The test harness is not required. It just makes many measuring tasks easier.

For measurements with the ECU disconnected you can measure at the ECU harness connector. Just be careful not to damage the terminal sockets by jamming too large of a test probe in the socket.

When the measurement is made with the ECU connected you can back porbe the connector. A straightened out paper clip makes a good probe that you can slide into the back of the connector next to the wire of interest. It may take a little wiggling to get the probe in good contact with the terminal.

Mike

 

Or just get a set of backprobes... http://www.amazon.com/gp/product/B006WZ ... g=l4m3r-20

 

I've ordered a set. Dont know how I did all those years without this gems! Thx for the tip

 

I always used a sewing needle to backprobe. Never let me down yet

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