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John
John, GMC Technician
Category: GM
Satisfied Customers: 9176
Experience:  ASE MASTER TECHNICIAN/40 years experience
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96 gmc: 60 psi fuel pressure, no power on acceleration..pcm..sensors

Customer Question

96 gmc jimmy 4.3 liter. intermitten no start, 60 psi fuel pressure, no power on acceleration, new convertor, no communication with PCm, all sensors disconnected , power and ground @ ALDL, back fires @ 50% THROTTLE
Submitted: 8 years ago.
Category: GM
Expert:  John replied 8 years ago.

HelloCustomer

The communications problem must be repaired first so the computer can operate your vehicle.Check the circuits at the data link connector.

#2 should be serial dat line,test with ohm meter to PCM

#4 & 5 should be grounds

#16 should have 12 volts power.

If these check out good ,replace the PCM.

Data Link Communications Connector End Views

Data Link Connector


Object Number: 68793  Size: CH

Connector Part Information

12110250
16-Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

PPL

1132

Serial Data Signal - Class B - 10400 Baud - Diagnostic to ALDL

3

--

--

Not Used

4

BLK

1850

Ground

5

BLK/WHT

451

Ground

6-8

--

--

Not Used

9

TAN

800

Serial Data Signal-UART-8192-Baud-Primary

10-12

--

--

Not Used

13

ORN

1568

Diagnostic Signal-Transfer Case Control Module

14-15

--

--

Not Used

16

ORN

640

Fuse Output-Battery