DTC C1A40: ENG / EHV Device [09/2014 - 10/2015]: Procedure

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] ).
2. Make sure the following conditions are met:

   HINT: 

   If the detection conditions are not met, the system cannot detect malfunctions.

   • Pre-collision system:

     The engine switch is on (IG).

   • Radar cruise control system:

     The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

3. Check for DTCs (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] ).

   OK

   Engine control system DTCs are not output.

Result: 

NG 

GO TO SFI SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015] )

Result: 

OK 

See step  2

1. Clear the DTCs.

   for A760H: (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] )

   for AA81E: (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] )

2. Make sure the following conditions are met:

   HINT: 

   If the detection conditions are not met, the system cannot detect malfunctions.

   • Pre-collision system:

     The engine switch is on (IG).

   • Radar cruise control system:

     The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

3. Check for DTCs.

   for A760H: (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] )

   for AA81E: (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] )

   OK

   ECT system DTCs are not output.

   RESULT
   
   

   Result	Proceed to
   OK	A
   NG (for A760H)	B
   NG (for AA81E)	C

Result: 

B 

GO TO AUTOMATIC TRANSMISSION SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015] )

Result: 

C 

GO TO AUTOMATIC TRANSMISSION SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015] )

Result: 

A 

See step  3

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] ).
2. Make sure the following conditions are met:

   HINT: 

   If the detection conditions are not met, the system cannot detect malfunctions.

   • Pre-collision system:

     The engine switch is on (IG).

   • Radar cruise control system:

     The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

3. Check for DTCs (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] ).

   OK

   DTC C1A40 is not output.

Result: 

OK 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015] )

Result: 

NG 

See step  4

1. Replace the driving support ECU with a new one (Refer to REMOVAL [09/2014 - 10/2015] ).
   NOTE:

   When replacing the driving support ECU, always replace it with a new one and be sure to perform initialization (Refer to INITIALIZATION [09/2014 - 10/2015] ). If an ECU which was installed to another vehicle is used, the information stored in the ECU will not match the information from the vehicle, and as a result, a DTC may be stored.

Result: 

NEXT 

See step  5

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] ).
2. Make sure the following conditions are met:

   HINT: 

   If the detection conditions are not met, the system cannot detect malfunctions.

   • Pre-collision system:

     The engine switch is on (IG).

   • Radar cruise control system:

     The vehicle is being driven at a speed of approximately 50 km/h (31 mph) or more and the distance control switch is on.

3. Check for DTCs (Refer to DTC CHECK / CLEAR [09/2014 - 10/2015] ).

   OK

   DTC C1A40 is not output.

Result: 

OK 

END (DRIVING SUPPORT ECU WAS DEFECTIVE) 

Result: 

NG 

REPLACE ECM 

(Refer to REMOVAL [09/2014 - 10/2015] )