Suzuki Jimny Service Manual page 367

6-10 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Precaution 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, 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 or 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 (Vehicle with Immobilizer indicator lamp).
If multiple diagnostic trouble codes (DTCs) are stored, proceed to the flow table of the DTC which has
detected earliest in the order and follow the instruction in that table.
If no instructions are given, troubleshoot diagnostic trouble codes according to the following priorities.
– 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)
– DTC P0171/P0172 (Fuel system too lean / too rich) and DTC P0400 (EGR flow malfunction)
– DTC P0300/P0301/P0302/P0303/P0304 (Misfire detected)
• Be sure to read "Precautions for Electrical Circuit Service" in Section 0A before inspection and observe what
is written there.
• 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 and TP sensor are in good condition and none of power circuits of these sensors is shorted
to ground.
AMBIENT TEMPERATURE
Over 0 °C (32 °F)
Under 0 °C (32 °F)
TIME TO CUT POWER TO
ECM
60 sec. or longer
Not specifiable.
Select a place with higher than
0 °C (32 °F) temperature.