17-24 SELF-DIAGNOSIS SYSTEM
Throttle Position Sensor (Service Code 11) (DTC P0120, P0121, P0122, P0220,
Measure the output voltage with the engine stopped and
with the connector joined.
Turn the ignition switch on.
Standard: (1) DC 1.20 ∼ 1.60 V at full throttle opening
(2) DC 3.40 ∼ 3.80 V at full throttle opening
Open the throttle, confirm the output voltage will be
When the throttle is ordinary position, the standard
value is not determined because there is some uncer-
tain elements, e.g. water temperature, throttle valve
initial opening, etc.
Turn the ignition switch off.
If the reading is out of the standard, replace the throttle
If the reading is within the standard, remove the ECU and
check the wiring for continuity between main harness con-
Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Throttle Position Sensor Connector [B]
V lead (ECU terminal 72) [C]
V/W lead (ECU terminal 79) [D]
BK lead (ECU terminal 80) [E]
If the wiring is good, check the ECU for its ground and
power supply (see ECU Power Supply Inspection in the
Fuel System (DFI) chapter).
If the ground and power supply are good, replace the ECU
(see ECU Removal/Installation in the Fuel System (DFI)