Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg cip0120
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DI-37
DIAGNOSTICS - ENGINE
DI6V0-02
DTC P0120 Throttle Position Sensor/Switch "A"
Circuit Malfunction
CIRCUIT DESCRIPTION
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
Throttle Position ECM to terminal VTA of the ECM. The voltage applied to the termi-
Sensor
nals VTA of the ECM increases in proportion to the opening
VC angle of the throttle valve and becomes approximately 3.2 - 4.9
VTA V when the throttle valve is fully opened. The ECM judges the
vehicle driving conditions from this signal input from terminal
E2 VTA, and uses it as one of the conditions for deciding the air-
fuel ratio correction, power increase correction and fuel-cut
control etc.
P24296
DTC No. DTC Detecting Condition Trouble Area
Condition (a) or (b) continues with more than 5 sec.: S Open or short in throttle position sensor circuit
P0120 (a) VTA < 0.1 V S Throttle position sensor
(b) VTA > 4.9 V S 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
VC line open
0% 0%
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
1
1 R-W VC
E6
11
3 Y-R VTA
E6
9
2 BR E2
E6
E1
A00311
INSPECTION PROCEDURE
HINT:
S If DTC P0110 (Intake Air Temp. Circuit Malfunction), P0115 (Engine Coolant Temp. Circuit Malfunc-
tion), P0120 (Throttle/Pedal Position Sensor/Switch "A" Circuit Malfunction) are output simultaneous-
ly, E2 (sensor ground) may be open.
S 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 - ENGINE
1 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 tes-
ter 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 Throttle valve opening position
Throttle valve
expressed as percentage
Fully open Approx. 70 %
Fully closed Approx. 10 %
OK Check for intermittent problems
(See page DI-3 ).
NG
2 Check voltage between terminal VC of throttle position sensor connector and
body ground.
PREPARATION:
ON 2 (+)
(a) Disconnect the throttle position sensor connector.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal 2 of the throttle position con-
nector and body ground.
OK:
Voltage: 4.5 - 5.5 V
BE6653
A01842 A02264
NG Go to step 5.
OK
2002 ECHO (RM884U)
Author : Date : 209
DI-40
DIAGNOSTICS - ENGINE
3 Check throttle position sensor (See page SF-32 ).
PREPARATION:
Throttle Position Sensor Disconnect the throttle position sensor connector.
CHECK:
3 Measure resistance between terminals 1, 3 and 2 of the throttle
2 position sensor.
OK:
1
Terminals Throttle valve Resistance k
1-2 2.5 - 5.9
A01843
Fully closed 0.2 - 5.7
1-3
Fully open 2.0 - 10.2
NG Replace throttle position sensor.
OK
4 Check voltage between terminals VTA and E2 of ECM connector.
ON 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.
VTA E2 OK:
(+) (-)
Throttle valve Voltage
A09036
Fully closed 0.3 - 1.0 V
Fully open 3.2 - 4.9 V
NG Check for open and short in harness and con-
nector between ECM and throttle position sen-
sor (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 - ENGINE
5 Check voltage between terminals VC and E2 of ECM connector.
ON PREPARATION:
(a) Remove the connector cover from the ECM.
VC
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals VC and E2 of the ECM
connector.
OK:
E2 Voltage: 4.5 - 5.5 V
(+) (-)
BE6653
P23813 A00252
NG Check and replace ECM (See page IN-29 ).
OK
Check for open in harness and connector be-
tween ECM and sensor (VC line)
(See page IN-29 ).
2002 ECHO (RM884U)
Author : Date : 211
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