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DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step Action Value(s) Yes No
1 Was the Diagnostic Circuit Check completed? - Go to Step 3 Go to Step 2
2 Perform the DIAGNOSTIC CIRCUIT CHECK  prior to performing this trouble tree.
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 Was DTC C1200 set as a current or history code? - Go to Step 6 Go to Step 7
6 Perform diagnostics for DTC C1200  prior to performing this table. - System OK -
7
  1. Connect a Scan Tool and select data list.
  2. Monitor the wheel speed sensors.
  3. Test-drives vehicle above 24 kph (15 mph) and slowly decelerates to 0, do this several times.

Did C1202 reset or did the left front wheel speed suddenly drop to 0 prior to the vehicle coming to a complete stop?		 - Go to Step 9 Go to Step 8
8 DTC C1202 is intermittent. Refer to DIAGNOSTIC AIDS . - System OK -
9
  1. Ignition switch "OFF".
  2. Raise and suitably support the vehicle.
  3. Disconnect the EBCM harness from the EBCM.
  4. Connect a voltmeter to EBCM harness terminals 19 and 20.
  5. Select the AC milli-volt scale.
  6. Spin the left front wheel while observing the voltmeter. (voltage should increase as wheel speed increases)

Is the AC voltage within the specified range?		 At least 100 mV Go to Step 10 Go to Step 11
10 Replace the EBCM. - System OK -
11
  1. Disconnect the left front jumper harness from the left front wheel speed sensor.
  2. Connect an ohmmeter to terminals 2 and 1 of the left front wheel speed sensor.

Is the resistance within the specified range?		 800 - 1,600 Ω (Resistance will vary with temperature) Go to Step 13 Go to Step 12
12 Replace the left front wheel speed sensor. - System OK -
13
  1. Left front jumper harness still disconnected from the left front speed sensor.
  2. Connect a voltmeter to terminals 2 and 1 of the left front wheel speed sensor.
  3. Select the AC milli-volt scale.
  4. Spin the left front wheel while observing the voltmeter. (voltage should increase as wheel speed increases)

Is the AC voltage within the specified range?		 At least 100 mV Go to Step 14 Go to Step 12
14
  1. Disconnect the left front jumper harness from the wheel speed sensor.
  2. EBCM harness still disconnected from the EBCM.
  3. Connect an ohmmeter to EBCM harness terminals 19 and 20.

Is the Resistance within the specified range?		 OL (open circuit) Go to Step 16 Go to Step 15
15 Find and repair the short between the 2 circuits. - 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 an ohmmeter to EBCM harness terminal 20 and then to wheel speed sensor terminal 2.

Is the resistance within the specified range?		 Less than 2 Ω Go to Step 18 Go to Step 17
17 Repair the open or high resistance between terminals 20 and 2. - 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 19 and then to wheel speed sensor terminal 1.

Is the resistance within the specified range?		 Less than 2 Ω Go to Step 20 Go to Step 19
19 Repair the open or high resistance between terminal 19 and 1. - System OK -
20
  1. Replace the left front wheel speed jumper harness.
  2. Test-drive the vehicle at various speeds and road surfaces.

Did C1202 reset?		 - Go to Step 10 System OK
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