CRUISE CONTROL: DYNAMIC LASER CRUISE CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 C
Service Category: Engine/Hybrid System	Section: Cruise Control
Model Year: 2008	Model: Sequoia	Doc ID: RM000000ZK500XX
Title: CRUISE CONTROL: DYNAMIC LASER CRUISE CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

P1631

Communication Error from ECM to VSC

DESCRIPTION

The ECM sends signals such as A/T information signals, dynamic laser cruise control operation signals, brake operation demand signals, and buzzer operation demand signals to the skid control ECU when the dynamic laser cruise control is in operation. The ECM is the only component that has a function to record and output the DTCs in the dynamic laser 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 laser cruise control is either preparing for operation or operating, if the ECM continuously receives a logical error signal from the skid control ECU for 1.0 seconds, the ECM records this logical error code	Communication circuit ECM 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.

NOTICE:

When the distance control ECU and ECM is replaced with a new one, initialization must be performed .

PROCEDURE

1.	REPLACE ECM

(a) Replace the ECM.

for 2UZ-FE .
for 3UR-FE .

2.	PERFORM INITIALIZATION

(a) Perform initialization .

(1) Turn the ignition switch to ON.

(2) Turn the cruise control main switch on.

(3) With the brake pedal depressed, push the cruise control main switch to + (ACCEL)/RES (RESUME) 3 times within 3 seconds. Check that the skid control buzzer sounds at this time.

NOTICE:

Do not turn the light control switch on at this time because the beam axis automatic adjustment mode has already started, which could lead to incorrect beam axis. If the light control switch is turned on by mistake, readjust the beam axis (refer to Beam Axis Adjustment) .
If initialization cannot be performed, first inspect the stop light switch circuit, cruise main switch circuit, and skid control buzzer circuit.

CLEAR DTC

(a) Clear the DTC .

4.	CHECK FOR DTC

(a) Reproduce the DTC detection conditions under which the DTC is stored.

HINT:

If the DTC detection conditions are not correct, the system will not detect the trouble.

(b) Drive the vehicle at a speed of 45 km/h (28 mph) or more and turn the cruise control main switch ON. Push the -SET switch to activate the cruise control system.

OK:

P1631 is not output.