Infiniti Q45 (FY33). Manual — part 213

Tandem Throttle Position Sensor

This diagnosis is for tandem throttles (main throttle and secondary
throttle). The quantity of intake air is determined by these two
throttle valves. A rationality check is then carried out by ECM after
monitoring the signals of these two throttle position sensors.

ON BOARD DIAGNOSIS LOGIC

Diagnostic Trouble

Code No.

Malfunction is detected when ...

Check Items

(Possible Cause)

P1125
1502

Rationally incorrect voltage is entered to ECM com-
pared with the signals from mass air flow sensor,
camshaft position sensor and IACV-AAC valve.

Harness or connectors
(The sensor circuits are open or shorted.)

Throttle position sensor or secondary throttle posi-
tion sensor

Throttle actuator control (TAC) module

DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE

NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.

1) Start engine and warm it up to normal operating tem-

perature.

2) Stop engine and wait at least 5 seconds.
3) Turn ignition switch “ON”.
4) Select “DATA MONITOR” mode with CONSULT-II.
5) Start engine and run it for 15 seconds.

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

1) Start engine and warm it up to normal operating tem-

perature.

2) Stop engine and wait at least 5 seconds.
3) Start engine and run it for 15 seconds.
4) Select “MODE 7” with GST.

1) Start engine and warm it up to normal operating tem-

perature.

2) Stop engine and wait at least 5 seconds.
3) Start engine and run it for 15 seconds.
4) Turn ignition switch “OFF”, wait at least 5 seconds and

then turn “ON”.

5) Perform “Diagnostic Test Mode II (Self-diagnostic

results)” with ECM.

DIAGNOSTIC PROCEDURE

Refer to TROUBLE DIAGNOSIS FOR DTC P0120, EC-150 OR
Refer to TROUBLE DIAGNOSIS FOR DTC P1120, EC-375.

IDX

TROUBLE DIAGNOSIS FOR DTC P1125

EC-381

SEF599T

Intake Valve Timing Control Position Sensor
(P1140: Left bank), (P1145: Right bank)

COMPONENT DESCRIPTION

The intake valve timing control position sensor is located rearmost
of the left-bank cylinder head. This sensor detects a signal (intake
valve position) generated by the cutout portion of camshaft and
sends it to the ECM. This sensor is not used to control the engine
system. It is used only for the on board diagnosis of intake valve
timing control.

CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

INT/V TIM-B1
INT/V TIM-B2

Engine is running.

Advanced angle (degree) of the intake camshaft should be
displayed.

ECM TERMINALS AND REFERENCE VALUE

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

CAUTION:

Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA

(DC voltage)

(RH)

R/L

Intake valve timing con-
trol position sensors

Engine is running.

Idle speed

Approximately 0V

SEF551T

(LH)

L/W

Engine is running.

Engine speed is 2,000 rpm.

Approximately 0V

SEF552T

ON BOARD DIAGNOSIS LOGIC

Diagnostic Trouble

Code No.

Malfunction is detected when .

Check Items

(Possible Cause)

P1140
1303
(Left bank)

The proper pulse signal from the intake valve timing
control position sensors is not sent to ECM while the
engine is running at the specified engine speed.

Harness or connectors
(The left bank intake valve timing control position
sensor circuit is open.)

Intake valve timing control position sensor

Accumulation of debris to the signal pick-up portion
of the camshaft

P1145
1304
(Right bank)

TROUBLE DIAGNOSIS FOR DTC P1140 (B1), P1145 (B2)

EC-382

SEF276Y

DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE

NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.

1) Turn ignition switch “ON” and select “DATA MONITOR”

mode with CONSULT-II.

2) Start engine and keep the engine speed at 2,000 rpm

and wait at least 15 seconds.

3) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-386.

1) Start engine and keep the engine speed at 2,000 rpm

and wait at least 15 seconds.

2) Select “MODE 7” with GST.
3) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-386.

1) Start engine and keep the engine speed at 2,000 rpm

and wait at least 15 seconds.

2) Turn ignition switch “OFF”, wait at least 5 seconds and

then turn “ON”.

3) Perform “Diagnostic Test Mode II (Self-diagnostic

results)” with ECM.

4) If 1st trip DTC is detected, go to “DIAGNOSTIC

PROCEDURE”, EC-386.

IDX

TROUBLE DIAGNOSIS FOR DTC P1140 (B1), P1145 (B2)

Intake Valve Timing Control Position Sensor
(P1140: Left bank), (P1145: Right bank) (Cont’d)

EC-383

LEFT BANK

TEC757

TROUBLE DIAGNOSIS FOR DTC P1140 (B1), P1145 (B2)

Intake Valve Timing Control Position Sensor
(P1140: Left bank), (P1145: Right bank) (Cont’d)

EC-384

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Infiniti Q45 (FY33). Manual — part 213

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