Nissan Altima L32. Manual - part 256

POWER SUPPLY AND GROUND CIRCUIT

EC-145

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F2, E11

• Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

7.

CHECK ECM POWER SUPPLY CIRCUIT-II

1. Reconnect ECM harness connectors.

2. Turn ignition switch ON.

3. Check the voltage between IPDM E/R harness connector and

ground.

Is the inspection result normal?

YES

>> Go to 

EC-470, "Diagnosis Procedure"

.

NO

>> GO TO 8.

8.

CHECK ECM POWER SUPPLY CIRCUIT-III

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 14.

NO-1 >> Battery voltage does not exist: GO TO 9.

NO-2 >> Battery voltage exists for more than a few seconds: GO TO 12.

9.

CHECK ECM POWER SUPPLY CIRCUIT-IV

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 12.

10.

CHECK ECM POWER SUPPLY CIRCUIT-V

1. Disconnect ECM harness connector.

2. Disconnect IPDM E/R harness connector E18.

3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

IPDM E/R

Ground

Voltage

Connector

Terminal

F10

53

Ground

Battery voltage

JMBIA1581ZZ

ECM

Ground

Voltage

Connector

Terminal

E10

105

Ground

After turning ignition switch OFF, battery volt-
age will exist for a few seconds, then drop ap-
proximately 0 V.

PBIB3037E

ECM

Ground

Voltage

Connector

Terminal

F14

24

Ground

Battery voltage

JMBIA1582ZZ

EC-146

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

POWER SUPPLY AND GROUND CIRCUIT

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 17.

NO

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.

• Junction block connectors E44, E45

• Harness for open or short between ECM and IPDM E/R

>> Repair open circuit or short to ground or short to power in harness or connectors.

12.

CHECK ECM POWER SUPPLY CIRCUIT-VI

1. Disconnect ECM harness connector.

2. Disconnect IPDM E/R harness connector F10.

3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair open circuit or short to ground or short power in harness or connectors.

13.

CHECK 15A FUSE

1. Disconnect 15A fuse (No. 42) from IPDM E/R.

2. Check 15A fuse.
Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Replace 15A fuse.

14.

CHECK GROUND CONNECTION-II

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in 

GI-45, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Repair or replace ground connection.

15.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II

1. Disconnect ECM harness connector.

2. Check the continuity between ECM harness connector and ground.

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E10

105

E18

10

Existed

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F14

24

F10

69

Existed

POWER SUPPLY AND GROUND CIRCUIT

EC-147

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 17.

NO

>> GO TO 16.

16.

DETECT MALFUNCTIONING PART

Check the following.

• Harness or connectors F2, E11

• Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

17.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> Repair open circuit or short to power in harness or connectors.

ECM

Ground

Continuity

Connector

Terminal

F14

12

Ground

Existed

16

E10

107

108

111

112

EC-148

< COMPONENT DIAGNOSIS >

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U0101 CAN COMM CIRCUIT

U0101 CAN COMM CIRCUIT

Description

INFOID:0000000004349187

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic 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 transmits/receives data but selectively reads required data only.

DTC Logic

INFOID:0000000004349188

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 3 seconds.

2. Check DTC.
Is DTC detected?

YES

>>

EC-148, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349189

Go to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

U0101

Lost communication 
with TCM

When ECM is not transmitting or receiving CAN com-
munication signal of OBD (emission-related diagno-
sis) with TCM for 2 seconds or more.

• CAN communication line between 

TCM and ECM
(CAN communication line is open or 
shorted)