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 A/T information signals, 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.
INSPECTION PROCEDURE
HINT
This circuit uses CAN communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system are output.
PROCEDURE
1. READ OUTPUT DTC (DTC P1631)
(a) Clear the DTCs Dynamic Radar Cruise Control System.
(b) 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 for which cruise control operation is possible.
(2) Turn the cruise control main switch on.
(c) Read the DTCs Dynamic Radar Cruise Control System.
OK:
DTC is not output.
NG -- REPLACE ECM
OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
2. REPLACE ECM
(a) Replace the ECM Removal.
NEXT -- Continue to next step.
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P1631)
(a) Clear the DTCs Dynamic Radar Cruise Control System.
(b) 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 for which cruise control operation is possible.
(2) Turn the cruise control main switch on.
(c) Read the DTCs Dynamic Radar Cruise Control System.
OK:
DTC is not output.
NG -- REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Removal
OK -- END