Work Flow
OVERALL SEQUENCE
DETAILED FLOW
1.GET INFORMATION FOR SYMPTOM
Malfunction information, obtained>>GO TO 2.
No malfunction information, but a request for I/M examination>>GO TO 13.
2.CHECK DTC
(Symptom Matrix Chart is useful. Refer to EC-486, "Symptom Table".)
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 EC-492, "Description" and EC- 89, "Fail Safe".
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 Refer to EC-492, "Description" and EC-89, "Fail Safe".
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 EC-92, "DTC Inspection Priority Chart" and determine trouble diagnosis order.
NOTE:
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 GI-41, "Intermittent Incident".
6.PERFORM BASIC INSPECTION
Perform EC-132, "Work Procedure".
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 EC-157, "Component Function Check".
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 EC-158, "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 EC-486, "Symptom Table" 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 GI-44, "Circuit Inspection". 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 EC-77, "Reference Value".
11.REPAIR OR REPLACE THE MALFUNCTIONING PART
>> GO TO 12.
12.FINAL CHECK
When DTC was detected in step 2, perform DTC CONFIRMATION PROCEDURE or Component Function Check again, and then check that the malfunction have been completely repaired.
When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and check 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. If the completion of SRT is needed, drive vehicle under the specific driving pattern. Refer to EC-146, "SRT Set Driving Pattern".
NO-2 >> I/M examination, requested from the customer: GO TO 13.
13.PREPARE FOR I/M EXAMINATION
>> INSPECTION END
Diagnostic Work Sheet
DESCRIPTION
There are many operating conditions that lead to the malfunction of engine components. A good grasp of such conditions can make troubleshooting faster and more accurate.
In general, each customer feels differently about symptoms. It is important to fully understand the symptoms or conditions for a customer 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:
WORKSHEET SAMPLE
Tire chains
Use of tire chains may be prohibited according to
location. Check the local laws before installing
tire chains. When installing tire chains, make sure
they are the proper size for the tires on your
vehicle and are installed according to the chain
manufacturer’s suggestions. Use only SAE
clas ...
ABS actuator and electric unit (control unit)
Exploded View
ABS actuator and electric unit (control unit)
Connector
Bracket
To front LH brake caliper
To rear RH brake caliper
From master cylinder secondary side
From master cylinder primary side
To rear LH brake caliper
To front RH brake ...
The meter control switch is inoperative
Description
The meter control switches are inoperative when pressed.
Diagnosis Procedure
1.CHECK METER CONTROL SWITCH SIGNAL
Check the meter control switch signal. Refer to MWI-67, "Diagnosis
Procedure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair ...