Precautions in Diagnosing Trouble
WARNING: This page is about a different car, the 2004 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.
Refer to "Precautions in Diagnosing Trouble ".
- Don't disconnect couplers from ECM (PCM), battery cable from battery, ECM (PCM) ground wire harness from engine or main fuse before confirming diagnostic information (DTC, freeze frame data, etc.) stored in ECM (PCM) memory. Such disconnection will erase memorized information in ECM (PCM) memory.
- Diagnostic information stored in ECM (PCM) memory can be cleared as well as checked by using SUZUKI scan tool 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 two or more DTCs are stored, proceed to the flow of the DTC which was detected earliest in the order and follow the instruction in that flow.
If no instructions are given, troubleshoot DTCs according to the following priorities.
- DTCs other than DTC P0171 / P0172 / P0174 / P0175 (Fuel system too lean / too rich), DTC P0300 / P0301 / P0302 / P0303 / P0304 / P0305 / P0306 (Misfire detected) and DTC P0401 / P0402 (EGR flow malfunction)
- DTC P0171 / P0172 / P0174 / P0175 (Fuel system too lean / too rich) and DTC P0401 / P0402 (EGR flow malfunction)
- DTC P0300 / P0301 / P0302 / P0303 / P0304 / P0305 / P0306 (Misfire detected)
- ECM (PCM) replacement
When substituting a known-good ECM (PCM), check for the following conditions. Neglecting this check may cause damage to a known-good ECM (PCM).
- Resistance value of all relays, actuators is as specified respectively.
- MAF sensor, 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.