Infiniti F50. Manual — part 444

DTC P1065 ECM POWER SUPPLY

EC-417

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4.

PERFORM DTC CONFIRMATION PROCEDURE

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-414

.

5.

Is the 1st trip DTC P1065 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-414

.

5.

Is the 1st trip DTC P1065 displayed again?

Yes or No

Yes

>> GO TO 5.

No

>> INSPECTION END

5.

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-418

DTC P1102 MAF SENSOR

DTC P1102 MAF SENSOR

PFP:22680

Component Description

EBS00MGW

The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. It consists of a hot film that is supplied with electric current from
the ECM. The temperature of the hot film is controlled by the ECM a
certain amount. The heat generated by the hot film is reduced as the
intake air flows around it. The more air, the greater the heat loss.
Therefore, the ECM must supply more electric current to maintain
the temperature of the hot film as air flow increases. The ECM
detects the air flow by means of this current change.

CONSULT-II Reference Value in Data Monitor Mode

EBS00MGX

Specification data are reference values.

On Board Diagnosis Logic

EBS00MGY

This self-diagnosis has the one trip detection logic.

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

SEC266C

MONITOR ITEM

CONDITION

SPECIFICATION

MAS A/F SE-B1

●

Engine: After warming up

●

Air conditioner switch: OFF

●

Selector lever: P or N

●

No load

Idle

Approx. 1.1 - 1.5V

2,500 rpm

Approx. 1.7 - 2.4V

CAL/LD VALUE

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

15% - 35%

2,500 rpm

10% - 35%

MASS AIRFLOW

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

3.8 - 5.2 g·m/s

2,500 rpm

16.0 - 21.5 g·m/s

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1102
1102

Mass air flow sensor circuit
range/performance problem

A voltage from the sensor is constantly
approx.1.0V when engine is running.

●

Harness or connectors
(The sensor circuit is open or shorted.)

●

Mass air flow sensor

Detected items

Engine operating condition in fail-safe mode

Mass air flow sensor circuit

Engine speed will not rise more than 2,400 rpm due to the fuel cut.

DTC P1102 MAF SENSOR

EC-419

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DTC Confirmation Procedure

EBS00MGZ

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”.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and wait at least 5 seconds.

4.

If DTC is detected, go to

EC-421, "Diagnostic Procedure"

.

WITH GST

Follow the procedure “WITH CONSULT-II” above.

SEF058Y

EC-420

DTC P1102 MAF SENSOR

Wiring Diagram

EBS00MH0

TBWM0142E