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Manuals / EU3 Modification / Contact / Trouble Shooting

User Manuals

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User Manuals
SureShift 2

HTML User Guide
PDF User Handbook (265k)

SureShift SB

HTML User Guide
PDF User Handbook (190k)
Javascript Interactive User Guide (110k)

SmartMax

HTML User Guide
PDF User Handbook (225k)

Technical Guides
Low Voltage
Tachometer

Modification for low voltage tachometer signal (eg Caterham - EU3)


Email Technical Support

Please click here to e-mail your technical support question: techsupport@aceserve.co.uk


Trouble Shooting

Connection to Coil / Tachometer Output

Connection to Coil

Problem Possible Causes Resolution

I cannot get my system to read any RPM value

You have not connected the signal wire to the coil negative terminal

Ensure you have correctly identified the coil negative

You have modified the signal wire and have shorted onto the screen in the wire

When modifying the signal wire carefully strip back the screen and only connect onto the core wire

You do not have a good ground connection

Ensure the ACES system ground is connected directly to the battery negative, or to the same ground location as the ignition system

My system is detecting RPM but the values are erratic

You do not have a reliable ground connection

Ensure the ACES system ground is connected directly to the battery negative, or to the same ground location as the ignition system

You have a multi-spark ignition system and have connected to the negative side of the coil

You can only get a reliable signal from a multi-spark ignition system by connecting to the Tacho output

Manufacturers of multi-spark ignition systems include MSD, Crane & Accel

My system is detecting RPM and the values are stable. However the values I am seeing are incorrect by a factor

The number of cylinders setting has been set up incorrectly for the ignition system in the vehicle

The ACES system assumes that a single coil fires all cylinders on a 4 stroke engine.

Therefore vehicles with a mutilple coil ignition system, a wasted spark ignition system, a Tacho output or having a 2 stroke engine often require that the number of cylinders configured is different to the number of cylinders the engine actually has.

If the ACES system is reading too high RPM - increase the number of cylinders set.

If the ACES system is reading too low RPM - decrease the number of cylinder set.

Connection to a Tachometer Output

Problem Possible Causes Resolution

I cannot get my system to read any RPM value

You have not connected to the correct output from the ECU or ignition module

Refer to the manual for ECU or ignition system and confirm that you have identified the correct output

You have modified the signal wire and have shorted onto the screen in the wire

When modifying the signal wire carefully strip back the screen and only connect onto the core wire

You do not have a good ground connection

Ensure the ACES system ground is connected directly to the battery negative, or to the same ground location as the ignition system

The ECU output is not compatable with the ACES system

(Somes ECU's only produce a low voltage output (eg EU3 system on some Caterhams) - the ACES system needs to "see" a minimum of 8 Volts)

Refer to ECU manual, check output on an oscilliscope to confirm output

Option 1: Fit pull up resistor (typically 10K) between signal wire and a 12v supply (first check with ECU manufacturer that this will not damage the ECU)

Option 2: Increase sensitivity of the SureShift - Click for details

Option 3: Connect directly to coil negative - not suitable for multi spark ignition systems

Option 4: Use HT pick up (call ACES for details) - not suitable for multi spark ignition systems

My system is detecting RPM but the values are erratic

You do not have a good ground connection

Ensure the system ground is connected directly to the battery negative, or to the same ground location as the ignition system

The ECU output is not compatable with the ACES system

(Somes ECU's only produce a low voltage output - the ACES system needs to "see" a minimum of 8 Volts)

Refer to ECU manual, check output on an oscilliscope to confirm output

Option 1: Fit pull up resistor (typically 10K) between signal wire and a 12v supply (first check with ECU manufacturer that this will not damage the ECU

Option 2: Connect directly to coil negative - not suitable for multi spark ignition systems

Option 3: Use HT pick up (call ACES for details) - not suitable for multi spark ignition systems

The Tacho output has failed

Check ACES system with another Ignition system, or use an oscilloscope to check Tacho output

My system is detecting RPM and the values are stable. However the values I am seeing are incorrect by a factor

The number of cylinders setting has been set up incorrectly for the ignition system in the vehicle

The ACES system assumes that a single coil fires all cylinders on a 4 stroke engine.

Therefore vehicles with a mutilple coil ignition system, a wasted spark ignition system, a Tacho output or having a 2 stroke engine often require that the number of cylinders configured is different to the number of cylinders the engine actually has.

If the ACES system is reading too high RPM - increase the number of cylinders set.

If the ACES system is reading too low RPM - decrease the number of cylinder set.

 


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Revision: 1.00 Date: 09.09.2003, Copyright © ACES Limited 2003
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