Section 638 (Cruise Control System - Diagnostics): Pre-Check

WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSIS SYSTEM

Description
ECM controls the function of the cruise control on a vehicle.

Data on the cruise control and DTC can be read from DLC3 on the vehicle. If the CRUISE MAIN indicator does not come on after the DTC check, there is a malfunction on the cruise control.

Use the hand-held tester or SST to check and solve the problem.

Check the DLC3.

The vehicle's ECM uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

Fig 1: Checking DLC3 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

SPECIFICATION TERMINAL CONNECTION

Terminal No.	Connection/Specified Condition	Condition
4	Chassis Ground <--> Body Ground/1 Ω or less	Always
7	Bus Line/Pulse Generation	During Communication
16	Battery Positive <--> Body Ground/9 ~ 14 V	Always

HINT:

If the display shows "UNABLE TO CONNECT TO VEHICLE" as connecting the hand-held tester to the DLC3 and turn the ignition switch ON, there is a problem either on the vehicle or on the tool.

If communication is normal when the tool is connected to another vehicle, inspect DLC3 on the original vehicle.
If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.

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.
HINT:

If the indicator check result is not normal, proceed to troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ) for the combination meter section.

Fig 2: Checking Indicator
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check the DTC.
HINT:

If a malfunction occurs in the vehicle speed sensors or the stop lamp switch, etc. during cruise control driving, 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 the memory as a diagnostic trouble code.

Fig 3: Identifying Indicator Light Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check the output of DTC using diagnosis check wire.
1. Turn the ignition switch ON.
2. Using SST, connect terminal Tc and CG of DLC3.
  SST 09843-18040
3. Read the DTC on the CRUISE MAIN indicator light.
  
  Fig 4: Connecting Terminal Tc And CG Of DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If DTC is not indicated, inspect the cruise main indicator light circuit or the diagnosis circuit (See CRUISE MAIN INDICATOR LIGHT CIRCUIT and DIAGNOSIS CIRCUIT ). As an example, the blinking pattern of normal code and code 52 are shown in the illustration.

Fig 5: Identifying Normal Code & Malfunction Code Patterns

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

USING HAND-HELD TESTER
1. Hook up the hand-held tester to the DLC3.
2. Monitor the ECU data by following the prompts on the tester screen.
HINT:

The hand-held tester has a "Snapshot" function which records the monitored data.

Refer to the hand-held tester operator's manual for further details.

DATA LIST

HINT:

Following to the DATA LIST displayed by the hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one of the method to shorten the labor time.

Connect the Hand-held tester to the DLC3.
Turn the ignition switch ON.
According to the display on the tester, read the "DATA LIST".

DIAGNOSTIC NOTE

Item

Measurement Item / Display (Range)

Normal Condition

Diagnostic Note

VEHICLE SPD

Vehicle speed / min.: 0km/h (0mph), max.: 255km/h (158mph)

Actual vehicle speed

MEMORY SPD

Cruise control memorized speed / min.: 0km/h (0mph), max.: 255km/h (158mph)

Memorized speed: Cruise control activated

THROTTLE

Required throttle opening angle / min.: 0°, max.: 125°

Required throttle opening angle (0° - 84°): Cruise control activated

CCS READY S

Cruise control system stand by condition (Sub CPU) / ON or OFF

ON <--> OFF: Change ON/OFF each time Main SW is pressed in.

"1"

CCS READY M

Cruise control system stand by condition (Main CPU) / ON or OFF

ON <--> OFF: Change ON/OFF each time Main SW is pressed in.

"1"

