Clarion RS10 Bedienerhandbuch PDF herunterladen (Seite 9)

128

UNGO – Application Notes

Obtaining a Tachometer Reference

Signal

The tachometer reference signal is an essential

signal for the safe operation of a remote start

system. This signal informs the remote start

module that the vehicle has successfully started

and is running. It can also determine whether the

vehicle is idling at a safe RPM level. In the event

the vehicles idle is racing or below safer operating

level, the remote start module will shut down.

To test for a tachometer wire, a multi-meter

capable of test AC voltage must be used. The

tachometer wire will show between 1V and

6V AC. In multi-coil systems, the system can

learn individual coil wires. Individual coil wires

in a multi-coil ignition system will register lower

amounts of AC voltage. Also, if necessary, the

system can use a fuel injector control wire for

engine speed sensing. Common locations for

a tachometer wire are at the ignition coil, back

of the gauge cluster, engine computers, and

automatic transmission computers.

How to Find a Tachometer Wire with a Multi-

Meter:

1. Set the multi-meter to ACV or AC voltage (12V

or 20V is fine)

2. Attach the (-) probe of the meter to chassis

ground.

3. Start the vehicle and allow it to reach its normal

idle speed.

4. Probe the wire you suspect of being the

tachometer wire with the red probe of the meter.

5. If it’s the correct wire the meter will read

between 1V and 6V.

Multi-Coil Systems:

1. Examine the individual coils and determine

which wires are common on each coil. (Example:

2002 Chevy Pick-up: Each coil has 4 wires, three

common wires on each coil and the 4th wire

changes.)

2. The “different” colored wire can be used for the

tachometer reference signal for the remote start

module. (Only one coil wire is necessary.)

3. Teach tachometer reference signal to the

remote start module.

It is highly recommended to solder this connec-

tion, due to the heat generated inside the engine

bay. Using t-taps or scotch-locks are likely to fail

due to the heat.

Fuel Injector Wire:

1. Examine the individual fuel injectors and deter-

mine which wire(s) are common on each fuel

injector.

2. The “different” colored wire can be used for

the tachometer reference signal for the remote

start module. (Only one fuel injector wire is

necessary.)

3. Teach tachometer reference signal to the

remote start module.

It is highly recommended to solder this connec-

tion, due to the heat generated inside the engine

bay. Using t-taps or scotch-locks are likely to fail

due to the heat.

Tachometer Reference Options

Tachless

If programmed to the voltage sense setting, the

unit will crank the starter for a preset time during.

Once the starter has been engaged, the system

will check the voltage level to verify the engine is

running.

When using tachless operation, it is essential to

determine the correct crank time to prevent dam-

age to the starter. It may take several remote start

activations to determine the crank time.

Some vehicles have many accessories, which are

turned on during remote start activation. In these

vehicles, the variation of voltage between the

engine off and the vehicle running is very slight

and the remote start module may “think” the vehi-

cle has not started. This can cause the remote

start module to shut down after the vehicle has

been started. If this is the case, the Voltage

Check Level must be set to the LOW position.

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