1G Link won't connect

[Brian Drake]

I followed the no connect on the ecm website. Link connected fine. Parked it for about 2 months then repaired an oil leak on the pump case gasket. After reassambly link won't connect. Continuity between the pin 12 ground is good and pins 1 and 2 don't bleed over and have good continuity to the ecu Harness. I see the heartbeat on pin 1 but I'm reading battery voltage on pin 10. Is there something that could cause this or do I need to seem the ecu back to ecm again.

 

[ErikTande]

Does the check engine light come on for 5-seconds and boost gauge go to zero when ignition switch is moved to ON? Does the car start?

 

[Brian Drake]

Cel comes on 5 seconds and clears and boost guage does center. The car starts for about 1.5 seconds then shuts down like you turned the motor off with the key.

 

[Brian Drake]

Led on my cable blinks when my pc tries to connect. Link reports no response

 

[steve]

I followed the no connect on the ecm website. Link connected fine. Parked it for about 2 months then repaired an oil leak on the pump case gasket. After reassambly link won't connect. Continuity between the pin 12 ground is good and pins 1 and 2 don't bleed over and have good continuity to the ecu Harness. I see the heartbeat on pin 1 but I'm reading battery voltage on pin 10. Is there something that could cause this or do I need to seem the ecu back to ecm again.

Pin 10 on the DLC goes to pin 2 on the ECU and is the mode signal. The ECU pulls it up and we pull it to ground to tell it a logger is connected (or for set BISS mode in conjunction with the set timing connector). Your DSMLink cable should be pulling it low, if it isn't/can't you won't connect to talk to the ECU and you'll just see heartbeat or fault codes on pin 1 of the ECU and DLC.

I don't remember off hand if there is a difference between 90 and 91+ ECU's with regard to what the pull-up voltage is on the pin.

If the car runs for a few seconds the shuts off, you need to see if the CEL is on when it does it and that the fuel pump is running under command from the ECU.

 

[Brian Drake]

Fuel pump is running. No cel when it shuts down. Swapped in a known good 92 turbo ecu non eeprom and my old maf. Starts idles and drives.

 

[steve]

Pretty much points at the ECU or it's tune. Got any current pictures of the ECU board?

 

[Brian Drake]

It looks great. I swapped in a know good 92 turbo ecu and threw the factory maf and injectors back in and turned down to wastegate boost and its back on the road. It's gotta the ecu and I know ecmlink is backlogged like a mother.