Nissan Altima L32. Manual - part 435

P0550 PSP SENSOR

EC-861

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

4. Check the voltage between ECM harness connector and ground

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace power steering pressure sensor.

ECM

Condition

Voltage

Connector

Terminal

F13

41

(Power steering pres-

sure sensor signal)

Steering 
wheel

Being turned.

0.5 - 4.5V

Not being 
turned.

0.4 - 0.8V

JMBIA1597ZZ

EC-862

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

P0603 ECM POWER SUPPLY

P0603 ECM POWER SUPPLY

Description

INFOID:0000000004349825

Battery voltage is supplied to the ECM even when the ignition switch

is turned OFF for the ECM memory function of the DTC memory, the

air-fuel ratio feedback compensation value memory, the idle air vol-

ume learning value memory, etc.

DTC Logic

INFOID:0000000004349826

DTC DETECTION LOGIC

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.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 1 second.

2. Start engine and let it idle for 1 second.

3. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.

4. Repeat steps 2 and 3 for four times.

5. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-862, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349827

1.

CHECK ECM POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

PBIA9222J

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0603

ECM power supply cir-
cuit

ECM back-up RAM system does not function 
properly.

• Harness or connectors

[ECM power supply (back-up) circuit is 
open or shorted.]

• ECM

P0603 ECM POWER SUPPLY

EC-863

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.

• 15A fuse (No. 42)

• IPDM E/R harness connector F10

• Harness for open or short between ECM and battery

>> Repair or replace harness or connectors.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness or connectors.

4.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

1. Turn ignition switch ON.

2. Select “SELF-DIAG RESULTS” mode with CONSULT-III.

3. Touch “ERASE”.

4. Perform DTC CONFIRMATION PROCEDURE.

See 

EC-862, "DTC Logic"

.

With GST

1. Turn ignition switch ON.

2. Select Service $04 with GST.

3. Perform DTC CONFIRMATION PROCEDURE.

See 

EC-862, "DTC Logic"

.

Is the 1st trip DTC P0603 displayed again?

YES

>> GO TO 5.

NO

>> INSPECTION END

5.

REPLACE ECM

1. Replace ECM.

2. Go to 

EC-563, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-

ment"

.

>> INSPECTION END

ECM

Ground

Voltage

Connector

Terminal

F13

77

Ground

Battery voltage

JMBIA1598ZZ

EC-864

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

P0605 ECM

P0605 ECM

Description

INFOID:0000000004349828

The ECM consists of a microcomputer and connectors for signal

input and output and for power supply. The ECM controls the engine.

DTC Logic

INFOID:0000000004349829

DTC DETECTION LOGIC

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.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

1. Turn ignition switch ON.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-865, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

1. wait at least 1 second.

2. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.

3. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-865, "Diagnosis Procedure"

.

NO

>> GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION C

1. wait at least 1 second.

2. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.

3. Repeat step 2 for 32 times.

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-865, "Diagnosis Procedure"

.

NO

>> INSPECTION END

PBIA9222J

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0605

Engine control module

A)

ECM calculation function is malfunctioning.

• ECM

B)

ECM EEP-ROM system is malfunctioning.

C)

ECM self shut-off function is malfunctioning.