DTC C0271-C0273, C0284 EBCM Malfunction. Isuzu S/T Isuzu

For 1990-2009 cars only

Makes 🢒 Isuzu 🢒 2000 🢒 S/T Isuzu - 4WD 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C0271-C0273, C0284 EBCM Malfunction

Circuit Description

The EBCM initializes a self-test when the ignition is turned to the RUN position. This internal self-test verifies that all ABS circuitry is operating correctly.

Conditions for Running the DTC

•	Ignition switch in the RUN position.

•	The ABS bulb check is completed

Conditions for Setting the DTC

Any condition within the EBCM which causes a memory error will set this DTC.

Action Taken When the DTC Sets

•	The ABS indicator lamp is turned on

•	The ABS is disabled

Malfunction responses to DTC C0271--C0273 and C0284 vary, depending on the affected subsystem.

•	ABS--C0271, C0272 Permanent latched, C0273, C0284--Ignition latched

•	DRP--DRP critical

For a detailed explanation of DTC malfunction responses, refer to Self-Diagnostics

Conditions for Clearing the DTC

•	Repair the conditions responsible for setting the DTC

•	Use the Clear DTCs function on the Scan Tool

DTCs C0271 through C0273, and C0284 are EBCM internal diagnosis trouble codes. Replace the EBCM if these tests show that the EBCM circuitry has failed. Refer to Electronic Brake Control Module Replacement .

Test Description

The numbers below refer to the steps in the diagnostic table:

This step checks if the EBCM will Clear DTCs.

This step checks if the DTC was set previously.

Step	Action	Value(s)	Yes	No
1	Did you perform the ABS Diagnostic System Check?	--	Go to Step 2	Go to Diagnostic System Check
2	Install a scan tool. Use the scan tool in order to clear the DTCs. Road test the vehicle. Use the scan tool to monitor for DTCs. Did vehicle operation cause this DTC to set?	--	Go to Step 4	Go to Step 3
3	Malfunction is intermittent. Inspect all connectors and harnesses for damage which may result in high resistance when all components are connected. Refer to diagnostic aids for more information. Did you find and repair the condition?	--	Go to Step 5	Go to Step 4
4	Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement?	--	Go to Step 5	--
5	Operate the vehicle under the conditions for running the DTC as specified in the supporting text. Does the DTC set?	--	Go to Step 2	System OK