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techtalk:evo:elec04 [2018/05/14 00:29]
ixl2relax [CANbus - Controller Area Network Bus]
techtalk:evo:elec04 [2018/05/14 00:30]
ixl2relax [CANbus - Controller Area Network Bus]
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 You can test the CANbus to see if the two lines are shorted together. With the __keyswitch off__, place your meter on the ohms scale, and put one probe each on the DLC Pin#1 (White/Red) and DLC Pin#3 (White/​Black). You should read 60-ohms between these CANbus High and CANbus Low connections. If the resistance is less than 50-ohms, you will want to disconnect devices on the CANbus, one at a time, to see which is causing the low reading. Devices should be removed in the following order: Speedometer,​ ECM, LftHandControl,​ RtHandControl,​ Tach and BCM. You can test the CANbus to see if the two lines are shorted together. With the __keyswitch off__, place your meter on the ohms scale, and put one probe each on the DLC Pin#1 (White/Red) and DLC Pin#3 (White/​Black). You should read 60-ohms between these CANbus High and CANbus Low connections. If the resistance is less than 50-ohms, you will want to disconnect devices on the CANbus, one at a time, to see which is causing the low reading. Devices should be removed in the following order: Speedometer,​ ECM, LftHandControl,​ RtHandControl,​ Tach and BCM.
  
-**Test - CANbus High shorted ground:**\\+**Test - CANbus High shorted ​to ground:**\\
 You can test to see if the CANbus High signal line, DLC Pin#1 (White/Red) is shorted to ground. With the __keyswitch off__, place your meter on the ohms scale, and put one probe on the DLC Pin#1 (White/Red) and the other on ground. You should read more than 1000-ohms to ground. If the resistance is less than 1000-ohms, you will want to disconnect devices on the CANbus, one at a time, to see which is causing the low reading. Devices should be removed in the following order: Speedometer,​ ECM, LftHandControl,​ RtHandControl,​ Tach and BCM. If the low reading does not go away, you will need to examine your wiring for the problem. You can test to see if the CANbus High signal line, DLC Pin#1 (White/Red) is shorted to ground. With the __keyswitch off__, place your meter on the ohms scale, and put one probe on the DLC Pin#1 (White/Red) and the other on ground. You should read more than 1000-ohms to ground. If the resistance is less than 1000-ohms, you will want to disconnect devices on the CANbus, one at a time, to see which is causing the low reading. Devices should be removed in the following order: Speedometer,​ ECM, LftHandControl,​ RtHandControl,​ Tach and BCM. If the low reading does not go away, you will need to examine your wiring for the problem.
  
-**Test - CANbus Low shorted power:**\\+**Test - CANbus Low shorted ​to power:**\\
 You can test to see if the CANbus Low signal line, DLC Pin#3 (White/​Black) is shorted to a power line. With the __keyswitch off__, place your meter on the 20v scale, and put your RED probe on the DLC Pin#3 (White/​Black) and the other on ground. You should read 0-volts to ground. If the reading is more than 0-volts, you will want to disconnect devices on the CANbus, one at a time, to see which is causing the voltage reading. Devices should be removed in the following order: Speedometer,​ ECM, LftHandControl,​ RtHandControl,​ Tach and BCM. If the voltage reading does not go away, you will need to examine your wiring for the problem. You can test to see if the CANbus Low signal line, DLC Pin#3 (White/​Black) is shorted to a power line. With the __keyswitch off__, place your meter on the 20v scale, and put your RED probe on the DLC Pin#3 (White/​Black) and the other on ground. You should read 0-volts to ground. If the reading is more than 0-volts, you will want to disconnect devices on the CANbus, one at a time, to see which is causing the voltage reading. Devices should be removed in the following order: Speedometer,​ ECM, LftHandControl,​ RtHandControl,​ Tach and BCM. If the voltage reading does not go away, you will need to examine your wiring for the problem.