Precaution In Diagnosing Trouble

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

- Using SUZUKI scan tool (Tech-1) or OBD-II generic scan tool, the diagnostic information stored in PCM 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.

- 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/ P03031 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)

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