DTC U0402:00 [RADAR UNIT]
id1502a6019300
|
Description |
Error signal received from TCM |
|---|---|
|
Detection condition
|
• Communication error between TCM and radar unit
|
|
Fail-safe
|
• Inhibits the Mazda radar cruise control (MRCC) system control
|
|
Possible cause
|
• DTCs are stored in the TCM.
• TCM malfunction (selector lever position signal malfunction)
• Radar unit malfunction
|
|
System wiring diagram
|
Not applicable
|
Diagnostic Procedure
|
Step |
Inspection |
Action |
|
|---|---|---|---|
|
1
|
VERIFY TCM DTCs
• Retrieve the TCM DTCs using the M-MDS.
• Are any other DTCs displayed?
|
Yes
|
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
|
|
No
|
Go to the next step.
|
||
|
2
|
VERIFY IF MALFUNCTIONING LOCATION IS TCM DEPENDING ON REPEATABILITY
• Clear the DTC for the radar unit using the M-MDS.
(See CLEARING DTC [RADAR UNIT].)
• Retrieve the radar unit DTCs using the M-MDS.
(See DTC INSPECTION [RADAR UNIT].)
• Is the same DTC displayed?
|
Yes
|
Replace the TCM, then go to the next step.
|
|
No
|
Go to the next step.
|
||
|
3
|
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
• Clear the DTC for the radar unit using the M-MDS.
(See CLEARING DTC [RADAR UNIT].)
• Retrieve the radar unit DTCs using the M-MDS.
(See DTC INSPECTION [RADAR UNIT].)
• Is the same DTC displayed?
|
Yes
|
Replace the radar unit, then go to the next step.
|
|
No
|
Go to the next step.
|
||
|
4
|
VERIFY IF OTHER DTCs DISPLAYED
• Are any other DTCs displayed?
|
Yes
|
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [RADAR UNIT].)
|
|
No
|
DTC troubleshooting completed.
|
||