Nissan Sentra Service Manual: U1000 CAN Comm circuit
Description
Can (controller area network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In can communication, control units are connected with 2 communication lines (can-h line, can-l line) allowing a high rate of information transmission with less wiring.
Each control unit communicate data but selectively reads required data only.
DTC Logic
Dtc detection logic
| Dtc | Display item | Malfunction detected condition | Possible cause |
| U1000 | Can comm circuit | Eps control unit is not transmitting/receiving can communication signal for 2 seconds or more. |
|
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 off to on.
-
Perform EPS self-diagnosis.
Is DTS U1000 detected? Yes >> proceed to diagnosis procedure. Refer to stc-30, "diagnosis procedure".
No >> inspection end.
Diagnosis Procedure
Proceed to lan-16, "trouble diagnosis flow chart".
C1609 Vehicle speed signal
DTC Logic
Dtc detection logic
DTC
Display item
Malfunction detected condition
Possible cause
C1609
CAN VHCL SPEED
Malfunction is detected in vehicle speed sig ...
EPS Warning lamp
Component Function Check
1.CHECK THE ILLUMINATION OF THE EPS WARNING LAMP
Check that the EPS warning lamp turns ON when ignition switch
turns ON. Then, EPS warning lamp turns
OFF after the engin ...
Other materials:
Power window main switch
Reference Value
TERMINAL LAYOUT
PHYSICAL VALUES
MAIN POWER WINDOW AND DOOR LOCK/UNLOCK SWITCH
Fail Safe
FAIL-SAFE CONTROL
Switches to fail-safe control when malfunction is detected in encoder signal
that detects up/down speed and
direction of door glass. Switches to fail-safe co ...
Precautions for Suspension
When installing rubber bushings, the final tightening must be carried
out under unladen conditions with tires
on ground. Spilled oil might shorten the life of rubber bushings. Be sure to
wipe off any spilled oil
Unladen conditions mean that fuel, engine coolant and lubricant are full. ...
Low tire pressure warning lamp does not turn oFF
Low Tire Pressure Warning Lamp Stays On When Ignition Switch Is Turned On
DIAGNOSTIC PROCEDURE
1.INSPECT BCM CONNECTOR
Turn ignition switch OFF.
Disconnect BCM connectors.
Check terminals for damage or loose connections.
Is the inspection result normal?
YES >> GO TO 2.
NO > ...
