DESCRIPTION
This DTC is stored when there is an open or short circuit in the communication line between the front sensors and the ECU, or when there is a malfunction in a front sensor.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1AEC |
An open or short circuit in the communication line between the front sensors and ECU or a malfunction in a front sensor during initialization mode after the engine switch is turned on (IG). |
|
WIRING DIAGRAM
PROCEDURE
1. |
CHECK DTC OUTPUT (C1AEC) |
(a) Check for DTCs (See page ).
(b) Clear the DTCs (See page ).
(c) Recheck for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC C1AEC is output |
A |
No DTCs are output |
B |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
|
2. |
CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT LEFT SENSOR) |
(a) Disconnect the D79 clearance warning ECU assembly connector.
(b) Disconnect the A54 No. 1 ultrasonic sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D79-4 (BOF) - A54-1 (BI) |
Always |
Below 1 Ω |
D79-8 (SOF) - A54-3 (SI) |
Always |
Below 1 Ω |
D79-6 (E5) - A54-5 (EI) |
Always |
Below 1 Ω |
D79-4 (BOF) - Body ground |
Always |
10 kΩ or higher |
D79-8 (SOF) - Body ground |
Always |
10 kΩ or higher |
D79-6 (E5) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK HARNESS AND CONNECTOR (FRONT LEFT SENSOR - FRONT RIGHT SENSOR) |
(a) Disconnect the A55 No. 1 ultrasonic sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A54-2 (BO) - A55-1 (BI) |
Always |
Below 1 Ω |
A54-4 (SO) - A55-3 (SI) |
Always |
Below 1 Ω |
A54-6 (EO) - A55-5 (EI) |
Always |
Below 1 Ω |
A54-2 (BO) - Body ground |
Always |
10 kΩ or higher |
A54-4 (SO) - Body ground |
Always |
10 kΩ or higher |
A54-6 (EO) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
INSPECT NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG | ![]() |
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) |
|
5. |
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) |
|
6. |
CHECK DTC OUTPUT (C1AEC) |
(a) Clear the DTCs (See page ).
(b) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC C1AEC is output |
A |
No DTCs are output |
B |
B | ![]() |
END |
|
7. |
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR) |
|
8. |
CHECK DTC OUTPUT (C1AEC) |
(a) Clear the DTCs (See page ).
(b) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC C1AEC is output |
A |
No DTCs are output |
B |
A | ![]() |
REPLACE CLEARANCE WARNING ECU ASSEMBLY |
B | ![]() |
END |
Removal
REMOVAL
PROCEDURE
1. REMOVE REAR DOOR SCUFF PLATE
2. DISCONNECT REAR DOOR OPENING TRIM WEATHERSTRIP
(a) Remove the rear part of the rear door opening trim weatherstrip to
the extent that allows removal of the deck trim side panel assembly ...
Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter
DESCRIPTION
for Automatic Sound Levelizer (ASL):
This circuit is necessary for the Automatic Sound Levelizer (ASL) built
into the radio and display receiver assembly.
The Automatic Sound Levelizer (ASL) function automatically adjusts the
a ...
If the shift lever cannot be shifted from “P”
If the shift lever cannot be shifted with your foot on the brake, there may
be a problem with the shift lock system (a system to prevent accidental operation
of the shift lever). Have the vehicle inspected by your Toyota dealer immediately.
The following ...