Gotcha. BPP Switch.

 

I have it listed at the BOO. Brake on/off

1999 Ford PCM Pinouts


Pin # Name Description
1
2 SES Light
3 MIAHM Manifold Intake Air Heater Monitor
4
5 PBA Parking Brake Applied Switch;
6 SS1 Shift Solenoid #1
7
8 GPMH Glow Plug Monitor High Side
9 GPMR Glow Plug Monitor Right Bank
10 IVS Signal Idle Validation Switch
11 SS2 Shift Solenoid #2
12 TCIL Trans Control Indicator Light
13 FEPS Flash EPROM Power Supply
14 4x4 Low 4x4 low switch
15 BUS - OBD Connector
16 BUS + OBD Connector
17 TR1 Signal Transmission Gear Selected
18
19 TAC Tach Signal Reflected CMP signal
20 CSS Coast Clutch Solenoid
21 CAMP Signal Cam Shaft Position
22
23
24 AP Ground Accelerator Pedal Sensor Ground
25 CASE Gnd CASE Ground
26
27
28 WIFIL Water In Fuel Indicator Lamp
29 TCS Transmission Control Switch
30 EBP Exhaust Back Pressure Sensor
31 BPA Brake Pedal Applied Switch
32
33
34 GPML Glow Plug Monitor Left Bank
35 Altenator 1 Monitor
36 WIF Water in Fuel
37 TFT Transmission Fluid Tempature
38 EOT Signal Engine Oil Tempature
39 IAT Signal Intake Air Temp
40 FPM Fuel Pump Monitor
41 ACC Air Conditioning Clutch
42 EPR Exhaust Back Pressure Regulator
43 DOL Tripometer
44
45
46
47 WGC Waste Gate Control
48 EF To the IDM
49 TR2 Signal Transmission Gear Selected
50 TR4 Signal Transmission gear Selected
51 PG Power Ground
52
53
54 TCC Torque Converter Clutch Solenoid
55 KAPWR Keep Alive Power
56
57
58 VSS + Vehicle Speed Sensor
59 OSS Output Shaft Speed Sensor
60 Altenator 2 Control
61 SCCS Cruise Control Command Switch
62 MAT Signal Manifold Air Temperature
63
64 TR3A Signal Transmission
65 Camp Ground Cam Shaft Position
66 PTO Enabled Power Takeoff
67 Battery Light Dual Alternator Battery Lamp Indicator
68
69
70 GPL Glow Plug Lamp
71 VPWR Ignition source power
72
73
74
75
76 PG Power Ground
77 PG Power Ground
78
79 MAP Manifold Absolute Pressure
80 IDM IDM Relay
81 EPC Electronic Pressure Control Solenoid
82
83 IPR Injection Pressure Regulator
84 TSS Transmission Speed Sensor
85
86
87 ICP Signal Injection Control Pressure Sensor
88
89 AP Signal Accelerator Pedal Sensor
90 VREF
91 Signal Return
92 BOO Brake On/Off Switch
93
94 FP Fuel Pump Control
95 FDCS Fuel Delivery Control Signal
96 CI Cylinder Identification
97 VPWR
98 MIAH Manifold Intake Air Heater
99
100 FLI Fuel Level Indicator
101 GPC Glow Plug Control
102
103 PG Power Ground

 

We're talking about the same thing, same pin. BPP is Brake Pedal Position switch which signals Brake On or Off.

 

Drove my truck to work Friday. Worked good all day then quit locking TC on the way home. I kicked the PCM with my foot a couple of times and it started working again. I believe I have something loose on the PCM itself.

 

Love that troubleshooting technique! I've been know to revert to that technique a time or two in the past with electronic devices. Usually shortly before I discard the electronic device.

I believe your conclusion has merit. A faulty electrical connection somewhere there. Either a broken soldered joint on the circuit board - or perhaps a poor pin connection.

 

There comes a point when you have tried everything else and frustration kicks in. This time it worked. Most times it doesn't.

 

Final update: After checking all wiring and sensors, I finally ordered a new PCM. What a difference. Starts quicker, runs smoother and the TC kicks in as it should as well as the cruise control.

It took so long to buy another PCM because the the one I had was less than a year old, but I guess it was defective.