U0155 ECM-Gauge Control Module( F-CAN malf)

U0155 ECM-Gauge Control Module( F-CAN malf) is related to the problem with the vehicle speed sensor in honda acoord or honda city ivtec. vehicle speed sensor is use to monitor the speed of vehicle, it is installed at the gear block. if the fault code U0155 ECM-Gauge Control Module( F-CAN malf) is appear in the engine control module. check engine light will appear at the cluster meter and speedometer will not work. There are three wire at the vehicle speed sensor (VSS) 1. 12V positive 2. 5V signal 3. ground. vehicle speed sensor work on these wire.

Sometime when this fault code store in the engine control module it is possible that there is no light on cluster meter. At that time the car will only crank, the engine will not start. in this situation check the fuse below the steering fust box, there will be a 10Amp fuse which will blown, replace that fuse than you will see instrument cluster will be come ON the whole light will illuminate on the cluster meter. Now try to start the engine this time engine will start. if the fault code U0155 ECM-Gauge Control Module( F-CAN malf) is still present, try to delete the fault code.

U0155 ECM-Gauge Control Module( F-CAN malf) :

  • Faulty vehicle speed sensor (VSS).
  • damage wiring harness of vehicle speed sensor (VSS).
  • blown fuse.
  • faulty fuse box.
  • also faulty engine control module.

Symptoms of U0155 ECM-Gauge Control Module( F-CAN malf) :

  • Engine light will illuminate on cluster meter.
  • there will be no light on cluster meter.
  • engine will only crank not start.
  • fault code will store in the engine control module.

Solution :

  • check for the blown fuse at the fuse box located below the steering.
  • Repair damage wiring harness of vehicle speed sensor.
  • replace faulty vehicle speed sensor.
  • check the signal wire of VSS sensor coming out from the engine control module.
  • replace faulty engine control module.

How to trouble shoot U0155 :

In some cases this problem can be solve by replacing the blown fuse at the fuse box located below the steering. sometime it can be different to solve this problem as it is related to the speedometer gauge. (speedometer works on the basis of signal coming from the engine control module. engine control module provide reference voltage to the vehicle speed sensor(VSS). ECU monitor varying in this reference voltage and send output to the speedometer gauge).

If the fault does not solve after replacing blown fuse, check the reference voltage coming out from ECU to the VSS. check the condition of the VSS by taking it out, observe it very clearly for any damage or corrosion on the surface of the sensor. if the wiring harness, supply voltage and reference voltage is good then replace the VSS sensor.

If found that the wiring of the vehicle speed sensor is break. joint the wire of VSS sensor very carefully as the signal wire coming out from ECU. if any short circuit will happen there is a chance that ECU may fail due to that short circuit. always remember that whenever you are going to repair the broken wiring harness disconnect the battery wire. before repairing or rejoining the wire of any sensor at the engine compartment. As all the sensors are connected to the engine control module, so if any short circuit take place while repairing or rejoin the wire of any sensor can lead to short circuit in the ECU.

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