Suzuki GA413, Service Manual

Page: 301 / 1246

ENGINE 6-9
9. TROUBLESHOOTING FOR DTC
Based on the DTC indicated in Step 6 or 7, locate the cause of the trouble, namely in a sensor, switch, wire
harness, connector, actuator, ECM or other part and repair or replace faulty parts. Refer to the applicable DTC
diag. flow table in Section 6E.
10. CHECK FOR INTERMITTENT PROBLEM
Check parts where an intermittent trouble is easy to occur (e.g., wire harness, connector, etc.). Refer to “IN-
TERMITTENT AND POOR CONNECTION” in Section 0A and related circuit of DTC recorded in Step 2.
11. FINAL CONFIRMATION TEST
Confirm that the problem symptom has gone and the engine is free from any abnormal conditions. If what has
been repaired is related to the DTC, clear the DTC once, perform DTC confirmation procedure in Section 6E
and confirm that no malfunction DTC (a normal code) is indicated.
ENGINE DIAGNOSIS TABLE
Condition Possible Cause Reference Item
Hard starting
(Engine cranks OK)
Engine and emission control system
out of order.
Faulty CMP sensing rotor or CKP sensing
rotor
Faulty idle air control system
Faulty ECT sensor, TP sensor, CKP sensor,
CMP sensor or MAP sensor
Faulty EGR system
Fuel pressure out of specification
Faulty fuel injector
Faulty ECM
Malfunctioning PCV system
Low compression.
Improper valve lash
Improper valve timing
Compression leak from valve seat
Sticky valve stem
Weak or damaged valve springs
Compression leak at cylinder head gasket
Sticking or damaged piston ring
Worn piston, ring or cylinder
Ignition system out of order.
Faulty ignition coil or high-tension cord
CMP sensing rotor or CKP sensing
rotor inspection in Section 6E.
Diag. Flow Table B-4 in Section 6E.
ECT sensor, TP sensor, CKP sensor,
CMP sensor or MAP sensor in Sec-
tion 6E.
Diag. Flow Table B-6 in Section 6E.
Diag. Flow Table B-3 in Section 6E.
Fuel injector injection volume inspec-
tion in Section 6E.
Inspection of ECM and its circuit in
Section 6E.
PCV system inspection in Section 6E.
Compression check in Section 6A.
Valve lash in Section 6A.
Timing belt and belt tensioner in Sec-
tion 6A.
Valves inspection in Section 6A.
Valves inspection in Section 6A.
Valves spring inspection in Section
6A.
Cylinder head inspection in Section
6A.
Piston ring inspection in Section 6A.
Cylinders, pistons and piston rings
inspection in Section 6A.
Diagnosis in Section 6F.