Qashqai J11. Engine control system (MR20DD) — part 8
ECM-114
< WIRING DIAGRAM >
[MR20DD]
ENGINE CONTROL SYSTEM
JRBWC6842GB
ENGINE CONTROL SYSTEM
ECM-115
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[MR20DD]
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JRBWC6843GB
ECM-116
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[MR20DD]
ENGINE CONTROL SYSTEM
JRBWC6844GB
ENGINE CONTROL SYSTEM
ECM-117
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[MR20DD]
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JRBWC6845GB
ECM-118
< WIRING DIAGRAM >
[MR20DD]
ENGINE CONTROL SYSTEM
JRBWC6846GB
ENGINE CONTROL SYSTEM
ECM-119
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[MR20DD]
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JRBWC6847GB
ECM-120
< BASIC INSPECTION >
[MR20DD]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
INFOID:0000000010702855
OVERALL SEQUENCE
*1: Include 1st trip DTC.
*2: Include 1st trip freeze frame data.
JSBIA1812GB
DIAGNOSIS AND REPAIR WORKFLOW
ECM-121
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[MR20DD]
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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
Malfunction information, obtained>>GO TO 2.
2.
CHECK DTC
1.
Check DTC of “ALL DTC Reading”.
2.
Perform the following procedure if DTC is displayed.
-
Record DTC and freeze frame data. (Print them out with CONSULT or GST.)
-
Erase only DTC of “ENGINE”. Refer to the following.
•
With CONSULT: “How to Erase DTC and 1st Trip DTC” in
.
•
Without CONSULT: “How to Erase Self-diagnostic Results” in
ECM-63, "On Board Diagnosis Func-
-
Study the relationship between the cause detected by DTC and the symptom described by the customer.
(Symptom Table is useful. Refer to
3.
Check related service bulletins for information.
Is any symptom described and is any DTC 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 fail-safe related to the symptom. Refer to
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 fail-safe related to the symptom. Refer to
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 check that DTC is detected
again.
If two or more DTCs are detected, refer to
ECM-91, "DTC Inspection Priority Chart"
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
Manual. 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 CONFIR-
MATION PROCEDURE.
Is DTC detected?
YES
>> GO TO 10.
NO
>> Check according to
GI-41, "Intermittent Incident"
.
6.
PERFORM BASIC INSPECTION
ECM-122
< BASIC INSPECTION >
[MR20DD]
DIAGNOSIS AND REPAIR WORKFLOW
Perform
Do you have CONSULT?
YES
>> GO TO 7.
NO
>> GO TO 9.
7.
PERFORM SPEC IN DATA MONITOR MODE
With CONSULT
Check that “MASS AIR FLOW SENSOR (Hz)”, “B/FUEL SCHDL”, and “A/F ALPHA-B1” are within the SP
value using “SPEC” in “DATA MONITOR” mode with CONSULT. Refer to
.
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
ECM-138, "Diagnosis Procedure"
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
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 EC section 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
.
Is a malfunctioning part detected?
YES
>> GO TO 11.
NO
>> Monitor input data from related sensors or check voltage of related ECM terminals using CON-
SULT. Refer to
11.
REPAIR OR REPLACE THE MALFUNCTIONING PART
1.
Repair or replace the malfunctioning part.
2.
Reconnect parts or connectors disconnected during Diagnosis Procedure again after repair and replace-
ment.
3.
Check DTC. If DTC is displayed, erase it.
>> 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 repaired securely.
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
>>
With CONSULT: Before returning the vehicle to the customer, make sure to erase unnecessary
DTC in ECM. (Refer to “How to Erase DTC and 1st Trip DTC” in
.)
NO-2
>>
Without CONSULT: Before returning the vehicle to the customer, make sure to erase unneces-
sary DTC in ECM. (Refer to “How to Erase Self-diagnostic Results” in
.)
DIAGNOSIS AND REPAIR WORKFLOW
ECM-123
< BASIC INSPECTION >
[MR20DD]
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Diagnostic Work Sheet
INFOID:0000000010702856
DESCRIPTION
There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about symptoms. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the WORKSHEET SAMPLE
below in order to organize all the information for troubleshooting.
Some conditions may cause the MIL to illuminate or blink, and DTC
to be detected. Examples:
• Vehicle ran out of fuel, which caused the engine to misfire.
• Fuel filler cap was left off or incorrectly screwed on, allowing fuel to
evaporate into the atmosphere.
WORKSHEET SAMPLE
SEF907L
MTBL0017
ECM-124
< BASIC INSPECTION >
[MR20DD]
ADDITIONAL SERVICE WHEN REPLACING ECM
ADDITIONAL SERVICE WHEN REPLACING ECM
Description
INFOID:0000000010702857
When replacing ECM, the following procedure must be performed. (For details, refer to
PROGRAMMING OPERATION
NOTE:
After replacing with a blank ECM, programming is required to write ECM information. Be sure to follow the pro-
cedure to perform the programming.
Work Procedure
INFOID:0000000010702858
1.
SAVE ECM DATA
With CONSULT
1.
Turn ignition switch OFF.
2.
Reconnect all harness connectors disconnected.
3.
Turn ignition switch ON.
4.
Select “SAVING DATA FOR REPLC CPU” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.
5.
Follow the instruction of CONSULT display.
NOTE:
• Necessary data in ECM is copied and saved to CONSULT.
• Go to Step 2 regardless of with or without success in saving data.
>> GO TO 2.
2.
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 -
×××××
.
• Check part number when ordering ECM or the one included in the label on the container box.
Is the ECM a blank ECM?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
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 Manual.
NOTE:
• The ECM part number is saved in CONSULT.
• Even when ECM part number is not saved in CONSULT, go to 4.
>> GO TO 4.
