P1120

COMPONENT DESCRIPTION
The secondary throttle position sensor responds to the movement of the throttle motor which is controlled by the TAC module.
This sensor is a kind of potentiometer which transforms the secondary throttle position into output voltage, and emits the voltage signal to the TAC module. In addition, the sensor detects the opening and closing speed and position of the secondary throttle valve and feeds the voltage signal to the TAC module.
Another case is when the secondary throttle valve opening becomes smaller than the ordinary throttle valve opening due to TCS operation. In this case, the signal from the secondary throttle valve is used for engine control. This replaces the signal from the ordinary throttle position sensor. The signal of the secondary throttle valve first enters the TAC module, from where it is sent to the ECM.




CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and (128) (ECCS ground).




OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the secondary throttle position sensor circuit. During this check, a DTC might not be confirmed.

WARNING: Before touching the secondary throttle valve, be sure to disconnect the throttle motor harness connector. Failure to do so may cause injury due to accidental actuation of the valve.




With Consult
1) Start engine and warm it up to normal operating temperature.
2) Turn ignition switch "OFF" and disconnect throttle motor harness connector.
3) Remove intake air duct.
4) Turn ignition switch "ON".
5) Select "MANUAL TRIG" and "HI SPEED" in "DATA MONITOR" mode with consult
6) Select "THRT/P SEN2" in "DATA MONITOR" mode with CONSULT.
7) Press RECORD on CONSULT SCREEN at the same time close the secondary throttle valve by hand.
8) Print out the recorded data and check the following:
- The voltage when secondary throttle valve is closed by hand is approximately 0.60 - 1.15V.
- The voltage decrease is linear in response to secondary throttle valve closing.
- The voltage when secondary throttle valve is fully opened is approximately 4.3 - 4.7V.

OR




Without Consult
1) Start engine and warm it up to normal operating temperature.
2) Turn ignition switch "OFF" and disconnect throttle motor harness connector.
3) Remove intake air duct.
4) Turn ignition switch "ON".
5) Check the voltage between ECM terminals (66) and (128) (ground) and check the following:
- The voltage when secondary throttle valve is closed by hand is approximately 0.4 - 0.86V.
- The voltage decrease is linear in response to secondary throttle valve closing.
- The voltage when secondary throttle valve is fully opened is approximately 3.3 - 3.5V.

PAGE REFERENCE:

DIAGNOSTIC PROCEDURE




WIRING DIAGRAM

COMPONENT INSPECTION
Secondary Throttle Position Sensor







1. Turn ignition switch "OFF".
2. Disconnect secondary throttle position sensor harness connector.
3. Disconnect throttle motor harness connector.
4. Remove intake air duct.
5. Make sure that resistance between terminals (2) and (1) changes when opening secondary throttle valve manually.