code 41
Thread Starter
Cruising
Joined: Jun 2015
Posts: 14
Likes: 0
From: Monroe, North Carolina
code 41
I have a 91 L98. I have a code 41 and no start problem. I bought a remanufactured ECM and a new distributor. the engine will start with starting on startup fluid. Also no fuel for 2 seconds. new fuel pump and all relays checked ok. Is this an ECM problem or something else?
Drifting
Joined: Apr 2020
Posts: 1,925
Likes: 609
From: Orange, CA
Code 41 what? When you run codes, a module number is provided. Module 1 is CCM, Module 4 is ECM, Module 9 is ABS. Which module reported 41?
Did the remanufactured ECM come with a MEMCAL? If not, did you make sure to put your old MEMCAL into the new ECM? Just covering the simple stuff.
Did the remanufactured ECM come with a MEMCAL? If not, did you make sure to put your old MEMCAL into the new ECM? Just covering the simple stuff.
Pro
Joined: Feb 2009
Posts: 655
Likes: 164
From: Vancouver Washington
My 86 FSM states:
Ignition off
Disconnect ECM connections
Probe terminal D1, D3, D10, A12 with a test light connected to 12 volts
Light on = faulty connections or faulty mem-cal
Light off = repair open ground at circuit 450
A12, D1, D3, D10 are all circuit 450 which is ground for ECM and other items
Hope this helps
Ignition off
Disconnect ECM connections
Probe terminal D1, D3, D10, A12 with a test light connected to 12 volts
Light on = faulty connections or faulty mem-cal
Light off = repair open ground at circuit 450
A12, D1, D3, D10 are all circuit 450 which is ground for ECM and other items
Hope this helps
Drifting
Joined: Apr 2020
Posts: 1,925
Likes: 609
From: Orange, CA
My 86 FSM states:
Ignition off
Disconnect ECM connections
Probe terminal D1, D3, D10, A12 with a test light connected to 12 volts
Light on = faulty connections or faulty mem-cal
Light off = repair open ground at circuit 450
A12, D1, D3, D10 are all circuit 450 which is ground for ECM and other items
Hope this helps
Ignition off
Disconnect ECM connections
Probe terminal D1, D3, D10, A12 with a test light connected to 12 volts
Light on = faulty connections or faulty mem-cal
Light off = repair open ground at circuit 450
A12, D1, D3, D10 are all circuit 450 which is ground for ECM and other items
Hope this helps
Pro
Joined: Aug 2020
Posts: 646
Likes: 125
From: Liliha Bakery stuffing my face with coco puffs!
Code 41 what? When you run codes, a module number is provided. Module 1 is CCM, Module 4 is ECM, Module 9 is ABS. Which module reported 41?
Did the remanufactured ECM come with a MEMCAL? If not, did you make sure to put your old MEMCAL into the new ECM? Just covering the simple stuff.
Did the remanufactured ECM come with a MEMCAL? If not, did you make sure to put your old MEMCAL into the new ECM? Just covering the simple stuff.
Last edited by stew86MCSS396; Aug 29, 2020 at 10:57 PM.
Racer
Joined: Feb 2004
Posts: 423
Likes: 84
From: Rockwall TX
did you short pins A-G to get an H 41? if so, I agree with above to reseat the memcal. ECM r&r also reseats the 4 plugs to the ECM which could help. But with replacement ECMs and distributor you seem way past that.
Do both ECMs, and both distributors, give the same conditions??
I had a H41 pop up while driving, went to limp mode, drove a mile and made it home barely. My H41 did not cause a no start condition, engine still started, but very rough. I reseated, and it went away, back to normal. I was in the ECM last year when I burned my chip so was already familiar with it.
H 41 is loss of ECM serial data communications, for those of you keeping score..
Do both ECMs, and both distributors, give the same conditions??
I had a H41 pop up while driving, went to limp mode, drove a mile and made it home barely. My H41 did not cause a no start condition, engine still started, but very rough. I reseated, and it went away, back to normal. I was in the ECM last year when I burned my chip so was already familiar with it.
H 41 is loss of ECM serial data communications, for those of you keeping score..
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