Precheck

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 (See page BE-2 ) for the combination meter section.

Indicator Light

BE4034

DLC1

w

0

/

—-

J

/

4

(

1 )

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 of DTC using diagnosis check wire.

(1) Turn the ignition switch ON.

(2) Using SST, connect terminals Tc and E1 of DLC1. SST 09843-18020

(3) Read the DTC on the CRUISE MAIN indicator light.

Normal Code

Malfunction codes 11 and 21

BE4032 BE4033

Code 11

Code 21

I00021

HINT:

If the DTC is not output, inspect the diagnosis circuit (See page DI-603 ).

As an example, the blinking patterns for codes; normal, 11 and 21 are shown in the illustration.

BE4032 BE4033

I00021

2. DTC CLEARANCE (ERASE MODE)

HINT:

Under the erase mode, diag detection does not work.

(b) Using SST, connect terminals Tc and E1 of DLC1. SST 09843-18020

(c) Pull the cruise control switch to CANCEL.

(d) On the above metioned condition, turn on the cruise control main switch 5 times within 3 seconds.

3. 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) Pull 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 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 pull the control switch upward to 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 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 pull the control switch downward 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 Depress the clutch pedal (M/T) Shift to except D position (A/T) 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 Depress the clutch pedal (M/T) Shift to except D position (A/T) 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.

4. INPUT SIGNAL CHECK

HINT:

• Turn ignition switch ON.

(a) Pull the control switch to SET/COAST or RES/ACC position and hold it down or hold it up "(1)".

(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.

No.

Operation Method

CRUISE MAIN Indicator LIght Blinking Pattern

Diagnosis

1

Turn SET/COAST switch ON

Li9hC

SET/COAST switch circuit is normal

2

Turn RES/ACC switch ON

RES/ACC switch circuit is normal

3

Turn CANCEL switch ON

ON Switch OFF LightON

OFF

Switch ON

CANCEL switch circuit is normal

Turn stop light switch ON Depress brake pedal

Stop light switch circuit is normal

Turn PNP switch OFF (Shift to except D position)

ON Switch ON

Light

OFF

Switch OFF

PNP switch circuit is normal

Turn clutch switch OFF (Depress clutch pedal)

Clutch switch circuit is normal

4

Drive at about 40 km/h (25 mph)or higher

Vehicle Speed Sensor is normal

Drive at about 40 km/h (25 mph) or below

Light ;

OFF L

DIAGNOSTICS - AUTOMATIC TRANSAXLE_

DI0CF-06

PRE-CHECK

1. DIAGNOSIS SYSTEM

(a) Description

• When troubleshooting OBD II vehicles, the only difference from the usual troubleshooting procedure is that you connect to the vehicle an OBD II scan tool complying with SAE J1987 or TOYOTA handheld tester, and read off various data output from the vehicle's ECM.

OBD II regulations require that the vehicle's onboard computer lights up the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in the computer itself or in drive system components which affect vehicle emissions. In addition to the MIL lighting up when a malfunction is detected, the applicable DTCs prescribed by SAE J2012 are recorded in the ECM memory (See page DI-13 ). If the malfunction only occurs in 3-trip, the MIL goes off but the DTCs remain recorded in the ECM memory.

CHECK

FI0534

To check the DTCs, connect an OBD II scan tool or TOYOTA hand-held tester to DLC3 on the vehicle. The OBD II scan tool or TOYOTA hand-held tester also enables you to erase the DTCs and check freeze frame data and various forms of engine data (For instruction book).

DTCs include SAE controlled codes and Manufacturer controlled codes.

SAE controlled codes must be set as prescribed by the SAE, while Manufacturer controlled codes can be set freely by the manufacturer within the prescribed limits (See DTC chart on page DI-168 ).

• The diagnosis system operates in normal mode during normal vehicle use, and also has a check mode for technicians to simulate malfunction symptoms and perform troubleshooting. Most DTCs use 2-trip detection logic(*) to prevent erroneous detection. By switching the ECM to check mode when troubleshooting, the technician can cause the MIL to light up and for a malfunction that is only detected once or momentarily (TOYOTA hand-held tester) (See page DI-157).

When a logic malfunction is first detected, the malfunction is temporarily stored in the ECM memory. If the same malfunction is detected again during the 2nd test drive, this 2nd detection causes the MIL to light up.

N09214

(b) Inspect 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.

N09214

Terminal No.

Connection/ Voltage or Resistance

Condition

7

Bus © Line/ Pulse generation

During communication

4

Chassis Ground ^ Body/ 1 Q or less

Always

5

Signal Ground ^ Body/ 1 Q or less

Always

16

Battery Positive ^ Body/ 9 - 14 V

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

• 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.

2. INSPECT DIAGNOSIS (NORMAL MODE)

(1) The MIL comes on when the ignition switch is turned ON and the engine is not running.

HINT:

If the MIL does not light up, troubleshoot the combination meter (See page BE-2).

(2) When the engine is started, the MIL should go off. If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system.

TOYOTA hand-held tester only: When the diagnostic system is switched from normal mode to check mode, it erases all DTCs and freeze frame data recorded in normal mode. So before switching modes, always check the DTCs and freeze frame data, and note them down.

Prepare an OBD II scan tool (complying with SAE J1978) or TOYOTA hand-held tester. Connect the OBD II scan tool or TOYOTA handheld tester to DLC3 at the lower of the instrument panel.

Turn the ignition switch ON and turn the OBD II scan tool or TOYOTA hand-held tester switch ON. Use the OBD II scan tool or TOYOTA hand-held tester to check the DTCs and freeze frame data and note them down (For operating instructions, see the OBD II scan tool's instruction book). See page DI-168 to confirm the details of the DTCs.

When simulating symptoms with an OBD II scan tool (excluding TOYOTA hand-held tester) to check the DTCs, use normal mode. For codes on the DTCs chart subject to "2-trip detection logic", turn the ignition switch OFF after the symptoms have been simulated the 1st time. Then repeat the simulation process again. When the program has DTCs they are recorded in the ECM.

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