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Home >> Freightliner Truck >> 2008 >> Sprinter 2500 V6-3.0L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Communications - Verbose Codes >> CAN B BUS

CAN B BUS







CAN B BUS





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

- Set Condition:
The BCM detects an open, a short high, a short low or a short together in either of the CAN B Bus circuits.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase BCM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTC's.
Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

2. MEASURE VOLTAGE AT BCM
Gain access to the Body Control Module C6 harness connector, but do not disconnect.
Backprobe and measure the voltage on both the CAN B Bus (+) and the CAN B (-) circuits.
Does the voltage read approximately 4.65 - 4.98 volts on the CAN B Bus (-) and 0.39 - 0.46 volts on the CAN B (+) circuits?

Yes

- Go To 3

No - Voltage Between 0.3 - 0.7 Volts on Both Circuits

- Go To 9

No - Voltage Reads 0 Volts on Either Circuit

- Go To 7

No - Voltage Above 10 Volts on Either Circuit

- Go To 5

3. CAN B BUS (+) CIRCUIT OPEN




Turn the ignition on.
With the scan tool select ECU View.
Using a fused jumper wire, connect one end to ground and with the other end backprobe the CAN B Bus (+) circuit at the BCM C6 harness connector.

NOTE: A red "X" will appear next to modules that can no longer communicate on the Bus.

Did a red "X" appear next to any modules on the scan tool?

Yes

- Using the Wiring Diagrams to further isolate the open in the circuit, repair the CAN B Bus (+) circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Go To 4

4. CAN B BUS (-) CIRCUIT OPEN




With the scan tool select ECU View.
Using a fused jumper wire, connect one end to ground and with the other end backprobe the CAN B Bus (-) circuit at the BCM C6 harness connector.

NOTE: A red "X" will appear next to modules that can no longer communicate on the Bus.

Did a red "X" appear next to any modules on the scan tool?

Yes

- Using the Wiring Diagrams to further isolate the open in the circuit, repair the CAN B Bus (-) circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Inspect the wiring and connectors for damage. If ok, replace and program the Front Control Module.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

5. CAN B BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE




Turn the ignition off.
Disconnect the Body Control Module C6 harness connector.
Turn the ignition on.
Measure the voltage between the CAN B Bus (+) circuit and ground.
Is the voltage above 10.0 volts?

Yes

- Disconnect each CAN B Bus module one at a time while observing the voltage to determine if the short is caused by an internal short within a module. Replace the module,, that when disconnected eliminates the short to voltage. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the CAN B Bus (+) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Go To 6

6. CAN B BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE




Measure the voltage between the CAN B Bus (-) circuit and ground.
Is the voltage above 10.0 volts?

Yes

- Disconnect each CAN B Bus module one at a time while observing the voltage to determine if the short is caused by an internal short within a module. Replace the module,, that when disconnected eliminates the short to voltage. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the CAN B Bus (-) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Inspect the wiring and connectors for damage. If ok, replace and program the Body Control Module.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

7. CAN B BUS (+) CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Measure the resistance between ground and the CAN B Bus (+) circuit.
Is the resistance above 1000.0 ohms?

Yes

- Go To 8

No

- Disconnect each CAN B Bus module one at a time while observing the resistance to determine if the short is caused by an internal short within a module. Replace the module,, that when disconnected eliminates the short to ground. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the CAN B Bus (+) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

8. CAN B BUS (-) CIRCUIT FOR A SHORT TO GROUND




Measure the resistance between ground and the CAN B Bus (-) circuit.
Is the resistance above 1000.0 ohms?

Yes

- Inspect the wiring and connectors for damage. If ok, replace and program the Body Control Module.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Disconnect each CAN B Bus module one at a time while observing the resistance to determine if the short is caused by an internal short within a module. Replace the module,, that when disconnected eliminates the short to ground. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the CAN B Bus (-) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

9. CAN B BUS (+) CIRCUIT SHORTED TO THE (D54) CAN B BUS (-) CIRCUIT




Measure the resistance between the CAN B Bus (+) circuit and CAN B Bus (-) circuit.
Is any resistance present?

Yes

- Disconnect each CAN B Bus module one at a time while observing the resistance to determine if the short is caused by an internal short within a module. Replace the module,, that when disconnected eliminates the short between the two circuits. If the short condition is still present with all CAN B Bus modules disconnected use the Wiring Diagrams to help isolate and repair the CAN B Bus (+) circuit for a short to the CAN B Bus (-) circuit.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

No

- Inspect the wiring and connectors for damage. If ok, replace and program the Body Control Module.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests.

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