Communication System Diagnostics

Before proceeding to communication DTC tables to diagnose a communication DTC:

Review vehicle equipment level.
Make note of modules and systems vehicle is equipped with.

Before performing any testing:

Ensure DTC being diagnosed is referencing a module or system vehicle is equipped with.
New Generation Star (NGS) scan tester may produce a communication DTC for no communication if vehicle is not equipped with suspect module or system.
New Generation Star (NGS) scan tester will interpret a not equipped module as a communication failure.
If a DTC is retrieved for a module or system vehicle is not equipped with, disregard this DTC.
If the only communication DTC retrieved is for a module or system vehicle is not equipped with, self-test is considered passed.

J1850 COMMUNICATION NETWORK DTC DEFINITIONS

DTC

Source Module(s)

Test

0000

---

Network Passed

0001

PCM

0002

EATC

0003

PCM/EATC

0004

NGV

0005

NGV/PCM

⁽¹⁾

0006

EATC/NGV

⁽²⁾

0007

EATC/NGV/PCM

⁽³⁾

⁽¹⁾	Perform TEST E. If vehicle is not equipped with NGV module, perform TEST A.

⁽²⁾	If equipped with EATC module, perform TEST B. If equipped with NGV module, perform TEST D. If vehicle is not equipped with either system, system passed and no further action is required.

⁽³⁾	If vehicle is not equipped with NGV module, perform TEST C. If vehicle is not equipped with EATC module, perform TEST E. If vehicle is not equipped with EATC or NGV, perform TEST A.

ISO 9141 COMMUNICATION LINK DTC DEFINITIONS

DTC

Source Module(s)

Test

0000

---

Link Passed

0001

LCM

0002

ABS

⁽¹⁾

0003

ABS/LCM

⁽²⁾

0004

DSM

System Passed

0005

DSM/LCM

0006

ABS/DSM

⁽¹⁾

0007

ABS/DSM/LCM

⁽²⁾

0008

DDM

⁽³⁾

0009

DDM/LCM

⁽⁴⁾

000A

ABS/DDM

⁽⁵⁾

000B

ABS/DDM/LCM

⁽⁶⁾

000C

DDM/DSM

⁽³⁾

000D

DDM/DSM/LCM

⁽⁴⁾

000E

ABS/DDM/DSM

⁽⁵⁾

000F

ABS/DDM/DSM/LCM

⁽⁶⁾

0010

AIR BAG

0011

AIR BAG/LCM

0012

ABS/AIR BAG

⁽⁷⁾

0013

ABS/AIR BAG/LCM

⁽⁷⁾

0014

DSM/AIR BAG

0015

DSM/AIR BAG/LCM

0016

ABS/DSM/AIR BAG

⁽⁷⁾

0017

ABS/DSM/AIR BAG/LCM

⁽²⁾

0018

DDM/AIR BAG

⁽⁸⁾

0019

DDM/AIR BAG/LCM

⁽⁴⁾

001A

ABS/DDM/AIR BAG

⁽⁹⁾

001B

ABS/DDM/AIR BAG/LCM

⁽⁶⁾

001C

DDM/DSM/AIR BAG

⁽⁸⁾

001D

DDM/DSM/AIR BAG/LCM

⁽⁴⁾

001E

ABS/DDM/DSM/AIR BAG

⁽⁹⁾

001F

ABS/DDM/DSM/AIR BAG/LCM

⁽¹⁰⁾

⁽¹⁾	Perform TEST G. If vehicle is not equipped with ABS, system passed and no further action is required.

⁽²⁾	Perform TEST G. If vehicle is not equipped with ABS, perform TEST F.

⁽³⁾	Perform TEST H. If vehicle is not equipped with DDM, system passed and no further action is required.

⁽⁴⁾	Perform TEST H. If vehicle is not equipped with DDM, perform TEST F.

⁽⁵⁾	Perform TEST G. If vehicle is not equipped with ABS, perform TEST H. If vehicle is not equipped with DDM or ABS, system passed and no further action is required.

⁽⁶⁾	Perform TEST G. If vehicle is not equipped with ABS, perform TEST H. If vehicle is not equipped with ABS or DDM, perform TEST F.

⁽⁷⁾	Perform TEST G. If vehicle is not not equipped with ABS, perform TEST J.

⁽⁸⁾	Perform TEST H. If vehicle is not equipped with DDM, perform TEST J.

⁽⁹⁾	Perform TEST G. If vehicle is not equipped with ABS, perform TEST H. If vehicle is not equipped with ABS or DDM, perform TEST J.

⁽¹⁰⁾	Perform TEST K. If vehicle is not equipped with ABS, perform TEST L. If vehicle is not equipped with DDM, perform TEST M. If vehicle is equipped with AIR BAG and LCM, perform TEST N.