6-10
ENGINE
SH410
9. TROUBLESHOOTING FOR DTC
Based on the DTC indicated in Step 6 or 7 and referring to the applicable DTC diag. flow table in Section 6E1,
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.
10. CHECK FOR INTERMITTENT PROBLEM
Check parts where an intermittent trouble is easy to occur (e.g., wire harness, connector, etc.), referring to
“INTERMITTENT 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 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
Faulty idle air control system
Faulty ECT sensor or MAP sensor
Faulty ECM
Low compression.
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
Others
Malfunctioning PCV valve
CMP sensing rotor inspection in sec-
tion 6E1.
Diag. Flow Table B-4 in Section 6E1.
ECT sensor or MAP sensor in Section
6E1.
Inspection of ECM and its circuit in
Section 6E1.
Compression check in Section 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.
PCV system inspection in Section
6E1.