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- เผยแพร่เมื่อ 9 ก.ย. 2024
- GM FAULT CODE 42 ELECTRONIC SPARK TIMING (EST) CIRCUIT
Problem Finally Found -----WORKED FOR ME
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thank you for telling me at the end that the truck actually ran because I get this error code and my truck seems to run fine except sometimes getting a check engine light.
MY GOOD MAN YOU SAVED MY DAY. My truck was doing the same thing. I looked at every option but this and you were spot on the money. I’m very appreciative 🙏🏽
No problem 👍 and always God bless😇
I just replaced mines this weekend. I’m going to take grab the super lub this weekend and reinstall it. I used the white lub it came with.
😇
Great video. Same thing happening with my 1990 Bonneville. Didn't end up throwing code 42 until a week later. Took the ICM off and found a big crack in the rubber seal. I guess moisture was getting in over time and just finally started shorting out and making the vehicle stall. Going to change that out tonight and hopefully we'll be fixed.
By far the most helpful video on this. Most talk about bypassing the issue. Thank you.
You're welcome! and always God bless
Very helpful video. Just wanted to share this. While chasing my similar problem on a 94 gmc jimmy w engine code. I found my issue was the tan and black wire you disconnect while setting the timing. This vehicle only gets used in winter as a rural mail truck driven from passenger side. Years of wet feet on the carpet cause the connector to corrode and lose ability for timing to advance. Vehicle ran but poorly and chugged on hills really bad. So give that tan and black wire a good look...
Good comment I know those wires well . God bless Works for me
Also: the two screws on the dist. cap are 5.5mm ! Or a very SMALL phillips.
Now that you mentioned the AC issue I know we have the same problem.
Good video man keep them on the road and good looking out for others
Thank you God Bless
A code 33 will cause a 42 code to set. The module starts the engine on base timing. When the rpm reach a certain amount the ecm will camaned control of timing. But if the map sensor causes a low idle problem the ecm thinks there something rong with the est. So it set a 33 and a 42 code. I know because I just got true fixing a 1995 gmc 4.3 with this problem.
Code 42 means the ECM has seen an open or short to ground in the EST or bypass circuits . What I see (read ) again WHAT I SEE is a double problem and your EST circuit is on the verge of failure too. That is my and only my opinion on that. Map rides on 416 ,432,455 wires to c14,c11,d2 ECM input--- EST rides on 423,430,424,453 to d4,b5,d5,b3 ECM input two totally different feads to ECM. This video is for truck up to 1987 with ECM and some a trucks a little after like my 1994 suburban was the same. I would refer to a Haynes manual of your year and model is you best bet. Good luck God bless and thank you for your comment- as usual -Works for me
Last two schematics for your year scroll all the way down www.autozone.com/repairguides/GM-Blazer-Jimmy-Typhoon-Bravada-1983-1993-Repair-Guide/WIRING-DIAGRAMS/WIRING-DIAGRAMS/_/P-0900c1528003db5f
Nice video. I have codes: 33, 42, and 44. Not sure where to start. Advice welcome.
Right those down... Then remove negative battery terminal for 15 minutes ... replace then drive around and see which one(s) come back then start diagnosing one at a time with the method used by Hanes or Chilton manual if 42 comes back I would do that first .....
Fault code list
Code Description
12 System OK ( Diagnosis mode active )
13 Oxygen O2 Sensor - Circuit open/no activity
14 Coolant Temperature sensor - Resistance too high or shorted circuit
15 Coolant Temperature Sensor - Circuit low or open
16 Direct ignition system (DIS) - Faulty circuit / shorted circuit
17 Camshaft Position Sensor - Circuit/timing error
18 Camshaft or Crankshaft - Sensor/circuit/timing error
19 Crankshaft sensor - Sensor/circuit/timing error
21 Throttle position sensor - Out of range/Performance
22 Throttle position sensor - Low Voltage
23 Intake Air temp sensor - Out of range, low resistance
24 Vehicle speed sensor - Circuit fault
25 Intake Air temp sensor - Out of range, high resistance
26 QDM A ( Quad-driver module ) - Circuit #1 fault
27 QDM A ( Quad-driver module ) - 2nd gear circuit
28 QDM A ( Quad-driver module ) - Circuit #2 fault
29 QDM A ( Quad driver module ) - 4th gear circuit
31 Wastegate solenoid - Circuit fault
32 EGR ( Exhaust Gas Recirculation ) - Circuit fault
33 Manifold Air Pressure Sensor - Signal out of range, high resistance
34 Manifold Air Pressure Sensor - Signal out of range, low resistance
35 Idle air control valve / Sensor - Circuit fault
36 Ignition system - Circuit error/fault
38 Brake input ( Brake switch sensor ) - Circuit fault
39 Clutch input ( Clutch sensor ) - Circuit fault
41 Camshaft sensor - Circuit fault or ignition control - circuit fault/error (depending on the car model)
42 EST (Electronic spark timing) - Circuit grounded/shorted
