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MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-101 CIRCUIT OPERATION • A 5-volt power supply is applied on the TPS • When the throttle valve shaft is turned from the TECHNICAL DESCRIPTION • The TPS outputs voltage which corresponds to • The PCM checks whether the voltage is within a DTC SET CONDITIONS Check Conditions • Two seconds or more have passed since the • Engine speed is lower than 3,000 r/min. • Volumetric efficiency is lower than 30 percent. Judgement Criteria • TPS output voltage has continued to be 4.6 volts TROUBLESHOOTING HINTS (The most likely • TPS failed or maladjusted. • Open or shorted TPS circuit, or loose connector. • PCM failed. DIAGNOSIS Required Special Tools STEP 1. Using scan tool MB991502, check data list item 14: CAUTION To prevent damage to scan tool MB991502, always turn the 14, Throttle Position Sensor. • With the throttle valve in the idle position, voltage should • With the throttle valve in the full-open position, voltage (4) Turn the ignition switch to the "LOCK"(OFF) position. Q: Is the sensor operating properly? YES : It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/ ). NO : Go to Step 2. ACX02484 AH THROTTLE CONNECTOR:B-05 AK000280 CONNECTORS : C-40, C-41 C-41 C-40 PCM AX AC003081 AB 16 PIN MB991502 |