Suzuki GRAND VITARA XL-7 Owner's Manual page 193

6-1-32 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE)
Condition
Improper engine idling
or engine fails to idle
Engine hesitates
(Momentary lack of
response as the accel-
erator is depressed.
Can occur at all vehi-
cle speeds.
Usually most severe
when first trying to
make the vehicle
move, as from a stop
sign.)
Possible Cause
Faulty spark plug
Faulty ignition coil with ignitor
Fuel pressure out of specification
Engine overheating
Maladjusted TP sensor installation angle if
adjustable
Faulty idle air control system
Faulty FIA (fast idle air) valve
Faulty evaporative emission control system
Faulty EGR system
Faulty injector
Faulty ECT sensor, TP sensor or MAF sensor
Faulty ECM (PCM)
Low compression
Malfunctioning PCV valve
Spark plug faulty or plug gap as out of adjust-
ment
Fuel pressure out of specification
(clogged fuel filter, faulty fuel pressure regula-
tor, clogged fuel filter, hose or pipe)
Engine overheating
Faulty EGR system
Faulty injector
Faulty TP sensor, ECT sensor or MAF sensor
Faulty ECM (PCM)
Low compression
Correction
Spark plugs in Section 6F2.
Ignition coil in Section 6F2.
"DIAG. FLOW TABLE B-3" in this
section.
Refer to "OVERHEATING" in this
table.
TP sensor in Section 6E2.
"DIAG. FLOW TABLE B-4" in this
section.
FIA valve in Section 6E2.
EVAP control system in Section
6E2.
"DTC P0400 DIAG. FLOW TABLE"
in this section.
Fuel injection in Section 6E2.
ECT sensor, TP sensor or MAF
sensor in Section 6E2.
Inspection of ECM (PCM) and its
circuit in this section.
Refer to the same item in "HARD
STARTING" of this table.
PCV system inspection in Section
6E2.
Spark plugs in Section 6F2.
"DIAG. FLOW TABLE B-3" in this
section.
Refer to "OVERHEATING" in this
table.
"DTC P0400 DIAG. FLOW TABLE"
in this section.
Fuel injector in Section 6E2.
TP sensor, ECT sensor or MAF
sensor in Section 6E2.
Inspection of ECM (PCM) and its
circuit in this section.
Refer to the same item in "HARD
STARTING" of this table.