Precautions in Diagnosing Trouble
Don’t disconnect couplers from ECM, battery cable at battery, ECM ground wire harness from engine or main fuse before confirming diagnostic information (DTC 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 or OBD 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.
Be sure to read Precautions for Electrical Circuit Service before inspection and observe what is written there.
ECM replacement:
When substituting a known-good ECM, check for the 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 and TP sensor are in good condition and none of power circuits of these sensors is shorted to ground.
ECM/Immobilizer code registration after replacement ECM:
When ECM is replaced with new one or with other one, make sure that register ECM/immobilizer code to ECM correctly according to Procedure after ECM Replacement:M13A Model .