P1631

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P1631: Communication Error from ECM to VSC
P1631 - Communication Error from ECM to VSC

DESCRIPTION

The ECM sends signals such as dynamic radar cruise control operation signals, brake operation demand signals, and buzzer operation demand signals to the skid control ECU when the dynamic radar cruise control is in operation. The ECM is the only component that has a function to record and output the DTCs in the dynamic radar cruise control system. Therefore, if the skid control ECU detects a communication error from the ECM, it sends a malfunction signal back to the ECM.





WIRING DIAGRAM

Refer to DTC P1575 P1575.

INSPECTION PROCEDURE

NOTICE:
When the ECM is replaced with a new one, initialization must be performed Installation.

PROCEDURE

1. READ OUTPUT DTC (DTC P1631)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs Dynamic Radar Cruise Control System.

(e) Perform the following to make sure that the DTC detection conditions are met.

HINT
If the detection conditions are not met, the malfunction cannot be detected.

(1) Drive the vehicle at a speed of 50 km/h (30 mph) or more.

(2) Turn the cruise control main switch on.

(f) Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

(g) Read the DTCs Dynamic Radar Cruise Control System.

Result:





B -- REPLACE ECM

A -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

2. REPLACE ECM

(a) Replace the ECM Removalfor 2GR-FSE, Removal for 4GR-FSE).

NEXT -- Continue to next step.

3. CHECK WHETHER DTC OUTPUT RECURS (DTC P1631)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs Dynamic Radar Cruise Control System.

(e) Perform the following to make sure that the DTC detection conditions are met.

HINT
If the detection conditions are not met, the malfunction cannot be detected.

(1) Drive the vehicle at a speed of 50 km/h (30 mph) or more.

(2) Turn the cruise control main switch on.

(f) Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

(g) Read the DTCs Dynamic Radar Cruise Control System.

Result:





B -- REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Removal

A -- END