DESCRIPTION
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
C120B |
IG Supply Voltage Low |
Master cylinder pressure sensor power supply voltage decrease occurs or history of voltage decrease exists, and defective master cylinder pressure sensor output continues for 1 second or more. |
|
WIRING DIAGRAM
Refer to DTC C1417 (See page ).
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (+BS TERMINAL) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector. |
|
(b) Disconnect the skid control ECU (brake actuator assembly) connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
S1-38 (+BS) - Body ground |
Always |
11 to 14 V |
S1-38 (+BS) - S1-25 (GND1) |
Always |
11 to 14 V |
*a |
Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly]) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS CIRCUIT) |
|
2. |
RECONFIRM DTC |
(a) Reconnect the S1 skid control ECU (brake actuator assembly) connector.
(b) Clear the DTCs (See page
).
(c) Check if the same DTC is recorded (See page
).
Result |
Proceed to |
---|---|
DTC C120B is not output. |
A |
DTC C120B is output. |
B |
A | ![]() |
USE SIMULATION METHOD TO CHECK |
B | ![]() |
REPLACE BRAKE ACTUATOR ASSEMBLY |
Front Door Courtesy Switch
Inspection
INSPECTION
PROCEDURE
1. INSPECT FRONT DOOR COURTESY SWITCH
(a) Check the resistance.
(1) Measure the resistance using an ohmmeter, and check the results in accordance
with the value( s) in the table below.
Standard:
Tester Connection
Condition
...
Inspection
INSPECTION
PROCEDURE
1. INSPECT BRAKE BOOSTER PUMP ASSEMBLY
(a) Connect the positive (+) lead from the battery to the red cable of the pump,
and the negative (-) lead to the black cable.
(b) Check the brake booster pump operation.
OK:
Operation sound is heard. ...
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) The certification ECU (smart key ECU assembly) and ECM control the vehicle
engine immobiliser system functions. Engine immobiliser system data and Diagnostic
Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3).
In some cases, a ...