P1616

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P1616: Communication Error from ECM to Distance Control ECU
P1616 - Communication Error from ECM to Distance Control ECU

DESCRIPTION

The ECM receives signals from each sensor and ECU, then sends signals such as A/T signals, cruise control operation signals, low speed operation signals, brake control operation signals, and radar light emission prohibiting signals, to the distance control ECU. 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 distance control ECU detects a communication error from the ECM, it sends a malfunction signal back to the ECM.





INSPECTION PROCEDURE

NOTICE:
When the distance control ECU is replaced with a new one, Initialization must be performed Installation.

PROCEDURE

1. READ OUTPUT DTC (P1616)

(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 P1616)

(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 DISTANCE CONTROL ECU Removal

OK -- END