DTC P0122, P0123 TP SENSOR
[QG18DE]
DTC P0122, P0123 TP SENSOR PFP:16119
A
Component Description UBS00B4Z
Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds to EC
the throttle valve movement.
The throttle position sensor has the two sensors. These sensors are
a kind of potentiometers which transform the throttle valve position
into output voltage, and emit the voltage signal to the ECM. In addi- C
tion, these sensors detect the opening and closing speed of the
throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig- D
nals and the ECM controls the throttle control motor to make the
throttle valve opening angle properly in response to driving condi-
PBIB0145E
tion.
E
CONSULT-II Reference Value in Data Monitor Mode UBS00B50
Specification data are reference values.
F
MONITOR ITEM CONDITION SPECIFICATION
● Ignition switch: ON Accelerator pedal: Fully released More than 0.36V
THRTL SEN 1 (Engine stopped)
THRTL SEN 2* Accelerator pedal: Fully depressed Less than 4.75V G
● Shift lever: D (A/T), 1st (M/T)
*: Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.
On Board Diagnosis Logic UBS00B51
H
These self-diagnoses have the one trip detection logic.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause I
P0122 Throttle position sensor 2 An excessively low voltage from the TP sensor 2 ● Harness or connectors
0122 circuit low input is sent to ECM. (The TP sensor 2 circuit is open or
shorted.) J
(APP sensor 2 circuit is shorted.)
P0123 Throttle position sensor 2 An excessively high voltage from the TP sensor 2 ● Electric throttle control actuator
0123 circuit high input is sent to ECM.
(TP sensor 2)
Accelerator pedal position sensor. K
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up. L
Engine operation condition in fail-safe mode
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 M
degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.
Revision: July 2005 EC-213 2005 Sentra
DTC P0122, P0123 TP SENSOR
[QG18DE]
DTC Confirmation Procedure UBS00B52
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 10V at idle.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 1 second.
4. If DTC is detected, go toEC-216, "Diagnostic Procedure" .
SEF058Y
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Revision: July 2005 EC-214 2005 Sentra
DTC P0122, P0123 TP SENSOR
[QG18DE]
Wiring Diagram UBS00B53
EC
BBWA0678E
Revision: July 2005 EC-215 2005 Sentra
DTC P0122, P0123 TP SENSOR
[QG18DE]
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.
TERMI-
WIRE
NAL ITEM CONDITION DATA (DC Voltage)
COLOR
NO.
Sensor power supply
47 B [Ignition switch: ON] Approximately 5V
(Throttle position sensor)
[Ignition switch: ON]
● Engine stopped
More than 0.36V
● Shift lever: D (A/T), 1st (M/T)
● Accelerator pedal: Fully released
50 W Throttle position sensor 1
[Ignition switch: ON]
● Engine stopped
Less than 4.75V
● Shift lever: D (A/T), 1st (M/T)
● Accelerator pedal: Fully depressed
[Engine is running]
66 R Sensor ground ● Warm-up condition Approximately 0V
(Throttle position sensor) ● Idle speed
[Ignition switch: ON]
● Engine stopped
Less than 4.75V
● Shift lever: D (A/T), 1st (M/T)
● Accelerator pedal: Fully released
69 G Throttle position sensor 2
[Ignition switch: ON]
● Engine stopped
More than 0.36V
● Shift lever: D (A/T), 1st (M/T)
● Accelerator pedal: Fully depressed
Sensor power supply
91 R/G (Accelerator pedal position [Ignition switch: ON] Approximately 5V
sensor 2)
Diagnostic Procedure UBS00B54
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to EC-171 .
BBIA0515E
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
Revision: July 2005 EC-216 2005 Sentra
DTC P0122, P0123 TP SENSOR
[QG18DE]
2. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-I A
1. Disconnect electric throttle control actuator harness connector.
2. Turn ignition switch ON.
EC
D
BBIA0152E
3. Check voltage between electric throttle control actuator terminal E
1 and ground with CONSULT-II or tester.
Voltage: Approximately 5V
F
OK or NG
OK >> GO TO 7.
NG >> GO TO 3.
G
PBIB0082E H
3. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF. I
2. Disconnect ECM harness connector.
3. Check harness continuity between electric throttle control actuator terminal 1 and ECM terminal 47.
Refer to Wiring Diagram. J
Continuity should exist.
OK or NG K
OK >> GO TO 4.
NG >> Repair or replace open circuit.
L
4. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-III
Check harness for short to power and short to ground, between the following terminals.
M
ECM terminal Sensor terminal Reference Wiring Diagram
47 Electric throttle control actuator terminal 1 EC-398
91 APP sensor terminal 1 EC-573
OK or NG
OK >> GO TO 5.
NG >> Repair short to ground or short to power in harness or connectors.
5. CHECK APP SENSOR
Refer to EC-579, "Component Inspection"
OK or NG
OK >> GO TO 11.
NG >> GO TO 6.
Revision: July 2005 EC-217 2005 Sentra
DTC P0122, P0123 TP SENSOR
[QG18DE]
6. REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform EC-92, "Accelerator Pedal Released Position Learning" .
3. Perform EC-92, "Throttle Valve Closed Position Learning" .
4. Perform EC-92, "Idle Air Volume Learning" .
>> INSPECTION END
7. CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 66 and electric throttle control actuator terminal 5.
Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 69 and electric throttle control actuator terminal 2.
Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK THROTTLE POSITION SENSOR
Refer to EC-219, "Component Inspection" .
OK or NG
OK >> GO TO 11.
NG >> GO TO 10.
10. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform EC-92, "Throttle Valve Closed Position Learning" .
3. Perform EC-92, "Idle Air Volume Learning" .
>> INSPECTION END
11. CHECK INTERMITTENT INCIDENT
Refer to EC-164, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Revision: July 2005 EC-218 2005 Sentra
DTC P0122, P0123 TP SENSOR
[QG18DE]
Component Inspection UBS00B55
THROTTLE POSITION SENSOR A
1. Reconnect all harness connectors disconnected.
2. Perform EC-92, "Throttle Valve Closed Position Learning" .
3. Turn ignition switch ON. EC
4. Set selector lever to D position (A/T models) or 1st position (M/T models).
5. Check voltage between ECM terminals 50 (TP sensor 1 signal),
69 (TP sensor 2 signal) and ground under the following condi- C
tions.
Terminal Accelerator pedal Voltage D
50 Fully released More than 0.36V
(Throttle position sensor 1) Fully depressed Less than 4.75V
Fully released Less than 4.75V E
69
(Throttle position sensor 2) Fully depressed More than 0.36V
6. If NG, replace electric throttle control actuator and go to the next PBIB1060E
F
step.
7. Perform EC-92, "Throttle Valve Closed Position Learning" .
8. Perform EC-92, "Idle Air Volume Learning" . G
Remove and Installation UBS00B56
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-15, "Removal and Installation" . H
Revision: July 2005 EC-219 2005 Sentra
