DTC 41

TROUBLESHOOTING PROCEDURES





CIRCUIT DIAGRAM








NOTE:
*1: The injector drive time refers to when the supply voltage is 11 V and the cranking speed is less than 250 rpm.
*2: When coolant temperature is lower than 0°C (32°F), injection is made by 6 cylinders simultaneously.
*3: When the vehicle is new [within initial operation of about 500 km (300 miles)], the injector drive time may be about 10% longer.














INSPECTION USING SCAN TOOL

















HARNESS INSPECTION PROCEDURE

USING OSCILLOSCOPE
(1) Run the engine at idle speed.





(2) Connect the probe to the oscilloscope pick-up point as shown in the circuit diagram, and check the waveform at the drive side of each injector.

TROUBLESHOOTING HINTS
Hint 1: If the engine is hard to start when hot, check fuel pressure and check the injector for leaks.
Hint 2: If the injector does not operate when the engine that is hard to start is cranked, the following as well as the injector itself may be responsible.
(1) Faulty power supply circuit to the engine control unit, faulty ground circuit
(2) Faulty MFI relay
(3) Faulty crankshaft position sensor, camshaft position sensor
Hint 3: If there is any cylinder whose idle state remains unchanged when the fuel injection of injectors is cut one after another during idling, make following checks about such cylinder.
(1) Injector and harness check
(2) Ignition plug and high tension cable check
(3) Compression pressure check
Hint 4: If the injector harness and individual part checked good but the injector drive time is out of specification, the following troubles are suspected.
(1) Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
(2) Loose EGR valve seating
(3) High engine resistance

ACTUATOR INSPECTION
Measurement of Resistance between Front Bank Terminals
(1) Remove the injector connector.





(2) Measure the resistance between terminals.

Standard value: 2 - 3 Ohms [at 2O°C (68°F)]
(3) Install the injector connector.

Measurement of Resistance between Rear Bank Terminals





(1) Remove the injector connector.
(2) Measure the resistance between terminals.

Standard value: 2 - 3 Ohms [at 2O°C (68°F)]

(3) Install the injector connector.

INJECTOR RESISTOR
Measurement of Resistance between Terminals
(1) Disconnect the resistor connector.





(2) Measure the resistance between terminals.





(3) If the resistance is out of specification, replace the resistor.