Malfunctioning seal in rocker cover gasket Disconnection, looseness, or cracks in hoses, such as a vacuum hose, connecting to intake air system parts Malfunctioning seal in intake air system, etc. : GO TO 30 .
29. CHECK "A/F ALPHA-B1", "A/F ALPHA-B2", AND "B/FUEL SCHDL" Select "A/F ALPHA-B1", "A/F ALPHA-B2", and "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and make sure that each indication is within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO: Detect malfunctioning part according to " «SYMPTOM TABLE»(ref-616998-S05725403192014052000000) ".
30. CHECK "B/FUEL SCHDL" Select "B/FUEL SCHDL" in "SPEC" of "DATA MONITOR" mode, and then make sure that the indication is within the SP value. Is the measurement value within the SP value? YES: INSPECTION END NO: Detect malfunctioning part according to " «SYMPTOM TABLE»(ref-616998-S05725403192014052000000) ".