P.13A-6 - LIL EVO

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13A-30MULTIPORT FUEL INJECTION (MFI)MULTIPORT FUEL INJECTION (MFI) DIAGNOSISDIAGNOSTIC TROUBLE CODE PROCEDURESDTC P0090: FUEL PRESSURE SOLENOID CIRCUITFuel Pressure Solenoid CircuitBATTERYBLACK-YELLOWB-12XBLACK-YELLOWBLACK-YELLOW1 21 23 4OFFONMFIRELAY43B-28(MU802722)1 2RED-YELLOW1FUEL PRESSURE SOLENOID2C-121(MU801824)WHITE-BLACK31 2 3 4 5 6 7 8 9 10 11 12 1314 15 16 17 18 19 20 21 22 23 24 25 26ENGINE CONTROLMODULE (ECM)AK203463CONNECTOR: B-28FUEL PRESSURESOLENOIDCONNECTOR: C-121ECMB-28 (B)C-121 (Y)AK203486ABAK203487ABTSB Revision
MULTIPORT FUEL INJECTION (MFI)13A-31MULTIPORT FUEL INJECTION (MFI) DIAGNOSISCONNECTOR: B-12XMFI RELAYAK203489AB.CIRCUIT OPERATION• The fuel pressure solenoid power is suppliedfrom the MFI relay (terminal No. 4).• The ECM controls the fuel pressure solenoidground by turning the power transistor in theECM "ON" and "OFF"..TECHNICAL DESCRIPTION• To judge if there is open circuit in the fuel pressuresolenoid drive circuit, ECM measures thesurge voltage of the fuel pressure solenoid coil.• The ECM drives the fuel pressure solenoid. Afterthe solenoid is turned off, the ECM will check ifthe solenoid coil produces a surge voltage of 2volts or more..DTC SET CONDITIONSCheck Conditions• Engine is being cranked.• Battery positive voltage is at between 10 and 16volts.DIAGNOSISJudgment Criteria• The fuel pressure solenoid coil surge voltage(battery positive voltage + 2 volts) is not detectedfor 0.2 second.• The ECM monitors for this condition once duringthe drive cycle.Check Conditions• Battery positive voltage is at between 10 and 16volts.• Fuel pressure solenoid is ON.• Turbocharger wastegate solenoid is OFF.• More than 1 second has elapsed after the abovementioned conditions have been met.Judgment Criteria• The fuel pressure solenoid coil surge voltage(battery positive voltage + 2 volts) is not detectedfor 1 second. When the fuel pressure solenoid isturned OFF..TROUBLESHOOTING HINTS (The most likelycauses for this code to be set are:)• Fuel pressure solenoid failed.• Open or shorted fuel pressure solenoid circuit,harness damage, or connector damage.• ECM failed.Required Special Tools:• MB991502: Scan Tool (MUT-II)• MB991958: Scan Tool (MUT-III Sub Assembly)• MB991824: V.C.I.• MB991827: USB Cable• MB991911: Main Harness BTSB Revision
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P.13A-6 - LIL EVO

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