sonicselli
Proven Member
- 79
- 5
- Aug 15, 2015
-
Lowell,
Michigan
Sorry for yet another post on ISC's.
I'm having a serious idle surge problem. The idle will rev to (1500+) and drop below (1000) and repeat. I have changed a lot on the car since last year but before I post about whats changed I want to talk about my findings...
I pulled off the ISC to inspect it. Measuring resistance on the coils I got about 38ohms for each. Plugged into the car to see if the plunger even operates as it should and no it doesn't.... What many others experience claiming that it clicks and seems like it isn't receiving enough power... Same deal for me! I understand its a stepper motor so it is stepping once and not continuing its cycle to extract the plunger. Manually hooked up power to the ISC and I verified it does work. Okay so testing the connector making sure the ISC is even getting power I found on the center two pins are receiving voltage. The others are throwing me off... I'm testing for continuity on the pins to the chassis. I get some resistance on 2 of them. Then one will show some really low voltage(weird, thought only center 2 get voltage. or my multimeter is crazy) and the other has nothing......
I'm getting closer! I was kind of harsh on the ISC connector because it barely reaches to the ISC so there is potential for a broken connection. I looked at the back of the plug and it seemed alright.
I pulled the ecu and visually inspected the board and drivers. The ecu looks perfect. I know looks aren't everything so I was wondering if there is anyway to actually test the drivers or what my next step should be? I could measure the pin going from my dead connection on the connector to the ecu connector... hmm be right back!
Thank you for your help in advance!
I'm having a serious idle surge problem. The idle will rev to (1500+) and drop below (1000) and repeat. I have changed a lot on the car since last year but before I post about whats changed I want to talk about my findings...
I pulled off the ISC to inspect it. Measuring resistance on the coils I got about 38ohms for each. Plugged into the car to see if the plunger even operates as it should and no it doesn't.... What many others experience claiming that it clicks and seems like it isn't receiving enough power... Same deal for me! I understand its a stepper motor so it is stepping once and not continuing its cycle to extract the plunger. Manually hooked up power to the ISC and I verified it does work. Okay so testing the connector making sure the ISC is even getting power I found on the center two pins are receiving voltage. The others are throwing me off... I'm testing for continuity on the pins to the chassis. I get some resistance on 2 of them. Then one will show some really low voltage(weird, thought only center 2 get voltage. or my multimeter is crazy) and the other has nothing......
I'm getting closer! I was kind of harsh on the ISC connector because it barely reaches to the ISC so there is potential for a broken connection. I looked at the back of the plug and it seemed alright.
I pulled the ecu and visually inspected the board and drivers. The ecu looks perfect. I know looks aren't everything so I was wondering if there is anyway to actually test the drivers or what my next step should be? I could measure the pin going from my dead connection on the connector to the ecu connector... hmm be right back!
Thank you for your help in advance!