Pinpoint Test D : C2005:77, C2006:77

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

D1 CHECK FOR OTHER ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON.

Using a diagnostic scan tool, carry out the ABS module self-test.

Is DTC C2005:74 or C2006:74 present?

Yes	DIAGNOSE DTC C2005:74 or C2006:74 before diagnosing DTC C2005:77 or C2006:77. GO to Pinpoint Test C

No	If DTC C2005:77 or C2006:77 is present, GO to D2 For all other ABS module Diagnostic Trouble Codes (DTCs), GO to the DTC Chart: Anti-Lock Brake System (ABS) Module .

D2 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Disconnect ABS module C135 .

Disconnect the suspect parking brake actuator motor electrical connector.

For the LH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4478-1	Courtesy of FORD MOTOR COMPANY	Ground
C4478-2	Courtesy of FORD MOTOR COMPANY	Ground

For the RH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4479-1	Courtesy of FORD MOTOR COMPANY	Ground
C4479-2	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to D3

No	REPAIR the circuit.

D3 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER

For the LH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4478-1	Courtesy of FORD MOTOR COMPANY	C4478-2

For the RH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4479-1	Courtesy of FORD MOTOR COMPANY	C4479-2

Is the resistance greater than 10, 000 ohms?

Yes

GO to D4

No	REPAIR the circuit.

D4 CHECK THE ACTUATOR MOTOR CIRCUITS FOR AN OPEN

For the LH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4478-1	Courtesy of FORD MOTOR COMPANY	C135-12
C4478-2	Courtesy of FORD MOTOR COMPANY	C135-13

For the RH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4479-1	Courtesy of FORD MOTOR COMPANY	C135-3
C4479-2	Courtesy of FORD MOTOR COMPANY	C135-2

Are the resistances less than 3 ohms?

Yes

GO to D5

No	REPAIR the circuit.

D5 CHECK THE ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE

NOTE: Performing this step sets Diagnostic Trouble Codes (DTCs) in the ABS module.

Ignition ON.

For the LH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4478-1	Courtesy of FORD MOTOR COMPANY	Ground
C4478-2	Courtesy of FORD MOTOR COMPANY	Ground

For the RH actuator motor, measure:

Positive Lead	Measurement / Action	Negative Lead
C4479-1	Courtesy of FORD MOTOR COMPANY	Ground
C4479-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to D6

D6 INSPECT THE ACTUATOR MOTOR FOR EVIDENCE OF BRAKE FLUID OR WATER LEAKS

Ignition OFF.

Remove the parking brake actuator motor. REFER to:Parking Brake Actuator Motor .

Inspect the actuator motor and brake caliper for evidence of brake fluid leaks or water egress.

Is there any evidence of brake fluid leaks or water egress?

Yes	If evidence of water egress is found, IDENTIFY and REPAIR the root cause. If evidence of a break fluid leak is found, INSTALL a new brake caliper and parking brake actuator motor assembly. REFER to:BRAKE CALIPER .

GO to D7

D7 INSPECT THE BRAKE CALIPER FOR BRAKE FLUID LEAKS
- Clean any dirt or residue from the brake caliper.
- Apply and release the brake pedal.
- Inspect the brake caliper for signs of brake fluid leaks.
Are there any signs of brake fluid leaks?

Yes INSTALL a new rear brake caliper and parking brake actuator motor. REFER to:BRAKE CALIPER .

No INSTALL a new parking brake actuator motor. REFER to:Parking Brake Actuator Motor .