This is a flowchart to help you check the cause when you experience problems such as your gauge being strange or not working. Please follow the flow to check.
You can also see a list of solutions in the [PDF].
The main causes and solutions are listed in the flowchart, but there may be other causes that are not listed, or other solutions may be necessary. If you find that there is a wiring problem or a sensor/gauge malfunction, please do not try to solve the problem yourself. Instead, please visit the shop that installed it to check the problem and request a repair.The meter needle wobbles unsteadily when idling. This is normal for vehicles with smaller volume of the surge tank, such as light vehicles and compact cars. There is a proposal to increase the capacity of the surge tank.
Also, please check that the turbo sensor or the turbo sensor harness is disconnected or shorted at the edge of the vehicle frame.
Please check the link below additionally.
https://www.defi-shop.com/installation/caution/
The sensor is malfunctioning. Please offer inspection and repair through the dealers of Defi.
Please refer to the cylinder number setting in the instruction manual.
Please check that the vehicle speed/engine signal harness is properly connected to the engine speed signal of the vehicle ECU.
If the vehicle speed/engine RPM signal harness is incorrectly connected to the connector for the meter harness, the ADVANCE control unit will be damaged and stop working.
Replace the oil pressure and fuel pressure sensors at the connector of the control unit and check the operation.
If the oil pressure sensor is faulty, the same symptom will appear in the fuel pressure gauge when the sensor is swapped between fuel pressure and oil pressure.
Also, please check that the sensor or the sensor harness is disconnected or shorted at the edge of the vehicle frame.
Please check the link below additionally.
https://www.defi-shop.com/installation/caution/
It may be damaged by high-pressure pulsation of the oil pump and fail. As a countermeasure to prevent damage from high-pressure pulsation, it is recommended to install an extension with stainless steel mesh hose.
Remove the rust with paying attention not to bent the terminals. Also, place the connector in a location where it is not exposed to water.
“If the temperature sensor is used together, it may be blocking the oil pressure sensor.
Please check the link below for details.
https://www.defi-shop.com/installation/caution/
Please check that the oil pressure sensor or the oil pressure sensor harness is disconnected or shorted at the edge of the vehicle frame.
Please check the link below additionally.
https://www.defi-shop.com/installation/caution/
Replace the oil temperature sensor and the water temperature sensor at the control unit connector and check their operation.
If the oil temperature sensor is faulty, the same symptom will appear in the water temperature gauge when the sensors are swapped between water temperature and oil temperature.The oil temperature sensor or oil temperature sensor harness may be faulty.
Please check the link below additionally.
https://www.defi-shop.com/installation/caution/
Remove the rust with paying attention not to bent the terminals. Also, place the connector in a location where it is not exposed to water.
When attaching a sensor to an attachment, if the tip of the sensor hits the attachment, the tip will be deformed and the internal thermistor will not operate properly.
You can visually compare the sensor with a normal sensor to see if it is deformed.
This problem tends to occur when the oil temperature sensor is attached to the oil pressure hole on the side of the sandwich block.
Please check the link below for details.
https://www.defi-shop.com/installation/caution/
When a water temperature sensor is installed in the upper hose of the radiator, the temperature may suddenly rise to 70 to 80 degrees celsius in 5 to 10 minutes after the engine is started. This is normal operation.
This symptom occurs when the coolant inside the engine warms up and the thermostat opens, causing the coolant to start circulating.
If the sensor does not make contact with the radiator fluid, the water temperature gauge may indicate an abnormal reading.
Install the sensor attachment facing down or sideways.
Please check the link below for details.
https://www.nippon-seiki.co.jp/defi/installation/caution/”
https://www.defi-shop.com/installation/caution/
If the terminals are rusted, the display will not be correct due to the poor contact.
Remove the rust with paying attention not to bent the terminals. Also, avoid locations where water may continue to pour directly on the connectors.
Water may get into the exhaust temperature sensor, causing the display to temporarily become abnormal. Once the water evaporates, the reading mey return to normal.
However, if the water evaporates rapidly, the tip of the sensor may swell and deform, causing complete a malfunction.
Please check that the wiring at the base of the connector is disconnected or shorted.
If you install this product in a vehicle with an illumination control function (which allows you to adjust the brightness of the center console lighting), the ILM wire (white wire) may be connected to the illumination control signal (pulse-like electrical signal).
In this case, depending on the meter model you are using, the light on the dial may flicker.
If the problem does not occur after connecting the ILM wire (white wire) directly to the IGN wire (orange wire) or +B wire (red wire) for example, connect the ILM wire again to a wire that provedes DC 12V when the small lights are on.
Please check that the IGN wire (orange wire), +B wire (red wire), and GND wire (black wire) are connected correctly. The wiring color may differ from the harness on the vehicle.
For example, check that the +B (red) and IGN (orange) wires are not connected to the ACC (red) and ILM (orange) wires on the back of the navigation system.
Also, if the power is not turned off right after the engine is turned off, some car models have an electrical signal that turns off several tens of seconds after the engine is turned off. Please check the IGN wire connection.
Please check that the IGN wire (orange wire), +B wire (red wire), and GND (black wire) are connected correctly.
The wiring colors may differ from the harness on the vehicle side.
Also, if the GND wire (black wire) is connected to the vehicle frame, please check that the frame side is GND.
If the vehicle speed/engine RPM signal harness is incorrectly connected to the connector for the meter harness, the ADVANCE control unit will be damaged and stop working.