| All values measured to ground unless otherwise noted | |||
| CAN H | CAN-Bus (high side). High speed data transfer bus input and output, shares data with other ECMs | No reliable test. Check continuity to other ECMs. Approx. 5 VAC when data is on bus | Also other ECMs can cause CAN-Bus DTCs |
| CAN L | CAN-Bus (low side). High speed data transfer bus input and output, shares data with other ECMs | Disconnect all CAN plugs from appropriate ECMs, check wiring for insulation resistance > 20 kOhms |
HHT is also used for CAN diagnosis |
| N3/4 | |||
| 3.H 3.L |
CAN-Bus (high side) CAN-Bus (low side) |
ECM disconnected, measure at ECM across 3.H and 3.L approx. 120 Ohms |
|
| N4/1 | |||
| 2.21 2.20 |
CAN-Bus (high side) CAN-Bus (low side) |
ECM disconnected, measure at plug across 2.21 and 2.20 approx. 60 Ohms |
|
| N4/3 | |||
| 2.44 2.45 |
CAN-Bus (high side) CAN-Bus (low side) |
ECM disconnected, measure at plug across 2.44 and 2.45 approx. 60 Ohms |
|
| N47-1 | |||
| 3.H 3.L |
CAN-Bus (high side) CAN-Bus (low side) |
ECM disconnected, measure at plug across 3.H and 3.L approx. 60 Ohms |
|
| N54 | |||
| H L |
CAN-Bus (high side) CAN-Bus (low side) |
ECM disconnected, measure at ECM across H and L approx. 120 Ohms |
|
| N59/1 | |||
| 2.H 2.L |
CAN-Bus (high side) CAN-Bus (low side) |
ECM disconnected, measure at plug across 2.H and 2.L approx. 60 Ohms |
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