C05TimothyBrown

Anyone who understands the EBCM and specifically the steering wheel position sensor, I have been having difficulty trouble-shooting my active handling problem.

History: "Service Vehicle Soon, Service Active Handling" used to come up intermitently (quicker when it was cold for some reason). Well, I finally decided to try and fix the problem. I originally had 1287H (Steering Sensor Rate Malfunction),1288H (?). I figured it was a steering wheel sensor problem. I had that fixed and the problem was still there. After clearing the codes C1281 remained. The mechanic said he traced all related wires and connect ions from steering wheel position sensor to EBCM and found EBCM to be open internally. Basically the signal was getting to the EBCM but was getting screwed there. So, I took out the EBCM and sent it to David Ruberg "digitalguy". It came back in a week and I prompty installed it. . The following codes showed after installation TCS-C1287H
TCS-C1288H TCS-U1000H SDM-U1000H SDM-U1040H SDM-U1096H SDM-U1064H and LDCM-B2264H. When I drove it it became apparent that as soon as I made any steering input the brakes started acting funny. I had to turn the active handling off to drive home safely. I cleared the codes once more to see what keep poping up and now I only have TCS-C1286H (Steering Sensor Bias Malfunction). I think I need to buy a new EBCM, whatever David fixed wasn't my particular problem. The steering wheel definitely trips the problems.

Any help is greatly appreciated,
Tim (2001 Z06)

87SAM

Is your steering wheel still centered when moving forward in a straight line? It could be an alignment issue?

C05TimothyBrown

I've already considered this. My steering wheel is set straight. But from what I've learned the steering wheel position system doesn't care where "straight" is anyway. It uses an algorithm to determine what "straight" is everytime you turn your car on to take into account steering wheel mis-alignment. Any other ideas?

87SAM

Yes, you kind of got me there, was thinking more of alignment.

From the manual:
It is very important to check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a flat surface.

It is very important to find out from the driver when the code was set, (when the SERVICE ACTIVE HNDLG message was activated). This information may help to duplicate the failure.

It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. Check connector C102 RH side rear of engine compartment for water intrusion or missing plugs, and that the connector is oriented horizontal to prevent water intrusion.

An intermittent malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

C05TimothyBrown

The vehicle alignment is pretty darn good. As far as the driver, I think it was me. It started very intermittent when I first go the car and has gradually gotten more common. Can u give me more details on where connector C102 is? That's the kind of help I was looking for because I think it might be a bad connection somewhere that's gotten worse.

byronhunter

C102 Location, from '02 Service manual:
-----------------------------------------------------
Instrument panel harness to forward lamp harness, RH side rear of engine compartment
-----------------------------------------------------
C102






Connector Part Information
115326863
16-Way F 150 GT Series (BLK)
Connector Part Information
115326868
16-Way M 150 GT Series (BLK)

Pin
Wire Color
Circuit No.
Function
Pin
Wire Color
Circuit No.
Function

A
LT BLU
1764
Steering Wheel Position Signal-Phase B
A
LT BLU
1764
Steering Wheel Position Signal-Phase B

B
DK GRN

/WHT
817
Vehicle Speed Signal
B
DK GRN

/WHT
817
Vehicle Speed Signal

C
DK GRN
1049
Serial Data
C
DK GRN
1049
Serial Data

D
DK GRN

/WHT
762
A/C Request Signal
D
DK GRN

/WHT
762
A/C Request Signal

E
GRY
48
Cruise Control Release Switch Signal
E
GRY
48
Cruise Control Release Switch Signal

F
LT GRN

/BLK
735
Outside Ambient Temperature Sensor Signal
F
LT GRN

/BLK
735
Outside Ambient Temperature Sensor Signal

G
GRY/BLK
1798
Ground
G
GRY/BLK
1798
Ground

H
LT GRN
1763
Steering Wheel Position Signal-Phase A
H
LT GRN
1763
Steering Wheel Position Signal-Phase A

J
BLK
470
Sensor Ground
J
BLK
470
Sensor Ground

K
GRY
1056
Steering Wheel Position Sensor Feed
K
GRY
1056
Steering Wheel Position Sensor Feed

L
ORN/BLK
556
Steering Wheel Position Sensor Return
L
ORN/BLK
556
Steering Wheel Position Sensor Return

M
LT BLU
1122
Serial Data
M
LT BLU
1122
Serial Data

N
DK BLU
716
Yaw Rate Sensor Input
N
DK BLU
716
Yaw Rate Sensor Input

P
LT GRN

/BLK
1338
Lateral Accelerometer Signal
P
LT GRN

/BLK
1338
Lateral Accelerometer Signal

R
GRY
847
Extended Brake Travel Signal
R
GRY
847
Extended Brake Travel Signal

S
DK GRN

/WHT
357
Oil Temperature Sensor Signal
S
DK GRN

/WHT
357
Oil Temperature Sensor Signal

C05TimothyBrown

I'm sorry guys but could I get a more practical point out? I am thinking it's back by the battery but don't see a matching number from what's been written.
thanks,
Tim

byronhunter

This Work?

-------------------------------------------------

(1) Fuse Block - Underhood C3
(2) A/C Compressor Clutch
(3) S106
(4) S107
(5) Electronic Brake Control Module (EBCM)
(6) Cooling Fan - Left
(7) C107
(8) Brake Fluid Pressure Sensor
(9) Brake Differential Switch
(10) Brake Fluid Level Switch
(11) Windshield Washer Fluid Pump
(12) Repeater Lamp - Left
(13) Windshield Washer Fluid Level Switch
(14) G103
(15) SP101
(16) G101
(17) Headlamp Door Assembly - Left
(18) Fog Lamp - LF
(19) Secondary Air Injection (AIR) Pump
(20) S108
(21) Cooling Fan - Right
(22) Ambient Air Temperature Sensor
(23) Fog Lamp - RF
(24) Horn Assembly
(25) C100
(26) C113
(27) Headlamp Door Control Module C2
(28) Headlamp Door Control Module C1
(29) Headlamp Door Assembly - Right
(30) G102
(31) SP100
(32) Secondary Air Injection (AIR) Solenoid
(33) A/C Refrigerant Pressure Sensor
(34) Repeater Lamp - Right
(35) G108
(36) C102
(37) UHEC C6
(38) C148
(39) C140
(40) C150

C05TimothyBrown

Awesome, thanks a lot for all the help guys.
Tim