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
System
EPS SYSTEM
EPS SYSTEM : System Description
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
Communicates the signal from each control unit via CAN communication.
Control unit
Signal status
ECM
Transmits the following signal to EPS control unit via CAN
communica ...
Engine compartment check locations
Engine compartment check locations
QR25DE engine
Engine coolant reservoir
Engine oil filler cap
Brake fluid reservoir
Battery
Air cleaner
Fuse/Fusible link box
Radiator cap
Engine oil dipstick
Drive belt location
...
Removal and installation
HORN
Exploded View
Horn (LOW)
Horn (HIGH)
Removal and Installation
REMOVAL
Horn (LOW)
Remove the front grille. Refer to EXT-23, "Removal and
Installation".
Disconnect the harness connectors from the horn (LOW).
NOTE:
Before disconnecting the harn ...