U0019-CAN B BUS
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
The TIPM detects an open, a short high, a short low or a short together in either of the CAN B Bus circuits.
| Possible Causes |
| (D55) CAN B BUS (+) CIRCUIT OPEN |
| (D54) CAN B BUS (-) CIRCUIT OPEN |
| (D55) CAN B BUS (+) CIRCUIT SHORTED TO VOLTAGE |
| (D54) CAN B BUS (-) CIRCUIT SHORTED TO VOLTAGE |
| (D55) CAN B BUS (+) CIRCUIT SHORTED TO GROUND |
| (D54) CAN B BUS (-) CIRCUIT SHORTED TO GROUND |
| (D55) CAN B BUS (+) CIRCUIT SHORTED TO (D54) CAN B BUS (-) CIRCUIT |
| ANY CAN B BUS MODULE |
Diagnostic Test
1. TEST FOR INTERMITTENT CONDITIONNOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
Turn the ignition on.
With the scan tool, record and erase TIPM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active TIPM 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 TIPM
Gain access to the Totally Integrated Power Module C3 harness connector, but do not disconnect.
Backprobe and measure the voltage on both the (D55) CAN B Bus (+) and the (D54) CAN B (-) circuits.
Does the voltage read approximately 4.65 - 4.98 volts on the (D54) CAN B Bus (-) and 0.39 - 0.46 volts on the (D55) 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. (D55) 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 (D54) CAN B Bus (-) circuit at the TIPM C3 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 (D55) CAN B Bus (+) circuit for an open.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 4
4. (D54) 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 (D55) CAN B Bus (+) circuit at the TIPM C3 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 (D54) CAN B Bus (-) circuit for an open.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Inspect the wiring and connectors for damage. If ok, replace and program the Totally Integrated Power Module in accordance with the service information. Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
5. (D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the TIPM C3 harness connector.
Turn the ignition on.
Measure the voltage between the (D55) 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, in accordance with the service information, 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 (D55) CAN B Bus (+) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go To 6
6. (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE
Measure the voltage between the (D54) 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, in accordance with the service information, 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 (D54) CAN B Bus (-) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Inspect the wiring and connectors for damage. If ok, replace and program the Totally Integrated Power Module in accordance with the service information. Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
7. (D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the TIPM C3 harness connector.
Measure the resistance between ground and the (D55) 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, in accordance with the service information, 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 (D55) CAN B Bus (+) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
8. (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (D54) 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 Totally Integrated Power Module in accordance with the service information. Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
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, in accordance with the service information, 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 (D54) CAN B Bus (-) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
9. (D55) CAN B BUS (+) CIRCUIT SHORTED TO THE (D54) CAN B BUS (-) CIRCUIT
Turn the ignition off.
Disconnect the TIPM C3 harness connector.
Measure the resistance between the (D55) CAN B Bus (+) circuit and (D54) 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, in accordance with the service information, 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 (D55) CAN B Bus (+) circuit for a short to the (D54) CAN B Bus (-) circuit.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Inspect the wiring and connectors for damage. If ok, replace and program the Totally Integrated Power Module in accordance with the service information. Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).