DTC P1512: Main Throttle Idle Actuator Malfunction (Mechanical Failure)
Fig. 399: DTC P1512: Main Throttle Idle Actuator Malfunction (Mechanical Failure) - System Wiring Diagram
Courtesy of SUZUKI OF AMERICA CORP.
The aim of the MTIA (Main Throttle Idle Actuator) is to control the idle speed with the throttle body itself. The throttle is motorized for low opening angle (0 , 18 ). The characteristics of the air flow are not the same for low and high opening angles. As a matter of fact, the gradient of the mass air flow function of TPS is lower for small angles that permits to be more precise during the idle speed control. Out of idle speed the throttle is actuated mechanically by a classical accelcable. The DC-motor commands the actuator for idle
Conditions for Setting the DTC
The engine is running.
The MTIA set point is between 0.5 and 21 .
The reference range of MTIA higher than 45% of less than -42% at least 10 seconds.
Mechanical problems exists.
Problem of accel cable hose
problem inside MTIA: seizing by friction, snooted, fouling.
Action Taken When the DTC Sets
The Malfunction Indicator Lamp (MIL) will illuminate.
The ECM will record operating conditions at the time the diagnostic fail. This information will be stored in the Freeze Frame and Failure Records buffers.
A history DTC is stored.
Conditions for Clearing the MIL/DTC
The MIL will turn off at the end of 3 consecutive ignition cycles in which the diagnostic runs without a fault.
A history DTC will clear after 40 warm-up cycles without a fault.
DTC(s) can be cleared by using the scan tool.
An Intermittent problem may be caused by a poor connection, rubbed through wire insulation, or wire that is broken inside the insulation.
Any circuitry, that is suspected as causing the complaint, should be thoroughly checked for the following conditions.
Poor terminal to wire connection
Physical damage to the wiring harness
Thursday, April 22nd, 2010 AT 4:36 AM