Engine: Service Precautions

Precautions for Engine

General Precautions

Refer to General Precautions General Precautions.

Precautions for Servicing 4WD Model

Refer to Precautions for Servicing 4WD Model Precautions for Servicing 4WD Model.

Precautions for Catalytic Converter

Refer to Service Precautions Precautions for Catalytic Converter.

Precautions for CAN Communication System

Refer to Precautions for CAN Communication System Precautions for CAN Communication System.

Precautions for Electrical Circuit Service

Refer to Precautions for Electrical Circuit Service Precautions for Electrical Circuit Service.

Air Bag Warning

Refer to Air Bag Warning Air Bag Warning.

Fastener Caution

Refer to Fastener Caution Fastener Caution.

Reassembling Note for Wiring Harness

Be sure to observe Reassembling Note for Wiring Harness Reassembling Note for Wiring Harness
whenever installing wiring harness.

Otherwise, electrical trouble may occur.

Precautions for Engine Service

NOTE:

- If a jack is applied to the oil pan when raising or supporting the engine, the oil pan could be deformed or broken.
Always use a chain hoist to support the engine by attaching the chain to the hooks on the engine.
- If the 12 V electrical system is shorted while servicing the engine, the engine electrical circuits could be damaged seriously.
When the intended service operation does not require electric power supply from the battery, be sure to disconnect the negative cable at the battery before starting the service work.
- If foreign material has entered the engine during removal of intake system components, internal parts of the engine could be severely damaged when the engine is started.
Be sure to suitably cover the air intake port when the air cleaner, throttle body, intake manifold or other intake system component is removed.

Precautions for Diagnosing Trouble

- Do not disconnect ECM connectors from ECM, battery cable from battery, ECM ground wire harness from engine, "B/U" fuse or "DOME" fuse before confirming diagnostic information (pending DTC, confirmed DTC, freeze frame data, etc.) other than permanent DTC stored in ECM memory. Such disconnection will erase memorized information in ECM memory.
- Before using scan tool, read its "Operator's (Instruction) Manual" to know how to use it.
- Priorities for diagnosing troubles
If two or more diagnostic trouble codes (DTCs) are stored, proceed to the flow of the DTC which has detected earliest in the order and follow the instruction in that table.
If no instructions are given, troubleshoot DTCs according to the following priorities.

a DTCs other than DTC P0171 / P0172 (Fuel system too lean / too rich) and DTC P0300 / P0301 / P0302 / P0303 / P0304 (Misfire detected)
b DTC P0171 / P0172 (Fuel system too lean/too rich)
c DTC P0300 / P0301 / P0302 / P0303 / P0304 (Misfire detected)

- Upon completion of inspection and repair work, perform "DTC Confirmation Procedure" and confirm that the trouble has been repaired.
- Be sure to clear all DTCs after completing troubleshooting.

Precautions for Replacing ECM

- ECM must be replace with new one.
- When ECM is replaced with new one, check the following conditions. Neglecting this check may cause damage to ECM.

- Resistance value of all relays, actuators are as specified respectively.
- APP sensor, TP sensor, A/C refrigerant pressure sensor and EVAP leak check pressure sensor are in good condition and none of power circuits of these sensors is shorted to ground.

Precautions for ECM Circuit Inspection

When measuring circuit voltage and/or pulse signal at ECM connector, connect special tool to ECM and ECM connectors referring to Pinout Values and Diagnostic Parameters Inspection of ECM and Its Circuits
and noting the following points.

- ECM connectors are waterproofed. Each terminal of ECM connectors is sealed with grommet.
Therefore, do not insert the tester probe into sealed terminal from harness side. When measuring circuit voltage and/or pulse signal at ECM connector, be sure to connect special tool to ECM connectors and insert tester probe into special tool's connectors at harness side. Otherwise, ECM and its circuits may be damaged by water.
- Wire colors of special tool connectors are different from wire colors of ECM connectors.
However, terminal arrangement of special tool connectors are the same as terminal arrangement of ECM connectors. Therefore, be sure to identify terminal location to measure proper terminal.