1994 C4 problems and codes

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Jul 12, 2024 | 09:20 AM

Ayjoki

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1994 C4 problems and codes

My 94’s speedometer read 0 and doesn’t change as well as the odometer not moving from current mileage. Getting codes H24 H59 H73 H82 H83 H90

DTC 24 – Vehicle Speed Sensor (VSS) Circuit

DTC 59 – Transmission Fluid Temperature (TFT) Sensor Circuit High (Low Temperature Indicated)

DTC 73 – Pressure Control Solenoid (PCS) Circuit (Current Error)

DTC 82 – Transmission 1-2 Shift Solenoid Circuit

DTC 83 – TCC PWM Solenoid Circuit Fault

DTC 90 – Transmission TCC Solenoid Circuit

I know they have an H for history but I cleared them and these ones came right back. If anyone has any possible solutions and or where these components are and what the ohms should be I’d be very grateful.

Jul 12, 2024 | 11:31 AM

OneRedVette

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From: East Tennessee

You need to inspect the harness going to the transmission. I'm unsure if there is a fuse powering transmission components, but its worth taking a look at your fuse boxes.

Jul 18, 2024 | 09:28 AM

Ayjoki

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Quote:

Originally Posted by OneRedVette

You need to inspect the harness going to the transmission. I'm unsure if there is a fuse powering transmission components, but it’s worth taking a look at your fuse boxes.

Ok will do but should my zf6 manual transmission even have these sensors? Isn’t the tcc solenoid for an automatic?

Jul 18, 2024 | 09:32 AM

OneRedVette

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From: East Tennessee

Well that would've been very useful information to have.

Sounds like it thinks it's an automatic... Has the computer be replaced, tampered with, or tuned?

Jul 18, 2024 | 10:32 AM

Ayjoki

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Quote:

Originally Posted by OneRedVette

Well that would've been very useful information to have.

Sounds like it thinks it's an automatic... Has the computer be replaced, tampered with, or tuned?

ah yes I’m sorry I wrote in another post it was a manual but it slipped my mind to add it to this one. I just recently got this car less then a week ago so I am not sure but I was thinking that was a possibility. My speedometer shows 0 and doesn’t change nor does my odometer count.

Jul 19, 2024 | 07:35 AM

jmgtp

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Sounds like the PCM, for some reason, has a bin (the “programming”) for an automatic. Probably replaced at some point in the past with a junkyard unit. If you have a Windows laptop and invest in a <$100 cable you can reflash it easily yourself with free software - that is presuming the rest of the engine is stock, if it’s modded then tuning for those mods gets a bit more complicated.

Jul 19, 2024 | 07:56 AM

Ayjoki

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Quote:

Originally Posted by jmgtp

I made my own cable for my old 95 Camaro that had a obd1 brain and obd2 port is that the cable I need? Or something else?

Jul 19, 2024 | 07:58 AM

jmgtp

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Should be the same. eeHack and Flashhack are the software tools you’ll want

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Jul 19, 2024 | 09:24 AM

Ayjoki

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Quote:

Originally Posted by jmgtp

Should be the same. eeHack and Flashhack are the software tools you’ll want

ok thank you, where do I get the stock tune/file for 1994 manual?

Jul 19, 2024 | 09:44 AM

#10

jmgtp

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I fired up my tuning PC and searched but couldn’t find a stock bin for 94. I’m sure someone on the forum will have one they can send you.

Jul 19, 2024 | 11:00 AM

#11

Ayjoki

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Quote:

Originally Posted by jmgtp

I fired up my tuning PC and searched but couldn’t find a stock bin for 94. I’m sure someone on the forum will have one they can send you.

Ok I make a post for that but do you know why the speedometer with 0 with a code 24? From what I’ve seen is the ecm not seeing the vss signal

Jul 19, 2024 | 11:01 AM

#12

FrankieD

Burning Brakes

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From: Richmond Hill Ontario

BINS can be found here:

https://ecmhack.com/tutorials/bin-files/

Jul 19, 2024 | 11:22 AM

#13

jmgtp

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I’d start with validating you have the right bin before digging in on codes/speedo. Might be related, I don’t know if the VSS for auto is different, it’s probably expecting different counts at minimum. The right bin might resolve it.

Jul 19, 2024 | 12:30 PM

#14

Ayjoki

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Quote:

Originally Posted by FrankieD

BINS can be found here:

https://ecmhack.com/tutorials/bin-files/

Thank you I appreciate it

Jul 19, 2024 | 12:31 PM

#15

Ayjoki

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Quote:

Originally Posted by jmgtp

that is very true with the gear ratio being different, do I need both eeHack and Flashhack?

Jul 19, 2024 | 01:35 PM

#16

FrankieD

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From: Richmond Hill Ontario

EEHack is only used if you want to Datalog
Flashhack is needed to Tune / Flash the PCM

So you only need Flashhack

Jul 19, 2024 | 04:58 PM

#17

Ayjoki

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Quote:

Originally Posted by FrankieD

EEHack is only used if you want to Datalog
Flashhack is needed to Tune / Flash the PCM

So you only need Flashhack

Ok thank you, I’ll be doing the flash after work and update if any check engine lights remain

Jul 19, 2024 | 08:08 PM

#18

Ayjoki

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Quote:

Originally Posted by Ayjoki

Ok thank you, I’ll be doing the flash after work and update if any check engine lights remain

Everythjng works now, speedometer, odometer. No engine check codes! It was just the wrong bin, even the pedal feels heavy and the car more responsive. Thank you all very much for your help

Last edited by Ayjoki; Jul 19, 2024 at 08:16 PM.

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