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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-553 STEP 3. Using scan tool MB991958, read the diagnostic YES : Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, ID Code or GROUP 42C, ID Codes Registration Judgment Table <Vehicles with WCM> NO : The inspection is complete. DTC P0638: Throttle Actuator Control Motor Circuit Range/Performance . 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. between 0.2 and 4.8 volts. • Drop of throttle position sensor (main) output volt- age per 100 milliseconds is 0.04 volt or more. 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. 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. between 0.2 and 4.8 volts. Judgement Criterion • Difference between throttle position sensor (main) output voltage and target throttle position |