Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2011LANDCRUISER V8-5.7L (3UR-FE)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONC CODE CHARTSC1AEC
2011 Toyota Landcruiser V8-5.7L (3UR-FE)
C1AEC
2011 Toyota Landcruiser V8-5.7L (3UR-FE)SECTION C1AEC
PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: C1AEC: Front Sensor Communication Malfunction
C1AEC - Front Sensor Communication Malfunction
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.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK DTC OUTPUT
(a) Clear the DTCs Intuitive Parking Assist System.
(b) Check for DTCs Intuitive Parking Assist System.
Result
B -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
A -- Continue to next step.
2. CHECK CLEARANCE WARNING ECU
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE CLEARANCE WARNING ECU Removal
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR LH - CLEARANCE WARNING ECU)
(a) Disconnect the B4 sensor connector.
(b) Disconnect the F12 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR LH - NO. 1 ULTRASONIC SENSOR RH)
(a) Disconnect the B4 and B3 sensor connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK DTC OUTPUT
(a) Clear the DTCs Intuitive Parking Assist System.
(b) Check for DTCs Intuitive Parking Assist System.
Result
B -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
A -- Continue to next step.
6. REPLACE NO. 1 ULTRASONIC SENSOR LH
(a) Replace the No. 1 ultrasonic sensor LH with a normally functioning sensor Removal.
NEXT -- Continue to next step.
7. CHECK DTC OUTPUT
(a) Clear the DTCs Intuitive Parking Assist System.
(b) Check for DTCs Intuitive Parking Assist System.
Result
B -- END (NO. 1 ULTRASONIC SENSOR LH IS DEFECTIVE)
A -- Continue to next step.
8. REPLACE NO. 1 ULTRASONIC SENSOR RH
(a) Replace the No. 1 ultrasonic sensor RH with a normally functioning sensor Removal.
NEXT -- Continue to next step.
9. CHECK DTC OUTPUT
(a) Clear the DTCs Intuitive Parking Assist System.
(b) Check for DTCs Intuitive Parking Assist System.
Result
B -- END (NO. 1 ULTRASONIC SENSOR RH IS DEFECTIVE)
A -- REPLACE CLEARANCE WARNING ECU Removal
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.