Lexus IS250 IS220d GSE20 ALE20 - CRUISE CONTROL
DTC P1631 Communication Error from ECM to VSC
DTC U0100 Lost Communication with ECM/PCM "A"
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.
| DTC No. | DTC Detection Condition | Trouble Area |
| P1631 | While the dynamic radar cruise control is either preparing for operation or operating, if the ECM continuously receives a logical error signal from the skid control ECU for a certain amount of time, the ECM records this logical error code | Communication circuit ECM ABS & traction actuator (Skid control ECU) |
| U0100 | While the dynamic radar cruise control is either preparing for operation or operating, if the ECM continuously receives a communication cut off signal from the ABS & traction actuator (skid control ECU) for a certain amount of time, the ECM records this communication cut off code | Communication circuit ECM ABS & traction actuator (Skid control ECU) |
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.
| 1.CHECK CAN COMMUNICATION SYSTEM |
Refer to HOW TO PROCEED WITH TROUBLESHOOTING.
for LHD:
for RHD: