Toyota Celica, Corolla, ECHO & MR2 1999-05

Fuel Injectors 2

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Testing



Off-Vehicle Inspection
Check Leakage Rate
  1. Leaving everything as it was from the injection test, disconnect the service tool test probes from the battery.
  2.  
  3. Check the injector tip for leakage for a period of one minute. An acceptable leakage rate is one drop.
  4.  
  5. If the leakage exceeds this amount, replace the injector.
  6.  
  7. Disconnect the negative battery cable and remove the all the test equipment.
  8.  
  9. Install the injector(s).
  10.  

Injector Volume Test

CAUTION
To avoid personal injury, do NOT smoke or use any type of open flame when testing the injectors!

  1. Remove the injector(s) from the vehicle and set aside (See Fuel Injectors).
  2.  



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Fig. Hose placement for the injector volume testing

  1. Place a rag under the "banjo" fitting and, disconnect the fuel hose from the fuel filter outlet. Remove the gaskets and replace them with new ones.
  2.  
  3. Connect SST No. 09628-41045 (union and hose) to the fuel filter outlet connection with the new gaskets and tighten the union bolt.
  4.  



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Fig. Placement of the union and hose at the fuel filter outlet

  1. Remove the fuel pressure regulator.
  2.  
  3. Connect the fuel return hose to the pressure regulator with the service union with a set of new gaskets and tighten the union bolt.
  4.  



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Fig. Placement of the SST on the pressure regulator

  1. Install a new O-ring onto injector.
  2.  
  3. Connect the special service tool (union and hose) to the injector, and hold the injector and union with the clamp.
  4.  



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Fig. Placement of the clamp and union at the injector when testing the volume of fuel

  1. Connect a length of rubber or vinyl hose to the injector tip to prevent fuel splashing and overspray.
  2.  
  3. Place the injector into a graduated cylinder with metric increments.
  4.  
  5. With a jumper wire, short the +B and FP terminals of the check connector.
  6.  



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Fig. Place the jumper wire on the DLC1 terminal locations as shown for the volume test

  1. Reconnect the negative battery cable.
  2.  
  3. Turn the ignition switch ON , but Do NOT start the engine.
  4.  



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Fig. Turn the ignition switch to the ON position, but do NOT start it

  1. Connect SST No. 09842-30070 (wire) to the injector and battery for 15 seconds.
  2.  



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Fig. Attaching the wire to the injector and battery to measure the injection volume

  1. Measure the volume injected into the cylinder during the 15 second period. The volume should be:

    3.0-3.6 cu. inch (49-59cc)-5S-FE engine
     
    2.4-3.1 cu inch. (40-50cc)-7A-FE engine
     

  2.  

Test each injector two or three times.



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Fig. The flow of fuel from the injector may differ slightly on some models

  1. If all four injectors were tested, there should be no less than 0.3 cu. in. (5cc) difference between each injector. If the actual volume does not agree with the specified volume, replace the injector.
  2.  

On-Vehicle Inspection
Check Injector Operations
  1. Start the engine.
  2.  
  3. Position the probe of a technicians stethoscope (or finger tip) under the base of the injector connector and have an assistant alternately increase the engine rpm and return it to idle.
  4.  



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Fig. Place a sound scope under the base of the injector connector to test the operation



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Fig. A finger can be used in place of a sound scope if necessary

  1. Listen or feel for a change in the operating sound of the injector. The change should be proportional to the increase in engine rpm.
  2.  
  3. If no sound is heard or if the injector sound is unusual, check the connector wiring, injector, resistor or the signal from the ECU.
  4.  

Check Injector Resistance

Disconnect the connector from the injector. With an ohmmeter, measure the resistance between the injector terminals. The resistance should be approximately 13.4-14.2 ohms. If the resistance is not as specified, replace the injector. Reconnect the injector connector.



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Fig. Testing the fuel injector terminals for continuity using an ohmmeter



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Fig. Using an ohmmeter, test the injector resistance between terminals

 
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