Nissan Sentra Service Manual: U1002 System comm (CAN)
DTC Logic
DTC DETECTION LOGIC
| DTC | Display item | Malfunction detected condition | Possible cause |
| U1002 | SYSTEM COMM(CAN) | When ABS actuator and electric unit (control unit) is not transmitting or receiving CAN communication signal for 2 seconds or less. |
|
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.DTC REPRODUCTION PROCEDURE
With CONSULT
-
Turn the ignition switch ON.
-
Perform self diagnosis for “ABS”.
Is DTC “U1002” detected? YES >> Proceed to BRC-88, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis Procedure
CAUTION:
-
Never apply 7.0 V or more to the measurement terminal.
-
Use a tester with open terminal voltage of 7.0 V or less.
-
Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when checking the harness.
1.CHECK CAN DIAGNOSIS SUPPORT MONITOR
-
Select “ABS” and “CAN Diagnosis Support Monitor” in order with CONSULT.
-
Check malfunction history between each control unit connected to ABS actuator and electric unit (control unit).
Check the result of “PAST”? All items are “OK”>>Refer to GI-39, "Intermittent Incident".
“TRANSMIT DIAG” is other than “OK”>>GO TO 2.
A control unit other than ABS actuator and electric unit (control unit) is anything other than “OK”>>GO TO 3.
2.CHECK TRANSMITTING SIDE UNIT
Check the ABS actuator and electric unit (control unit) harness connector terminals 14 and 26 for damage or loose connection.
Is the inspection result normal? YES >> Erase self-diagnosis results. Then perform self-diagnosis for “ABS” with CONSULT.
NO >> Recheck terminals for damage or loose connection.
3.CHECK APPLICABLE CONTROL UNIT
Check damage or loose connection of each CAN communication line harness connector terminals.
Is the inspection result normal? YES >> Erase self-diagnosis results. Then perform self-diagnosis for applicable control unit with CONSULT.
NO >> Recheck terminals for damage or loose connection.
U1000 CAN Comm circuit
DTC Logic
DTC DETECTION LOGIC
DTC
Display Item
Malfunction detected condition
Possible causes
U1000
CAN COMM CIRCUIT
When CAN communication signal is not continuously
...
U1010 Control unit (CAN)
Description
Initial diagnosis of ABS actuator and electric unit (control
unit)
DTC Logic
DTC DETECTION LOGIC
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible ...
Other materials:
Symptom diagnosis
Combination switch system symptoms
Symptom Table
Perform the data monitor of consult to check for any malfunctioning
item.
Check the malfunction combinations.
Identify the malfunctioning part from the agreed combination and repair
or replace the part.
...
Precaution for work
When removing or disassembling each component, be careful not to damage
or deform it. If a component
may be subject to interference, be sure to protect it with a shop cloth.
When removing (disengaging) components with a screwdriver or similar
tool, be sure to wrap the component
with a ...
Diagnosis system (TCM)
DIAGNOSIS DESCRIPTION
DIAGNOSIS DESCRIPTION : 1 Trip Detection Diagnosis and 2 Trip Detection
Diagnosis
NOTE:
“Start the engine and turn OFF the ignition switch after warm-up.” This is
defined as 1 trip.
TRIP DETECTION DIAGNOSIS
When initial malfunction is detected, TCM mem ...
