Cruise Control Tester J-34185-B

[akbeaver]

I am trying to troubleshoot my inop cruise control so I purchased a Cruise Control tester J-34185-B.

I already checked the vacuum lines, solenoid actuated vacuum servo and cables.

The Corvette SM tells me to follow the instructions that come with the Tester. I don't have the instructions for the Tester. Supposedly a two page instruction sheet.

Anyone out there that knows how to use the Tester or has a copy of the instructions, please help me out.

I have checked out the internet, various forums, the manufacturer, etc., for the instructions. No luck.

Someone out there has this info.

Thanks,

Jim

 

[ecss]

I am trying to troubleshoot my inop cruise control so I purchased a Cruise Control tester J-34185-B.

I already checked the vacuum lines, solenoid actuated vacuum servo and cables.

The Corvette SM tells me to follow the instructions that come with the Tester. I don't have the instructions for the Tester. Supposedly a two page instruction sheet.

Anyone out there that knows how to use the Tester or has a copy of the instructions, please help me out.

I have checked out the internet, various forums, the manufacturer, etc., for the instructions. No luck.

Someone out there has this info.

Thanks,

Jim

If this is for your 94, the service manual has a flow chart how to test a cruise control that will not engage.

You need to remove the dash panel to get to the cruise control module to test the voltages.

I don't see any mention of needing to use a special tester in the Helms service manual for a 94

 

[akbeaver]

Cruise Control

If this is for your 94, the service manual has a flow chart how to test a cruise control that will not engage.

You need to remove the dash panel to get to the cruise control module to test the voltages.

I don't see any mention of needing to use a special tester in the Helms service manual for a 94

Thanks for your reply.

Yes, this is for a 1994 Coupe.

I have the factory Service Manual Part No. ST 364-941 1A, ST 364-941 1B, and ST364942, which I obtained from Helms also. We might have the same manuals.

If you also have that set of SM's, please look on page 9B-2, where it talks about performing a few initial checks before turning to Page 8A-34-0, and running the flow chart. To perform those initial checks, the SM refers to several versions of a quick check instrument similar to tool J 34185-B. (Which I have but not the instructions detailing how to use it).

I am aware that I would need to remove the RH side of the instrument panel to access the cruise control module. However, prior to doing that, there are a number of things that are more easily accessed that could be checked for electrical function such as the servo, the brake and clutch release switches, and the electrical grounds.

I would rather have a direction to trouble shoot, as provided by a "quick tester" such as the J 34185-B than tear apart my interior (again) in the off chance I will be lucky to find the offending part using hit or miss methods. It may come down to that. I might even have to start throwing parts at it. But for now, I would like to get an idea of what is indicated by the quick tester results.

So, if you have any information regarding how to use the J 34185-B to perform a quick test on the cruise control, I would appreciate you sharing. Otherwise, I have the SM procedures that I can follow.

Cheers!

 

[ecss]

A used cruise control module is around $70.00. It's not a high failure rate item.

To use the tester you purchased requires you gain access to the cruise control module.

The tester has two connectors. One is a 12 pin connector. Six fingers on each side of the connector. You unplug the connector at the cruise control module and plug the edge connector into the unplugged cruise control connector.

The back of the tester has the 7 tests and what the indicators should light up under what conditions.

It really doesn't tell you any more information that a volt meter would.

You turn the ignition On Cruise control On and with the vehicle moving the VSS light should flash.
You already know the VSS is working because your speedometer works.
With ignition On and Cruise control On you verify the status of the Vent Valve Control Signal and the Vacuum Control Valve Signal lights.

You can also verify the Brake Cruise Control switch which is in series with the Clutch Cruise Control switch.
Both switches must be closed for the Cruise Control to engage.

You also press the R/A and Set switch and verify the status of the lights.

You said you verified the vacuum servo works and the two vacuum hoses don't leak I'd use an ohm meter and verify at the multifunction stalk connector the Cruise control On/Run switch, the Set switch and the R/A switch work.

With out using the tester you can verify the status of the Clutch and Brake switch. The easiest way to test them is to remove the dash cover. With ignition On and Cruise Control On you should have 12 volts on Pin G Brown/White wire of the cruise control module. If no 12 volts the cruise control fuse is blown, the cruise control On switch is bad, the Brake or Clutch cruise control switch is open when both of them should be closed.

Red arrow points to the tester connector you would use.

 

[akbeaver]

Thanks

A used cruise control module is around $70.00. It's not a high failure rate item.

To use the tester you purchased requires you gain access to the cruise control module.

The tester has two connectors. One is a 12 pin connector. Six fingers on each side of the connector. You unplug the connector at the cruise control module and plug the edge connector into the unplugged cruise control connector.

The back of the tester has the 7 tests and what the indicators should light up under what conditions.

It really doesn't tell you any more information that a volt meter would.

You turn the ignition On Cruise control On and with the vehicle moving the VSS light should flash.
You already know the VSS is working because your speedometer works.
With ignition On and Cruise control On you verify the status of the Vent Valve Control Signal and the Vacuum Control Valve Signal lights.

You can also verify the Brake Cruise Control switch which is in series with the Clutch Cruise Control switch.
Both switches must be closed for the Cruise Control to engage.

You also press the R/A and Set switch and verify the status of the lights.

You said you verified the vacuum servo works and the two vacuum hoses don't leak I'd use an ohm meter and verify at the multifunction stalk connector the Cruise control On/Run switch, the Set switch and the R/A switch work.

With out using the tester you can verify the status of the Clutch and Brake switch. The easiest way to test them is to remove the dash cover. With ignition On and Cruise Control On you should have 12 volts on Pin G Brown/White wire of the cruise control module. If no 12 volts the cruise control fuse is blown, the cruise control On switch is bad, the Brake or Clutch cruise control switch is open when both of them should be closed.

Red arrow points to the tester connector you would use.

Thanks.