Infiniti Q45 (FY33). Manual - part 156

SEF021P

SEF265Y

SEF351W

6) Press RECORD on CONSULT-II screen at the same

time accelerator pedal is depressed.

7) Print out the recorded graph and check the following:

I

The voltage rise is linear in response to accelerator
pedal depression.

I

The voltage when accelerator pedal is fully depressed
is approximately 4V.
If NG, go to “DIAGNOSTIC PROCEDURE”, EC-155.
If OK, go to following step.

8) Select “AUTO TRIG” in “DATA MONITOR” mode with

CONSULT-II.

9) Maintain the following conditions for at least 10 con-

secutive seconds.
CMPS-RPM (POS): More than 2,000 rpm
MAS AIR/FL SE: More than 3V
COOLAN TEMP/S: More than 70°C (158°F)
Selector lever: Suitable position
Driving location: Driving vehicle uphill (Increased

engine load) will help maintain
the driving conditions required
for this test.

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

PROCEDURE”, EC-158.

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

1) Maintain the following conditions for at least 10 con-

secutive seconds.
Gear position: Suitable position
Engine speed: More than 2,000 rpm
Voltage between ECM terminal

q

65

and

128

(ECM

ground):

More than 3V

COOLAN TEMP/S: More than 70°C (158°F)

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

PROCEDURE”, EC-158.

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

1) Maintain the following conditions for at least 10 con-

secutive seconds.
Gear position: Suitable position
Engine speed: More than 2,000 rpm
Voltage between ECM terminal

q

65

and

128

(ECM

ground):

More than 3V

Voltage between ECM terminal

q

67

and

128

(ECM

ground):

Less than 1.5V

2) Stop the vehicle, turn ignition switch “OFF”, wait at least

5 seconds and then turn “ON”.

3) Perform “DIAGNOSTIC TEST MODE (Self-diagnostic

results)” with ECM.

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

PROCEDURE”, EC-158.

GI

MA

EM

LC

FE

AT

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSIS FOR DTC P0120

Throttle Position Sensor (Cont’d)

EC-153

TEC044M

TROUBLE DIAGNOSIS FOR DTC P0120

Throttle Position Sensor (Cont’d)

EC-154

SEF053T

SEF119T

SEF122T

SEF123T

SEF387U

DIAGNOSTIC PROCEDURE

If the trouble is duplicated after “Procedure for malfunction
A”, perform “Procedure A” below. If the trouble is duplicated
after “Procedure for malfunction B”, perform “Procedure B”
on the next page. If the trouble is duplicated after “Procedure
for malfunction C”, perform “Procedure C” on EC-158.

Procedure A

INSPECTION START

1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground

screws.

CHECK POWER SUPPLY.
1. Turn ignition switch “OFF”.
2. Disconnect throttle position sensor har-

ness connector.

3. Turn ignition switch “ON”.
4. Check voltage between terminal

q

4

and

ground with CONSULT-II or tester.
Voltage: Approximately 5V

OK

E

NG

Repair harness or connec-
tors.

CHECK GROUND CIRCUIT.
1. Turn ignition switch “OFF”.
2. Check harness continuity between ter-

minal

q

2

and engine ground.

Continuity should exist.
If OK, check harness for short to power.

OK

E

NG

Check the following.

I

Harness connectors

F63

,

M49

I

Harness connectors

M4

,

B3

I

Joint connector-16

I

Harness for open or
short between throttle
position sensor and ECM

I

Harness for open or
short between throttle
position sensor and TCM
(Transmission Control
Module)

I

Harness for open or
short between throttle
position sensor and
throttle actuator control
(TAC) module

If NG, repair open circuit or
short to power in harness
or connectors.

CHECK INPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM

terminal

q

63

and terminal

q

1

.

Continuity should exist.
If OK, check harness for short to
ground and short to power.

OK

E

NG

Repair harness or connec-
tors.

CHECK COMPONENT
(Throttle position sensor).
Refer to “COMPONENT INSPECTION”,
EC-159.

OK

E

NG

Replace throttle position
sensor. To adjust it, per-
form “BASIC
INSPECTION”, EC-91.

q

A

(Go to next page.)

GI

MA

EM

LC

FE

AT

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

TROUBLE DIAGNOSIS FOR DTC P0120

Throttle Position Sensor (Cont’d)

H

H

H

H

H

H

EC-155

q

A

Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.

INSPECTION END

SEF119T

SEF053T

SEF122T

Procedure B

INSPECTION START

1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground

screws.

CHECK POWER SUPPLY.
1. Disconnect throttle position sensor har-

ness connector.

2. Turn ignition switch “ON”.
3. Check voltage between terminal

q

4

and

ground with CONSULT-II or tester.
Voltage: Approximately 5V

OK

E

NG

Repair harness or connec-
tors.

q

A

(Go to next page.)

TROUBLE DIAGNOSIS FOR DTC P0120

Throttle Position Sensor (Cont’d)

H

H

H

H

H

EC-156