Nissan Frontier. Instruction — part 970
LAN-30
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
c.
Reception item of “TRANSMISSION”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means TCM
could not receive the signal from ABS in the past. Draw a line between TCM and ABS (line 2-c in the fig-
ure below).
3. CAN DIAG SUPPORT MNTR (without PAST): Check the CAN DIAG SUPPORT MNTR (without PAST) of
units indicating “U1000” or “U1001” on SELF-DIAG RESULTS. Draw a line on the diagnosis sheet to indi-
cate the possible error circuit.
NOTE:
• While an error occurred in the past according to SELF-DIAG RESULTS, it is unclear which signal is not
received. Assume that errors were detected from all reception items.
• Draw a single line among the unit and all reception items. (Work flow differs from CAN DIAG SUPPORT
MNTR (with PAST).)
a. Reception item of “EPS”: Assume that the unit could not receive the signals from ECM, ABS, and M&A.
Draw a line among EPS, ECM, ABS, and M&A (line 3-a in the figure below).
JSMIA0820GB
LAN
DIAGNOSIS AND REPAIR WORKFLOW
LAN-31
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
b. Reception item of “ABS”: Assume that the unit could not receive the signal from ECM. Draw a line
between ABS and ECM (line 3-b in the figure below).
4. Search for the possible cause using CAN communication signal chart using information from the interview
with the customer.
NOTE:
For the details of CAN communication signal, refer to
LAN-54, "CAN Communication Signal Chart"
a. ABS warning lamp turned ON and speedometer did not move: This means that “ABS warning lamp signal”
and “Vehicle speed signal” could not communicate between M&A and ABS (4-a in the figure below).
JSMIA0821GB
LAN-32
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
b. The tachometer moved normally: This means that “Engine speed signal” could communicate normally
between ECM and M&A (4-b in the figure below).
5. Fill out the diagnosis sheet based on information from step 4.
a. The ABS warning lamp turned ON and speedometer did not move: Assume that a possible cause is no
communication between M&A and ABS. Draw a line between M&A and ABS. (Line 5-a in the figure
below).
SKIB8895E
LAN
DIAGNOSIS AND REPAIR WORKFLOW
LAN-33
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
b. The tachometer moved normally: Put check marks between ECM and M&A. The circuit between ECM and
M&A is functioning properly (check marks 5-b in the figure below).
6. The circuit which has the most amount of lines are the possible cause. Error is detected from ABS actua-
tor and electric unit (control unit) branch line (shaded in the figure below).
NOTE:
For abbreviations, refer to
.
SKIB8735E
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