| All values measured to ground unless otherwise noted | |||
| Z37/2, Z37/3 |
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| Z37/2 | CAN Class C bus (low side). High speed data transfer bus input and output, exchanges data with other ECMs | No reliable test. Check continuity to other ECMs. Approx. 5 VAC when data is on bus | Also ECMs can cause CAN-Bus DTCs |
| Z37/3 | CAN Class C bus (high side). High speed data transfer bus input and output | Disconnect all CAN plugs from appropriate ECMs, measure between Z37/2 and Z37/3 > 20 kOhms. ECM internal resistance with plugs disconnected N3/10 pins D11 and D12 approx. 120 Ohms |
See also Z37/2 HHT is also used for CAN diagnosis |
| Note 1 | N73 is gateway for data exchange between CAN Class C and Class B bus. Refer to PE00.19-U-2300C for CAN Class B bus |
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