Fiat LSFT (7-Z0140) Project

7.1.1 Extended format message compatibility

To establish communication on the CAN bus then use the test instrument to transmit a single extended format 8 data byte message (29 bit ID).

Check that the DUT returns an acknowledgment in the message (ACK slot =dominant) and cannot send error messages.

7.2.1 Recessive signal voltage levels

To measure the CAN bus signal recessive state signal voltage levels and check that the level meet the specifications.

Observe the scope data should be in the below ranges.

1. VCAN_H < 0.3V

2. VCAN_L > 4.45V

3. -5.25 < Voutput_diff < -4.15V

7.2.2 Dominant signal voltage levels

To measure the CAN bus signal dominant state signal voltage levels and check that the level meet the specifications.

Observe the scope data should be in the below ranges.

1. VCAN_H > 3.35V

2. VCAN_L < 1.4V

3. 1.95 < Voutput_diff < 5.25V

7.4 Minimum and maximum power level for communication via bus

To measure the minimum and maximum power voltage threshold for correct bus communication.

The DUT must be able to transmit and receive messages in a power range equal to: 6V < Vsupply < 18V

The DUT must resume communication on the bus when the power returns to ≥ 6.5 V.

When the power returns to ≥ 6.5 V, the DUT must resume operation by Tinit

7.5 Engine cranking power voltage curve

To test whether the startup procedure is run correctly during voltage drops

For devices which must be able to communicate during cranking:

1.After eliminating the interference and when power returns to ≥ 6.5V, the DUT must resume operation by TINIT ms.

2.After eliminating the interference and when power returns to ≥ 9V, the DUT must resume operation by TINIT ms.

7.6 Bit rising edge and falling edge times

To check whether the bit rising/falling edge times comply with Std. 07324 [HWCAN] considering the recessive-to-dominant transition.

The measured time must be in the specified limit:

0.25 μs < Trise < 4.5 μs

0.25 μs < Tfall < 4.5 μs

7.7 Signal features

To check symmetry of both CAN bus signals in different physical load conditions.

1. No asymmetric behavior or oscillations must occur

2. During the first half of the bit time, the bus output level must be comprised in the range from 81% to 150% of the DC value at the end of the bit.

3. During the second half of the bit time, the bus output level must be comprised in the range from 95% to 105% of the DC value at the end of the bit.

4. No asymmetric behavior or oscillations must occur

5. During the first half of the bit time, the bus output level must be comprised in the range from 81% to 150% of the DC value at the end of the bit.

6. During the second half of the bit time, the bus output level must be comprised in the range from 95% to 105% of the DC value at the end of the bit.

7.8 Bit time precision during message transmission

To measure the bit time precision during DUT message transmission on CAN bus.

Note: The configured message should have maximum DLC and also fixed data bytes value as per specification.

The maximum allowed oscillator deviation is 0.4%.

7.9.1 Ground potential deviation immunity test - No anomalies

To determine ground potential deviation immunity

7.9.1 Positive Ground Offset

Expose DUT to ground offset levels up to 4.5V

The DUT must be running (the device must be capable of transmitting and receiving data) during the applied ground offset of 1.5V.

The DUT is able to communicate via the bus without errors to Vgndoffset.

7.9.1 Negative Ground Offset

Expose DUT to ground offset levels up to -4.5V

The DUT must be running (the device must be capable of transmitting and receiving data) during the applied ground offset of 1.5V.

The DUT is able to communicated via the bus without errors to Vgndoffset.

7.9.2 Ground potential deviation immunity test - Anomalies

To determine ground potential deviation immunity.

7.9.2 Pos Ofst CAN_L Open

To determine ground potential when CAN_L is open (Pos Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to 4.5V.

7.9.2 Neg Ofst CAN_L Open

To determine ground potential when CAN_L is open (Neg Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to -4.5V.

7.9.2 Pos Ofst CAN_H Open

To determine ground potential when CAN_H is open (Pos Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to 4.5V.

