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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-571 DTC P0638: Throttle Actuator Control Motor Circuit Range/Performance Problem . THROTTLE ACTUATOR CONTROL • Refer to DTC P2101 − Throttle Actuator Control Motor Magneto Malfunction . . CIRCUIT OPERATION • Refer to DTC P2101 − Throttle Actuator Control Motor Magneto Malfunction . . TECHNICAL DESCRIPTION • ECM checks the electronic controlled throttle sys- tem for abnormal conditions. . DESCRIPTIONS OF MONITOR METHODS Difference between throttle position sensor (main) output and target opening is greater than the . MONITOR EXECUTION Continuous . MONITOR EXECUTION CONDITIONS Other Monitor (There is no temporary DTC stored in memory for the item monitored below) • Not applicable Sensor (The sensor below is determined to be normal) • Not applicable . DTC SET CONDITIONS Check Conditions • Battery positive voltage is higher than 8.3 volts. • Throttle position sensor (main) output voltage is between 0.2 and 4.8 volts. • Drop of throttle position sensor (main) output volt- age per 100 milliseconds is more than 0.04 volt. Judgement Criterion • Throttle position sensor (main) output voltage has continued to be higher than the target throttle Check Conditions • Battery positive voltage is higher than 8.3 volts. • Throttle position sensor (main) output voltage is between 0.2 and 4.8 volts. • Target throttle position sensor (main) output volt- age is 1.5 volts or lower. Judgement Criterion • Difference between throttle position sensor (main) output voltage and target throttle position Check Conditions • Battery positive voltage is higher than 8.3 volts. • Throttle position sensor (main) output voltage is between 0.2 and 4.8 volts. Judgement Criterion • Difference between throttle position sensor (main) output voltage and target throttle position Check Condition • Battery positive voltage is higher than 8.3 volts. Judgement Criterion • Throttle position sensor (main) default opening learnt value is higher than 4 volts. . OBD-II DRIVE CYCLE PATTERN None. . TROUBLESHOOTING HINTS (The most • Throttle valve return spring failed. • Throttle valve operation failed. • Throttle actuator control motor failed. • Throttle actuator control motor circuit harness damage, or connector damage. • ECM failed. |