Infiniti FX35 / FX45. Manual - part 414

 

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Infiniti FX35 / FX45. Manual - part 414

 

 

DTC P0550 PSP SENSOR

EC-417

< SERVICE INFORMATION >

[VQ35DE]

C

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EC

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3.

Check voltage between ECM terminal 12 and ground under the
following conditions.

Removal and Installation

INFOID:0000000001326261

POWER STEERING PRESSURE SENSOR

Refer to 

PS-37

.

Condition

Voltage

Steering wheel: Being turned

0.5 - 4.5V

Steering wheel: Not being turned

0.4 - 0.8V

MBIB0126E

EC-418

< SERVICE INFORMATION >

[VQ35DE]

DTC P0603 ECM POWER SUPPLY

DTC P0603 ECM POWER SUPPLY

Component Description

INFOID:0000000001326262

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.

On Board Diagnosis Logic

INFOID:0000000001326263

DTC Confirmation Procedure

INFOID:0000000001326264

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
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.

6.

If 1st trip DTC is detected, go to 

EC-420, "Diagnosis Procedure"

.

PBIB1164E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0603
0603

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

DTC P0603 ECM POWER SUPPLY

EC-419

< SERVICE INFORMATION >

[VQ35DE]

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Wiring Diagram

INFOID:0000000001326265

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TBWM1393E

EC-420

< SERVICE INFORMATION >

[VQ35DE]

DTC P0603 ECM POWER SUPPLY

Diagnosis Procedure

INFOID:0000000001326266

1.

CHECK ECM POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Check voltage between ECM terminal 121 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connector E211, M41
• 20A fuse
• IPDM E/R harness connector E8
• 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.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-139

.

OK or NG

OK

>> GO TO 4.

NG

>> 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-418, "DTC Confirmation Procedure"

.

5.

Is the 1st trip DTC P0603 displayed again?

 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-418, "DTC Confirmation Procedure"

.

4.

Is the 1st trip DTC P0603 displayed again?

Yes or No

Yes

>> GO TO 5.

No

>> INSPECTION END

5.

REPLACE ECM

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

121

R/W

Power supply for ECM 
(Back-up)

[Ignition switch OFF]

BATTERY VOLTAGE
(11 - 14V)

Voltage: Battery voltage

MBIB0026E

 

 

 

 

 

 

 

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