DIAGNOSIS SYSTEM

Troubleshooting

EURO-OBD (EUROPE)

When troubleshooting Europe On-Board Diagnostic (Euro-OBD) vehicles, the vehicle must be connected to an OBD scan tool (complying with ISO 15765-4). Various data output from the vehicle's ECM can then be read.
Euro-OBD regulations require that the vehicle's on-board computer illuminates the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in:

The emission control system/components
The power train control components (which affect vehicle emissions)

The computer
In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by ISO 15765-4 are recorded in the ECM memory. If the malfunction does not reoccur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the ECM memory.
To check DTCs, connect the intelligent tester to the Data Link Connector3 (DLC3) of the vehicle.
The scan tool displays DTCs, the freeze frame data and a variety of the engine data.
The DTCs and freeze frame data can be erased with the scan tool (Click here).

M-OBD (EXCEPT EUROPEAN SPEC.)

When troubleshooting Multiplex On-Board Diagnostic (M-OBD) vehicle, the vehicle must be connected to the intelligent tester. Various data output from the ECM can then be read.
OBD regulations require that the vehicle's on-board computer illuminates the MIL on the instrument panel when the computer detects a malfunction in:

The emission control system/components
The power train control components (which affect vehicle emissions)
The computer
In addition, the applicable DTCs are recorded in the ECM memory. If the malfunction does not recur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the ECM memory.

NORMAL MODE AND CHECK MODE

The diagnosis system operates in "normal mode" during normal vehicle use. In normal mode, "2 trip detection logic" is used to ensure accurate detection of malfunctions. "Check mode" is also available to technicians as an option. In check mode, "1 trip detection logic" is used for simulating malfunction symptoms and increasing the system's ability to detected malfunctions, including intermittent malfunctions (intelligent tester only).

2-TRIP DETECTION LOGIC

When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected again after the engine switch is turned off and then on (IG), the MIL will illuminate.
A122830E11

DLC3 (Data Link Connector 3)

The vehicle's ECM uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 15765-4 format.

HINT:
: Connect the cable of the intelligent tester to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.; If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.; If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.

Symbol	Terminal No.	Name	Reference terminal	Result	Condition
SIL	7	Bus "+" line	5 - Signal ground	Pulse generation	During transmission
CG	4	Chassis ground	Body ground	1Ω or less	Always
SG	5	Signal ground	Body ground	1Ω or less	Always
BAT	16	Battery positive	Body ground	9 to 14 V	Always
CANH	6	High-lever CAN bus line	CANL	54 to 69 Ω	IG switch OFF
CANH	6	High-lever CAN bus line	Body ground	1 MΩ or higher	IG switch OFF
CANH	6	High-lever CAN bus line	CG	1 kΩ or higher	IG switch OFF
CANL	14	Low-lever CAN bus line	Body ground	1 MΩ or higher	IG switch OFF
CANL	14	Low-lever CAN bus line	CG	1 kΩ or higher	IG switch OFF

INSPECT BATTERY VOLTAGE

If voltage is below 11 V, replace the battery before proceeding to the next step.

Standard Voltage:: 11 to 14 V

CHECK MIL

Check that the MIL illuminates when turning the engine switch on (IG).
If the MIL does not illuminate, there is a problem in the MIL circuit (Click here).
When the engine is started, the MIL should turn off.

ALL READINESS

For this vehicle, using the intelligent tester allows readiness codes corresponding to all DTCs read. When diagnosis (normal or malfunctioning) has complete, readiness codes are set.