Precautions In Diagnosing Trouble

Precautions 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 the 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 by using ECM application of SUZUKI scan tool in mass storage cartridge. Be sure to follow" DTC Clearance:" when cleaning it.
^ Priorities for diagnosing troubles
If two or more diagnostic trouble codes (DTCs) are stored, proceed to flow table (chart) of DTC, which was detected earliest in order and follow instruction in that table (chart). 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/Rich (Bank-1):", "DTC P0300/P0301/P0302/P0303/P0304: Random/Cylinder 1/Cylinder 2/Cylinder 3/Cylinder 4 Misfire Detected:", "DTC P0401/P0402: Exhaust Gas Recirculation (EGR) Flow Insufficient/Excessive Detected:" and" DTC P0403: Exhaust Gas Recirculation (EGR) Control Circuit:"
2. DTC P0171/P0172 (Fuel system too lean/too rich) and DTC P0401/P0402/P0403 (EGR flow malfunction)
3. "DTC P0300/P0301/P0302/P0303/P0304: Random/Cylinder 1/Cylinder 2/Cylinder 3/Cylinder 4 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 good TCM and/or ECM.
- All relays and actuators have resistance of specified value.
- MAP sensor and TP sensor are in good condition. Also, the power circuit of these sensors is not shorted to the ground.