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Dave Nova
Dave Nova, Chevrolet Technician
Category: Chevy
Satisfied Customers: 19450
Experience:  ASE Master Certification. GM World Class Certification
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Hello, I have a 2000 GMC C6500 with a 7.4 ltr engine with very

This answer was rated:

Hello, I have a 2000 GMC C6500 with a 7.4 ltr engine with very little power. My scanner picked up a bad oxygen senser (B2 S1). Upon visual inspection I noticed a burned wire on it. I replaced the sensor and I have the same symptom, the sensor does not fluctuate like the other one. It is frozen at 447mv. Do I need to reset something? Can it be a wire between the O2S and the PCM? Please help. Thank you. Martin

It is probably an open wire between the O2 sensor and the PCM. Check the tan and purple wires coming off the sensor to the PCM. Here is the schematic.

 

Object Number: 577270  Size: FS

 

 

 

Powertrain Control Module (PCM) Connector C2 (Blue)


Object Number: 23346  Size: CF
Click here for detailed picture of above image.

Connector Part Information

PCM Connector C2 (Blue)
80 Pin Connector

Pin

Wire Color

Circuit No.

Function

1-3

--

--

Not Used

4

RED

631

Camshaft Position (CMP) Sensor Battery Positive Voltage

5

TAN

1667

HO2S Signal Low Bank 2 Sensor 1

6

TAN/WHT

1653

HO2S Signal Low Bank 1 Sensor 1

7

--

--

Not Used

8

TAN

472

Intake Air Temperature (IAT) Sensor Signal

9

BRN

1456

EGR Valve Pintle Position Signal

10-18

--

--

Not Used

19

PNK

439

PCM Ignition Positive Voltage

20

ORN

1040

PCM Battery Positive Voltage

21

BLK/WHT

451

PCM Ground

22

YEL/BLK

1868

Crankshaft Position (CKP) Sensor Ground

23

--

--

Not Used

24

BLK

476

Sensor Ground Jumper

25

BLK/WHT

1704

Engine Coolant Temperature (ECT) Sensor Ground

26

BLK

407

MAP Sensor Ground

27

WHT/BLK

499

REDUCED ENGINE POWER Lamp Control

28

LT/BLU

1377

CHECK GAUGES Lamp Control

29-31

--

--

Not Used

32

GRY

324

Automatic Transmission Modulator Relay Control

33

--

--

Not Used

34

GRY

435

EGR Valve Ground

35

WHT

121

Tachometer Control

36

--

--

Not Used

37

DK GRN/WHT

465

Fuel Pump Relay Control

38

RED

1676

EGR Valve Control

39-44

--

--

Not Used

45

GRY

705

Engine Oil Pressure (EOP) Gauge Sensor 5 volt Reference

46

PPL

1666

HO2S Signal High Bank 2 Sensor 1

Dave Nova and other Chevy Specialists are ready to help you
Customer: replied 8 years ago.
Dave, with this sensor not working will the truck be sluggish? When I try to accelerate it just "boggs."

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