7.9.2 Neg Ofst CAN_H Open

To determine ground potential when CAN_H is open (Neg Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to -4.5V.

7.9.2 Pos Ofst CAN_L Short to Batt

To determine ground potential when CAN_L is Short to Batt (Pos Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to 4.5V.

7.9.2 Neg Ofst CAN_L Short to Batt

To determine ground potential when CAN_L is Short to Batt (Neg Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to -4.5V.

7.9.2 Pos Ofst CAN_H Short to Batt

To determine ground potential when CAN_H is Short to Batt (Pos Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to 4.5V.

7.9.2 Neg Ofst CAN_H Short to Batt

To determine ground potential when CAN_H is Short to Batt (Neg Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to -4.5V.

7.9.2 Pos Ofst CAN_L Short to Gnd

To determine ground potential when CAN_L is Short to Gnd (Pos Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to 4.5V.

7.9.2 Neg Ofst CAN_L Short to Gnd

To determine ground potential when CAN_L is Short to Gnd (Neg Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to -4.5V.

7.9.2 Pos Ofst CAN_H Short to Gnd

To determine ground potential when CAN_H is Short to Gnd (Pos Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to 4.5V.

7.9.2 Neg Ofst CAN_H Short to Gnd

To determine ground potential when CAN_H is Short to Gnd (Neg Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to -4.5V.

7.9.2 Pos Ofst CAN wires shorted

To determine ground potential when CAN_H & L is Shorted (Pos Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to 4.5V.

7.9.2 Neg Ofst CAN wires shorted

To determine ground potential when CAN_H & L is Shorted (Neg Ofst)

Observe the DUT at Vbat=13.5V.

Expose DUT to ground offset levels up to -4.5V.

7.10.1 Short-circuit test

To determine the robustness of the node short-circuited to battery and ground.

7.10.1 CAN_L Short to +27V

To determine the robustness of the node short-circuited to battery for CAN-L to +27V

To check that the DUT does not cause communication interference and must not be damaged during the test.

7.10.1 CAN_H Short to +27V

To determine the robustness of the node short-circuited to battery for CAN-H to +27V

To check that the DUT does not cause communication interference and must not be damaged during the test.

7.10.1 CAN_L Short to 0V

To determine the robustness of the node short-circuited to battery for CAN-L to 0V

To check that the DUT does not cause communication interference and must not be damaged during the test.

7.10.1 CAN_H Short to 0V

To determine the robustness of the node short-circuited to battery for CAN-H to 0V

To check that the DUT does not cause communication interference and must not be damaged during the test.

7.10.1 CAN_L Short to -27V

To determine the robustness of the node short-circuited to battery for CAN-L to -27V

To check that the DUT does not cause communication interference and must not be damaged during the test.

7.10.1 CAN_H Short to -27V

To determine the robustness of the node short-circuited to battery for CAN-H to -27V

To check that the DUT does not cause communication interference and must not be damaged during the test.

7.10.2 CAN wires short-circuit test

To determine failure tolerance in event of short-circuit between CAN wires.

Observe the short-circuit between CAN wires for approximately 1 min.

Check that the DUT maintains the communication up.

7.10.3 Open circuit test

To determine failure tolerance in the event of a CAN wire open circuit.

7.10.3 Open ckt test CAN_L Open

To determine failure tolerance in the event of a CAN-L wire open circuit.

Observe the CAN L wire and leave it disconnected for 1 min and reconnected the CAN L wire.

Observe the CAN H wire and leave it disconnected for 1 min.

Check that the DUT maintains the communication up.

7.10.3 Open ckt test CAN_H Open

To determine failure tolerance in the event of a CAN-H wire open circuit.

Observe the CAN L wire and leave it disconnected for 1 min and reconnected the CAN L wire.

Observe the CAN H wire and leave it disconnected for 1 min.

Check that the DUT maintains the communication up.