Powertrain Management: Service Precautions

^ Don't disconnect couplers from ECM, battery cable from battery, ECM ground wire harness from engine or main fuse before confirming diagnostic information (DTC, freeze frame data, etc.) stored in ECM memory. Such disconnection will erase memorized information in ECM memory.

^ Diagnostic information stored in ECM memory can be cleared as well as checked by using SUZUKI scan tool (Tech-1) or OBD-II generic scan tool. Before using scan tool, read its Operator's (Instruction) Manual carefully to have good understanding as to what functions are available and how to use 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)

^ ECM Replacement:
When substituting a known-good ECM, check for following conditions. Neglecting this check may cause damage to a known-good ECM.
- Resistance value of all relays, actuators is as specified respectively.
- MAP sensor, TP sensor and fuel tank pressure sensor are in good condition and none of power circuits of these sensors is shorted to ground.