4.
PERFORM ECM PROGRAMMING
After replacing ECM, perform the ECM programming. Refer to CONSULT Operation Manual.
NOTE:
• Refer to
ECM-416, "Removal and Installation"
for replacement of ECM.
• 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 6.
5.
REPLACE ECM
ADDITIONAL SERVICE WHEN REPLACING ECM
ECM-125
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[MR20DD]
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ECM-416, "Removal and Installation"
>> GO TO 6.
6.
PERFORM INITIALIZATION OF IVIS (NATS) SYSTEM AND REGISTRATION OF ALL IVIS (NATS) IGNI-
TION KEY IDS
.
>> GO TO 7.
7.
CHECK ECM DATA STATUS
Check if the data is successfully copied from the ECM at Step 1 (before replacement) and saved in CONSULT.
Is the data saved successfully?
YES
>> GO TO 8.
NO
>> GO TO 9.
8.
WRITE ECM DATA
With CONSULT
1.
Select “WRITING DATA FOR REPLC CPU” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.
2.
Follow the instruction of CONSULT display.
NOTE:
The data saved by “SAVING DATA FOR REPLC CPU” is written to ECM.
>> GO TO 10.
9.
PERFORM VIN REGISTRATION
>> GO TO 10.
10.
PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING
Perform accelerator pedal released position learning. Refer to
.
>> GO TO 11.
11.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
Perform throttle valve closed position learning. Refer to
.
>> GO TO 12.
12.
PERFORM IDLE AIR VOLUME LEARNING
Perform idle air volume learning. Refer to
.
>> END
ECM-126
< BASIC INSPECTION >
[MR20DD]
VIN REGISTRATION
VIN REGISTRATION
Description
INFOID:0000000010702859
VIN Registration is an operation to registering VIN in ECM. It must be performed each time ECM is replaced.
Work Procedure
INFOID:0000000010702860
1.
CHECK VIN
Check the VIN of the vehicle and note it. Refer to
GI-24, "Information About Identification or Model Code"
>> GO TO 2.
2.
PERFORM VIN REGISTRATION
With CONSULT
1.
Turn ignition switch ON and engine stopped.
2.
Select “VIN REGISTRATION” in “WORK SUPPORT” mode of “ENGINE”.
3.
Follow the instruction of CONSULT display.
>> END
ACCELERATOR PEDAL RELEASED POSITION LEARNING
ECM-127
< BASIC INSPECTION >
[MR20DD]
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ACCELERATOR PEDAL RELEASED POSITION LEARNING
Description
INFOID:0000000010702861
Accelerator Pedal Released Position Learning is a function of ECM to learn the fully released position of the
accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each
time harness connector of accelerator pedal position sensor or ECM is disconnected.
Work Procedure
INFOID:0000000010702862
1.
START
1.
Make sure that accelerator pedal is fully released.
2.
Turn ignition switch ON and wait at least 2 seconds.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Repeat steps 2 to 3 for three times.
>> END
ECM-128
< BASIC INSPECTION >
[MR20DD]
THROTTLE VALVE CLOSED POSITION LEARNING
THROTTLE VALVE CLOSED POSITION LEARNING
Description
INFOID:0000000010702863
Throttle Valve Closed Position Learning is a function of ECM to learn the fully closed position of the throttle
valve by monitoring the throttle position sensor output signal. It must be performed each time the harness con-
nector of the electric throttle control actuator or ECM is disconnected or electric throttle control actuator inside
is cleaned.
Work Procedure
INFOID:0000000010702864
1.
START
1.
Make sure that accelerator pedal is fully released.
2.
Turn ignition switch ON.
3.
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
IDLE AIR VOLUME LEARNING
ECM-129
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[MR20DD]
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IDLE AIR VOLUME LEARNING
Description
INFOID:0000000010702865
Idle Air Volume Learning is a function of ECM to learn the idle air volume that keeps engine idle speed within
the specific range. It must be performed under the following conditions:
• Each time electric throttle control actuator or ECM is replaced.
• Idle speed or ignition timing is out of specification.
Work Procedure
INFOID:0000000010702866
1.
PRECONDITIONING
Check that all of the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are missed for even a moment.
• Battery voltage: More than 12.9 V (At idle)
• Engine coolant temperature: 70 – 100
°
C (158 – 212
°
F)
• Selector lever: P or N (CVT), Neutral (M/T)
• Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
• Steering wheel: Neutral (Straight-ahead position) position
• Vehicle speed: Stopped
• Transmission: Warmed-up (Drive vehicle for 10 minutes.)
Do you have CONSULT?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
IDLE AIR VOLUME LEARNING
With CONSULT
1.
Perform “ACCELERATOR PEDAL RELEASED POSITION LEARNING”. Refer to
2.
Perform “THROTTLE VALVE CLOSED POSITION LEARNING”. Refer to
.
3.
Start engine and warm it up to normal operating temperature.
4.
Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.
5.
Touch “START” and wait 20 seconds.
Is “CMPLT” displayed on CONSULT screen?
YES
>> GO TO 4.
NO
>> GO TO 5.
3.
IDLE AIR VOLUME LEARNING
Without CONSULT
NOTE:
• It is better to count the time accurately with a clock.
• It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has a mal-
function.
1.
Perform “ACCELERATOR PEDAL RELEASED POSITION LEARNING”. Refer to
2.
Perform “THROTTLE VALVE CLOSED POSITION LEARNING”. Refer to
.
3.
Start engine and warm it up to normal operating temperature.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
6.
Repeat the following procedure quickly five times within 5 seconds.
-
Fully depress the accelerator pedal.
-
Fully release the accelerator pedal.
7.
Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops
blinking and turned ON.
8.
Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
9.
Start engine and let it idle.
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