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Diagnostic Circuit Check: Troubleshooting

TROUBLESHOOTING CHART

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?		 - Go to 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 toABS 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 toElectronic 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 1, 14 and 20 of ABS wiring harness connector.

Is the voltage within the specified value on each terminal?		 11 - 14 V 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 13 and 26 to ground.

Is the resistance equal to the specified value?		 0 Ω 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 18 of the ABS wiring harness connector and terminal 12 of the Data Link Connector (DLC). Is the resistance below the specified value? 2 Ω 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 18 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 chart for the DTC -
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