Precaution In Diagnosing Trouble

- Don't disconnect couplers from TCM and/or ECM, battery cable from battery, TCM and/or ECM ground wire harness from engine or main fuse before checking the diagnosis information (DTC, freeze frame data, etc.) stored in TCM and/or ECM memory. Such disconnection will clear memorized information in TCM and/or ECM memory.

- Using SUZUKI scan tool (Tech-1) or OBD-II generic scan tool, the A/T diagnostic information stored in ECM memory can be checked and cleared as well. Before its use, be sure to read Operator's (Instruction) Manual supplied with it carefully to have good understanding of its functions and usage.

- DTC stored in TCM can not be cleared with SUZUKI scan tool (with ECM cartridge) or OBD-II generic scan tool. Be sure to follow DTC clearance procedure in this database when clearing it.

- Priorities for diagnosing troubles
If troubleshooting priorities for multiple diagnostic codes are given in the applicable DTC flow chart, these should be followed.
If no instructions are given, troubleshoot diagnostic trouble codes according to the following priorities.
1. Diagnostic Trouble Codes (DTCs) other than DTC P0171 /P0172 (Fuel system too lean/too rich), DTC P0300/P0301/ P0302/ P0303/ P0304 (Misfire detected) and DTC P0400 (EGR flow malfunction).
2. DTC P0171/P0172 (Fuel system too lean/too rich) and DTC P0400 (EGR flow malfunction)
3. DTC P0300/P0301/P0302/P0303/P0304 (Misfire detected)

- Be sure to read "Precautions for Electrical Circuit Service" before inspection and observe what is written there.

- TCM and/or ECM replacement
When substituting a known-good TCM and/or ECM, check for following conditions.
Neglecting this check may result in damage to a good TCM and/or ECM.
- All relays and actuators have resistance of specified value.
- MAP sensor, TP sensor and fuel tank pressure sensor (if equipped) are in good condition. Also, the power circuit of these sensors is not shorted to the ground.