【Launch X431 operation guide】The solution of DTC for 2011 Prado ABS system “C120a, ECU initialization is not completed”
Vehicle module: Toyota Prado, 2011 models, VIN=JTEJU3FJXB50*****
This function is used after replacing one of the following components:
1.Calibration yaw rate sensor
3.yaw rate/G sensor
1.The vehicle is on a flat surface
2.Steering wheel is in the front position
3.Gear lever in parking position
4.Turn off the engine
5.Ignition switch is ON
The following shows an example of a C120A fault code after the replacement of the ABS pump assembly by 2011 Prado:
1.Select Toyota V48.53 or later;
2.Select 16PIN diagnostic contactor (Europe and other regions);
3.Select automatic search
4.Select LC PRADO, as picture 2
5.Select Before China 2012.06, as picture 3.
6.The X-431 automatically reads the vehicle information as shown in picture 4,
where VIN = JTEJU3FJXB50 *****
7.Select system selection, as picture 5:
8.Select chassis, as picture 6:
9.Select “ABS (Antilock Braking System) / VSC (Vehicle Stability Control) / TRC (Traction Control)” as shown in Figure 7.
10.Read the DTC, display “C120a, ECU initialization is not completed”, as shown in Figure 8;
11.Let the gear lever in P position, and then turn the knob to the middle position of H4
(high-speed four-wheel drive) and L4 (low-speed four-wheel drive) as shown in figure 9, and then execute the special function of X-431
12.Select special function, as picture 10
13.Select “Auto scan special features”, as picture 11.
14.Select “test mode”, as picture 12
15.Promting:This function is performed when the “ABS ECU” and “Yaw rate/G sensor” are replaced, as picture 13.
16.Tips for test mode operation: make sure that the vehicle is on a flat surface; the steering wheel is in the front position; the shift
lever is in the park position; the engine is not rotating; the ignition switch is in the ON position. As shown in Figure 14;
17.Prompting: the vehicle to stay still for two seconds or longer, as picture 15 shown.
18.Prompting: when the light of vehicle ABS & VSC is flashing, the calibration is completed; if the ABS & VSC lights are not flashing,
please try again”, as shown in Figure 16;
19.Read theDTC again, indicating no fault code, as shown in Figure 17. Start the engine, verify the vehicle, and the instrument will not
turn on the fault light, indicating troubleshooting.