Cruise control works intermittently

Tiny
DENO2970
  • MEMBER
  • 1995 TOYOTA CAMRY
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Cruise control works an doesn't work intermittently. When it doesn't want to work, the cruise control indicator light flashes 5 times and it will not come back on until you turn the ignition off and restart the engine, and even then you have 50/50 chance it will work properly. Note: It seems to not work at all only on the first try every time. If it works the very first time after starting the engine, it usually works from there on out. Could someone help please?
Tuesday, January 5th, 2021 AT 12:19 PM

6 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,648 POSTS
It sounds like the cruise control ECU has gone bad. Here is the location so you can try replacing it. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Wednesday, January 6th, 2021 AT 11:50 AM
Tiny
DENO2970
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  • 19 POSTS
With respect sir, I really want the Toyota Service Manual troubleshooting procedure before that can be determined. I have a Toyota Engine Service Manual but it has no info on troubleshooting the Cruise control circuitry. What does the blinking (5) times mean? PC?
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Thursday, January 7th, 2021 AT 10:33 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,648 POSTS
The blinking light means there is an operational l error. This guide can show you how to get the codes:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Here is the factory testing procedures. Check out the diagrams (below). Please let us know what you find.
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Thursday, January 7th, 2021 AT 12:08 PM
Tiny
DENO2970
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  • 19 POSTS
Thank you. I will be in touch with my diagnosis.
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Thursday, January 7th, 2021 AT 12:17 PM
Tiny
DENO2970
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  • 19 POSTS
Hello Ken, upon further testing of the Cruise Control System, I've uncovered a very simple but illusive type problem. The switch on the column is the culprit. I did two separate experiments with the switch. First I press down on the lever to activate the Cruise Control like I would normally, using a moderate amount of force, which failed the test (error code). Second, I press the lever down with liberal force and the test passed every time. The contacts inside the mechanical switch are dirty (not making good contact) or it is a defective switch.
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Sunday, January 10th, 2021 AT 4:26 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Good find! Here is a picture and description of the switch.

Cruise ON-OFF switch is power switch for cruise control system. When ignition is turned off, cruise ON-OFF switch is also turned off. Switch remains off even when ignition is turned on again.

SET/COAST Position
With cruise ON-OFF switch on, and vehicle speed greater than 25 MPH, set cruise control switch to SET/COAST position and release switch. CC ECU will store and constantly control vehicle speed.

While in cruise control mode, if cruise control switch is set and held in SET/COAST position, actuator will be energized. Engine throttle valve will close, and vehicle will decelerate until switch is released. From then on, CC ECU will store and constantly control new vehicle speed. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Monday, January 11th, 2021 AT 12:04 PM

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