Do I need to readjust the Tach

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vsj552001

Member - Posts: 2

Joined: February 27, 2003

Location: Canada

Posted: February 27, 2003 at 11:11 AM / IP Logged

During a few cold mornings this year (below -15C/5F) my '99 Corolla didn't start. Does this mean that I have to readjust the tach. It didn't even crank and when I started the car with the key and then used idle mode it stopped after running briefly. After the car warmed up a bit then it was then fine. Does anyone know why? Obviously, this is going to be hard to troubleshoot - I have to wait until it is below -15C and the problem didn't appear each cold morning. Now that the weather is getting around freezing I guess I'll have to wait until next year. I wish I had done some more tests.

Some history ...

I personally installed a CT-3100 PROSTART starter in the '99 Corolla 2 years. I haven't had any problems until this year after I got my car fixed in January from a car accident. . The mechanics did some body work and replaced the radiator, battery and fuse box. Other than this little problem it works fine. Could it be the battery that is weak in cold weather?

jrilla

Gold - Posts: 1,498

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Joined: November 19, 2002

Location: North Dakota, United States

Posted: February 27, 2003 at 12:51 PM / IP Logged

TACH ADJUSTMENTS

ProStart systems have two methods of fine-tuning

the Tach signal that is generated from the vehicle,

the first method is manual Tach searching and

setting and the second is automatic Tach searching

and setting. Either method can be used, however an

automatic search is recommended. Tach adjustment

procedures should be done every time a

new unit is installed. This is because the Tach

signal from some ignition systems can sometimes be

too high or too low, thus causing failed starts under

different temperatures.

The procedures for Tach adjustment are as

follows:

1. Hold Hood switch down for 6 seconds.

2. Release pin-switch (Hood switch). Parking

lights should turn ON.

3. With Parking lights ON, immediately press and

release pin-switch again.

4. Parking lights will stay ON for up to 20

seconds. (If not repeat from step 1)

5. With Parking lights ON, press CH3 (TRUNK)

of the transmitter. (Parking lights will flash 1 to

7 times)

6. Start the vehicle using the key.

7. If Parking lights stays ON, then you have

selected an incorrect Tach wire. (Relocate Tach

wire and start from step 1) If Parking lights go

OFF then proceed to the next step.

8. Allow vehicle to reach regular engine idle

speed, then press and release brakes. (Parking

lights will flash appropriate setting, from 1 to 7

flashes)

9. Press CH3 (TRUNK) of the transmitter, to save

setting. (Parking lights will flash one long flash)

NOTE: A manual adjustment should only be

done if the auto setting is not completing the

crank cycle properly in cold weather.

MANUAL TACH SEARCHING AND SETTING

1. Hold the pin-switch (Hood switch) down for 6

seconds.

2. Release pin-switch. Parking lights should turn

ON.

3. With Parking lights ON, immediately press and

release pin-switch again.

4. Parking lights will stay ON for 20 sec. (If not

repeat from step 1)

5. Press CH3 (TRUNK) of remote transmitter at

the same time. (Parking lights will flash 1 to 7

times)

6. Now you can increase or decrease the Tach

settings, depending on your needs.

7. CH1 will decrease the setting, and CH2 will

increase the setting.

8. After proper setting has been reached, press

CH3 (TRUNK) to save setting. (Parking lights

should flash once long.

J Rilla

Owner/Installer

vsj552001

Member - Posts: 2

Joined: February 27, 2003

Location: Canada

Posted: February 27, 2003 at 2:35 PM / IP Logged

J Rilla,

I'm assuming from your answer that you think that I should do a "tach adjustment" again and that should solve the problem I described. I guess it couldn't hurt. I guess I'm just trying to understand why it did not start this year when in the previous years it did. Hmm...Perhaps it was colder this year.

vsj

jrilla

Gold - Posts: 1,498

Joined: November 19, 2002

Location: North Dakota, United States

Posted: February 27, 2003 at 2:58 PM / IP Logged

I actually just copied and pasted that entire response from the manual. It cant hurt to try.

J Rilla

Owner/Installer

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Do I need to readjust the Tach

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