Nissan Sentra B18 (2020-2025) Service Manual: U2140-87 Can Comm Err (ecm)
Dtc Description
DTC Description
DESCRIPTION
CAN (Controller Area Network) is a serial communication system for real time application. It is an on-Nissan Sentra vehicle multiplex communication system with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto Nissan Sentra vehicles, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with two communication lines (CAN-High line, CAN-Low line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to How To Use CAN Communication Signal Chart.
DTC DETECTION LOGIC
|
DTC No. |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
|
|---|---|---|---|
|
U2140-87 |
CAN comm err (ECM) [CAN communication error (ECM)] |
Diagnosis condition |
Ignition switch ON |
|
Signal (Terminal) |
CAN communication signal |
||
|
Threshold |
A/C amp. is not transmitting or receiving CAN communication signal |
||
|
Diagnosis delay time |
2 seconds or more |
||
POSSIBLE CAUSE
CAN communication system
FAIL-SAFE
—
Confirmation Procedure
Confirmation Procedure
-
PERFORM SELF DIAGNOSTIC RESULT
-
CONSULT-
Ignition switch ON.
-
Select “Self Diagnostic Result” mode of “HVAC”.
-
Check DTC.
-
Is DTC detected?
YES >>Refer to DTC Diagnosis Procedure.
NO >>To check malfunction symptom before repair: Refer to Intermittent Incident.
NO >>Confirmation after repair: Inspection End.
-
Dtc Diagnosis Procedure
DTC Diagnosis Procedure
-
CHECK CAN COMMUNICATION SYSTEM
-
Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.
Inspection End.
-
Other materials:
B1360 Combination Meter
Dtc Description
DTC Description
DTC DETECTION LOGIC
DTC No.
CONSULT screen terms
(Trouble diagnosis
content)
DTC detection condition
...
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Location
A.
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B.
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Dtc Description
DTC Description
Note:
The Signal Tech II Tool [– (NI-50190)] can be used
to perform the following functions: Refer to the Signal Tech II User
Guide for additional information.
Activate and display TPMS sensor IDs
Display tire pressure rep ...