Suzuki WagonR+ RB310, Руководство по обслуживанию

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6-10 ENGINE DIAGNOSIS
PRECAUTION IN DIAGNOSING TROUBLE
!
Don ’ t disconnect couplers from ECM, battery cable from battery,
ECM ground wire harness from engine or main fuse before con-
firming diagnostic information (DTC, freeze frame data, etc.)
stored in ECM memory. Such disconnection will erase memo-
rized information in ECM memory.
!
Diagnostic information stored in ECM memory can be cleared as
well as checked by using SUZUKI scan tool (Tech-1) 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 EGR valve).
If troubleshooting priorities for multiple diagnostic codes are giv-
en in the applicable DTC flow chart, these should be followed.
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/too rich), DTC
P0300/P0301/P0302/P0303/P0304 (Misfire detected) and
DTC P0400 (EGR flow malfunction)
2. DTC P0171/P0172 (Fuel system too lean/too rich) and DTC
P0400 (EGR flow malfunction)
3. DTC P0300/P0301/P0302/P0303/P0304 (Misfire detected)
!
Be sure to read “ Precautions for Electrical Circuit Service ” in Sec-
tion 0A before inspection and observe what is written there.
!
ECM Replacement
When substituting a known-good ECM, check for following condi-
tions. Neglecting this check may cause damage to a known-good
ECM.
– Resistance value of all relays, actuators is as specified respec-
tively.
– MAP sensor and TP sensor are in good condition and none of
power circuits of these sensors is shorted to ground.