Throttle Body Relearn Procedure; Tac System Default Actions/Reduce Power Modes - Suzuki XL7 2007 Service Manual

1C-8 Engine Electrical Devices:

Throttle Body Relearn Procedure

The engine control module (ECM) stores values that
include the lowest possible throttle position (TP) sensor
positions—0 percent, the rest positions—7 percent, and
the return rate of both springs. These values will only be
erased or overwritten if the ECM is reprogrammed or if a
throttle body relearn procedure is performed. Observe, if
the battery is disconnected, the ECM will immediately
perform a throttle body relearn procedure when the
ignition is turned ON.
A throttle body relearn procedure is performed anytime
the ignition is turned ON, with the engine OFF for longer
than 29 seconds when the following conditions have
been met:
• The engine speed is less than 40 RPM.
• The vehicle speed is 0 km/h (0 mph).
• The engine coolant temperature (ECT) is between 5-
85°C (41-185°F).
• The intake air temperature (IAT) is between than 5-
60°C (41-140°F).
• The accelerator pedal position (APP) sensor angle is
less than 14.9 percent.
• The ignition 1 voltage is more than 10 volts.
After 29 seconds, the ECM commands the throttle plate
from the rest position to full closed, then to around 10
percent open. This procedure takes about 6-8 seconds.
If any faults occur in the throttle actuator control (TAC)
system, a DTC sets. At the start of this procedure, the
scan tool TAC Learn Counter parameter should display
0, then count up to 11 after the procedure is completed.
If the counter did not start at 0, or if the counter did not
end at 11, a fault has occurred and a DTC should set.
TAC System Default Actions/Reduce Power
Modes
There are 2 reduce power modes that the engine control
module (ECM) can default to if an error is detected in the
throttle actuator control (TAC) system. If an accelerator
pedal position (APP) sensor 1 or APP sensor 2 circuit
fault, throttle position (TP) sensor 2 circuit fault, or if a TP
sensor 1 circuit fault is detected with some APP angle,
the ECM goes into one of the 2 reduce power modes. In
this mode, the engine torque is limited so that the vehicle
cannot reach speeds of more than 100 km/h (60 mph).
The ECM remains in this reduce power mode during the
entire ignition cycle even if the fault is corrected.
If there is a condition with the throttle actuator control
circuits, throttle actuator command vs actual position
fault, return spring check fault, or a TP sensor 1 circuit
fault, the ECM goes into the other reduce engine power
mode. In this mode, the engine speed is limited to 2,500
RPM and the 3-6 fuel injectors are randomly turned OFF.
At this time the Reduced Power indicator is commanded
ON. The ECM remains in the reduce power mode during
the entire ignition cycle even if the fault is corrected.
Observe, if a TP sensor 1 or throttle actuator control
circuit fault is present at the time the vehicle is at idle,
with no accelerator pedal angle, the engine may stall.