Nissan Frontier D22. Instruction — part 264
DTC P0121 TP SENSOR
EC-159
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
DTC P0121 TP SENSOR
PFP:16119
Component Description
UBS00D30
NOTE:
If DTC P0121 is displayed with DTC P0510, first perform trouble diagnosis for DTC P0510,
The throttle position sensor responds to the accelerator pedal movement. This sensor is a type of potentiome-
ter which transforms the throttle position into output voltage, and emits the voltage signal to the ECM. In addi-
tion, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the
ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sen-
sor. This sensor controls engine operation such as fuel cut. On the other hand, the “Wide open and closed
throttle position switch”, which is built into the throttle position sensor unit, is not used for engine control.
CONSULT-II Reference Value in Data Monitor Mode
UBS00D31
Specification data are reference values.
SEF105S
MONITOR ITEM
CONDITION
SPECIFICATION
THRTL POS SEN
●
Ignition switch: ON
(Engine stopped)
●
Engine: After warming up
Throttle valve: Fully closed
0.2 - 0.8V
Throttle valve: Fully opened
3.5 - 4.5V
ABSOL TH·P/S
●
Ignition switch: ON
(Engine stopped)
●
Engine: After warming up
Throttle valve: Fully closed
0.0%
Throttle valve: Fully opened
Approx. 80%
EC-160
[KA24DE]
DTC P0121 TP SENSOR
On Board Diagnosis Logic
UBS00D32
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.
DTC Confirmation Procedure
UBS00D33
Perform “PROCEDURE FOR MALFUNCTION A” first. If the DTC cannot be confirmed, perform “PRO-
CEDURE FOR MALFUNCTION B”.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
PROCEDURE FOR MALFUNCTION A
With CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for at least 10 seconds.
If idle speed is over 1,100 rpm, maintain the following conditions
for at least 10 seconds to keep engine speed below 1,100 rpm.
4.
If 1st trip DTC is detected, go to
EC-163, "Diagnostic Procedure"
With GST
Follow the procedure “With CONSULT-II”.
PROCEDURE FOR MALFUNCTION B
CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible Cause
P0121
Throttle position sensor
circuit range/performance
problem
A)
A high voltage from the sensor is sent to
ECM under light load driving condition.
●
Harness or connectors
(The throttle position sensor circuit is
open or shorted.)
●
Throttle position sensor
●
Fuel injector
●
Camshaft position sensor
●
Mass air flow sensor
B)
A low voltage from the sensor is sent to
ECM under heavy load driving condition.
●
Harness or connectors
(The throttle position sensor circuit is
open or shorted.)
●
throttle position sensor
●
Intake air leaks
Detected items
Engine operating condition in fail-safe mode
Throttle position sensor
circuit
Throttle position will be determined based on the injected fuel amount and the engine speed.
Therefore, acceleration will be poor.
Condition
Driving condition
When engine is idling
Normal
When accelerating
Poor acceleration
Selector lever
Suitable position except “N” (Higher gear
position such as 3rd or 4th is better to
keep low engine rpm.)
Accelerator pedal
Released
Vehicle speed
As slow as possible
SEF058Y
DTC P0121 TP SENSOR
EC-161
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
2.
Turn ignition switch OFF and wait at least 5 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 MON-
ITOR” mode with CONSULT-II.
6.
Press RECORD on CONSULT-II screen at the same time accel-
erator pedal is depressed.
7.
Print out the recorded graph and check the following:
–
The voltage rise is linear in response to accelerator pedal
depression.
–
The voltage when accelerator pedal is fully depressed is approx-
imately 4V.
If NG, go to
EC-163, "Diagnostic Procedure"
If OK, go to following step.
8.
Select “AUTO TRIG” in “DATA MONITOR” mode with CON-
SULT-II.
9.
Maintain the following conditions for at least 10 consecutive sec-
onds.
10. If 1st trip DTC is detected, go to
EC-163, "Diagnostic Procedure"
.
With GST
Follow the procedure “With CONSULT-II”.
ENG SPEED
More than 2,000 rpm
MAS A/F SE-B1
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.
SEF177Y
SEF245Y
SEF178Y
EC-162
[KA24DE]
DTC P0121 TP SENSOR
Wiring Diagram
UBS00D34
BBWA0547E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст