Infiniti M45 (Y34). Manual - part 430

DTC P0550 PSP SENSOR

EC-409

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6. 

CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal 118 and PSP sensor terminal 2.
Refer to Wiring Diagram.

2.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F6, E316

●

Harness for open or short between ECM and PSP sensor

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

8. 

CHECK PSP SENSOR

Refer to 

EC-409, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace PSP sensor.

9. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS002M8

POWER STEERING PRESSURE SENSOR

1.

Reconnect all harness connectors disconnected.

2.

Start engine and let it idle.

3.

Check voltage between ECM terminal 118 and ground under the
following conditions.

Removal and Installation

ABS00A7L

POWER STEERING PRESSURE SENSOR

Refer to 

PS-31, "HYDRAULIC LINE"

 .

Continuity should exist.

Condition

Voltage

Steering wheel: Being turned fully.

Approximately 3.6V

Steering wheel: Not being turned.

Approximately 0.6V

PBIB0190E

EC-410

DTC P0605 ECM

DTC P0605 ECM

PFP:23710

Component Description

ABS002M9

The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.

On Board Diagnosis Logic

ABS002MA

This self-diagnosis has one or two trip detection logic.

FAIL-SAFE MODE

ECM enters fail-safe mode when the malfunction A is detected.

DTC Confirmation Procedure

ABS002MB

Perform PROCEDURE FOR MALFUNCTION A first. If the 1st trip DTC cannot be confirmed, perform
PROCEDURE FOR MALFUNCTION B. If there is no malfunction on PROCEDURE FOR MALFUNCTION
B, perform PROCEDURE FOR MALFUNCTION C.

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.

PROCEDURE FOR MALFUNCTION A

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

If 1st trip DTC is detected, go to 

EC-411, "Diagnostic Procedure"

.

 With GST

Follow the procedure With CONSULT-II above.

SEF093X

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0605
0605

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.

Detected items

Engine operation condition in fail-safe mode

Malfunction A

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 
degrees) by the return spring.
When the accelerator pedal depressed value reaches a throttle opening of 30 degrees or more, the throttle valve 
opens to a maximum of 20 degrees by the accelerator wire.

SEF058Y

DTC P0605 ECM

EC-411

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PROCEDURE FOR MALFUNCTION B

 With CONSULT-II

1.

Turn ignition switch ON and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

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

4.

If 1st trip DTC is detected, go to 

EC-411, "Diagnostic Procedure"

.

 With GST

Follow the procedure With CONSULT-II above.

PROCEDURE FOR MALFUNCTION C

 With CONSULT-II

1.

Turn ignition switch ON and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

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

4.

Repeat step 3 for 32 times.

5.

If 1st trip DTC is detected, go to 

EC-411, "Diagnostic Procedure"

.

 With GST

Follow the procedure With CONSULT-II above.

Diagnostic Procedure

ABS002MC

1. 

INSPECTION START

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELF DIAG RESULTS” mode with CONSULT-II.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-410

 .

5.

Is the 1st trip DTC P0605 displayed again?

 With GST

1.

Turn ignition switch ON.

2.

Select MODE 4 with GST.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-410

 .

5.

Is the 1st trip DTC P0605 displayed again?

Yes or No

Yes

>> GO TO 2.

No

>> INSPECTION END

SEF058Y

SEF058Y

EC-412

DTC P0605 ECM

2. 

REPLACE ECM

1.

Replace ECM.

2.

Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to

BL-174, "ECM Re-Communicating Function"

 .

3.

Perform 

EC-44, "Accelerator Pedal Released Position Learning"

 .

4.

Perform 

EC-44, "Throttle Valve Closed Position Learning"

 .

5.

Perform 

EC-44, "Idle Air Volume Learning"

 .

>> INSPECTION END