Hint:
This dtc relates to the throttle position (tp) sensor.
Description
Refer to dtc p0120 (see page es-114).
Monitor description
The ecm uses the tp sensor to monitor the throttle valve opening angle.
This sensor transmits two signals: vta1 and vta2. Vta1 is used to detect the throttle opening angle and vta2 is used to detect malfunctions in vta1. The ecm performs several checks to confirm the proper operation of the tp sensor and vta1.
For each throttle opening angle, a specific voltage difference is expected between the outputs of vta1 and vta2. If the output voltage difference between the two signals deviates from the normal operating range, the ecm interprets this as a malfunction of the tp sensor. The ecm illuminates the mil and sets the dtc.
If the malfunction is not repaired successfully, the dtc is set 2 seconds after the engine is next started.
Monitor strategy
Typical enabling conditions
Typical malfunction thresholds
Fail-safe
When this dtc, as well as other dtcs relating to etcs (electronic throttle control system) malfunctions, is set, the ecm enters fail-safe mode. During fail-safe mode, the ecm cuts the current to the throttle actuator off, and the throttle valve is returned to a 6° throttle angle by the return spring. The ecm then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.
Inspection procedure
Hint:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
Parts location
System diagram
System description
Cruise control system
This system is controlled by the ecm, and is activated by
the throttle position sensor and motor. The ecm controls
the following functions: on-off, set / coast,
resume / accel, cancel, vehicle speed operation,
motor ...
Front occupant classification sensor rh circuit malfunction
Description
The front occupant classification sensor rh circuit consists of the occupant
classification ecu and the
front occupant classification sensor rh.
Dtc b1781 is recorded when a malfunction is detected in the front occupant
classification sensor rh
circuit.
Wiring diagram
...
List screen operation
When a list screen is displayed, use the appropriate buttons to
scroll through the list.
How to scroll
Select to scroll to the next
or previous page.
Appears to the right of
titles, the complete titles are
too long for the display. Select
this button to scroll the title.
Turn th ...