Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Check battery voltage

  2. Check whether engine will crank

  3. Check whether engine starts

  4. Check air filter

  5. Check idling speed

  6. Check fuel pressure

  7. Check for spark


When the malfunction is not confirmed by the DTC check, troubleshooting should be carried out in all circuits considered to be possible causes of the problem. In many cases, by carrying out the basic engine check shown in the following flowchart, the location of the problem can be found quickly and efficiently. Therefore, using this check is essential when engine troubleshooting.

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1.CHECK BATTERY VOLTAGE
  1. NOTICE:
  2. Conduct this check with the engine stopped and ignition switch off.
  3. Result
    		Proceed To
    11 V or more
    		OK
    Below 11 V
    		NG


NG.next
CHARGE OR REPLACE BATTERY
OK
next down

2.CHECK WHETHER ENGINE WILL CRANK


    		NG.next
    		PROCEED TO PROBLEM SYMPTOMS TABLE ON PAGE
    OK
    next down

    3.CHECK WHETHER ENGINE STARTS


      		NG.next
      		GO TO STEP 6
      OK
      next down

      4.CHECK AIR FILTER

      1. Visually check that the air filter is not excessively contaminated with dirt or oil.



      		NG.next
      		REPLACE AIR FILTER
      OK
      next down

      5.CHECK IDLING SPEED


        		NG.next
        		TROUBLESHOOT IDLING SPEED AND PROCEED TO NEXT STEP
        OK
        next down

        6.CHECK FUEL PRESSURE


          		NG.next
          		TROUBLESHOOT FUEL PRESSURE AND PROCEED TO NEXT STEP
          OK
          next down

          7.CHECK FOR SPARK


            		NG.next
            		TROUBLESHOOT SPARK AND PROCEED TO NEXT STEP
            OK
            next down
            PROCEED TO PROBLEM SYMPTOMS TABLE