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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-648 DTC SET CONDITIONS . Check Conditions • Battery positive voltage is higher than 10.3 volts. • In a few seconds, just after ignition switch is turned to the "ON" position from the Judgment Criteria • The EGR valve motor coil surge voltage (battery positive voltage +2 volts) is not detected for 3 Check Conditions • Battery positive voltage is higher than 10.3 volts. • EGR valve is in operation after the engine start- ing process is complete. Judgment Criteria • The EGR valve motor coil surge voltage (battery positive voltage +2 volts) is not detected for 30 . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Procedure 6 . . TROUBLESHOOTING HINTS (The most • EGR valve (stepper motor) failed. • Open or shorted EGR valve (stepper motor) cir- cuit, harness damage or connector damage. • PCM failed. START END MALFUNCTION GOOD MONITORING CONDITIONS WAS SURGE VOLTAGE (> V B +2V) DETECTED? NO NO YES YES AK204017 |