What the heck! Fault codes P0571 and P1571

[BertRemington]

Thank you SS.

By the way, Spyder fault codes look like OBD-II codes, but are typically re-assigned to other functions for Spyder specific needs.

From the OBD-II PIDs Wikepedia

Though not mandated, many motorcycles also support OBD-II PIDs.

The Spyder's PIDs follow the style but not the content of "the standard OBD-II PIDs as defined by SAE J1979." Which is why

Simply looking up codes on Google is frequently misleading.

So, you had a low fluid level and did a brake job. Then AFTER the brake job, you got those two codes and are wondering if they can be caused by low fluid level. ... However, those two codes have nothing to do with fluid level.

Two items for a successful pad change:

(1) Changing the rear brake pads requires the rear caliper to be removed which requires the parking brake cable to be disengaged from the caliper in some manner. In no instance should the cable adjustment lock nut be loosened and the adjustment distance changed. Changing the adjustment distance is only required if the cable stretched over time, was replaced or, perhaps, the PBM was replaced. [On a personal note, I replaced the rear caliper (along with new pads) due to the previous owner damaging the piston threads (at 77K miles the front pads were half worn but the rear pads were almost gone) and did not need to adjust the parking brake cable.]

(2) After remounting the caliper, pump the brake pedal until a firm response is obtained and then pump at least 10 more times. You need to remove the slack between the piston and the pads and the rotor and the pads. Only then should you turn on the ignition and operate the parking brake. Otherwise I believe there is the risk of over-rotation in the pulley mechanism.

There isn't much information on the WPM (which is on CANBUS) but I believe it has a torque (ie cable tension) sensor as part of its operating cycle. And this is related to the two P codes.

If the cable adjustment was changed, dig out the Service Manual and follow the procedure for correct adjustment.

 

[BertRemington]

Some notes from my 2014 Service Manual:

PARKING BRAKE DOES NOT WORK

1. Faulty WPM module or wiring.
- Check if windshield works properly.
- Carry out a WPM MODULE SIGNAL CIRCUIT CONTINUITY TEST.

2. Faulty PBS switch or wiring.
- Carry out a PARKING BRAKE SWITCH TEST.

3. Faulty HBS switch or wiring.
- Carry out a PARKING BRAKE LIGHT SWITCH TEST.

4. Faulty parking brake motor or wiring.
- Carry out a PARKING BRAKE MOTOR OPERATION TEST.

5. Wrong parking brake cable adjustment.
- Carry out a PARKING BRAKE CABLE ADJUSTMENT.

======================================================

BRAKE SYSTEM PRESSURE VALIDATION

NOTICE Do not pump up the brake pedal repeatedly before doing the validation.

In B.U.D.S., select Monitoring folder then the VCM page.

Slowly depress the brake pedal (only once) until you reach 3500 kPa (508 PSI) at the brake pressure sensor.
Maintain the brake pedal in position.
Check the Low Pressure Switch button value on the computer screen.

TYPICAL
1. Brake Pressure Sensor (PSI) value
2. Low Pressure Switch button

If Low Pressure Switch button is still off when you reached the required pressure the validation is successful.
If Low Pressure Switch button turns on before reaching 3500 kPa (508 PSI), perform the following additional steps:
Perform equivalent of 3 complete wheels rotation (for the 3 wheels).
Slowly depress the brake pedal until Low Pressure Switch button turns on.
Take note of the Brake Pressure Sensor (PSI) value.
Perform equivalent of 3 complete wheels rotation (for the 3 wheels).
Slowly depress the brake pedal until Low Pressure Switch button turns on.
Take note of the Brake Pressure Sensor (PSI) value.
Perform equivalent of 3 complete wheels rotation (for the 3 wheels).
Slowly depress the brake pedal until Low Pressure Switch button turns on.
Take note of the Brake Pressure Sensor (PSI) value.
Calculate the average of the 3 Brake Pressure Sensor (PSI) values previously noted.
If the average is EQUAL OR ABOVE 3500 kPa (508 PSI), the brake system pressure is conform.
Clear fault codes.

If the average is BELOW 3500 kPa (508 PSI), repeat BRAKE FLUID BLEEDING PROCEDURE with the following deviation:
– Lift the rear of vehicle and adjust master cylinder on level.

Ignoring the BUDS aspect, the theme above is repeatedly testing if the Low Pressure switch is activated (you can hear it click if it does). If it is then a low brake fluid level is a possibility as is trapped air in the brake lines.

 

[BertRemington]

Just found some Spyder DTC information by r.s.wenzel aka member spyderCodes

P0571 WPM HBS switch fault

P1571 WPM HBS switch deactivation fault