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DTC
Self-diagnosis item
(CONSULT-III indication) DTC detection condition Inspection/Action
U0101 LOST COMM (TCM) When ECM is not transmitting or receiving CAN
communication signal of OBD (emission-related
diagnosis) from TCM for 2 seconds or more.
Start the inspection. Re-
fer to the applicable sec-
tion of the indicated
control unit.
U0140 LOST COMM (BCM)
When ECM is not transmitting or receiving CAN
communication signal of OBD (emission-related
diagnosis) from BCM for 2 seconds or more.
U1000 CAN COMM CIRCUIT When a control unit (except for ECM) is not
transmitting or receiving CAN communication
signal for 2 seconds or more.
U1001 CAN COMM CIRCUIT When ECM is not transmitting or receiving CAN
communication signal for 2 seconds or more.
U1002 SYSTEM COMM When a control unit is not transmitting or receiv-
ing CAN communication signal for 2 seconds or
less.
U1010 CONTROL UNIT(CAN) When an error is detected during the initial diag-
nosis for CAN controller of each control unit. Replace the control unit
indicating “U1010” or
“P0607”.
P0607 ECM
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Example: CAN DIAG SUPPORT MNTR indication
Without PAST
With PAST
MONITOR ITEM (ON-BOARD DIAGNOSIS) NOTE:
For some models, CAN communication diagnosis result is received from the vehicle monitor. Item PRSNT PAST Description
Transmission diagnosis OKOK Normal at present and in the past
1 – 39 Normal at present, but unable to transmit signals for 2 seconds or more
in the past. (The number indicates the number of ignition switch cycles
from OFF to ON.)
UNKWN 0 Unable to transmit signals for 2 seconds or more at present.
Control unit name
(Reception diagnosis) OK
OK Normal at present and in the past
1 – 39 Normal at present, but unable to receive signals for 2 seconds or more
in the past. (The number indicates the number of ignition switch cycles
from OFF to ON.)
UNKWN 0 Unable to receive signals for 2 seconds or more at present.
– – Diagnosis not performed.
No control unit for receiving signals. (No applicable optional parts)
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Trouble Diagnosis Flow Chart INFOID:0000000004306694
Trouble Diagnosis Procedure INFOID:0000000004306695
INTERVIEW WITH CUSTOMER Interview with the customer is important to detect t he root cause of CAN communication system errors and to
understand vehicle condition and symptoms for proper trouble diagnosis.
Points in interview
• What: Parts name, system name
• When: Date, Frequency
• Where: Road condition, Place
• In what condition: Driving condition/environment
• Result: Symptom
NOTE:
• Check normal units as well as error symptoms.
- Example: Circuit between ECM and the combination meter is judged normal if the customer indicates tachometer functions normally.
• When a CAN communication system error is present, mult iple control units may malfunction or go into fail-
safe mode.
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CAN system type is easily checked wi
th the vehicle equipment identification information shown in the chart.
CAN System Type Specification Chart (Style B) NOTE:
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Interview Sheet (Example)
DETECT THE ROOT CAUSE CAN diagnosis function of CONSUL T-III detects the root cause.