EBC 445 ESP

U1003-ESP CAN C BUS PERFORMANCE





For a complete wiring diagram Refer to Diagrams/Electrical.


- When Monitored:
Continuously.

- Set Condition:
One of the CAN messages that is assigned to the basic CAN channel was missed by the CAN driver. This means that the whole system was very slow in responding to the CAN interrupts.







Diagnostic Test


1. DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, clear DTCs in the Anti-lock Brake Module.
Cycle the ignition from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
With the scan tool, select View DTCs in the Anti-lock Brake Module.
Does the DTC reset and/or remain active?

Yes


- Go to 2


No


- Go to 6



2. CAN C BUS DTCs SET IN TOTALLY INTEGRATED POWER MODULE (TIPM)
With the scan tool, select View DTCs in the TIPM.
Are there any active CAN C Bus DTCs?

Yes


- Refer to the Communications test for this DTC and/or Manufacturer Code Charts for further possible causes.


No


- Go to 3
-



3. (D65) CAN C BUS (+) CIRCUIT OPEN




Turn the ignition off.
Disconnect the Anti-lock Brake Module harness connector.
Disconnect the TIPM C6 harness connector.
Measure the resistance of the (D65) CAN C Bus (+) circuit between the Anti-lock Brake Module harness connector and the TIPM C6 harness connector.
Is the resistance above 2.0 ohms?

Yes


- Repair the (D65) CAN C Bus (+) circuit for an open.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test


No


- Go to 4



4. (D64) CAN C BUS (-) CIRCUIT OPEN




Measure the resistance of the (D64) CAN C Bus (-) circuit between the Anti-lock Brake Module harness connector and the TIPM C6 harness connector.
Is the resistance above 2.0 ohms?

Yes


- Repair the (D64) CAN C Bus (-) circuit for an open.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test


No


- Go to 5



5. ANTI-LOCK BRAKE MODULE
Inspect the wiring between the Anti-lock Brake Module harness connector and the TIPM harness connector. If any problems are found, repair as necessary. If no problems are found, view repair.


Repair


- Replace the Anti-lock Brake Module.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test



6. INTERMITTENT ESP CAN C BUS PERFORMANCE DTC
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?

Yes


- Repair as necessary.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test


No


- Test complete.