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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. | ||
