HELP PLEEEASE!!! my yaris starts whenever I step on the clutch pedal.

[CTScott]

Originally Posted by trini_per4mance

I actually never took my Yaris back to the dealer to have them do anything on it. Remember I ran out of warranty only after 3 months of buying the the car. I only know everyone at the dealer b'cuz of my high miles everyone knows my car and always look out for me every time I visit the parts dept, from managers to salesmen to technicians. I'm the only person that works on my car. I actually bought a new relay myself and replaced it myself and the problem still exists.

What's the part number of the relay you have in there now (just to verify that it is the correct relay)?

From there I would check the following:

1. Ignition Switch - Remove the connector from the key switch and with the key off, check continuity between pin 5 (where the gray wire connects to) and pin 7 (where the black wire connects to). Then, move the key to each position and recheck. There should only be continuity between those two pins when the key is held in the start position.


2. While you have that connector off, on the harness side, measure the voltage between the gray wire and the black wire. It should read 12V. If it reads 0V, then there is a short in the wiring. If it reads more than zero, but less than one volt, then the automatic cranking circuit in the ECM is bad. This is the circuit that allows you to just bump the key and then the starter cranks by itself until the car starts. If that is the issue, you can do either of two things - Replace the ECM, or simply eliminate the "bump" starting (which you can do by cutting one wire in the under hood fuse box).

[trini_per4mance]

Originally Posted by CTScott

What's the part number of the relay you have in there now (just to verify that it is the correct relay)?

From there I would check the following:

1. Ignition Switch - Remove the connector from the key switch and with the key off, check continuity between pin 5 (where the gray wire connects to) and pin 7 (where the black wire connects to). Then, move the key to each position and recheck. There should only be continuity between those two pins when the key is held in the start position.


2. While you have that connector off, on the harness side, measure the voltage between the gray wire and the black wire. It should read 12V. If it reads 0V, then there is a short in the wiring. If it reads more than zero, but less than one volt, then the automatic cranking circuit in the ECM is bad. This is the circuit that allows you to just bump the key and then the starter cranks by itself until the car starts. If that is the issue, you can do either of two things - Replace the ECM, or simply eliminate the "bump" starting (which you can do by cutting one wire in the under hood fuse box).

I'll definitely try this. I'll let u know how it works out. Thanx!

[elcam84]

Originally Posted by CTScott

What's the part number of the relay you have in there now (just to verify that it is the correct relay)?

From there I would check the following:

1. Ignition Switch - Remove the connector from the key switch and with the key off, check continuity between pin 5 (where the gray wire connects to) and pin 7 (where the black wire connects to). Then, move the key to each position and recheck. There should only be continuity between those two pins when the key is held in the start position.


2. While you have that connector off, on the harness side, measure the voltage between the gray wire and the black wire. It should read 12V. If it reads 0V, then there is a short in the wiring. If it reads more than zero, but less than one volt, then the automatic cranking circuit in the ECM is bad. This is the circuit that allows you to just bump the key and then the starter cranks by itself until the car starts. If that is the issue, you can do either of two things - Replace the ECM, or simply eliminate the "bump" starting (which you can do by cutting one wire in the under hood fuse box).

Stepdaughters 08 yaris has started the same symptoms when it's hot. Relay ign switch are good.
Which wire feeds the start relay from the ECM. Need to get it drivable then get a ECM and have it programmed later on.

Thanks

[CTScott]

Originally Posted by elcam84

Stepdaughters 08 yaris has started the same symptoms when it's hot. Relay ign switch are good.
Which wire feeds the start relay from the ECM. Need to get it drivable then get a ECM and have it programmed later on.

Thanks

The orange wire in pin 52 of the ECM connector C20 (the larger connector).

Pin 52 is located on the row closest to the center of the connector, on the side where many of the pins are unpopulated.

Connector C20.jpg

[elcam84]

Originally Posted by CTScott

The orange wire in pin 52 of the ECM connector C20 (the larger connector).

Pin 52 is located on the row closest to the center of the connector, on the side where many of the pins are unpopulated.

Attachment 51818

Thanks for the quick reply. Will work on it in the morning when it's cooler. Still 96* here. Does that wire run to one of the white connectors that plug into the fuse box as there are two orange ones there. Unfortunately I don't have a wiring diagram for the car.

[CTScott]

Originally Posted by elcam84

Thanks for the quick reply. Will work on it in the morning when it's cooler. Still 96* here. Does that wire run to one of the white connectors that plug into the fuse box as there are two orange ones there. Unfortunately I don't have a wiring diagram for the car.

It does indeed. Connector CA1 is the one that is lifted in this picture and the orange wire between the brown and red is the orange one of interest.

Starter Wire CA1-8.jpg