Suzuki GA413 Service Manual page 846

6-70 ENGINE GENERAL INFORMATION AND DIAGNOSIS
STEP
6 Check PCV valve for clogging (See Section 6E).
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. 6.
Is vacuum felt?
8 Check manifold absolute pressure sensor for perfor-
mance (See step 4) DTC P0105 Diag. Flow Table).
Is it in good condition?
9 Check engine coolant temp. sensor for performance
(See Section 6E).
Is it in good condition?
10 Check parts or system which can cause engine rough idle
or poor performance.
– Engine compression (See Section 6A).
– Valve lash (See Section 6A).
– Valve timing (Timing belt installation. See Section 6A).
Are they in good condition?
Fig. 1 for Step 3
Fig. 4 for Step 4
ACTION
Fig. 2 for Step 4
1. Fuel feed hose
2. Fuel pressure gauge & 3 way joint
Fig. 5 for Step 5
YES
Go to Step 7. Replace PCV valve.
Check EVAP control Go to Step 8.
system
(See Section 6E).
Go to Step 9. Repair or replace.
Go to Step 10. Replace engine
coolant temp.
sensor.
Check wire harness Repair or replace.
and connection of
ECM ground, ignition
system and fuel in-
jector for intermittent
open and short.
Fig. 3 for Step 5
Fig. 6 for Step 7
NO