43 Knock sensor / Electronic spark control - Circuit fault error (depending on the car model)
44 Oxygen O2 sensor - Lean Mixture
45 Oxygen O 2sensor - Rich Mixture
46 Pass-key II - Circuit or Power steering pressure switch - circuit fault error (depending on the car model)
47 PCM data - Circuit error
48 Misfire (diagnosis)
51 Calibration error - Mem-cal, ECM, or EPROM failure
52 Engine oil temperature circuit - Low temperature indicated / circuit error
53 Battery voltage - Low/high/error or Egr valve solenoid 1 - circuit error (depending on the car model )
54 Fuel Pump - Circuit error or Egr valve solenoid 2 - Circuit error (depending on the car model )
55 ECM PCM - Circuit error or EGR valve solenoid 3 - Circuit error (depending on the car model )
56 Quad-driver module (QDM B) - Circuit error
57 Boost control - Error / Faulty
58 Vehicle anti-theft system ( VATS ) - Circuit faulty
61 AC (Air conditioning) system performance or degraded oxygen sensor signal (depending on the car model)
62 Engine oil temperature sensor - High temperature indicated
63 Oxygen O2 sensor right side - Circuit open or MAP (manifold air pressure sensor ) - out of range (depending on the car model )
64 Oxygen O2 sensor right side - Lean mixture indicated
65 Oxygen O2 sensor right side - Rich mixture indicated
66 A/C (Air conditioning ) pressure sensor - Circuit low pressure
67 A/C (Air conditioning ) pressure sensor - Circuit or a/c clutch - circuit failure (depending on the car model)
68 A/C (Air conditioning ) compressor relay - Circuit failure error
69 A/C (Air conditioning ) clutch - Circuit/pressure high
70 A/C (Air conditioning ) refrigerant pressure - Circuit high
71 A/C (Air conditioning ) evaporator temperature sensor - circuit low
72 Gear selector switch - Circuit error/fault
73 A/C (Air conditioning) Evaporator temperature - Circuit high
75 Digital EGR #2 - Solenoid error/faulty
76 Digital EGR #3 - Solenoid error/faulty
77 Digital EGR #1 - Solenoid error/faulty
79 Vehicle speed sensor (SS) - Circuit signal high resistance
80 Vehicle speed sensor (VSS) - Circuit signal low resistance
81 Brake input data - Circuit faulty
82 Ignition control (IC) 3X - Signal error/faulty circuit
85 Prom - Error/faulty circuit
86 Analog/digital - Pcm error /faulty circuit
87 Eprom - Error / faulty circuit
99 Power management - Error / faulty circuit
Curious though, what is making the module overheat to the point where it fails? Could a bad ground somewhere in the truck could be causing this ? But great info .I didn't know auto stores could bench test the modules . Thanks again!
Good question! it is called poor engineering😇
I’m getting code 42 on my 94 Silverado but it runs just fine no symptoms of anything. Idk what to do.
Page 2 www.2carpros.com/questions/error-code-42-no-spark
More :::
f01.justanswer.com/heavy_chevy_396/c9f8c0ab-4f25-45bf-ab3a-733f9a47556b_1988_Chevrolet_Pickup_7.4L_Eng_VIN_N_V30_code_42_no_est.pdf 😇
Thank you !!!
You're welcome! and God bless😇
@@mbjdiy1778 God bless you too.
My 91 s10 never did turn light on, but jumping obd1 connector it shows up, First ignition module replacement was from driving on the hwy, everything good till went to pass someone, Then all hell break loose, no power with tremendous backfiring out the exhaust, really loud, pull over side of hwy and truck would just sit and idle pretty as could be till tried gas it, would go dead but start right back up, In dire strait's, I get Advanced ignition module, fixed truck,,, for little while, Then the hair pulling started, while cold truck runs slick as button till hot, from dead stop would start to accelerate and fall flat on its face, if AC on would go dead, replaced fuel pump, TPS sensor, coil, did the lean on and tap test on comp, with no check engine lamp, jumped obd1 connector and there was a 42, I have a delphi module ordered and crossing my fingers. will let know turn out. Personally, I believe everything from Advance or Autozone is complete garbage!
Yes I had to order mine from amazon which was AC Delco OEM. Good Luck God bless and works for me
Any update on this? @jocrp6
Thanks, I just got a code 42 in my 1991 Silverado, 350tbi already shot a small parts cannon at it, fuel filter, iac valve(sooted up), fuel pressure regulator rebuild(spring rusted and broke), cap, wires and plugs, and new screens on the injectors, timing checked. Fpr kit from Summit(house kit), all other parts from Rock Auto and all AC/DELCO. As of this post...delco icm ordered for my daily. What confused the hell out of me was that it starts and revs fine....just dies at stop or drop in gear. This has to work, lol.
Yeah i had to wait for that code to go solid to fix this part. EGR went bad shortly after that fix ... I think the bad Idle when it would also damaged my EGR - works for me - Good luck God bless ... watch your EGR for possible failure also after fixing the other.
Hoping someone can help!!! Recently replaced ICM. Wouldn’t start but idled good, drove it for a week now and have code 42 and no start. Any ideas how to test the ICM???
