Infiniti I30 (A33). Manual — part 216
SEF177Y
PROCEDURE FOR MALFUNCTION C
NHEC0078S03
CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-II
NHEC0078S0301
1)
Start engine and warm it up to normal operating temperature.
2)
Turn ignition switch “OFF” and wait at least 10 seconds.
3)
Turn ignition switch “ON”.
4)
Select “MANU TRIG” in “DATA MONITOR” mode with CON-
SULT-II.
5)
Select “THRTL POS SEN” and “ABSOL TH·P/S” in “DATA
MONITOR” mode with CONSULT-II.
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-182.
If OK, go to following step.
SEF245YB
8)
Select “AUTO TRIG” in “DATA MONITOR” mode with CON-
SULT-II.
SEF178Y
9)
Maintain the following conditions for at least 10 consecutive
seconds.
ENG SPEED
More than 2,000 rpm
MAS AIR/FL SE
More than 3.2V
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.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
DTC Confirmation Procedure (Cont’d)
EC-179
10) If 1st trip DTC is detected, go to “Diagnostic Procedure”,
SEF305X
With GST
NHEC0078S0302
1)
Start engine and warm it up to normal operating temperature.
2)
Maintain the following conditions for at least 10 consecutive
seconds.
Gear position
Suitable position
Engine speed
More than 2,000 rpm
Engine coolant temperature
More than 70°C (158°F)
Voltage between ECM termi-
nal 91 (Mass air flow sensor
signal) and ground
More than 3.2V
3)
Select “MODE 7” with GST.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-182.
DTC P0120 THROTTLE POSITION SENSOR
DTC Confirmation Procedure (Cont’d)
EC-180
Wiring Diagram
NHEC0079
MEC803C
SEF652XB
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
Wiring Diagram
EC-181
Diagnostic Procedure
NHEC0080
1
INSPECTION START
Which malfunction A, B or C is duplicated?
MTBL0066
Type A, B or C
Type A or B
©
GO TO 4.
Type C
©
GO TO 2.
2
ADJUST THROTTLE POSITION SENSOR
Check the following items. Refer to “Basic Inspection”, EC-109.
MTBL0595
©
GO TO 3.
3
CHECK INTAKE SYSTEM.
1. Turn ignition switch “OFF”.
2. Check the following for connection.
I
Air duct
I
Vacuum hoses
I
Intake air passage between air duct to intake manifold collector
OK or NG
OK
©
GO TO 4.
NG
©
Reconnect the parts.
4
RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF255X
©
GO TO 5.
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure
EC-182
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