Hey, I discovered by perusing my '86 Tercel service manual that the cruise computer can be put in diagnostic mode by starting engine, then holding "set" switch while turning on cruise main switch. The light will blink different amounts of time for different tests. "set" test is two flashes, "resume" is 3 flashes, when driving, a series of equal flashes verifies speed sensor. Another test can be invoked by pressing "set" 3 times in 2 seconds. Then some more codes start flashing. Mine failed this part which indicates a bad computer. Does anyone have a cruise computer, p/n 88240-12150 they could part with cheap? I can post the other codes if anyone is in need. But they are out of a Tercel manual. The first batch matched my coupe however.
Hey, I discovered by perusing my '86 Tercel service manual that the cruise computer can be put in diagnostic mode by starting engine, then holding "set" switch while turning on cruise main switch. The light will blink different amounts of time for different tests. "set" test is two flashes, "resume" is 3 flashes, when driving, a series of equal flashes verifies speed sensor. Another test can be invoked by pressing "set" 3 times in 2 seconds. Then some more codes start flashing. Mine failed this part which indicates a bad computer. Does anyone have a cruise computer, p/n 88240-12150 they could part with cheap? I can post the other codes if anyone is in need. But they are out of a Tercel manual. The first batch matched my coupe however.
Yes please post the other codes and what they mean. (i.e. good bad sensor etc)
Hey, I discovered by perusing my '86 Tercel service manual that the cruise computer can be put in diagnostic mode by starting engine, then holding "set" switch while turning on cruise main switch. The light will blink different amounts of time for different tests. "set" test is two flashes, "resume" is 3 flashes, when driving, a series of equal flashes verifies speed sensor. Another test can be invoked by pressing "set" 3 times in 2 seconds. Then some more codes start flashing. Mine failed this part which indicates a bad computer. Does anyone have a cruise computer, p/n 88240-12150 they could part with cheap? I can post the other codes if anyone is in need. But they are out of a Tercel manual. The first batch matched my coupe however.
Hmmm, pressing "set" 3 times in 2 seconds does nothing for me either. The other tests do like you say. I've tired two different cruise computers and I can't imagine both are bad. You might want to wait on getting a new computer.
I knew you were going to ask that! OK, the codes in my first post are type A codes. Additionally, pressing clutch, (or neutral for automatic), brake, or parking brake should not light the indicator light.
Now, leave ignition and main sw. on, and set/coast switch on 3 times in 2 seconds. Rapid flashing, .25 sec on/off--Normal. Code 11 .5 sec on, 1.5 sec off--actuator circuit is abnormal. Code 21 two flash, 1.5 sec off, one flash--speed sensor signal circuit is abnormal. Code 23 two flash, 1.5 sec pause, 3 flash--speed sensor circuit abnormal. Code 31 3 flash, pause, 1 flash--accel/resume switch is abnormal. Code 33 3 flash, pause, 3 flash--accel/resume switch is abnormal. Notes: 1)Indication codes appear with propriety from NO 11. 2) Normal code continues 20 seconds and abnormal codes are repeated 3 times. 3) Indication is stopped when vehicle speed is over 10 mph or main switch is turned off. 4) If there is no code, perform diagnosis and inspection.
There's a lot more to the testing sections, but I can't cover it all. Book says if all codes are normal, replace the computer. Note this is from a '86 Tercel book!
I knew you were going to ask that! OK, the codes in my first post are type A codes. Additionally, pressing clutch, (or neutral for automatic), brake, or parking brake should not light the indicator light.
Now, leave ignition and main sw. on, and set/coast switch on 3 times in 2 seconds. Rapid flashing, .25 sec on/off--Normal. Code 11 .5 sec on, 1.5 sec off--actuator circuit is abnormal. Code 21 two flash, 1.5 sec off, one flash--speed sensor signal circuit is abnormal. Code 23 two flash, 1.5 sec pause, 3 flash--speed sensor circuit abnormal. Code 31 3 flash, pause, 1 flash--accel/resume switch is abnormal. Code 33 3 flash, pause, 3 flash--accel/resume switch is abnormal. Notes: 1)Indication codes appear with propriety from NO 11. 2) Normal code continues 20 seconds and abnormal codes are repeated 3 times. 3) Indication is stopped when vehicle speed is over 10 mph or main switch is turned off. 4) If there is no code, perform diagnosis and inspection.
