Suzuki GRAND VITARA XL-7, Service Manual

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ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM) 6-21
Condition Possible Cause Reference Item
Improper engine
idling or engine fails
to idle Intake system out of order.
D
Clogged air cleaner element
D
EGR throttle valve
Fuel system out of order.
D
Shortage of fuel in fuel tank
D
Fuel filter
– Dirty or clogged
– Water mixed in
D
Dirty or clogged fuel hose or pipe
D
Fuel injection pipe
– Cracks
– Fuel leakage from joints
D
Clogged fuel injector
Faulty fuel pump
Engine overheating.
Engine and emission control system
out of order.
D
Faulty ECM
D
Faulty mass air flow sensor
D
Faulty fuel injector
D
Faulty fuel injection pump
– Faulty injection pump solenoid valve
– (3rd piston deactivator)
– Air mixed in
– Pump internal damage
– Faulty fuel pressure regulator
– Faulty fuel pressure sensor
– Faulty TP sensor (accelerator stroke
– sensor)
D
Faulty VSS
D
Faulty CKP sensor
D
Faulty ECT sensor
Glow system out of order.
D
Faulty glow plug
D
Faulty pre post heating relay
EGR system out of order.
D
Faulty EGR solenoid valve
D
Faulty EGR valve
Low compression.
Others
D
Faulty A / T shift switch
D
Faulty A / C signal
D
Mal-adjusted accelerator cable
Clean or replace.
Inspect and replace.
Refill.
Replace.
Repair.
Clean.
Replace.
Repair.
Replace.
Inspect and replace.
Refer to “Overheating” section.
Replace.
Inspect and replace.
Inspect and replace.
Inspect and replace.
Refill fuel in fuel tank.
Replace.
Inspect and replace.
Inspect and replace.
Inspect and replace.
Inspect and replace.
Inspect and replace.
Inspect and replace.
Inspect and replace.
Inspect and replace.
Inspect and repair or replace EGR
system.
Inspect and repair or replace EGR
system.
Previously outlined.
Inspect and replace.
Inspect and replace.
Adjust.