Work Flow
NOTE: “DTC” includes DTC at the 1st trip.
1.OBTAIN INFORMATION ABOUT SYMPTOM
Refer to TM-80, "Diagnostic Work Sheet" and interview the customer to obtain the malfunction information (conditions and environment when the malfunction occurred) as much as possible when the customer brings in the vehicle.
>> GO TO 2.
2.CHECK DTC
Do malfunction information and DTC exists? Malfunction information and DTC exists.>>GO TO 3.
Malfunction information exists but no DTC.>>GO TO 4.
No malfunction information, but DTC exists.>>GO TO 5.
3.REPRODUCE MALFUCTION SYSTEM
Check the malfunction described by the customer on the vehicle.
Check if the behavior is fail safe or normal operation. Refer to TM-58, "Fail-safe".
Interview sheet can be used effectively when reproduce malfunction conditions. Refer to TM-80, "Diagnostic Work Sheet".
Verify the relationship between the symptom and the conditions in which the malfunction described by the customer occurs.
>> GO TO 5.
4.REPRODUCE MALFUNCTION SYMPTOM
Check the malfunction described by the customer on the vehicle.
Check if the behavior is fail safe or normal operation. Refer to TM-58, "Fail-safe".
Interview sheet can be used effectively when reproduce malfunction conditions. Refer to TM-80, "Diagnostic Work Sheet".
Verify the relationship between the symptom and the conditions in which the malfunction described by the customer occurs.
>> GO TO 6.
5.PERFORM “DTC CONFIRMATION PROCEDURE”
Perform “DTC CONFIRMATION PROCEDURE” of the appropriate DTC to check if DTC is detected again.
Refer to TM-62, "DTC Inspection Priority Chart" when multiple DTCs are detected, and then determine the order for performing the diagnosis.
Is any DTC detected? YES >> GO TO 7.
NO >> Follow GI-41, "Intermittent Incident" to check.
6.IDENTIFY MALFUNCTIONING SYSTEM WITH “DIAGNOSIS CHART BY SYMPTOM”
Use TM-186, "Symptom Table" from the symptom inspection result in step 4. Then identify where to start performing the diagnosis based on possible causes and symptoms.
>> GO TO 8.
7.REPAIR OR REPLACE THE MALFUNCTIONING PARTS
Repair or replace the detected malfunctioning parts.
Reconnect parts or connector after repairing or replacing, and then erase DTC if necessary.
>> GO TO 8.
8.FINAL CHECK
Perform “DTC CONFIRMATION PROCEDURE” again to make sure that the repair is correctly performed.
Check that malfunctions are not reproduced when obtaining the malfunction information from the customer, referring to the symptom inspection result in step 3 or 4.
Is DTC or malfunction symptom reproduced? YES-1 (DTC is reproduced.)>>GO TO 5.
YES-2 (Malfunction is reproduced.)>>GO TO 6.
NO >> Before delivering the vehicle to the customer, make sure that DTC is erased.
Diagnostic Work Sheet
DESCRIPTION
There are many operating conditions that may cause a malfunction of the transmission parts. By understanding those conditions properly, a quick and exact diagnosis can be achieved.
In general, perception of a problem varies depending on individuals.
Ask the customer about his/her concerns carefully. It is important to understand the phenomenon or status. To systemize all the information for the diagnosis, prepare the question sheet referring to the question points.
In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.

Worksheet Sample


Basic inspection
Additional service when replacing TCMThe parking brake release warning continues displaying,
or does not display
Description
The parking brake warning is displayed during vehicle travel even though
the parking brake is released.
The parking brake warning is not displayed even though driving the
vehicle with the parking brake applied.
Diagnosis Procedure
1.CHECK PARKING BRAKE WARNING LAMP ...
Radio
With the ignition placed in the ACC or ON position,
press the or POWER
button/VOLUME control knob to turn the radio
on. If you listen to the radio with the engine not
running, the ignition should be placed in the ACC
position.
Radio reception is affected by station signal
strength, distance ...
C1604 torque sensor
DTC Logic
DTC DETECTION LOGIC
DTC
Display item
Malfunction detected condition
Possible cause
C1604
TORQUE SENSOR
When torque sensor output signal is malfunctioning.
Harness or connector
Torque sensor
EPS control unit
...