Hey thanks for posting back. Couple Q's does the motor have to be running to perform the test or just key on? Also, when you say " pressing clutch, (or neutral for automatic), brake, or parking brake should not light the indicator light." Do you mean when putting the cruise into diagnostic mode, pressing any of these should "not" light a code or should to indicate they are functional?
Quote:
Originally Posted by voganni
There's a lot more to the testing sections, but I can't cover it all. Book says if all codes are normal, replace the computer. Note this is from a '86 Tercel book!
I'm wondering if 88+ might be different? I'll have to look for a service manual.
Motor on or off. But, obviously, motor needs to be on for speed test! lol. Book says there will be no light when brake, clutch, or parking brake are applied if these circuits are good.
You can do a resistance check on your actuator to check the coils. Looking into the socket, pins are in upside down triangle. Pin 2 on left, 1 on right, 3 on bottom. Between 2--3, about 30 ohms. Between 1--3, about 68 ohms. Mine passed this. You can hook 12 volts to the vacuum pump and feel it suck vacuum. 12 volts to the vacuum switch will turn it on or off. All that stuff works on mine too. Did you go for a drive and check the speed sensor? Mine passed that too. Only thing I have left that I can't verify is the computer, but I sure won't be buying a new one! Sounds like we have a similar problem, sure be nice to figure it out. Let me know if you discover anything.
Motor on or off. But, obviously, motor needs to be on for speed test! lol. Book says there will be no light when brake, clutch, or parking brake are applied if these circuits are good.
You can do a resistance check on your actuator to check the coils. Looking into the socket, pins are in upside down triangle. Pin 2 on left, 1 on right, 3 on bottom. Between 2--3, about 30 ohms. Between 1--3, about 68 ohms. Mine passed this. You can hook 12 volts to the vacuum pump and feel it suck vacuum. 12 volts to the vacuum switch will turn it on or off. All that stuff works on mine too. Did you go for a drive and check the speed sensor? Mine passed that too. Only thing I have left that I can't verify is the computer, but I sure won't be buying a new one! Sounds like we have a similar problem, sure be nice to figure it out. Let me know if you discover anything.
Yeah it passed the speed sensor test according to your post, I'll have to check the actuator and vacuum switch. Do these cars have a vacuum pump?? I thought there was just a vacuum switch to turn vacuum on and off from the manifold to the actuator.
I'll be honest I haven't really started trouble shooting this at all as it been busy at work. I'll be putting the car down for the winter soon but I'll post if I find anything, would be nice to have the cruise working. Sounds like we have the same issue though.
I discovered that with our model, with the engine off, you get the type B codes, and with engine on, type A codes. With engine off my indicator light started flashing to indicate normal, lol.
I thought I was onto something with the vacuum actuator, it wouldn't pull a vacuum with the solenoids energised (both must be on at the same time to activate the cable pull). But I took it apart and sealed the edge of the rubber with silicone and now it will suck the cable thingy down and hold it. But, still no cruise. Use a hand vacuum pump for this test. 12v to pins 1&2, neg to pin 3.
Yes there is a vacuum pump, right by the wiper motor. Vacuum switch is mounted on the actuator.
Did yours ever work? Mine's been dead since I bought the car. Wish I had a known good computer to try. Like you said, hate to go buy one and have it not be the problem. Good Luck, Bill
I discovered that with our model, with the engine off, you get the type B codes, and with engine on, type A codes. With engine off my indicator light started flashing to indicate normal, lol.
I thought I was onto something with the vacuum actuator, it wouldn't pull a vacuum with the solenoids energised (both must be on at the same time to activate the cable pull). But I took it apart and sealed the edge of the rubber with silicone and now it will suck the cable thingy down and hold it. But, still no cruise. Use a hand vacuum pump for this test. 12v to pins 1&2, neg to pin 3.
Yes there is a vacuum pump, right by the wiper motor. Vacuum switch is mounted on the actuator.
Did yours ever work? Mine's been dead since I bought the car. Wish I had a known good computer to try. Like you said, hate to go buy one and have it not be the problem. Good Luck, Bill
Same here, it's never worked since I bought it so I have nothing to reference by. Hmmm, ok, well I noticed the vacuum pump there but the setup also has a vacuum line going to manifold vacuum. I'll assume the vacuum pump is a helper vacuum source? It's possible the previous owner messed with it and screwed up the vacuum lines. I'm going to try and test the rest of the stuff this weekend. Good luck!
I'm too old to not have cruise control on the highway, everything in my body aches already, especially my legs!
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Well, if you don't use it, perhaps you'd like to donate your computer? lol
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