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techtalk:evo:elec04 [2018/05/14 00:30] ixl2relax [CANbus - Controller Area Network Bus] |
techtalk:evo:elec04 [2018/05/14 00:35] ixl2relax [CANbus - Controller Area Network Bus] |
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| **Test - CANbus normal voltage:**\\ | **Test - CANbus normal voltage:**\\ | ||
| - | With the keyswitch on, you can connect a meter (set for 20v readings) between Pin#1 (White/Red), or Pin#3 (White/Black), and ground to test for the 2.5v, which would be a normal reading on these lines. | + | With the keyswitch on, you can connect a meter (set for 20v readings) between Pin#1 (White/Red), or Pin#3 (White/Black), and ground to test for the 2.5v, which would be a normal reading on these lines. If either line reads lower than 1.25v or higher than 3.75v, you may have a malfunctioning device or a short somewhere. |
| **Test - CANbus shorted together:**\\ | **Test - CANbus shorted together:**\\ | ||
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| **Test - CANbus High shorted to power:**\\ | **Test - CANbus High shorted to power:**\\ | ||
| - | With the keyswitch on, you can connect a meter (set for 20v readings) between Pin#1 (White/Red) and ground. If the voltage is higher than 4v on CANbus High, you may have a short to voltage somewhere. By turning the keyswitch off, then removing one component from the CANbus, then turning the keyswitch back on, you can test to see if the voltage on DLC Pin#1 has normalized because you removed a malfunctioning CANbus component. Devices should be removed in the following order: Speedometer, ECM, LftHandControl, RtHandControl, Tach - If DLC Pin#1 has not normalized, then, with the keyswitch off, reconnect the ECM & disconnect power to the BCM, then disconnect the main connector from the BCM, then turn the keyswitch on and test the DLC pin again - If now normalized, the BCM is suspect. | + | With the keyswitch on, you can connect a meter (set for 20v readings) between Pin#1 (White/Red) and ground. If the voltage is higher than 4v on CANbus High, you may have a short to voltage somewhere. By turning the keyswitch off, then removing one component from the CANbus, then turning the keyswitch back on, you can test to see if the voltage on DLC Pin#1 has normalized because you removed a malfunctioning CANbus component. |
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| + | Be sure to turn the keyswitch off when connecting or disconnecting devices. Devices should be removed in the following order: Speedometer, ECM, LftHandControl, RtHandControl, Tach - If DLC Pin#1 has not normalized, then, with the keyswitch off, reconnect the ECM & disconnect power to the BCM, then disconnect the main connector from the BCM, then turn the keyswitch on and test the DLC pin again - If now normalized, the BCM is suspect. | ||
