Ford Workshop Service and Repair Manuals > Transit 2006.5 (04.2006-) > Mechanical Repairs | 2 Chassis | 206 Brake System | 206-05B Parking Brake and Actuation - Vehicles With: Parking Brake Assist | Description and Operation | Diagnosis and Testing

General Procedures > < Parking Brake

Parking Brake and Actuation - Vehicles With: Parking Brake Assist - Parking Brake

Transit 2006.5 (04/2006-)

Diagnosis and Testing

Refer to Wiring Diagrams Section 206-05, for schematic and connector information.

General Equipment

73III Automotive Meter (105-R0057) or equivalent

Worldwide Diagnostic System (WDS) (418-F224)

Inspection and Verification

Verify the customer concern.

Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Mechanical	Electrical
Parking brake control Parking brake cable(s) Parking brake actuator Brake linings	Fuse(s) 25A fuse - situated in SVO fusebox Bulb Electrical connector(s) Wiring harness Wheel speed sensor Parking brake switch Parking brake actuator Parking brake module Instrument cluster

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

NOTE:The Parking brake assist data link connector (DLC) wiring harness (orange connector) must be connected into the vehicle data link connector before entering any menus on the diagnostic tool. The diagnostic tool connector must be connected to the parking brake assist DLC.

Connect the diagnostic tool to the parking brake assist DLC (as shown in the detail above).
1. Vehicle DLC
1. Parking brake assist wiring harness link
1. Parking brake assist DLC

If the cause is not visually evident, select the vehicle to be tested from the diagnostic tool menu.

If the DTCs retrieved are related to the concern, go to Parking Brake Assist Diagnostic Trouble Code (DTC) Index.

If no DTCs related to the concern are retrieved, proceed to the Symptom Chart.

Parking Brake Assist Diagnostic Trouble Code (DTC) Index

DTC	Description	Source	Action
C1308	Parking brake wheel speed sensor wire(s) short to ground	Parking brake module	GO to Pinpoint Test E.
C1309	Parking brake wheel speed sensor wire(s) shorted together	Parking brake module	GO to Pinpoint Test F.
C1518	Red fault warning lamp indicator short to battery	Parking brake module	REFER to WDS.
C1519	Red fault warning lamp indicator circuit failure	Parking brake module	GO to Pinpoint Test D.
C1784	Parking brake actuator output short to ground	Parking brake module	REFER to WDS.
C1785	Parking brake actuator output open circuit	Parking brake module	REFER to WDS.
C1786	Parking brake actuator output battery short to ground	Parking brake module	REFER to WDS.
C1799	Hall effect circuit failure	Parking brake module	REFER to WDS.
C1801	Parking brake engage current reached before full apply travel distance	Parking brake module	REFER to WDS.
C1802	Parking brake engage current not reached or traveled too far upon apply	Parking brake module	REFER to WDS.
C1803	Parking brake disengage full travel distance not reached upon release	Parking brake module	REFER to WDS.
B1317	Battery voltage high	Parking brake module	REFER to WDS.
B1318	Battery voltage low	Parking brake module	REFER to WDS.
B1342	Parking brake module is defective	Parking brake module	INSTALL a new parking brake module. REFER to Parking Brake Module - in this section. TEST the system for normal operation.
$A477	Module configuration failure	Parking brake module	REFER to WDS.
U1262	Communication bus failure	Parking brake module	REFER to WDS.

Symptom Chart

Symptom	Possible Sources	Action
No communication with the parking brake module	* Parking brake assist DLC wiring harness.	* Make sure the parking brake assist DLC wiring harness (orange connector) is connected into the vehicle data link connector. The diagnostic tool connector must be connected to the parking brake assist DLC.
No communication with the parking brake module	* Circuit(s). * Parking brake module.	* GO to Pinpoint Test A.
The parking brake will not apply	* Parking brake control. * Parking brake cable(s). * Circuit(s). * Parking brake module. * Parking brake actuator.	* GO to Pinpoint Test B.
The parking brake will not release	* Parking brake cable(s) adjustment.	* REFER to Parking Brake Cable Adjustment - in this section.
The parking brake will not release	* Parking brake control. * Parking brake cable(s). * Circuit(s). * Parking brake module. * Parking brake actuator.	* GO to Pinpoint Test C.
The parking brake assist warning lamp is inoperative	* Circuit(s). * Parking brake switch. * Instrument cluster. * Parking brake module.	* GO to Pinpoint Test D. .
The parking brake warning lamp is flashing fast	* DTC(s) present.	* Go to Parking Brake Assist Diagnostic Trouble Code (DTC) Index.
The parking brake warning lamp is flashing slowly	* Parking brake calibration. * Parking brake module.	* REFER to Parking Brake Cable Adjustment - in this section.
The parking brake warning lamp is continuously on	* Parking brake control applied.	* Release the parking brake control.
	* Fluid level.	* FILL the system to specification. CHECK for leaks.
	* Circuit(s). * Parking brake module.	* Go to Parking Brake Assist Diagnostic Trouble Code (DTC) Index.

