Description
The etcs (electronic throttle control system) has a dedicated power supply circuit. The voltage (+bm) is monitored and when it is low (less than 4 v), the ecm determines that there is a malfunction in the etcs and cuts off the current to the throttle actuator.
When the voltage becomes unstable, the etcs itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the ignition switch off. The ecm then allows the current to flow to the throttle actuator so that it can be restarted.
Hint:
The etcs does not use a throttle cable.
Monitor description
The ecm monitors the battery supply voltage applied to the throttle actuator.
When the power supply voltage (+bm) drops below 4 v for 0.8 Seconds or more, the ecm interprets this as an open in the power supply circuit (+bm). The ecm illuminates the mil and sets the dtc.
If the malfunction is not repaired successfully, the dtc is set 5 seconds after the engine is next started.
Monitor strategy
Typical enabling conditions
Typical malfunction thresholds
Component operating range
Fail-safe
When this dtc, or other dtcs relating to etcs (electronic throttle control system) malfunctions, are 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.
Wiring diagram
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.
Standard voltage: 9 to 14 v
Standard resistance:
below
Standard resistance (check for open)
Standard resistance (check for short)
Standard resistance (check for open)
Standard resistance (check for short)
Standard voltage
Ok: battery is not depleted
Ok: battery terminals and ecm ground are not loose or corroded
How to proceed with troubleshooting
Hint:
Use these procedures to troubleshoot the key reminder
warning system.
*: Use the intelligent tester.
Vehicle brought to workshop
Inspect battery voltage
Standard voltage:
11 to 14 v
Hint:
If the voltage is below 11 v, recharge or replace the battery
before proceedi ...
Vehicle speed sensor "A"
description
The speed sensor detects the wheel speed and sends the appropriate signals to
the skid control ecu.
The skid control ecu converts these wheel speed signals into a 4-pulse signal
and outputs it to the ecm
via the combination meter. The ecm determines the vehicle speed based o ...
Diagnostic trouble code chart
Hint:
If any dtcs are displayed during the dtc check, inspect the
circuit listed for these dtcs. For details of each dtc, refer to
the page indicated in the dtc chart.
Hint:
: Warning
light comes on
X: warning light turns off (normal reset) ...