vehicle driving conditions from this signal input from terminal ... After confirming DTC P0120, use the OBD II scan tool or TOYOTA hand-held tester to confirm the ...
Throttle Position Sensor/Switch ”A” Circuit Malfunction
CIRCUIT DESCRIPTION
Throttle Position Sensor
The throttle position sensor is mounted in the throttle body and detects the throttle valve opening angle. When the throttle valve is fully closed, a voltage of approximately 0.3 - 0.8 V is applied to terminal VTA of the ECM. The voltage applied to the terminals VTA of the ECM increases in proportion to the opening angle of the throttle valve and becomes approximately 3.2 - 4.9 V when the throttle valve is fully opened. The ECM judges the vehicle driving conditions from this signal input from terminal VTA, and uses it as one of the conditions for deciding the airfuel ratio correction, power increase correction and fuel-cut control etc.
ECM VC VTA E2
P24296
DTC No.
P0120
DTC Detecting Condition
Trouble Area
Condition (a) or (b) continues with more than 5 sec.: (a) VTA < 0.1 V (b) VTA > 4.9 V
Open or short in throttle position sensor circuit Throttle position sensor ECM
HINT: After confirming DTC P0120, use the OBD II scan tool or TOYOTA hand-held tester to confirm the throttle valve opening percentage. Throttle valve opening position expressed as percentage
Trouble Area
Throttle valve fully closed
Throttle valve fully open
0%
0%
VC line open VTA line open or short
Approx. 100 %
Approx. 100 %
E2 line open
2002 ECHO (RM884U)
Author:
Date:
207
DI-38 DIAGNOSTICS
-
ENGINE
WIRING DIAGRAM T2 Throttle Position Sensor
ECM
5V
R-W
1 E6
VC
3
Y-R
11 E6
VTA
2
BR
9 E6
E2
1
E1
A00311
INSPECTION PROCEDURE HINT:
If DTC P0110 (Intake Air Temp. Circuit Malfunction), P0115 (Engine Coolant Temp. Circuit Malfunction), P0120 (Throttle/Pedal Position Sensor/Switch ”A” Circuit Malfunction) are output simultaneously, E2 (sensor ground) may be open. Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc. at the time of the malfunction.
2002 ECHO (RM884U)
Author:
Date:
208
DI-39 DIAGNOSTICS
1
-
ENGINE
Connect the OBD II scan tool or TOYOTA hand-held tester, read the throttle valve opening percentage. PREPARATION: (a) Connect the OBD II scan tool or TOYOTA hand-held tester to DLC3. (b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand-held tester main switch ON. CHECK: Read the throttle valve opening percentage. OK: FI7052
OK
Throttle valve
Throttle valve opening position expressed as percentage
Fully open
Approx. 70 %
Fully closed
Approx. 10 %
Check for intermittent problems (See page DI-3 ).
NG
2
Check voltage between terminal VC of throttle position sensor connector and body ground.
ON
BE6653 A01842
2 (+)
PREPARATION: (a) Disconnect the throttle position sensor connector. (b) Turn the ignition switch ON. CHECK: Measure voltage between terminal 2 of the throttle position connector and body ground. OK: Voltage: 4.5 - 5.5 V
A02264
NG
Go to step 5.
OK
2002 ECHO (RM884U)
Author:
Date:
209
DI-40 DIAGNOSTICS
3
-
ENGINE
Check throttle position sensor (See page SF-32 ).
Throttle Position Sensor 3 2 1
PREPARATION: Disconnect the throttle position sensor connector. CHECK: Measure resistance between terminals 1, 3 and 2 of the throttle position sensor. OK: Terminals
Throttle valve
Resistance kΩ
1-2
2.5 - 5.9
Fully closed
0.2 - 5.7
Fully open
2.0 - 10.2
A01843
1-3
NG
Replace throttle position sensor.
OK
4
Check voltage between terminals VTA and E2 of ECM connector. ON
VTA
E2 (+)
PREPARATION: (a) Remove the connector cover from the ECM. (b) Turn the ignition switch ON. CHECK: Measure voltage between terminals VTA and E2 of the ECM connector. OK:
(-) A09036
NG
Throttle valve
Voltage
Fully closed
0.3 - 1.0 V
Fully open
3.2 - 4.9 V
Check for open and short in harness and connector between ECM and throttle position sensor (VTA or E2 line) (See page IN-29 ).
OK
Check and replace ECM (See page IN-29 ).
2002 ECHO (RM884U)
Author:
Date:
210
DI-41 DIAGNOSTICS
5
ENGINE
Check voltage between terminals VC and E2 of ECM connector. PREPARATION: (a) Remove the connector cover from the ECM. (b) Turn ignition switch ON. CHECK: Measure voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 - 5.5 V
ON VC
BE6653 P23813
-
(+)
(-)
E2 A00252
NG
Check and replace ECM (See page IN-29 ).
OK
Check for open in harness and connector between ECM and sensor (VC line) (See page IN-29 ).
P1780. Park/Neutral Position Switch Malfunction. CIRCUIT DESCRIPTION. The neutral start switch detects the shift lever position and sends signals to the ECM.
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as the voltage supplied to the stop lights. The STP signal is ...
Voltage output of the heated oxygen sensor remains at 0.40 V or more, or 0.50 V or less when the vehicle is driven at 40 km/h. (25 mph) or more after the engine ...
The knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelec- tric element which generates a voltage when it ...
Hubbell Incorporated (Delaware) ... Follow the general cleaning procedures established by your facility for your ... in damage to the circuit board assembly.
CIRCUIT DESCRIPTION. The door unlock detection switch is built in the door lock motor assembly. This switch is ON when the door lock knob is in the unlock ...
With IG1 terminal voltage at 8.5 V - 19 V, and when ABS is in non-operation stop light switch circuit is open for 0.3 sec. or longer. â¢Stop light valve. â¢Stop light ...
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because ... CHECK: Measure voltage between terminals IGF of the ECM connector.
CIRCUIT DESCRIPTION. The key unlock warning switch goes ON when the ignition key is inserted in the key cylinder and goes OFF when the ignition key is ...
plied to the intake air temp. sensor from the terminal THA via ... After confirming DTC P0110, use the OBD II scan tool or TOYOTA hand-held tester to confirm the ...
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because ... During cranking or idling, check between terminals G2 and. NE-, NE ...
Shift solenoid valve ST is switched ON-OFF by a signal from ECM so that let in or out timing of 2nd brake is adjusted by operating orifice control valve. Therefore ...
When you push the SinkTop Switch⢠button, you switch electrical power between the two outlets on the power module. This feature allows a second appliance ...
Over the last few months we have been looking at electrical wiring in your plane. The basic layout is for power to come from either the battery or alternator.
This enclosure includes a lockout provision: ON-OFF control knob (in the OFF position) .... INSTALLATION INSTRUCTIONS â This enclosure may be mounted for top, bottom, ..... Auxiliary contacts are suitable for use on a circuit capable of delivering
inch (8 mm) diameter shackle of a suitable padlock or Lockout device to isolate energy from the connected equipment as a method of compliance to OSHA Lockout/Tagout Regulation 29 CFR Part 1910.147. This feature does NOT isolate the power supplied to