Trouble Shooting: Pre-Check

Diagnose System :
1. Check the indicator:
  1. Turn the ignition switch 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. See Figure.
2. Check the DTC:
3. Output a DTC using diagnosis check wire:
  1. Turn the ignition switch ON.
  2. Using SST, connect terminals Tc and E1 of the DLC1. See Fig 5. SST 09843-18020.
  3. Read the DTC on the CRUISE MAIN indicator light. See Figure.
ECU Terminal Values Measurement By Using Toyota Break-Out-Box And Toyota Hand-Held Tester See Fig 4
1. Connect the TOYOTA break-out-box and TOYOTA hand-held tester to the vehicle.
2. Read the ECU input/output values by following the prompts on the tester screen.
3. TOYOTA hand-held tester has a "Snapshot" function. This records the measured valves and is effective in the diagnosis of intermittent problems. Please refer to the TOYOTA hand-held tester/TOYOTA break-out-box operator's manual for further details.

NOTE: TOYOTA hand-held tester has a "Snapshot" function which re- cords the monitored data.
Please refer to the TOYOTA hand-held tester operator's manual for further details.

Using Toyota Hand-Held Tester :
1. Connect the TOYOTA hand-held tester to the DLC1.
2. Monitor the ECU data by following the prompts on the tester screen.

NOTE: During in the erase mode, diag detection does not work.

Erase Mode (DTC Clearance) :
1. Drive at about 15 km/h or below.
2. Using SST, connect terminals Tc and E1 of DLC1. See Fig 6. SST 09843-18020.
3. Pull the cruise control switch to CANCEL.
4. On the above mentioned condition, turn on the cruise control main switch 5, times within 3 seconds.
Road Test: Problem Symptom Confirmation :
1. Inspect the SET switch, see Figure:
  1. Push the main switch ON. See Figure.
  2. Drive at a desired speed (25 mph (40 km/h). or higher).
  3. Press the control switch to the SET/COAST. See Figure.
  4. After releasing the switch, check that the vehicle cruises at the desired speed.
2. Inspect the ACCEL switch:
  1. Push the main switch ON. See Figure.
  2. Drive at a desired speed (25 mph (40 km/h). or higher).
  3. Check that the vehicle speed increases while the control switch is turned to RES/ACC, and that the vehicle cruises at the set speed when the switch is released. See Figure.
  4. Momentarily raise the control switch upward for RES/ACC and then immediately release it. Check that the vehicle speed increases by about 1.5 Km/h (Tap-up function).
3. Inspect the COAST switch:
  1. Push the main switch ON. See Figure.
  2. Drive at a desired speed 25 mph (40 km/h) or higher.
  3. Check that the vehicle speed decreases while the control switch is turned to SET/COAST, and the vehicle cruises at the set speed when the switch is released. See Figure.
  4. Momentarily push the control switch downward for SET/COAST, and then immediately release it. Check that the vehicle speed decreases by about 1.5 km/h (Tap-down function).
4. Inspect the CANCEL switch:
  1. Push the main switch ON. See Figure.
  2. Drive at a desired speed 25 mph (40 km/h) 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.
    
    . Depress the clutch pedal (M/T).
    
    . Shift to except "D" position (A/T).
    
    . Push the main switch OFF.
    
    . Pull the cruise control switch for CANCEL.
5. Inspect the RESUME switch:
  1. Push the main switch ON. See Figure.
  2. Drive at a desired speed 25 mph (40 km/h) or higher.
  3. When operating one of the following operations, check that the cruise control system is cancelled and that the normal driving mode is reset:
    . Depress the brake pedal.
    
    . Depress the clutch pedal (M/T).
    
    . Shift to except "D" position (A/T).
  4. After the control switch is turned to RES/ACC at the driving speed of more than 25 mph (40 km/h), check that the vehicle restores the speed prior to the cancellation.

NOTE: When 2 or more signals are input to the ECU, the lowest numbered code will be displayed 1 st.

For check No. 1- 3, Turn ignition switch ON.

For check No.4 Jack up the vehicle, Start the engine, Shift to D position.

Input Signal Check . See Fig 8.
1. Press the control switch to SET/COAST or RES/ACC position and hold it down or hold it up as "1".
2. Push the main switch ON as "2".
3. Check that the CRUISE MAIN indicator light blinks twice or 3 times repeatedly after 3 seconds.
4. Turn the SET/COAST or RES/ACC switch OFF.
5. Operate each switch as listed in the table below.
6. Read the blinking pattern of the CRUISE MAIN indicator light.
7. After performing the check, turn the main switch OFF.

Problem Symptoms Table

Symptom

Suspect Area

See

SET not occurring or CANCEL occurring. (DTC is Normal)

.....

Main Switch Circuit (Cruise control switch)

⁽¹⁾

.....

Vehicle Speed Sensor

⁽²⁾

.....

Control Switch Circuit (Cruise control switch)

⁽³⁾

.....

Stop Light Switch Circuit

⁽⁴⁾

.....

Park/Neutral Position Switch Circuit

⁽⁵⁾

.....

Clutch Switch

⁽⁶⁾

.....

