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Old 07-13-2019, 06:24 AM   #1 (permalink)
Finnish_van
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1999 Chevy Express Cruise Issue

I have an 1999 Chevy Express with 6.5 TD.


Cruise does not work. All three fuses ok.



I cheked with the wiring diagram all the wires from the PCM connector with a 12 V tester screwdriver. Every wire had the right voltage depending on the wiring diagram, cruise switch and brake switch positions.


Is the PCM failed?


Are the grounds same for all functions of PCM or does the cruise have any grounds that affect only it?


Does the PCM box have multiple 12 V inputs?



Could there be a problem with vehicle speed sensor buffer? Speedometer and gearbox is working fine. How to check that signal?


And finally, does anyone have a wiring diagram of the whole PCM box connectors?


Thanks!

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Old 07-13-2019, 08:02 AM   #2 (permalink)
OkDually
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Quote:
Originally Posted by Finnish_van View Post
I have an 1999 Chevy Express with 6.5 TD.


Cruise does not work. All three fuses ok.



I cheked with the wiring diagram all the wires from the PCM connector with a 12 V tester screwdriver. Every wire had the right voltage depending on the wiring diagram, cruise switch and brake switch positions.


Is the PCM failed?


Are the grounds same for all functions of PCM or does the cruise have any grounds that affect only it?


Does the PCM box have multiple 12 V inputs?



Could there be a problem with vehicle speed sensor buffer? Speedometer and gearbox is working fine. How to check that signal?


And finally, does anyone have a wiring diagram of the whole PCM box connectors?


Thanks!

Have you checked for any Codes?
A Non working cruise control can be a sign of a bad PMD
Wiring diagrams link can be found in the FAQ:
BBB Industries- Premium Alternators, Starters, Power Steering Products and Turbochargers | TSB and Wiring Diagrams Database

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Old 07-13-2019, 08:38 AM   #3 (permalink)
Finnish_van
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There was a P1216 code earlier, but it was erased. After or before erasing cruise didnt work. The earlier owner said cruise never worked. They have changed the PMD and it is behind the grill now.
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Old Yesterday, 12:37 AM   #4 (permalink)
Finnish_van
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Is the P1216 fixed by a new PMD?
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Old Yesterday, 06:45 AM   #5 (permalink)
jnlperformance
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Injection pulse width errors (long and short) and most dtc(s) related to the injection system will disable cruise control. Along with pmd issues as stated above. Just throwing that in there...

Another consideration may be the wiring... could be a short in the cruise control circuit, a completely severed wire or a bad switch.

My knowledge with obd2 systems is limited... but that ^^^ 100% certain ^^^

hope this helps...
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Old Yesterday, 06:50 AM   #6 (permalink)
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Quote:
Originally Posted by Finnish_van View Post
...The earlier owner said cruise never worked...
Likely the switch or circuit issue then...

Kudos on the pmd behind the grill.... Make sure it's on the heatsink, a pmd without a heatsink is bad news.
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Old Today, 01:43 PM   #7 (permalink)
Finnish_van
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The PMD is with the heatsink. It's made in china, got to get on USA made instead.


There is no circuit issue, as far a checked and metered all the wirings and they were all ok, as the wiring diagram says.


Or could there be a circuit issue that a meter wont detect?
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Old Today, 03:32 PM   #8 (permalink)
uberhund67
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sometimes grounds do not show if they are intermittent.... and i have some BMWs that have issues with cruise control if ground is poor or intermittent and that doesnt always show properly with circuit testing...
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Old Today, 05:24 PM   #9 (permalink)
Finnish_van
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In the wiring diagram there is only one ground for the whole ECU. If the car is running, I assume the ground is ok. All the notes of cruise are hot wires, not grounded.
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