I tried to read the trouble codes on my 93 400e from the 38 pin connector with a blink code reader , but I only get a response ( a single blink , or a counted code ) from pins 31 ,32 , and 33 this is done straight into the 38 pin connector not using a 38 pin break out box , is a breakout box needed ? Am I doing this the wrong way ? The 400e idles low at times .