Displaying & Reading Trouble Codes

NOTE: This is the only information provided by the manufacturer for reading Diagnostic Trouble Codes for this system.

PRE-CHECK




1. DIAGNOSIS SYSTEM
a. Check the indicator.
1. Turn the ignition switch to ON.
2. Check that the CRUISE MAIN indicator light comes on when the cruise control main switch is turned on, and that the indicator light goes off when the main switch is turned OFF.

HINT: If the indicator check result is not normal, proceed to troubleshooting for the combination meter.




b. Check the DTC.

HINT: If a malfunction occurs in the No.1 vehicle speed sensors or actuator, etc. during cruise control driving, the ECU actuates AUTO CANCEL of the cruise control and turns ON and OFF the CRUISE MAIN indicator light to inform the driver of a malfunction. At the same time, the malfunction is stored in memory as a diagnostic trouble code.




c. Output DTC using diagnosis check wire.
1. Turn the ignition switch ON.
2. Using SST, connect terminals Tc and E1 of DLC2
SST 09843-18020
3. Read the DTC on the CRUISE MAIN indicator light.






HINT:
- If the DTC is not output, inspect the diagnosis circuit.
- As an example, the blinking patterns for codes; normal, 11 and 21 are shown in the illustration.




2. USING LEXUS HAND-HELD TESTER
a. Hook up the LEXUS hand-held tester to the DLC2.
b. Monitor the ECU data by following the prompts on the tester screen.

HINT:
LEXUS hand-held tester has a "Snapshot" function which records the monitored data.
Please refer to the LEXUS hand-held tester operator's manual for further details.




4. PROBLEM SYMPTOM CONFIRMATION (ROAD TEST)
a. Inspect the SET switch.
1. Push the main switch ON.
2. Drive at a desired speed (40 km/h (25 mph) or higher).
3. Press the control switch to the SET/COAST.
4. After releasing the switch, check that the vehicle cruises at the desired speed.




b. Inspect the ACCEL switch
1. Push the main switch ON.
2. Drive at a desired speed (40 km/h (25 mph) or higher).
3. Check that the vehicle speed is increases while the control switch is turned to RES/ACC, and that the vehicle cruises at the set speed when the switch is released.
4. Momentarily press the control switch upward in the RES/ACC and then immediately release it. Check that the vehicle speed increases by about 1.5 km/h (Tap-up function).




c. Inspect the COAST switch.
1. Push the main switch ON.
2. Drive at a desired speed (40 km/h (25 mph) or higher).
3. Check that the vehicle speed is decreases while the control switch is turned to SET/COAST, and the vehicle cruises at the set speed when the switch is released.
4. Momentarily press the control switch is turned to SET/COAST, and then immediately release it. Check that the vehicle speed decreases by about 1.5 km/h (Tap-down function).




d. Inspect the CANCEL switch.
1. Push the main switch ON.
2. Drive at a desired speed (40 km/h (25 mph) or higher).
3. When operating one of the followings, check that the cruise control system is cancelled and that the normal driving mode is reset.
- Depress the brake pedal
- Shift to except D position
- Push the main switch OFF
- Pull the cruise control switch to CANCEL




e. Inspect the RESUME switch.
1. Push the main switch ON.
2. Drive at a desired speed (40 km/h (25 mph) or higher).
3. When operating one of the followings, check that the cruise control system is cancelled and that the normal driving mode is reset.
- Depress the brake pedal
- Shift to except D position
- Push the main switch OFF
- Pull the cruise control switch to CANCEL
4. After the control switch is turned to RES/ACC at the driving speed of more than 40 km/h (25 mph), check that the vehicle restores the speed prior to the cancellation.







5. INPUT SIGNAL CHECK

HINT:
1. For check No.1 -No.3:
- Turn ignition switch ON.

2. For check No.4:
- Jack up the vehicle.
- Start the engine.
- Shift to D position.

a. Press the control switch to SET/COAST or RES/ACC position and hold it down or hold it up "1".
b. Push the main switch ON "2".
c. Check that the CRUISE MAIN indicator light blinks twice or 3 times repeatedly after 3 seconds.
d. Turn the SET/COAST or RES/ACC switch OFF.
e. Operate each switch as listed in the table below.
f. Read the blinking pattern of the CRUISE MAIN indicator light.
g. After performing the check, turn the main switch OFF.

HINT: When 2 or more signals are input to the ECU, the lowest numbered code will be displayed first.