ALDL and accessing ECM error codes>>> - ZR-1 Net Registry Forums

ZR1Vette · 02-08-2009

After doing the plenum pull/replace injectors etc etc and all is back together and running, 'Service Engine' light remains on...not unexpected so decided to access error [trouble] codes using the protocol the Marc H and Jeffvette both describe. First thing I notice is the ALDL plug is not configured as shown from Marc's document 'The '90-93 ALDL Connector>>

Here is the ALDL plug from my MY 90 ZR...note pins E and D are missing and in the first picture F and C pins are not explained

No E & D pins normal? and what are F & C pins for?

Now the results.. got only one code>> 33 code 'MAP sensor signal voltage was too high (low vacuum) for 0.5 seconds when throttle opening was under 3%'

Any comments on this...expected after doing a plenum pull? Or is something else amiss.

Finally, how do you clear the 'Service Engine' light (stays on after engine starts..will say is still on the lift so not running as if on the road)??

Again...always appreciate any help

02-08-2009	#1
ZR1Vette Join Date: Dec 2007 Location: Reston, Virginia Posts: 939	ALDL and accessing ECM error codes>>> After doing the plenum pull/replace injectors etc etc and all is back together and running, 'Service Engine' light remains on...not unexpected so decided to access error [trouble] codes using the protocol the Marc H and Jeffvette both describe. First thing I notice is the ALDL plug is not configured as shown from Marc's document 'The '90-93 ALDL Connector>> Here is the ALDL plug from my MY 90 ZR...note pins E and D are missing and in the first picture F and C pins are not explained No E & D pins normal? and what are F & C pins for? Now the results.. got only one code>> 33 code 'MAP sensor signal voltage was too high (low vacuum) for 0.5 seconds when throttle opening was under 3%' Any comments on this...expected after doing a plenum pull? Or is something else amiss. Finally, how do you clear the 'Service Engine' light (stays on after engine starts..will say is still on the lift so not running as if on the road)?? Again...always appreciate any help __________________ Michael :cheers: [I][SIZE="2"]1990 RED on RED #566[/SIZE][/I] [I][SIZE="2"]WAZOO MEMBER[/I][/SIZE]