Toyota Yaris: Vehicle Stability Control System / ABS Pump Motor Actuator Stuck (C142771)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| C142771 | ABS Pump Motor Actuator Stuck | Actuator pump motor does not operate properly. |
| Brake |
WIRING DIAGRAM
Refer to DTC C052C13.
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CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
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PROCEDURE
| 1. | PERFORM ACTIVE TEST USING GTS (MOTOR RELAY) |
(a) Perform the Active Test of the motor relay using the GTS.
Chassis > Brake > Active Test| Tester Display | Measurement Item | Control Range | Restrict Condition | Diagnostic Note |
|---|---|---|---|---|
| Motor Relay | ABS motor relay | OFF / ON | Vehicle condition: Vehicle stopped HINT: To protect this Actuator and Solenoid, this test will only last 5 seconds. | - |
| Tester Display |
|---|
| Motor Relay |
(b) Check the operating sound of the pump motor when operating it using the GTS.
| Result | Proceed to |
|---|---|
| Operating sound is heard | A |
| Operating sound is not heard | B |
| B |
 | GO TO STEP 4 |
|
| 2. | CLEAR DTC |
(a) Operate the GTS to clear the codes.
Chassis > Brake > Clear DTCs(b) Press the DTC clear button.
(c) Turn the ignition switch off.
|
| 3. | RECONFIRM DTC |
(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
(b) Operate the GTS to read the DTCs.
Chassis > Brake > Trouble Codes(c) Check if the same DTC is output.
| Result | Proceed to |
|---|---|
| C142771 is not output | A |
| C142771 is output | B |
HINT:
- If a speed signal of 20 km/h (12 mph) or more is input to the skid control ECU (brake actuator assembly) with the ignition switch ON and the stop light switch assembly off, the ECU performs self-diagnosis of the pump motor circuit.
- If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake actuator assembly).
- If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
- If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.
| A |
 | USE SIMULATION METHOD TO CHECK |
| B |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
| 4. | CHECK HARNESS AND CONNECTOR (GND2 TERMINAL) |
(a) Turn the ignition switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A108 skid control ECU (brake actuator assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A108-1 (GND2) - Body ground | 1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal | Below 1 Ω |
| OK |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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The fuel gauge shows approximately how much fuel is remaining in the tank when the ignition is switched ON. We recommend keeping the tank over 1/4 full.
