What is the reason for the tachometer not moving after ignition?
1 Answers
The reasons for the tachometer not moving after ignition are foreign objects stuck inside the gauge or a grounding fault in the sensor or the wiring between the sensor and the indicator. The tachometer is generally located inside the instrument panel, symmetrically placed alongside the speedometer. The tachometer operates based on magnetic principles, receiving pulse signals generated when the primary current in the ignition coil is interrupted, and converting this signal into a readable speed value. Below are detailed explanations and solutions for the tachometer not moving after ignition: Grounding fault in the sensor or the wiring between the sensor and the indicator: Check using the wire removal method. Remove the wire from the sensor; if the fuel gauge needle moves to the "I" position, it indicates an internal grounding fault in the sensor or a damaged float. If the needle still points to zero, remove the sensor terminal wire from the fuel gauge. If the instrument needle moves to "I," it indicates a grounding fault in the wiring between the fuel gauge and the sensor. If the needle does not move, it means the fuel gauge is internally damaged or its power line is broken. Foreign objects stuck inside the tachometer: Disassemble the tachometer and remove the foreign objects.
