10C
Precautions in Diagnosing Troubles
ECM
Vehicle not equipped with immobilizer indicator lamp
• Before identifying DTC indicated by malfunction indicator lamp or SUZUKI scan tool, don’t disconnect couplers from ECM, battery cable from battery, ECM ground wire harness from engine.
Such disconnection will clear trouble codes for engine and emission control system and immobilizer control system stored in memory of ECM.
• If abnormality or malfunction lies in two or more areas, malfunction indicator lamp indicates applicable codes
three times each.
And flashing of these codes is repeated as long as diagnosis terminal is grounded and ignition switch is held at ON position.
• When ECM detects a trouble in both engine and emission control system and immobilizer control system, malfunction indicator lamp indicates trouble codes of both systems alternately while the ignition switch is turned ON and the diagnosis terminal is grounded.
• Take a note of DTC indicated first.
Vehicle equipped with immobilizer indicator lamp
• Before identifying DTC indicated through SUZUKI scan tool, don’t disconnect couplers from ECM, battery cable from battery, ECM ground wire harness from engine. Such disconnection will clear DTCs for engine and emission control system and immobilizer control system stored in memory of ECM.
• Take a note of DTC indicated first.
Immobilizer Control Module
• Take a note of DTC indicated first.
Intermittent Troubles
• There are cases where output of diagnostic output terminal, malfunction indicator lamp and/or SUZUKI scan tool indicate a DTC representing a trouble which occurred only temporarily and has gone. In such case, it may occur that good parts are replaced unnecessarily. To prevent such accident, be sure to follow instructions given below when checking by using “Diagnostic Flow Table”.
— When trouble can be identified, it is not an intermittent one:
Check coil antenna, ignition key, wires and each connection. If they are all in good condition, substitute a known-good ECM and recheck.
— When trouble can not be identified but output of diagnostic output terminal, malfunction indicator lamp and/or SUZUKI scan tool indicate a DTC:
Diagnose trouble by using that code No. If ignition key, coil antenna, wires and each connection are all in good condition, turn OFF ignition switch and then ON.
• Then check what malfunction indicator lamp, output of diagnostic output terminal and/or SUZUKI scan tool indicate.
• Only when they indicate trouble code again, substitute a known-good ECM or immobilizer Control Module and check again.
• If they indicate not trouble code but normal code, it means that an intermittent trouble did occur and has gone. In this case, check wires and connections carefully again.