Actuator Motor Circuit

⁽⁷⁾

.....

Cruise Control Cable

⁽⁸⁾

.....

Cruise Control ECU

⁽⁹⁾

SET not occurring or CANCEL occurring. (DTC dose not output)

.....

ECU Power Source Circuit

⁽¹⁰⁾

.....

Cruise Control ECU

⁽⁹⁾

Actual vehicle speed deviates above or below the set speed.

.....

Cruise Control Cable

⁽⁸⁾

.....

Vehicle Speed Signal Abnormal

⁽¹¹⁾

.....

Electronically Controlled Transmission Communication Circuit

⁽¹²⁾

.....

Actuator Motor Circuit

⁽⁷⁾

.....

Idle Signal Circuit (Main throttle position sensor)

⁽¹³⁾

.....

Cruise Control ECU

⁽⁹⁾

Gear shifting frequent between 3rd & O/D when driving on uphill road. (Hunting).

.....

Electronically Controlled Transmission Communication Circuit

⁽¹²⁾

.....

Cruise Control ECU

⁽⁹⁾

Cruise control not cancelled, even when brake pedal is depressed.

.....

Cruise Control Cable

⁽⁸⁾

.....

Stop Light Switch Circuit

⁽⁴⁾

.....

Actuator Motor Circuit

⁽⁷⁾

.....

Cruise Control ECU

⁽⁹⁾

Cruise control not cancelled, even when transmission is shifted to "N" position.

.....

Cruise Control Cable

⁽⁸⁾

.....

Park/Neutral Position Switch Circuit

⁽⁵⁾

.....

Actuator Motor Circuit

⁽⁷⁾

.....

Cruise Control ECU

⁽⁹⁾

Cruise control not cancelled, even when clutch pedal is depressed.

.....

Cruise Control Cable

⁽⁸⁾

.....

Clutch Switch Circuit

⁽⁶⁾

.....

Actuator Motor Circuit

⁽⁷⁾

.....

Cruise Control ECU

⁽⁹⁾

Control switch does not operate. (SET/COAST, ACC/RES, CANCEL impossible)

.....

Cruise Control Cable

⁽⁸⁾

.....

Control Switch Circuit

⁽³⁾

.....

Actuator Motor Circuit

⁽⁷⁾

.....

Cruise Control ECU

⁽⁹⁾

SET possible at 25 mph or less, or CANCEL does not operate at 25 mph or less.

.....

Cruise Control Cable

⁽⁸⁾

.....

Vehicle Speed Signal Abnormal

⁽¹¹⁾

.....

Actuator Motor Circuit

⁽⁷⁾

.....

Cruise Control ECU

⁽⁹⁾

Poor response is in ACCEL and RESUME modes.

.....

Cruise Control Cable

⁽⁸⁾

.....

Electronically Controlled Transmission Communication Circuit

⁽¹²⁾

.....

Actuator Motor Circuit

⁽⁷⁾

.....

Cruise Control ECU

⁽⁹⁾

O/D does not resume, even though the road is not uphill.

.....

Electronically Controlled Transmission Communication Circuit

⁽¹²⁾

.....

Cruise Control ECU

⁽⁹⁾

DTC memory is erased.

.....

Cruise Control ECU

⁽⁹⁾

DTC is not output, or is output when should not be

.....

Diagnosis Circuit

⁽¹⁴⁾

.....

Cruise Control ECU

⁽⁹⁾

Cruise MAIN indicator light remains ON or falls to light up

.....

Cruise MAIN Indicator Light Switch Circuit

⁽¹⁵⁾

⁽¹⁾	Main Switch Circuit (Cruise Control Switch)

⁽²⁾	DTC 21: OPEN IN VEHICLE SPEED SENSOR CIRCUIT

⁽³⁾	DTC 32: CONTROL SWITCH CIRCUIT (CRUISE CONTROL SWITCH)

⁽⁴⁾	Stop Light Switch Circuit

⁽⁵⁾	Park/Neutral Position Switch Circuit

⁽⁶⁾	Clutch Switch Circuit

⁽⁷⁾	DTCs 11 & 15: ACTUATOR MOTOR CIRCUIT

⁽⁸⁾	Actuator Control Cable

⁽⁹⁾	See How To Troubleshoot ECU Controlled Systems

⁽¹⁰⁾	ECU Power Source Circuit

⁽¹¹⁾	DTC 23: VEHICLE SPEED SENSOR ABNORMAL

⁽¹²⁾	Electronically Controlled Transmission Communication Circuit

⁽¹³⁾	DTC 51: IDLE SIGNAL CIRCUIT

⁽¹⁴⁾	Diagnosis Circuit

⁽¹⁵⁾	CRUISE MAIN INDICATOR LIGHT

Fig 1: Checking Indicator Light DTC

Fig 2: Customer Problem Analysis (Cruise Control System Check List)

Fig 3: Trouble Shooting Flow Chart

Fig 4: Connecting Toyota Hand Held Tester

Fig 5: Identifying DLC1 Terminals

Fig 6: Identifying DTC Clearance Procedure

Fig 7: Diagnostic Trouble Code Chart

Fig 8: Input Signal Chart