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Diagnostic Process

Perform the following steps in order when servicing the ABS/EBD system. Failure to do so may result in the loss of important diagnostic data and may lead to difficulties and time-consuming diagnosis procedures.

  1. Perform the tests of the table below.
  2. Perform a road test if directed by the table.
    • Test drive the vehicle while using the snapshot feature of the scan tool.
    • Perform normal acceleration, stopping, and turning maneuvers.
    • If this does not reproduce the malfunction, perform an ABS stop on a low friction surface such as gravel.
  3. Clear the diagnostic trouble codes (DTCs) after all system malfunctions have been corrected.
DIAGNOSTIC INFORMATION AND PROCEDURES

Step Action Value(s) Yes No
1
  1. Install the scan tool.
  2. Turn ignition switch to ON.
  3. Select the Data List mode.

Is the scan tool receiving data from the electronic brake control module (EBCM)?		 - Go to Step 2 Go to Step 6
2 Check the display.
Are there any current DTCs displayed?		 - Refer to the applicable DTC table Go to Step 3
3
  1. Turn the ignition switch to LOCK for 10 seconds.
  2. Turn the ignition switch to ON and observe the ABS indicator.

Does the indicator light for 4 seconds and then go off?		 - Go to Step 5 Go to Step 4
4 Check the ABS indicator.
Did the ABS indicator turn on and stay on?		 - Go to "ABS INDICATOR LAMP ILLUMINATED CONTINUOUSLY, NO DTCS STORED :" Go to "ABS INDICATOR LAMP INOPERATIVE :"
5
  1. Turn the ignition switch to LOCK for 10 seconds.
  2. Turn the ignition switch to ON and observe the parking brake / EBD indicator.

Does the indicator light for 4 seconds and then go off?		 - Go to Step 12 Go to "ELECTRONIC BRAKE-FORCE DISTRIBUTION (EBD) SYSTEM INDICATOR LAMP INOPERATIVE :"
6
  1. Turn the ignition switch to LOCK.
  2. Disconnect the ABS wiring harness connector.
  3. Turn the ignition switch to ON.
  4. Use a digital voltmeter (DVM) to measure the voltage from ground to terminal 15, 17, and 18 of ABS wiring harness connector.

Is the voltage within the specified value on each terminal?		 11-14V Go to Step 7 Go to "POWER SUPPLY TO CONTROL MODULE, NO DTCS STORED :"
7
  1. Turn the ignition switch to LOCK.
  2. Use a DVM to measure the resistance from the ABS wiring harness connector, terminals 16 and 19 to ground.

Is the resistance equal to the specified value?		 0Ω Go to Step 9 Go to Step 8
8 Repair the open in the circuit BLK and BLK/WHT that failed.
Is the repair complete?		 - System OK -
9 Use a DVM to measure the resistance between terminal 11 of the ABS wiring harness connector and terminal 12 of the Data Link Connector (DLC). Is the resistance below the specified value? 2Ω Go to Step 10 Go to Step 11
10 Replace the EBCM unit assembly.
Is the repair complete?		 - System OK -
11 Repair the open or high resistance in circuit DK BLU between terminal 11 of the ABS wiring harness connector and terminal 12 of the DLC jack.
Is the repair complete?		 - Go to Step 1 -
12 Perform the road test described above.
Are any DTCs set?		 - Go to the table for the DTC -
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