MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MFI) <2.4L>
STEP 3. Check the circuit at PCM connector C-41.
(2) Turn the ignition switch to the "ON" position.
Voltage should be 1 volt or less when the A/C switch is
Voltage should be battery positive voltage when the A/C
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Replace the PCM. Then confirm that the malfunction
symptom is eliminated.
NO : Refer to GROUP 55, Heating and air conditioning
Introduction To Heater, Air Conditioning And
DATA LIST REFERENCE TABLE
When shifting the select lever to D range, the brakes should be applied so that the vehicle does
Driving tests always need two persons: one driver and one observer.
: If the idle speed is lower than the standard value on a very cold engine (approximately -20
F) even when the IAC motor is fully opened, the air volume limiter built in the throttle body could be defective.
: In a new vehicle [driven approximately 500 km (311 mile) or less], the step of the stepper motor is
sometimes 30 steps greater than the standard value.
: The injector drive time represents the time when the cranking speed is at 250 r/min or below when
the power supply voltage is 11 volts.
: In a new vehicle [driven approximately 500 km (311 mile) or less], the injector drive time is
sometimes 10% longer than the standard time.
: In a new vehicle [driven approximately 500 km (311 mile) or less], the volume air flow sensor
output frequency is sometimes 10% higher than the standard frequency.
: Applicable to General Scan Tool (GST).