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Fuel cut during immobilizer system activation
Purpose
• To prevent vehicle theft
Execution conditions
• When an engine stop request signal is received from the immobilizer system, the PCM force-stops the fuel
injectors. Therefore the engine stops.
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FUEL PUMP CONTROL OUTLINE [LF]
• The fuel pump is operated when the ignition switch is turned to the ON position to improve startability. As a
result, fuel pressure increases rapidly and stable fuel control is performed.
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FUEL PUMP CONTROL BLOCK DIAGRAM [LF]
CKP SENSOR
IGNITION SWITCH
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FUEL PUMP CONTROL OPERATION [LF]
Operation Condition
• When the ignition switch is turned to the ON position, the PCM turns the fuel pump relay on for 1 s, then off.
• When it is detected that the CKP sensor signal rises during cranking, the fuel pump relay turns on.
• When the engine is stopped, the fuel pump relay turns off.
Operation Inhibition Condition
• When receiving an engine stop request signal from the immobilizer system, the PCM force-stops control of the
fuel injectors. As a result, the engine does not start.
ENGINE STOP REQUEST SIGNAL RECEIVED
FROM MAIN RELAY FROM BATTERY
PCM
FUEL PUMP
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ELECTRONIC SPARK ADVANCE (ESA) CONTROL OUTLINE [LF]
• Controls ignition to optimum timing according to engine operation conditions.
• Serviceability has been improved by eliminating the necessity of ignition timing.
• The PCM determines the engine operation conditions based on input signals from sensors, blocks current to
the ignition coils by the calculated ignition timing, and discharges (ignition) the sparks plugs based on the effect
of electromagnetic mutual induction.
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01–40–24
CONTROL SYSTEM
PCM
ENGINE STOP REQUEST SIGNAL
NOT RECEIVED
FUEL PUMP RELAY
M
FUEL PUMP RELAY
FROM MAIN RELAY FROM BATTERY
PCM
FUEL PUMP
E5U014000000N28
E5U014000000N29
E5U140ZW5401
E5U014000000N30
FUEL PUMP RELAY
M
C3U0140S017
E5U014000000N31
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