Infiniti F50. Manual - part 442

DTC P0605 ECM

EC-409

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2. 

REPLACE ECM

1.

Replace ECM.

2.

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

BL-200, "ECM

Re-communicating Function"

 .

3.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

4.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

5.

Perform 

EC-46, "Idle Air Volume Learning"

 .

>> INSPECTION END

EC-410

DTC P0650 MIL

DTC P0650 MIL

PFP:24810

Component Description

EBS00MGM

Malfunction Indicator Lamp (MIL) is located on the instrument panel. When the ignition switch is turned ON
without engine running, MIL will light up. This is a bulb check. When the engine is started, MIL should go off. If
MIL remains on, the on board diagnostic system has detected an engine system malfunction.

On Board Diagnosis Logic

EBS00MGN

The MIL will not light up for this diagnosis.

FAIL-SAFE MODE

ECM enters fail-safe mode when both DTC P0650 and another DTC, which calls for MIL to light up, are
detected at the same time.

DTC Confirmation Procedure

EBS00MGO

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.

 WITH CONSULT-II

1.

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

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and let it idle for 1 second.

4.

If 1st trip DTC is detected, go to 

EC-412, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0650
0650

Malfunction indicator 
lamp (MIL) control circuit

●

An excessively high voltage is sent to ECM 
through the MIL circuit under the condition 
that calls for MIL light up.

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An excessively low voltage is sent to ECM 
through the MIL circuit under the condition 
that calls for MIL not to light up.

●

Harness or connectors
(MIL circuit is open or shorted.)

●

MIL

Detected items

Engine operating condition in fail-safe mode

MIL circuit

Engine speed will not rise more than 2,500 rpm due to the fuel cut

SEF058Y

DTC P0650 MIL

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Wiring Diagram

EBS00MGP

TBWM0104E

EC-412

DTC P0650 MIL

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.

Diagnostic Procedure

EBS00MGQ

1. 

CHECK MIL POWER SUPPLY

1.

Turn ignition switch “OFF”.

2.

Disconnect combination meter harness connector.

3.

Turn ignition switch “ON”.

4.

Check voltage between combination meter terminals 59 and
ground with CONSULT-II or tester

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector M1

●

10A fuse

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Joint connector-4

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Harness for open or short between fuse block (J/B) and combination meter

>> Repair harness or connectors.

3. 

CHECK MIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch “OFF”.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 35 and combination meter terminal 65.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

35

Y/G

MIL

[Ignition switch “ON”]

0 - 1.0V

[Engine is running]

●

Idle speed

BATTERY VOLTAGE
(11 - 14V)

Voltage: Battery voltage

PBIB0086E

Continuity should exist.