Nissan Altima HL32 Hybrid. Manual — part 775
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LAN-54
< BASIC INSPECTION >
[HEV SYSTEM CAN]
DIAGNOSIS AND REPAIR WORKFLOW
For abbreviations, refer to
DETECT THE ROOT CAUSE
Description
To detect the root cause of HEV SYSTEM CAN, check for short circuit first. When there is no short circuit,
check for open circuit.
Short Circuit
Check for short circuit, and DLC branch line open circuit.
When the symptoms listed below exist, a short circuit of the HEV SYSTEM CAN communication line or control
unit is a possible cause.
Received data
• *1: Hybrid vehicle control ECU may display one or more DTCs (INF code) listed as follows; U0100 (211), U0100 (212), U0100 (530).
• *2: Hybrid vehicle control ECU may display one or more DTCs (INF code) listed as follows; U0129 (220), U0129 (222), U0129 (528).
• *3: Hybrid vehicle control ECU may display one or more DTCs (INF code) listed as follows; U0131 (433), U0131 (434).
Error symptom
• Most the units connected to the HEV SYSTEM CAN go into fail-safe mode or are deactivated.
Inspection procedure
JPMIA0253GB
Item (CONSULT-III)
Indication
The printed or saved All DTC Reading
• The items of EPS and ABS are not displayed.
• U0129, U0293, U1020 and U1022 are displayed as the ENGINE items.
• U0100
*1
, U0129
*2
and U0131
*3
are displayed as the HYBRID SYSTEM items.
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LAN
DIAGNOSIS AND REPAIR WORKFLOW
LAN-55
< BASIC INSPECTION >
[HEV SYSTEM CAN]
C
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B
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• Refer to
NOTE:
DLC branch line circuit can be open when the following conditions are satisfied as All DTC Reading result;
• The DTCs related to HEV SYSTEM CAN are not displayed as ENGINE or HYBRID SYSTEM item.
• The items of EPS and ABS are not displayed.
For the DLC branch line circuit inspection procedure, refer to
.
Open Circuit
Draw a line on the diagnosis sheet to indicate the possible cause. Narrow the search.
NOTE:
• Color-code when drawing lines.
• Do not draw a line onto a existing line.
• When the root cause appears to be a branch line, be sure to check the control unit as well as the communi-
cation line.
1. Check each item on the printed or saved All DTC Reading. Draw a line on the diagnosis sheet to indicate
the error circuit. Refer to
LAN-59, "DTC Related to HEV SYSTEM CAN List"
a. Reception item of “HYBRID SYSTEM”:
i.
“U0100:LOST COMM [ECM]:211”, “U0100:LOST COMM [ECM]:212” and “U0100:LOST COMM
[ECM]:530” are indicated. This means HV ECU cannot receive the signal from ECM. Draw a line to indi-
cate an error between HV ECU and ECM (line 1-a-i in the figure below).
JPMIA0260GB
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LAN-56
< BASIC INSPECTION >
[HEV SYSTEM CAN]
DIAGNOSIS AND REPAIR WORKFLOW
ii.
“U0131:LOST COMM [EPS]:433” and “U0131:LOST COMM [EPS]:434” are indicated. This means HV
ECU cannot receive the signal from EPS. Draw a line to indicate an error between HV ECU and EPS (line
1-a-ii in the figure below).
b. Reception item of “ENGINE”:
i.
“U0293” and “U1020” are indicated. This means ECM cannot receive the signal from HV ECU. Draw a line
to indicate an error between ECM and HV ECU (line 1-b-i in the figure below).
JPMIA0254GB
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LAN
DIAGNOSIS AND REPAIR WORKFLOW
LAN-57
< BASIC INSPECTION >
[HEV SYSTEM CAN]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
ii.
“U0129” and “U1022” are indicated. This means ECM cannot receive the signal from ABS. Draw a line to
indicate an error between ECM and ABS (line 1-b-ii in the figure below).
2. Based on information received from the printed or saved All DTC Reading, place a check mark on the
known good HEV SYSTEM CAN communication line between ECM and HV ECU.
a. Through the previous procedure, the circuit between EPS splice and ABS splice has the most amount of
lines (shade 2-a in the figure below).
b. Place a check mark on the known good lines to establish the error circuit.
JPMIA0255GB
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