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Home >> Suzuki >> 2006 >> Verona Base >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Abs >> Diagnostic Information and Procedures >> DTC C1201: Left Front Wheel Speed Excessive Variation >> DTC Troubleshooting
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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 DTC C1201 trouble chart.
Did you find problem?		 - Go to Step 3 System OK
3 Was C1200 set as a current or history DTC? - Go to Step 4 Go to Step 5
4 Perform C1200  diagnostic chart prior to performing DTC
C1201 trouble chart.		 - System OK -
5
  1. Ignition switch "OFF".
  2. Inspect the left front wheel speed sensor and jumper harness for damage.
  3. Perform a complete and thorough inspection of the left front wheel speed sensor for damage. (cracks, missing teeth, looseness)

Is any physical damage noted?		 - Go to Step 6 Go to Step 7
6 Repair the damage to the left front wheel speed sensor, jumper harness.
Is the repair completed?		 - System OK -
7
  1. Vehicle in park.
  2. Connect a Scan Tool and select data list.
  3. Monitor the wheel speed sensors.
  4. Start the vehicle, and monitor wheel speed sensors with engine running but vehicle not moving.
  5. Lightly depress the accelerator pedal to increase engine idle speed.

Did C1201 reset or did the left front wheel speed read above 0 mph when the vehicle was in park with the engine running?		 - Go to Step 8 Go to Step 9
8 The cause of C1201 is ignition noise coupled onto the left front speed sensor circuits.
Inspect the routing of the left front wheel speed sensor and/or jumper harness for potential ignition noise sources such as spark plug wires. Reroute wiring as needed.		 - System OK -
9
  1. Scan tool still connected.
  2. Monitor the wheel speed sensors.
  3. Test-drives the vehicle up to the maximum-posted speed limit, and slowly decelerates to zero. Do this several times.

Did C1201 reset or did the left front wheel speed vary more than 5 kph (3 mph) when compared to any one of the other wheels during the drive?		 - Go to Step 11 Go to Step 10
10 DTC C1201 is intermittent. Refer to DIAGNOSTIC AIDS . - System OK -
11
  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 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. Speed sensor still disconnected from the jumper harness.
  2. Connect a voltmeter to terminals 2 and 1 of the left front speed sensor.
  3. Select the AC milli-volt scale.
  4. Spin the left front wheel while observing the voltage on the meter.

Is the AC voltage within the specified range?		 At least 100 mV Go to Step 14 Go to Step 12
14
  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 to wheel speed sensor terminal 2.

Is the resistance within the specified range?		 Less than 2 Ω 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. 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 18 Go to Step 17
17 Repair the open or high resistance between terminals 19 and 1. - System OK -
18
  1. EBCM harness still disconnected from the EBCM.
  2. Jumper harness still disconnected from the wheel speed sensor.
  3. Connect an ohmmeter between EBCM harness terminals 20 and 19.

Is the resistance within the specified range?		 OL (open circuit) Go to Step 20 Go to Step 19
19 Repair the short between the 2 wires. - System OK -
20
  1. Replace the left front jumper harness.
  2. Test-drive the vehicle at various speeds and road surfaces.

Did C1201 reset?		 - Go to Step 20 System OK
21 Replace the EBCM. - System OK -
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