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DTC Troubleshooting

DTC C1200 LEFT FRONT WHEEL SPEED SENSOR CIRCUIT OPEN OR SHORTED DIAGNOSTIC PROCEDURE

Step Action Value(s) Yes No
1 Was the diagnostic circuit check performed? - Go to Step 3. Go to Step 2.
2 Perform the Diagnostic Circuit Check.
Did you find problem?		 - Go to Step 3. System OK
3
  1. Ignition switch "OFF".
  2. Inspect the left front wheel speed sensor and jumper harness for other physical damage.

Is any physical damage noted?		 - Go to Step 4. Go to Step 5.
4 Repair the damage to the left front wheel speed sensor, jumper harness.
Is the repair completed?		 - System OK -
5 Test-drive vehicle at various speeds and over various road surfaces.
Did C1200 reset?		 - Go to Step 7. Go to Step 6.
6 DTC C1200 is intermittent. Refer to Diagnostic Aids. - System OK -
7
  1. Ignition switch "OFF", vehicle in park.
  2. Raise and suitably support the vehicle.
  3. Disconnect the left front jumper harness from the left front wheel speed sensor.
  4. Connect an ohmmeter to terminals 2 and 1 of the left front wheel speed sensor.

Is the resistance with in specified range?.		 800-1600 (Resistance will vary with temperature) Go to Step 9. Go to Step 8.
8 Replace the left front wheel speed sensor. - System OK -
9
  1. Left front jumper harness still disconnected from the speed sensor.
  2. Connect an ohmmeter to terminal 2 of the left front wheel speed sensor and then to body ground.

Is the resistance within the specified range?		 OL (open circuit) Go to Step 10. Go to Step 8.
10
  1. Disconnect the EBCM harness from the EBCM.
  2. Disconnect the left front jumper harness from the wheel speed sensor.
  3. Connect an ohmmeter to EBCM harness terminal 20 and then the wheel speed sensor terminal 2.

Is the resistance within the specified range?		 Less than 2 Go to Step 12. Go to Step 11.
11 Repair the open or high resistance between terminals 20 and 2. - System OK -
12
  1. EBCM harness still disconnected from the EBCM.
  2. Left front jumper harness still disconnected from the wheel speed sensor.
  3. Connect an ohmmeter to EBCM harness terminal 19 and then to wheel speed sensor terminal 1.

Is the resistance within the specified range?		 Less than 2 . Go to Step 4. Go to Step 13.
13 Repair the open or high resistance between terminals 19 and 1. - System OK -
14
  1. EBCM harness still disconnected from the EBCM.
  2. Left front jumper harness still disconnected from the wheel speed sensor.
  3. Connect a voltmeter to EBCM harness terminal 20 and then to body ground.

Is the voltage within the specified range?		 Less than 1 V Go to Step 16. Go to Step 15.
15 Repair the source open or high resistance between terminals 20 and 2. - System OK -
16
  1. EBCM harness still disconnected from the EBCM.
  2. Left front jumper harness still disconnected from the wheel speed sensor.
  3. Connect a voltmeter to EBCM harness terminal 19 and then to body ground.

Is the voltage within the specified range?		 Less than 1 V Go to Step 18. Go to Step 17.
17 Repair the short to voltage between terminals 19 and 1. - System OK -
18
  1. EBCM harness still disconnected from the EBCM.
  2. Left front jumper harness still disconnected from the wheel speed sensor.
  3. Connect an ohmmeter to EBCM harness terminal 20 and then to body ground.

Is the resistance within the specified range?		 OL (open circuit) Go to Step 20. Go to Step 19.
19 Repair the short to ground between terminals 20 and 2. - System OK -
20
  1. EBCM harness still disconnected from the EBCM.
  2. Left front jumper harness still disconnected from the wheel speed sensor.
  3. Connect an ohmmeter to EBCM harness terminal 19 and then to body ground.
  4. Left front jumper harness still disconnected from the wheel speed sensor. Connect an ohmmeter to EBCM harness terminal 19 and then to body ground.

Is the resistance within the specified range?		 OL (open circuit) Go to Step 22. Go to Step 21.
21 Repair the short to ground between terminals 19 and 1. - System OK -
22
  1. EBCM harness still disconnected from the EBCM.
  2. Connect an ohmmeter to EBCM harness terminal 19 and 20.

Is the resistance within the specified range?		 OL (open circuit) Go to Step 24. Go to Step 23.
23 Repair the short between the 2 circuits. - System OK -
24
  1. Replace the left front wheel speed sensor Jumper Harness.
  2. Test-drive the vehicle at various speeds and various road surfaces.

Did C1200 reset?		 - Go to Step 25. System OK
25 Replace the EBCM. - System OK -
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