CANCEL SW

CANCEL SW signal / ON or OFF

ON: CANCEL SW ONOFF: CANCEL SW OFF

SET/COAST SW

SET/COAST SW signal / ON or OFF

ON: SET/COAST SW ON OFF: SET/COAST SW OFF

RES/ACC SW

RES/ACC SW signal / ON or OFF

ON: RES/ ACC SW ONOFF: RES/ACC SW OFF

STP LIGHT SW1 M

Stop light SW signal (Main CPU) / ON or OFF

ON: Brake pedal depressedOFF: Brake pedal released

STP LIGHT SW2 S

Stop light SW signal (Sub CPU) / ON or OFF

ON: Brake pedal depressed OFF: Brake pedal released

STP LIGHT SW1 S

Stop light SW signal (Sub CPU) / ON or OFF

ON: Brake pedal depressedOFF: Brake pedal released

SHIFT D POS

PNP SW signal (D position) / ON or OFF

ON: Shift D positionOFF: Except shift D position

CRUISE CTRL

Cruise control system active condition / ON or OFF

ON: Cruise control activated OFF: Cruise control inactivated

CCS INDICATOR M

Cruise indicator signal (Main CPU) / ON or OFF

ON: "CCS READY" ON OFF: "CCS READY" OFF

"2"

CCS INDICATOR S

Cruise indicator signal (Sub CPU) / ON or OFF

ON: "CCS READY" ON OFF: "CCS READY" OFF

"2"

MAIN SW (SUB)

Main SW signal (Sub CPU) / ON or OFF

ON: Main SW ON (Pressed in)OFF Main SW OFF (Pressed out)

"3"

MAIN SW (MAIN

Main SW signal (Main CPU) / ON or OFF

ON: Main SW ON (Pressed in)OFF Main SW OFF (Pressed out)

"3"

⁽¹⁾	"3" is OK but "1" is NG --> ECM failure

⁽²⁾	"1" is OK but "2" is NG --> DTC output or ECM failure

⁽³⁾	"3" is OK but cruise indicator does not turn on --> Indicator or W/H or ECM failure

DTC CLEAR
1. Following actions will erase DTC and the freeze frame data.
  1. Hand-Held Tester:
    Operating the hand-held tester to erase the codes.
  2. Except Hand-Held Tester:
    Disconnecting the battery terminals or EFI fuse.
2. After completing repairs, DTC retained in the memory can be cleared by removing the EFI fuse for 1 minutes or more with the ignition switch off.
3. Check that the normal code is displayed after connecting the fuse.
PROBLEM SYMPTOM CONFIRMATION (ROAD TEST)
1. Inspect the SET switch.
  1. Push the main switch button to ON.
  2. Drive at a desired speed (40 km/h (25 mph) or higher).
  3. Push down the control switch to the SET/COAST.
  4. After releasing the switch, check that the vehicle cruises at the desired speed.
    
    Fig 6: Problem Symptom Confirmation (Road Test - SET Switch)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the ACCEL switch.
  1. Push the main switch button to ON.
  2. Drive at a desired speed (40 km/h (25 mph) or higher).
  3. Check that the vehicle speed increase while the control switch is pulled up to RES/ACC, and that the vehicle cruises at the set speed when the switch is released.
  4. Momentarily push 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).
    
    Fig 7: Problem Symptom Confirmation (Road Test - ACCEL Switch)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect the COAST switch.
  1. Push the main switch button to ON.
  2. Drive at a desired speed (40 km/h (25 mph) or higher).
  3. Check that the vehicle speed decrease while the control switch is pushed down to SET/COAST, and the vehicle cruises at the set speed when the switch is released.
    
    Fig 8: Problem Symptom Confirmation (Road Test - Coast Switch)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Momentarily push the control switch downward to SET/COAST, and then immediately release it. Check that the vehicle speed decrease by about 1.5 km/h (Tap-down function).
4. Inspect the CANCEL switch.
  1. Push the main switch button to 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
    - Depress the clutch pedal (M/T)
    - Shift to except D position (A/T)
    - Push the main switch button to OFF
    - Pull the cruise control switch to CANCEL
      
      Fig 9: Problem Symptom Confirmation (Road Test - Cancel Switch)
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Inspect the RESUME switch.
  1. Push the main switch button to ON.
  2. Drive at 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
    - Depress the clutch pedal (M/T)
    - Shift to except D position (A/T)
    - Push the main switch button to OFF
  4. After pulling up the control switch 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.
    
    Fig 10: Problem Symptom Confirmation (Road Test - Resume Switch)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INPUT SIGNAL CHECK (Using hand-held tester)
1. Connect the hand-held tester to DLC3
2. Check the control switch (MAIN, CANCEL, SET/COAST, RES/ACC).
  
  Fig 11: Checking Input Signal Check
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002