Pinpoint Tests

NOTE:Use a digital multimeter for all electrical measurements.

NOTE:Make sure that the parking brake assist is calibrated each time the battery or module is disconnected.
REFER to Parking Brake Cable Adjustment - in this section.

NOTE:When carrying out any measurements on the parking brake module make sure connector C7051b is disconnected before C7051a. Failure to follow this instruction will result in DTC(s) being stored. This could also cause the parking brake assist system to not operate correctly.

NOTE:All measurements on parking brake module connector C7051a must be done before the parking brake module enters the sleep mode, approximately five minutes after the ignition switch is turned to 0 position or the parking brake module is disconnected.

PINPOINT TEST A : NO COMMUNICATION WITH THE PARKING BRAKE MODULE

TEST CONDITIONS DETAILS/RESULTS/ACTIONS

A1: CHECK THE PARKING BRAKE MODULE FOR VOLTAGE

1

Ignition switch in position 0.

2

Disconnect Parking Brake Module C7051b.

3

Measure the voltage between the parking brake module C7051b pin 1, circuit 29-XL1 (OG/BU), harness side and ground.

Is the voltage greater than 10 volts?

Yes

GO to A3.

No

GO to A2.

A2: CHECK CIRCUIT 29-XL1 (OG/BU) FOR OPEN

1

Disconnect SVO fusebox C7052.

2

Measure the resistance between the parking brake module C7051b pin 1, circuit 29-XL1 (OG/BU), harness side and SVO fusebox C7052 pin 1, circuit 29-DG8 (OG/BU), harness side.

Is the resistance less than 5 ohms?

Yes

GO to A3.

No

REPAIR the circuit. TEST the system for normal operation.

A3: CHECK THE PARKING BRAKE MODULE FOR SWITCHED VOLTAGE

1

Disconnect Parking Brake Module C7051a.

2

Ignition switch in position II.

3

Measure the voltage between the parking brake module C7051a pin 5, circuit 14-XL2 (VT/BU), harness side and ground.

Is the voltage greater than 10 volts?

Yes

GO to A5.

No

GO to A4.

A4: CHECK CIRCUIT 14-XL2 (VT/BU) FOR OPEN

1

Disconnect In-Line Fuse Holder C7055.

2

Measure the resistance between the parking brake module C7051a pin 5, circuit 14-XL2 (VT/BU), harness side and In-Line fuse holder C7055, circuit 15-FA5E (GN/BU), harness side.

Is the resistance less than 5 ohms?

Yes

GO to A5.

No

Repair the circuit. TEST the system for normal operation.

A5: CHECK THE PARKING BRAKE MODULE FOR GROUND

1

Measure the resistance between the parking brake module C7051b pin 4, circuit 31-XL1 (BK), harness side and ground.

Is the resistance less than 5 ohms?

Yes

GO to A6.

No

REPAIR circuit 31-XL1 (BK). TEST the system for normal operation.

A6: CHECK CIRCUIT 4-EG7 (GY/RD) FOR OPEN

1

Disconnect DLC C251.

2

Measure the resistance between the parking brake module C7051a pin 1, circuit 4-EG7 (GY/RD), harness side and the DLC C251 pin 2, circuit 4-EG7A (BU/RD), harness side.

Is the resistance less than 5 ohms?

Yes

GO to A7.

No

REPAIR the circuit(s) as necessary. TEST the system for normal operation.

A7: CHECK CIRCUIT 5-EG7 (BU/RD) FOR OPEN

1

Measure the resistance between the parking brake module C7051a pin 7, circuit 5-EG7 (BU/RD), harness side and the DLC C251 pin 10, circuit 5-EG7A (BU/RD), harness side.

Is the resistance less than 5 ohms?

Yes

INSTALL a new parking brake module.
REFER to Parking Brake Module - in this section.
TEST the system for normal operation.

No

REPAIR the circuit(s) as necessary. TEST the system for normal operation.