'165 ecm question
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
'165 ecm question
When you hook up the ALDL cable to your '165 ecm and watch your data/codes, etc. with either a scantook or a pc, does your car go into diagnostic mode, aka. idle raises to 1100rpms and doesn't go into closed-loop mode?
I know the '870 seems to do this, but I am wondering if the '165 does this also?
Thanks in advance.
I know the '870 seems to do this, but I am wondering if the '165 does this also?
Thanks in advance.
Instructor
Joined: Jul 2004
Posts: 137
Likes: 0
From: CT
I think it's a function of the cable rather than software -- if it (or you) applies a 10K resistor between ALCL pins A & B then you go into the diagnostic mode and it's also described this way in Helms. I've been able to get only WinALDL to work at 160 baud on my '86 (with original '165 ECM and upgraded '259) only with the 10K resistor in place. Moates tells ya to connect the 10k resistor so I don't know how it keeps from gong into diagnostic mode. Don't know if software can subsequently get the ECM out of diagnostic mode with the 10K connected and I'm planning on continuing to try Moates, Datamaster, etc. -- It'd be great to be able to scan without going into diagnostic mode (and at 8192 baud) since timing is at full advance so lots of pinging. 
Have a similar question on Scan and Tune and I'm sure somebody has this mojo. 
Have a similar question on Scan and Tune and I'm sure somebody has this mojo.
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 6,341
Likes: 1
From: Shelton CT
Originally Posted by 1986Z51
I think it's a function of the cable rather than software -- if it (or you) applies a 10K resistor between ALCL pins A & B then you go into the diagnostic mode and it's also described this way in Helms. I've been able to get only WinALDL to work at 160 baud on my '86 (with original '165 ECM and upgraded '259) only with the 10K resistor in place. Moates tells ya to connect the 10k resistor so I don't know how it keeps from gong into diagnostic mode. Don't know if software can subsequently get the ECM out of diagnostic mode with the 10K connected and I'm planning on continuing to try Moates, Datamaster, etc. -- It'd be great to be able to scan without going into diagnostic mode (and at 8192 baud) since timing is at full advance so lots of pinging. Have a similar question on Scan and Tune and I'm sure somebody has this mojo.
Have a similar question on Scan and Tune and I'm sure somebody has this mojo.
Instructor
Joined: Jul 2004
Posts: 137
Likes: 0
From: CT
So, is it even possible to do datalogging under normal operation with a '165 ECM? Anyone? I'm thinking there might be software (perhaps in conjunction with a special cable) that doesn't rely on the 10K resistor. There appears to be *data* on ALCL Pin E even without the 10K resistor in place from the perspective of WinALDL and Moates which seem to indicate hex values being received but the software doesn't treat the data as valid. 
