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-II Reference Value In Data Monitor Mode:
ECM Terminals And Reference Value:
On Board Diagnosis Logic:
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If the 1st trip DTC cannot be confirmed, perform "Procedure for malfunction B".
NOTE: If "DIAGNOSTIC TROUBLE CODE 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
1. Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT-II.
2. Start engine and wait at least 5 seconds.
3. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".
OR
With Generic Scan Tool
Follow the procedure "With CONSULT-II" above.
Procedure for malfunction B.
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-II.
6. Select "THRTL/P SEN2" in "DATA MONITOR" mode with CONSULT-II.
7. Press RECORD on CONSULT-II 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 - 1.15 V.
- 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 - 4.7 V.
9. If NG, go to "DIAGNOSTIC PROCEDURE".
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 terminal (66) and ground, then check the following:
- The voltage when secondary throttle valve is closed by hand is approximately 0.4 - 0.86 V.
- 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 - 3.5 V.
6. If NG, go to "DIAGNOSTIC PROCEDURE".
EC-STPS-01:
EC-STPS-01 Connector View:
WIRING DIAGRAM
Super Multiple Junction (SMJ) Terminal Arrangement (B3, D1, D21, E66, M4, M6, M11, M12, M45, N1):
Super Multiple Junction (SMJ) Terminal Arrangement (B4, B101, E70, E81, F63, M3, M49, M50):
Part 1:
Part 2:
DIAGNOSTIC PROCEDURE
COMPONENT INSPECTION
Secondary throttle position sensor
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.
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.