No Communication with Electronic Brake and Traction Control Module. Pontiac Grand Prix 1998

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1998 🢒 Grand Prix 🢒 Brakes 🢒 Antilock Brake System 🢒 No Communication with Electronic Brake and Traction Control Module

ABS Components
ABS/TCS Schematics

Circuit Description

The UART serial data link allows information to be exchanged from module to module as needed. This is done by the PCM, the PCM requests and sends all the information that is transmitted on the UART line. When a scan tool is connected to the UART line it takes over for the PCM and sends and requests the needed information.

Diagnostic Aids

•	Thoroughly inspect the wiring and the connectors. Failure to carefully and fully inspect the wiring and the connectors can result in misdiagnosis. Misdiagnosis may cause replacement of parts without repairing the malfunction.

•	If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems for further diagnosis.

No Communication with EBTCM

Step	Action	Value(s)	Yes	No
DEFINITION: Scan tool can not communicate with the EBTCM.
1	Was the Diagnostic System Check performed?	--	Go to Step 2	Go to Diagnostic System Check
2	Turn the Ignition switch to the RUN position with the engine off. Can the scan tool communicate with other modules on the UART serial data line, such as the PCM?	--	Go to Step 3	Go to Diagnostic System Check - Data Link Communications in Wiring Systems
3	Inspect the 10A A/C CLU / ABS IGN fuse in the Underhood Accessory Wiring Junction Block. Is the fuse OK?	--	Go to Step 4	Go to Step 6
4	Install the fuses if removed. Turn the ignition switch to the RUN position, engine off. Using J 39200 DMM, measure the voltage at the 10A A/C / CLU / ABS IGN fuse by probing between the fuse test terminals and a good ground. Is the voltage within the range specified within the value(s) column?	Battery Volts	Go to Step 5	Go to Power Distribution Schematics in Wiring Systems
5	Turn the ignition switch to the OFF position. Disconnect the EBTCM connector C1. Connect the J 39700 Universal Pinout Box using the J 39700-530 cable adapter to the EBTCM harness connector C1 only. Using J 39200 DMM, measure the resistance between J 39700 terminal 15 and a good ground. Is the resistance within the range specified in the value(s) column?	0 - 5ohms	Go to Step 10	Go to Step 9
6	Install a new 10A A/C / CLU / ABS IGN fuse. Turn the ignition switch from the OFF to RUN position, engine off. Recheck the fuse. Is the fuse OK?	--	Go to Diagnostic System Check	Go to Step 7
7	Turn the ignition switch to the OFF position. Remove the 10A A/C / CLU / ABS IGN fuse. Disconnect the EBTCM connector C1. Connect the J 39700 Universal Pinout Box using the J 39700-530 cable adapter to the EBTCM harness connector C1 only. Using J 39200 DMM, measure the resistance between terminals 8 and 15 of J 39700 . Is the resistance within the range specified in the value(s) column?	OL (infinite)	Go to Step 12	Go to Step 8
8	Repair CKT 1239 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete?	--	Go to Diagnostic System Check	--
9	Repair CKT 251 or G205 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Is the repair complete?	--	Go to Diagnostic System Check	--
10	Turn the ignition switch to the RUN position, engine off. Using J 39200 DMM, measure the voltage between J 39700 terminals 8 and 15. Is the voltage within the range specified in the value(s) column?	Battery Volts	Go to Step 13	Go to Step 11
11	Repair CKT 1239 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Is the repair complete?	--	Go to Diagnostic System Check	--
12	Replace the EBTCM. Refer to Electronic Brake and Traction Control Module Replacement . Is the replacement complete?	--	Go to Diagnostic System Check	--
13	Turn the ignition switch to the OFF position. Using J 39200 DMM, measure the resistance between the J 39700 terminal 24 and the DLC terminal 9. Is the resistance within the range specified in the values column?	0-5ohms	Go to Step 12	Go to Step 14
14	Repair CKT 800 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Is the repair complete?	--	Go to Diagnostic System Check	--