Customer Problem Analysis Check

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Customer Problem Analysis Check Sheet

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PRE-CHECK

DIAGNOSIS SYSTEM

Description
ECM controls the function of cruise control on this vehicle. Data of the cruise control or DTC can be read from DLC3 of the vehicle. When a trouble occurs on cruise control, check CRUISE MAIN indicator does not come on but DTC inspection is performed.

Therefore when there seems to be a trouble on cruise control, use hand-held tester or SST to check and troubleshoot it.

Fig 2: Connecting Hand-Held Tester To DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 3: Identifying DLC3 Connector Terminals

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TERMINAL CONDITION

Terminal No.	Connection/Specified Condition	Condition
4	Chassis Ground <--> Body Ground/1 or less	Always
13	TC <--> Body Ground/9 -14 V	Always

HINT:

If the display shows "UNABLE TO CONNECT TO VEHICLE" when the cable of the hand-held tester is connected to DLC3, the ignition switch is turned ON and the hand-held tester is operated, there is a problem either on the vehicle side or the tool side.

If communication is normal when the tool is connected to another vehicle, inspect DLC3 on the original vehicle.
If communication does not function 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 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 (See PROBLEM SYMPTOMS TABLE ) for the COMBINATION METER section.
Check the DTC.
HINT:

If a malfunction occurs in the speed sensor or stop light switch, etc. during cruise control driving, the ECM 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.

Fig 4: Identifying CRUISE MAIN Indicator Light
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Fig 5: Identifying Indicator Light Blinking Pattern
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Output DTC using diagnosis check wire.

Turn the ignition switch ON.
Using SST, connect terminals Tc and CG of DLC3.
SST 09843-18040
Read the DTC on the CRUISE MAIN indicator light.

Fig 6: Identifying DLC3 Terminals TC & CG

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HINT:

If the DTC is not output, inspect the diagnosis circuit.
As an example, the blinking patterns of normal code and code 52 are shown in the illustration

Fig 7: Identifying Blinking Patterns Of Normal Code

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:

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

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

Fig 8: Connecting Hand-Held Tester To DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC CLEARANCE
1. The following actions will erase the DTCs and freeze frame data.
  1. Operating the hand-held tester (See the instruction book for operating instructions.).
  2. Disconnecting the battery terminals or EFI fuse.
2. After completing repairs, the DTC retained in memory can be cleared by removing the EFI fuse for 10 seconds or more with the ignition switch off.
3. Check that the normal code is displayed after connecting the fuse.

DATA LIST

HINT:

According to the DATA LIST displayed on the hand-held tester, you can read the value of the switch, sensor, actuator and soon 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 tester, read the "DATA LIST".

DATA LIST

Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
VEHICLE SPD	Vehicle speed/ min.: 0 km/h (0 mph)max.: 255 km/h (158 mph)	Actual vehicle speed	-
MEMORY SPD	Stored vehicle speed/ min.: 0 km/h (0 mph)max.: 255 km/h (158 mph)	Actual stored vehicle speed	-
THROTTLE	Throttle operating angle/ min.: 0° max.: 125°	Actual required throttle opening	-
CRUISE CONTROL	Cruise control	ON: Cruise control is SET OFF: Cruise control is UNSET	-
MAIN SW (MAIN)	Main switch (Main CPU)	ON: Main switch (Main CPU) is SET OFF: Main switch (Main CPU) is UNSET	-
MAIN SW (SUB)	Main switch (Sub CPU)	ON: Main switch (Sub CPU) is SET OFF: Main switch (Sub CPU) is UNSET	-
CCS READY M	Switch ready (Main CPU)	ON: Switch ready (Main CPU) is SET OFF: Switch ready (Main CPU) is UNSET	-
CCS READY S	Switch ready (Sub CPU)	ON: Switch ready (Sub CPU) is SET OFF: Switch ready (Sub CPU) is UNSET	-
CCS INDICATOR M	Switch indicator (Main CPU)	ON: Switch indicator (Main CPU) is ON OFF: Switch indicator (Main CPU) is OFF	-
CCS INDICATOR S	Switch indicator (Sub CPU)	ON: Switch indicator (Sub CPU) is ON OFF: Switch indicator (Sub CPU) is OFF	-
CANCEL SW	CANCEL switch	ON: CANCEL switch is SET OFF: CANCEL switch is UNSET	-
SET/COAST SW	-/SET switch	ON: -/SET switch is SET OFF: -/SET switch is UNSET	-
RES/ACC SW	+/RES switch	ON:+/RES switch is SET OFF: +/RES switch is UNSET	-
STP LIGHT SW2-M	Stop light SW signal (Main CPU)	ON: Brake pedal depressed OFF: Brake pedal released	-
STP LIGHT SW2-S	Stop light SW signal (Sub CPU)	ON: Brake pedal depressed OFF: Brake pedal released	-
STP LIGHT SW1-M	Stop light SW signal (Sub CPU)	ON: Brake pedal depressed OFF: Brake pedal released	-
SHIFT D POS	Shift D position	ON: Shift is D position OFF: Shift is except D position	-

PROBLEM SYMPTOM CONFIRMATION (ROAD TEST)
1. 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.
  4. After releasing the switch, check that the vehicle cruises at the desired speed.
  Fig 9: Inspecting SET Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the `+' 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 increases while the control switch is pulled up to +/RES, and that the vehicle cruises at the set speed when the switch is released.
  4. Momentarily pull up the control switch upward to the +/RES and then immediately release it. Check that the vehicle speed increases by about 1.5 km/h (Tap-up function).
  Fig 10: Inspecting '+' Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect the `-' 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 decreases while the control switch is push down to -/SET, and the vehicle cruises at the set speed when the switch is released.
  4. Momentarily push the control switch downward to -/SET, and then immediately release it. Check that the vehicle speed decreases by about 1.5 km/h (Tap-down function).
  Fig 11: Inspecting '-' Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Inspect the CANCEL switch.
  1. Push the main button to ON.
  2. Drive at a desired speed [40 km/h (25 mph) or higher].
    
    Fig 12: Inspecting CANCEL Switch
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 any positions except D position
    - Push the main switch button to OFF
    - Pull the cruise control switch to CANCEL
5. Inspect the RES (RESUME) 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
    - Shift to any positions except D position
    - Press the main switch button to OFF
    Fig 13: Inspecting RES (RESUME) Switch
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. After the control switch is pulled up to +/RES at the driving speed of more than 40 km/h (25 mph), check that the vehicle restores the speed before the cancellation.
INPUT SIGNAL CHECK
HINT:
- For check No. 1 - No. 3
  Turn the ignition switch to ON.
- For check No. 4
Jack up the vehicle.

Start the engine

Shift to D position
1. Check the input signal
  1. Keep the main switch to -/SET or +/RES position and hold it down or hold it up.
  2. Press the switch button to ON.
  3. Check that the CRUISE main indicator light blinks twice or 3 times repeatedly after 3 seconds.
  4. Turn the -/SET or +/RES switch to 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 button to OFF.
    
    Fig 14: Checking Input Signal
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    HINT:
    
    When 2 or more signals are input to the ECM, the lowest numbered code will be displayed first.
    
    Fig 15: Identifying Blinking Pattern Of CRUISE Main Indicator Light
    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, +/RES).
Fig 16: Checking Input Signal
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