Infiniti F50. Manual - part 445

DTC P1102 MAF SENSOR

EC-421

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

EBS00MH1

RETIGHTEN GROUND SCREWS

Turn ignition switch “OFF”.

Loosen and retighten engine ground screws.

>> GO TO 2.

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch “OFF”]

●

For a few seconds after turning ignition
switch “OFF”

0 - 1.0V

[Ignition switch “OFF”]

●

More than a few seconds passed after turn-
ing ignition switch “OFF”

BATTERY VOLTAGE
(11 - 14V)

B/Y

Mass air flow sensor

[Engine is running]

●

Warm-up condition

●

Idle speed

1.1 - 1.5V

[Engine is running]

●

Warm-up condition

●

Engine speed is 2,500 rpm.

1.7 - 2.4V

103

Sensor power supply

[Ignition switch “ON”]

Approximately 5V

109

Mass air flow sensor ground

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

163
166

R
R

Power supply for ECM

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

PBIB0011E

EC-422

DTC P1102 MAF SENSOR

CHECK MAF SENSOR POWER SUPPLY CIRCUIT

Disconnect MAF sensor harness connector.

Turn ignition switch “ON”.

Check voltage between MAF sensor terminals 2, 4 and ground
with CONSULT-II or tester.

OK or NG

>> GO TO 4.

>> GO TO 3.

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M135, F105

●

Harness for open or short between mass air flow sensor and ECM relay

●

Harness for open or short between mass air flow sensor and ECM

>> Repair harness or connectors.

CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch “OFF”.

Disconnect ECM harness connector.

Check harness continuity between MAF sensor terminal 3 and ECM terminal 109.
Refer to Wiring Diagram.

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

OK or NG

>> GO TO 5.

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

PBIB0012E

Terminal

Voltage

Approximately 5V

Battery voltage

PBIB0076E

Continuity should exist.

DTC P1102 MAF SENSOR

EC-423

CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check harness continuity between MAF sensor terminal 1 and ECM terminal 91.
Refer to Wiring Diagram.

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

OK or NG

>> GO TO 6.

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

CHECK MASS AIR FLOW SENSOR

Refer to

EC-423, "Component Inspection"

OK or NG

>> GO TO 7.

>> Replace mass air flow sensor.

CHECK INTERMITTENT INCIDENT

Refer to

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

>> INSPECTION END

Component Inspection

EBS00MH2

MASS AIR FLOW SENSOR

Reconnect harness connectors disconnected.

Start engine and warm it up to normal operating temperature.

Check voltage between ECM terminal 91 (Mass air flow sensor
signal) and ground.

*: Check for liner voltage rise in response to engine being increased to about
4,000 rpm.

If the voltage is out of specification, proceed the following.

●

Turn ignition switch “OFF”.

●

Disconnect mass air flow sensor harness connector and reconnect it again.

●

Perform steps 2 and 3 again.

If NG, remove mass air flow sensor from air duct. Check hot film for damage or dust.

If NG, clean or replace mass air flow sensor.

Removal and Installation

EBS00MH3

MASS AIR FLOW SENSOR

Refer to

EM-15, "AIR CLEANER AND AIR DUCT"

Continuity should exist.

Condition

Voltage V

Ignition switch “ON” (Engine stopped.)

Approx. 1.0

Idle (Engine is warmed-up to normal operating
temperature.)

1.1 - 1.5

2,500 rpm (Engine is warmed-up to normal
operating temperature.)

1.7 - 2.4

Idle to about 4,000 rpm*

1.1 - 1.5 to Approx. 4.0

PBIB0078E

EC-424

DTC P1111, P1136 IVT CONTROL SOLENOID VALVE

PFP:23796

Component Description

EBS00MH4

Intake valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil
amount and direction of flow through intake valve timing control unit
or stops oil flow.
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the intake valve angle at the control
position.

CONSULT-II Reference Value in Data Monitor Mode

EBS00MH5

Specification data are reference values.

On Board Diagnosis Logic

EBS00MH6

DTC Confirmation Procedure

EBS00MH7

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

WITH CONSULT-II

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Maintain the following conditions for at least 5 seconds.

If 1st trip DTC is detected, go to

EC-428, "Diagnostic Procedure"

WITH GST

Following the procedure “WITH CONSULT-II” above.

PBIB1842E

MONITOR ITEM

CONDITION

SPECIFICATION

INT/V SOL (B1)
INT/V SOL (B2)

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

0% - 2%

2,000 rpm

Approx. 25% - 50%

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1111
1111
(bank 1)

Intake valve timing control
solenoid valve circuit

An improper voltage is sent to the ECM
through intake valve timing control solenoid
valve.

●

Harness or connectors
(Intake valve timing control solenoid
valve circuit is open or shorted.)

●

Intake valve timing control solenoid valve.

P1136
1136
(bank 2)

ENG SPEED

More than idle speed

Selector lever

“P” or “N” position

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