Suzuki Jimny Service Manual page 381

6-24 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Condition
Engine has no power
Improper engine idling
or engine fails to idle
Engine hesitates
(Momentary lack of
response as the accel-
erator is depressed.
Can occur at all vehicle
speeds.
Usually most severe
when first trying to
make the vehicle move,
as from a stop sign.)
Surges
(Engine power variation
under steady throttle or
cruise.
Feels like the vehicle
speeds up and down
with no change in the
accelerator pedal.)
Possible Cause
Engine overheating
• Faulty ignition coil
• Faulty knock sensor
• Fuel pressure out of specification
• Faulty injector
• Faulty TP sensor, ECT sensor or MAP
sensor
• Faulty ECM
• Malfunctioning EGR valve (if equipped)
• Maladjusted accelerator cable play
Low compression
• Dragging brakes
• Slipping clutch
• Faulty ignition coil
Engine overheating
• Fuel pressure out of specification
• Faulty idle air control system
• Faulty evaporative emission control sys-
tem
• Faulty injector
• Faulty ECT sensor, TP sensor or MAP
sensor
• Malfunctioning PCV system
• Faulty ECM
• Faulty EGR system (if equipped)
Low compression
• Faulty ignition coil
Engine overheating
• Fuel pressure out of specification
• Faulty injector
• Faulty TP sensor, ECT sensor or MAP
sensor
• Faulty ECM
• Malfunctioning EGR valve (if equipped)
Low compression
• Faulty ignition coil or high-tension cord
• Variable fuel pressure
• Faulty MAP sensor
• Faulty injector
• Faulty ECM
• Malfunctioning EGR valve (if equipped)
Reference Item
Refer to "Overheating" of this table.
Ignition coil assembly in Section 6F.
Knock sensor malfunction in this sec-
tion.
Diagnostic Flow Table B-3
Diagnostic Flow Table B-1
TP sensor, ECT sensor or MAP sen-
sor in Section 6E.
Inspection of ECM and its circuit in
this section.
EGR system in Section 6E.
Accelerator cable adjustment in Sec-
tion 6E.
Previously outlined.
Diagnosis table in Section 5.
Diagnosis table in Section 7C.
Ignition coil assembly in Section 6F.
Refer to "Overheating" of this table.
Diagnostic Flow Table B-3
Diagnostic Flow Table B-4
EVAP control system in Section 6E.
Diagnostic Flow Table B-1
ECT sensor, TP sensor or MAP sen-
sor in Section 6E.
PCV system in Section 6F.
Inspection of ECM and its circuit in
this section.
EGR system in Section 6E.
Previously outlined.
Ignition coil assembly in Section 6F.
Refer to "Overheating" of this table.
Diagnostic Flow Table B-3
Diagnostic Flow Table B-1
TP sensor, ECT sensor or MAP sen-
sor in Section 6E.
Inspection of ECM and its circuit in
this section.
EGR system in Section 6E.
Previously outlined.
Ignition coil assembly or high-tension
cords in Section 6F.
Diagnostic Flow Table B-3
MAP sensor in Section 6E.
Diagnostic Flow Table B-1
Inspection of ECM and its circuit in
this section.
EGR system in Section 6E.