Signs of a Bad Ignition Module
1. Acceleration Issues. The vehicle may shake, vibrate or jerk when the gas pedal is pressed.
2. There may be hesitation or lack of power during increases in speed.
3. Temperature Problems. A faulty ignition module can cause a vehicle to overheat. ...
4. No Power. The engine may turn over without starting.
********HOW TO TEST The GM Ignition Control Module (1995-2005)****** easyautodiagnostics.com/gm/4.3L-5.0L-5.7L/how-to-test-the-icm-1 \
Hope this helps and God Bless
also search pages ::
www.google.com/search?q=what+is+the+gm+fault+number+for+bad+icm+1987+r20&source=lmns&bih=939&biw=1880&client=opera&hl=en&sa=X&ved=2ahUKEwiCvrfYzLL1AhVFrWoFHU66AG0Q_AUoAHoECAEQAA
I just had this code come up on my 92 Cavalier. My ICM and one coil recently went out so I replaced them and the car ran fine for a couple hundred miles and then the CEL came on and set the code 42. I did the same tests that were in your flow chart since the factory Cavalier service manual flow chart was the same. I tested circuit 423 and 424 and ruled out the ECM as the problem but now I'm not sure if there is a wiring problem or the new ICM has a problem. None of our local auto parts store checks ICM's anymore so I have no way of checking it. Any advice?
Call a reputable Chevrolet dealer parts department and either get the OEM part number or buy it through them ( I bought an aftermarket and it failed about a minute after install)you must also check your manual that 42 is the same code as trucks . some codes vary - good luck works for me
@@mbjdiy1778 I used an AC Delco module quite a few years ago and it didn't last. The one that has lasted the longest in the 14 years I've owned the car was a Borg Warner one which lasted about 99,000 miles. They no longer carry it and is why I got the Standard brand.
always kept several 5 and seven connecter "oem" know working modules in my boxes to just quickly switch them out for fast diagnosis
pigtails😇
Where did you get the shop manual?
Look in the description section below the video I have the link right there.
Good luck God bless.
www.gmsquarebody.com/threads/87-v10-350tbi-cutting-out-intermittently.13177/
Thanks for the link. Do you know where to get the book that describes all the codes for this truck? @@mbjdiy1778
On that site.
Hold the phone your ac works
?
Great vid!!!!!
Thank you and God bless
where is the obd location on chevy c10 custom deluxe square body 1986
This should help God bless www.google.com/search?q=where+is+the+obd+location+on+chevy+c10+custom+deluxe+square+body+1986&rlz=1C1CHBF_enUS899US899&oq=where+is+the+obd+location+on+chevy+c10+custom+deluxe+square+body+1986&aqs=chrome..69i57.1465j0j15&sourceid=chrome&ie=UTF-8
BUENO !
Did that troubleshoot come from a Chilton or Haynes Manual?
I got them online. Look below the video in my comments I have the web addresses for them. God bless.
MBJREPORT DIY thanks brother !
Thank you and God bless and God bless America
i recognize it from the fsm
Great video
Thank you so much
Question, if ya dont mind - How did you figure determine that you had a code 42?
1. first check engine light
2. did diagnostic crossing a and b with wire on diagnostic port ignition to to on before no engine to run first key click
3. flash 12 two to three times then then flash count 42 two to three times depending on vehicle
4. diagnostics began (works for me) God bless
www.obd-codes.com/faq/read-gm-2-digit-obd-codes-free.php
You short together the upper right 2 pins on the data link connector at the base of the dash under the steering wheel. U will see a obd 1 connector mounted to the bottom of the nee bolster at about nee level. Cross upper right pins then turn on the ignition to the run position then watch the service engine soon light it will Flash 1 then 11 then if there's any codes you will count the lights as they Flash after the 1 11 signal is given. Example flash ,flash flash . It will do this 3 times. Then u will see any codes after that. Example flash flash flash flash. Flash flash =42
Don't start the engine, only place ignition in run.
It will Flash once and pose then flash twice. Then pay close attention after that if u have any codes u will count the flashing ses(service engine soon) light.
Example flash -- flash flash
It will do this 3 times before showing codes. After u will see example flash flash flash flash -- pause -flash flash =42.
where does the lube go?
On the distributer plate and bottom of EST that touches the plate once tightened wipe off excess . Works for me God bless and great question
I replaced the spark control module, the ignition control module, and the oxygen sensor and I'm still getting code 42
Scroll down to trouble shooting diagram (two pages Down )... Good luck god bless 😇 forum.73-87chevytrucks.com/smforum/index.php?topic=36657.0
Also www.thirdgen.org/forums/electronics/291496-error-code-42-a.html scroll down Attached Thumbnails
More : f01.justanswer.com/heavy_chevy_396/c9f8c0ab-4f25-45bf-ab3a-733f9a47556b_1988_Chevrolet_Pickup_7.4L_Eng_VIN_N_V30_code_42_no_est.pdf
Broken Wire ,Bad connector , and the ever so rare mother board or (ECM) follow these trouble shooting sites these are manual steps which walk you through your nightmare ... God bless Tanya😇
Mine turned out to be the distributor. I ended up replacing all the parts you did plus relays and alternator. Turned out to be distributor in the end. Good luck
Very uninformative
Works for me . God bless