2007 sedan fuel pump not running and check engine light - Toyota Yaris Forums

Gander · 10-26-2014, 09:13 AM

I just stumbled up this thread as my wife's car is showing the same symptoms - cranks and doesn't start. I followed the instructions above and got the following:

Testing the coil of the c/opn relay on pins 4B-9 and 4E-5 with the ignition off got a resistance of 170ohms.

Checking across pins 4A-8 and 4B-11 with the ignition in the ON postion I found the voltage to be 0. If checking the same pins individually with the multimeter grounded on the chassis I found 12v at both pins.

I then shorted the 4A-8 and 4B-11 and when trying to start I could smell unburned fuel coming from the exhaust but it still wouldn't start.

Do you think I'm looking at a faulty ECM and do I read right that the relay is integral to is and cannot be replaced without replacing the ECM itself? If this is the case where would I find it to get a part number or can it be found from the VIN?

Many thanks for any help you can provide :-)

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10-26-2014, 09:13 AM	#17
Gander I've made a post! Drives: 2009 Yaris VVTi Join Date: Oct 2014 Location: UK Posts: 1	I just stumbled up this thread as my wife's car is showing the same symptoms - cranks and doesn't start. I followed the instructions above and got the following: Testing the coil of the c/opn relay on pins 4B-9 and 4E-5 with the ignition off got a resistance of 170ohms. Checking across pins 4A-8 and 4B-11 with the ignition in the ON postion I found the voltage to be 0. If checking the same pins individually with the multimeter grounded on the chassis I found 12v at both pins. I then shorted the 4A-8 and 4B-11 and when trying to start I could smell unburned fuel coming from the exhaust but it still wouldn't start. Do you think I'm looking at a faulty ECM and do I read right that the relay is integral to is and cannot be replaced without replacing the ECM itself? If this is the case where would I find it to get a part number or can it be found from the VIN? Many thanks for any help you can provide :-)