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 is the only component that has a function to store and output 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

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

PROCEDURE

1. REPLACE ECM

(a) Replace the ECM Removal.

NEXT -- Continue to next step.

2. CHECK FOR DTC

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

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

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

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

(2) Turn the cruise control switch on.

(c) Check for DTCs Dynamic Radar Cruise Control System.

OK:

DTC P1631 is not output.

NG -- REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU) Disassembly

OK -- END (ECM IS DEFECTIVE)