MyChron Troubleshooting & Error Codes Guide

AiM MyChron Troubleshooting & Error Messages Guide

This guide covers safe first checks for MyChron5, MyChron5S and MyChron6 symptoms. A symptom heading is not an official displayed error code. Identify the exact model and firmware before following model-specific instructions.

Written by Rex Harris, degree-qualified radio electronics engineer (RSM Approved Radio Engineer ARE127 and Approved Radio Certifier ARC127) with decades of motorsport electronics experience, and Charlie Harris, national-winning kart racer, University of Canterbury engineering student and kart race engineer, at Harris Race Radios™, the Official AiM dealer in New Zealand, supplying genuine AiM Sport products. Contact Rex or Charlie for support →

1. Common symptoms and safe first checks

MyChron will not turn on

Identify the model and use its specified charging equipment and procedure. MyChron5/5S battery arrangements must not be treated as identical to MyChron6 USB-C charging. Inspect accessible connectors, cable and power button for damage without opening the enclosure or forcing a connector. Do not substitute an unspecified charger or rely on a universal 30–60-minute recovery time.

If a battery is swollen, leaking, damaged or unusually hot, stop using and charging it and contact support. For the model-specific procedure, see the battery care and charging guide.

No RPM or an unstable RPM trace

  • Check the pickup installation against AiM's instructions for the exact engine and ignition arrangement.
  • Inspect the accessible lead, connection and insulation, with the engine stopped.
  • Verify the RPM factor for the ignition pulses and crankshaft revolutions.
  • Do not automatically add wraps or apply a universal 5–7-wrap minimum. Follow the model-specific routing and installation procedure.
  • For MyChron6, the documented RPM acquisition options are 20 Hz or 50 Hz. Increasing acquisition rate is not a substitute for correcting interference or an incorrect pickup arrangement.

No temperature or an implausible reading

  • Confirm the exact sensor, measurement type, compatible connector and any required patch lead for the model and 1T/2T configuration.
  • Check channel function and units. Do not assume every model has separate sockets labelled WT and CH.
  • With the engine cool, inspect accessible wiring and the sensor installation for damage or leaks. Follow the exact engine and sensor fitting instructions rather than tightening fittings indiscriminately.
  • Use the engine manufacturer's or engine builder's operating and alarm limits, not a universal temperature table.
  • A jumping reading does not by itself prove the sensor needs replacement. Investigate connection, configuration, interference and installation first.

Stop running if there is overheating, a leak, engine distress or a reading that makes safe operation uncertain.

No GPS reception

MyChron5, MyChron5S and MyChron6 use internal satellite receivers. Do not treat an external GPS08 or GPS05 as a routine installation requirement for these models. Check reception outdoors and consult the exact model's documented satellite-status display. Do not assume one indicator colour or promise a 20–40-second lock time.

If reception remains absent under suitable conditions, record the model, firmware and observed status and contact support. Preserve valid external-receiver procedures only for separately confirmed compatible systems.

Lap times are not recorded

Confirm reception, the intended circuit layout, start/finish and split information, and the model's lap-timing configuration. Use its documented track-management procedure; do not assume every generation has the same menus or transfer route. Ask Harris Race Radios™ for help with missing or incorrect NZ/AU tracks.

2. Displayed messages and error codes

The previous E01–E06 table has been removed because the listed numeric codes and meanings were not verified against official documentation for the exact MyChron models. They must not be used to diagnose a unit.

For an actual warning, photograph the screen and record its exact text or code, model, firmware, connected equipment and when it appeared. Contact Harris Race Radios™ or AiM support to establish the documented meaning and model-specific action. Do not translate a general symptom such as “no RPM” into an official numeric code.

Stop operating where the message accompanies engine distress, unreliable critical temperature data, electrical damage or abnormal battery behaviour. Do not repeatedly reset the dash to bypass a persistent warning.

3. GPS checks

  • Identify the exact MyChron generation and its internal receiver.
  • Check reception conditions and the documented satellite-status information.
  • Confirm the correct track layout and timing reference.
  • Record firmware and symptoms before changing settings or starting an update.

4. RPM checks

  • Confirm the engine-specific pickup fitting and lead routing.
  • Check the RPM factor and accessible connections.
  • Inspect for damaged insulation, heat exposure or interference.
  • Compare plausible values with a known reference before relying on the trace.

5. Temperature checks

  • Match sensor, patch lead and model.
  • Verify units and channel function.
  • Check installation and wiring with the engine cool.
  • Use engine-specific warning and stop limits.

6. Data, memory and firmware

Download important sessions and verify that the files open before deleting data from the dash. MyChron5/5S normally use the supported Wi-Fi download workflow; MyChron6 supports Wi-Fi and USB. Follow the exact model's documented connection and software requirements.

Before a firmware update, confirm the target device and supported update procedure, save important sessions and maintain the required power supply. A firmware update is not an automatic fix for every reception, sensor or power symptom. Seek support if an update fails or a fault persists.

Use the Race Studio 3 Knowledge Hub for software and download workflows.

Frequently asked questions

Why is my MyChron not showing RPM?

Check engine-specific pickup fitting, the connection and RPM factor. Do not automatically add wraps or assume a universal minimum.

Why will my MyChron not get GPS reception?

Check reception conditions and the exact model's satellite-status display. Standard MyChron5, MyChron5S and MyChron6 use internal receivers; an external GPS08 is not a routine requirement.

What does a numeric error code mean?

Record the exact displayed code, model and firmware and contact support. The former E01–E06 table was unverified and must not be used as an official code reference.

Who provides MyChron support in New Zealand?

Contact Rex or Charlie at Harris Race Radios™ for model-specific installation, sensor and fault guidance. MyChron5 owners remain supported with parts, sensors and repairs; MyChron6 is the current new-unit range.

Related guides

AiM MyChron buying guide →

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