C1681 - ABS ECM Internal Error

C1681 - ABS ECM Internal Error - Fault - L*1

Fault Code	Possible cause	Action
C1681	ABS ECM internal error Incorrect wheel speed sensor air gap Damaged or dirty pulser ring Loose or incorrectly installed wheel speed sensor	Ensure ABS modulator/ECM connector is secure. Proceed to pinpoint test 1:

Fault Code

Possible cause

Action

C1681

ABS ECM internal error

Incorrect wheel speed sensor air gap

Damaged or dirty pulser ring

Loose or incorrectly installed wheel speed sensor

Ensure ABS modulator/ECM connector is secure.

Proceed to pinpoint test 1:

Test		Result	Action
1	Measure the air gap of the wheel speed sensors between the sensor and the pulser ring: - Air gap between 0.74 mm to 1.36 mm	OK	Proceed to test 1
Faulty	Rectify the fault and proceed to test 4
2	Check the pulser rings for damage or contamination by road grime or ferrous metal filings.	OK	Proceed to test 2
Faulty	Clean or replace the ABS pulser ring, proceed to test 4
3	Check the wheel speed sensors for correct installation, and the fixings for correct torque.	OK	Proceed to test 4
Faulty	Rectify the fault and proceed to test 4
4	Clear fault code and test ABS to verify fault cleared.	OK	Action complete - quit test
Fault still present	Contact Triumph service