DIAGNOSIS AND REPAIR WORKFLOW
Trouble Diagnosis Flow Chart

Trouble Diagnosis Procedure
INTERVIEW WITH CUSTOMER
Interview with the customer is important to detect the root cause of CAN communication system errors and to understand vehicle condition and symptoms for proper trouble diagnosis.
Points in interview
NOTE:
INSPECTION OF VEHICLE CONDITION
Check whether the symptom is reproduced or not.
NOTE: Do not turn the ignition switch OFF or disconnect the battery cable while reproducing the error. The error may temporarily correct itself, making it difficult to determine the root cause.
CHECK OF CAN SYSTEM TYPE (HOW TO USE CAN SYSTEM TYPE SPECIFICATION CHART)
Determine CAN system type based on vehicle equipment.
NOTE:
CAN System Type Specification Chart (Style A)
NOTE: CAN system type is easily checked with the vehicle equipment identification information shown in the chart.

CAN System Type Specification Chart (Style B)
NOTE: CAN system type is easily checked with the vehicle equipment identification information shown in the chart.

CREATE INTERVIEW SHEET
Fill out the symptom described by the customer, vehicle condition, and CAN system type on the interview sheet.
Interview Sheet (Example)

DETECT THE ROOT CAUSE
CAN diagnosis function of CONSULT detects the root cause.
System description
CANP0197, P0198 EOT sensor
DTC Description
DTC DETECTION LOGIC
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P0197
EOT SEN/CIRC
(Engine oil temperature sensor low)
An excessively low voltage from the engine oil temperature sensor is
sent
to ECM.
...
Additional service when replacing TCM
Description
Always perform the following items when the TCM is replaced.
TCM PROGRAMMING
Since vehicle specifications are not yet written in a new TCM, it
is necessary to write them with CONSULT.
CAUTION:
When replacing TCM, save TCM data on CONSULT before removing TCM.
SAVING ...
Headlight control switch
Type A (if so equipped)
When turning the switch to the
position,
the front parking, tail, license plate and
instrument panel lights come on.
When turning the switch to the
position,
the headlights come on and all the other
lights remain on.
Type B (if so equipped)
...