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Control System Diagnostic Sheet Reference: Body

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PCM BODY HARNESS CONNECTOR PIN DESCRIPTION AND EXPECTED VALUES

Pin # Name Key On Low Idle High Idle Operating Range Comments
1 CTO 12.2 12.2 12.4 1 - VPWR Tachometer Output (Aftermarket)
2 ACCR B+ 0/B+ 0/B+ 0/B+ A/C Clutch Relay Control
B+ = A/C OFF
0 = A/C ON
3 DOL 0 0 0 0 - 5 Tripminder Fuel Economy
Digital Signal
4 TRO PN 0 0 0 0/B+ Starter Relay Enable
0 = Enabled
5 FPC 0/B+ 0 0 0 Fuel Pump Relay Control
B+ = Pump OFF
0 = Pump ON
6 N/A N/A N/A N/A N/A N/A
7 TPO 0 0 0 0 Throttle Position Output
8 ACCS 0 0/B+ 0/B+ 0/B+ A/C Cycling Pressure Switch
B+ = A/C ON
0 = A/C OFF
9 SCIL B+ B+ B+ 0/B+ Speed Control Indicator
B+ = Indicator OFF
0 = Indicator ON
10 CASEGND 0 0 0 0 Chassis Ground
11 PWR GND 0 0 0 0 Power Ground
12 PTO 0 0/B+ 0/B+ 0/B+ Power Take Off (Aftermarket)
0 = PTO Disengaged
B+ = PTO Engaged
13 CAN1H 2.7 2.7 2.7 -3 - 16 CAN+ Module Communications
14 CAN1L 2.4 2.4 2.4 -3 - 16 CAN- Module Communications
15 WFS 4.6 4.6 4.6 4.4 Water In Fuel Sensor
Diesel > 4.4
Water < 3.3
16 ACPSW 0 0/B+ 0/B+ 0/B+ A/C Pressure Switch
12 = A/C Pressure < 325 psig
0 = A/C Pressure > 325 psig
17 PBA 0/B+ 0/B+ 0/B+ 0/B+ Park Brake Applied
0 = Brake Applied
12 = Brake OFF
18 BPP 0/B+ 0/B+ 0/B+ 0/B+ Brake Pedal Position
12 = Brake Applied
0 = Brake OFF
19 FPM 0/B+ B+ B+ B+ Fuel Pump Monitor
B+ = Fuel Pump ON
20 SIGRTN2 0 0 0 0 Accelerator Pedal Position Sensor Signal Return
21 MAFRTN 0 0 0 0 Mass Air Flow Sensor Signal Return
22 VSO 0 0 0 0 - VBAT Vehicle Speed Out
23 PWRGND 0 0 0 0 Power Ground
24 SCCSRTN 0 0 0 0 Speed Control Switch Signal Return
25 APP3 1.0 1.0 1.45 0.8 - 3.5 Accelerator Pedal Track 3
CT = 0.8 - 1.1
WOT = 3.1 - 3.5
26 APP1 4.1 4.1 3.5 0.7 - 4.2 Accelerator Pedal Track 1
CT = 3.9 - 4.2
WOT = 0.7 - 1.2
27 N/A N/A N/A N/A N/A N/A
28 BPS 0/B+ 0/B+ 0/B+ 0/B+ Brake Pressure Switch
0 = Brake Applied
B+ = Brake OFF
29 VREF2 5 5 5 5 +/- 0.5 Reference Voltage
30 GENIL 0 0 0 0/B+ Generator Indicator
31 SCCS 6.7 6.7 6.7 0 - 7.0 Speed Control Command Switches
ON = B+
OFF = 0
SET = 2.8
RESUME = 4.7
COAST = 0.8
HOLD = 6.6
32 BUS+ 0.3 0.3 0.3 0 - 5 SCP+ Module Communications
33 SIGRTN 0 0 0 0 Signal Return
34 VPWR B+ B+ B+ B+ Vehicle Power
35 VSS 8.89V 9.82V 9.85V 5.5 - 333 Hz Vehicle Speed Signal
36 CPP/TOW 0V/B+ 0V/B+ 0V/B+ 0V/B+ Grade Load Switch (Automatic Trans)
0 = Switch OFF
B+ = Switch ON
Clutch Pedal Position Switch (Manual Trans)
0 = Pedal PRESSED
B+ = Pedal OFF
37 APP2 1.53 1.53 2.00 1.4 - 4.1 Accelerator Pedal Track 2
CT = 1.4 - 1.6
WOT = 3.6 - 4.1
38 BARO 4.6 4.6 4.6 2.4 - 4.8 (early build)
0.5 - 4.5 (late build)		 Barometric Pressure
39 FEPS 0 0 0 N/A Flash EPROM Digital Signal
40 KAPWR B+ B+ B+ B+ Keep Alive Power
41 MAP 1.35 1.41 1.61 0.5 - 4.5 Manifold Absolute Pressure
1.35 = 103 kPa (14.9 psi)
4.5 = 300 kPa (43.5 psi)
42 MAF 0 1.36 2.65 0 - 4.7 Mass Air Flow Signal
43 IAT1 2.3 3.1 2.5 0.13 - 4.9 Intake Air Temperature (Mass Air Flow Assembly)
4.9 = -40°C (-40°F)
0.5 = 100°C (212°F)
44 BUS- 4.8 4.8 4.8 0 - 5 SCP- Module Communications
45 VREF 5 5 5 5 +/- 0.5 Reference Voltage
46 VPWR B+ B+ B+ B+ Vehicle Power
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