Error Codelist / Flash Codes

Error Codelist/Flash Codes for 4 Stroke 50cc Euro 4 Scooter 137QMB/139QMB with DELLORTO carburetor / 10 Inch ZNEN GMX 460 Retro Classic / NF Edition / GMX 460 Sport

The system of the scooter works roughly on the principle of over-richness and is controlled by the measurement of the lambda probe. If necessary, the combustion mixture is made leaner through the two air nozzles by adding more air.

The DELLORTO technology includes an intelligent error code system in which errors are signaled by a flashing code on the engine control lamp in the cockpit of your scooter. In the following you will find the explanations of the individual blink codes and information on how to solve the problem. As soon as the fault on the vehicle has been rectified, the control lamp goes out, the fault does not have to be specifically deleted from the system.

1x Flash

• TPS (throttle position sensor) lower than 0,2 volt or higher than 4,8 volt
• TPS (throttle position sensor) not connected, or contact problem (ckeck plug connection)

The throttle position sensor is positioned on the left side of the carburetor, it's a little black box. Here you should pay attention to the white marking, which goes from the TPS over the carburetor (basic setting).

Direct link to the spare part - Carburetor

2x Flash

• Air valve on the carburetor is not connected, or contact problem (check plug connection)
• Air valve on the carburetor is broken (has to be between 70 and 85 Ω)

All connections and hoses should be checked for damage. Both air valves are usually identical.

Direct link to the spare part - Air valve
Direct link to the spare part - Valve Filter

3x Flash

• Engine temperature sensor not connected, or contact problem
• Engine temperature sensor broken (setpoint at 20°C is between 125+/- 6,5 Ω)

(Alternative measurements: -20°C = 955 Ω, 20°C = 125 Ω, 40°C = 55 Ω, 80°C = 12 Ω)

Direct link to the spare part - Temperature sensor

4x Flash

• Lambda probe defective, not connected, or contact problem/li>

Alternatively, this error can also occur if the throttle grip continues to be fully opened while driving after reaching maximum speed. This means that excess gasoline gets into the exhaust and leads to incorrect measurements there. This can be counteracted by turning the throttle twist grip back enough after reaching top speed that the speed is maintained, but the scooter no longer runs at full throttle. This also reduces the scooter's fuel consumption.

Direct link to the spare part - Lambda Probe

5x Flash

• E-Choke defective, not connected, or contact problem

Direct link to the spare part - Carburetor

6x Flash

• Clutch sensor defective, or not connected

This error is only recognized when the engine speed is increased and none or an incorrect signal is received for three seconds.

Direct link to the spare part - Clutch Sensor

In some vehicles, there is no clutch sensor installed in the variator cover, this can be seen from the fact that no cable comes out of the variator cover. Because this error code can still occur in these vehicles. Our experience has shown that in this case most likely the ECU unit is defective.

Direct link to the spare part - ECU 25 km/h

Direct link to the spare part - ECU 45 km/h

If you need help with troubleshooting or installing spare parts / repairing the scooter, you can also conveniently book our mobile service in addition to the spare parts listed above. Then simply give us the vehicle data by e-mail and let us know which work should be carried out so that we can schedule you for an appointment as quickly as possible.

Euro 4 motor scooters, also known as scooters for short, require expert maintenance. Self-proclaimed professionals often think they can make the scooter faster by simply swapping parts. Incorrect components usually lead to damage to sensitive electronic parts, such as the ignition box / ECU from Dellorto. The vehicle then switches to the emergency program and only an expensive repair can help. You should therefore not let every screwdriver turn on, it can be done more wrongly than well.

A target-oriented service is not possible without the necessary training, as well as without software and without the necessary equipment (hardware), so professionals have to work. Only a specialist workshop specializing in Euro 4 brands and China scooters can actually help, we are the right contact for you with our master workshop. We at Motorroller.de are focused on these scooters and vehicles and offer an on-site service for customer service and inspection at your home / workplace, as well as a workshop repair service for customer care, general overhauls and inspections. Pick-up, delivery, towing and breakdown service are also part of our range of services. We offer these services for all Euro 4 China scooters with built-in lambda sensor, temperature sensor, throttle valve sensor, TPS sensor and Dellorto electronic carburetor.

The common scooter and vehicle brands are:
ATU, Benzhou, BTC, Burnout, Baotian, Flex Tech, Alpha Motors, GMX, AGM Motors, GT Union / Capillar, GTS, Herkules, IVA, Junak, Keeway, Kymco, Kreidler, Lambreta, Lexmoto, Luxxon, Nova Motors, Matador, Motowell, Razory, SYM, Turbho, Peugeot, ZNEN, Zündapp, KSR. These brands are equipped with the Euro 4 DELLORTO systems. They all have the error code system described in the short repair guide above for troubleshooting and problem identification so that nothing stands in the way of simple troubleshooting.

You can order the illustrated spare parts conveniently and inexpensively online by clicking on the article image.
Other spare parts, such as You can easily find air filters, starters, cylinders, other engine and frame parts and panels using the spare parts search in the shop.

We also carry out repairs and inspections on vehicles that were not bought directly from us, e.g. B. for motor scooters from Lidl, Aldi, OTTO, Real, Selgros, Neckermann oder auch an sogenannten Baumarktrollern von Praktiker, Bauhaus, OBI, Hornbach, Hagebau.

Please contact us, we are happy to help.

>our Motorroller.de Team