Suzuki SY413 Service Manual page 2673

6-1-74 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G13/G16 ENGINE WITH WU TWC)
STEP
6 Check PCV valve for clogging (See Section 6E2).
Is it in good condition?
7 Check EVAP Canister Purge Valve for Closing.
1) Disconnect purge hose (1) from EVAP canister.
2) Place finger against the end of disconnected hose.
3) Check that vacuum is not felt there, when engine is
cool and running at idle. See Fig. 7.
Is vacuum felt?
8 Check intake manifold pressure sensor for performance
(See DTC P0105 Diag. Flow Table).
Is it in good condition?
9 Check engine coolant temp. sensor for performance.
(See Section 6E2).
Is it in good condition?
10 Check parts or system which can cause engine rough idle
or poor performance.
– Engine compression (See Section 6A1).
– Valve lash (See Section 6A1).
– Valve timing (Timing belt installation. See Section 6A1).
Are they in good condition?
Fig.1 for Step 3
Fig.4 for Step 5
Fig.7 for Step 7
ACTION
Fig.2 for Step 3
Disconnect connectors when checking plugs for spark
Fig.5 for Step 5
1. Sound scope
1. Purge hose
YES
Go to Step 7.
Check EVAP control
system.
(See Section 6E2).
Go to Step 9.
Go to Step 10.
Check wire harness
and connection of ECM
(PCM) ground, ignition
system and fuel injec-
tor for intermittent open
and short.
Fig.3 for Step 4
Fig.6 for Step 5
NO
Replace PCV
valve.
Go to Step 8.
Repair or replace.
Replace engine
coolant temp.
sensor.
Repair or replace.
1. Fuel delivery pipe
2. Fuel feed hose
3. Fuel return pipe
4. Fuel pressure gauge
& 3 way joint