Suzuki Liana RH418, Supplementary Service Manual

Page: 58 / 371

1A-45 Engine General Information and Diagnosis:
DTC Confirmation Procedure
1) Clear DTC. Refer to “DTC Clearance”.
2) Start engine and drive vehicle under usual driving condition for 5 minutes or longer until engine is warmed up to
normal operating temperature.
3) Stop vehicle.
4) Run engine at idle speed for 1 minute.
5) Start vehicle and increase vehicle speed up to 80 km/h (50 mile/h).
6) Keep vehicle speed at 80 km/h (50 mile/h) for 1 minute or longer at 5th gear position or D range.
7) Decrease vehicle speed gradually.
8) Stop vehicle.
Check DTC. Refer to “DTC Check” in this section.
Troubleshooting
Step Action Yes No
1 Is DTC P1915 detected together? Go to “DTC P1915 (No.
33): Oil Control Valve
Circuit” in this section. Go to Step 2.
2 Do you have SUZUKI scan tool? Go to Step 3. Go to Step 5.
3 Camshaft position control (VVT GAP TARGET-ACTUAL
POSITION) check
1) With ignition switch turned OFF, connect SUZUKI scan
tool to DLC.
2) Start engine and warm up to normal operating
temperature.
3) Select menu to DATA LIST.
4) Check that the VVT GAP displayed on SUZUKI scan tool
is 0 – 5
°
.
Is it OK?
Go to Step 4. Check valve timing
referring to “Timing
Chain and Chain
Tensioner Removal and
Installation in Section
1D”.
If OK, go to Step 5.
4 Camshaft position control signal check
1) Drive vehicle the following condition.
• Vehicle speed at 80 km/h (50 mile/h).
• Gear position at 5th or D range.
2) Check that the VVT GAP displayed on SUZUKI scan tool
is 0 – 5
°
.
Is it OK?
Substitute a known-
good ECM and recheck. Go to Step 5.
5 Oil control circuit visual inspection
1) Remove cylinder head cover referring to “Cylinder Head
Cover Removal and Installation in Section 1D”.
2) Check oil pressure leakage from oil control circuit.
Is it in good condition?
Go to Step 6. Repair or replace.
6 Check oil control circuit
1) Remove oil control valve referring to “Oil Control Valve
Removal and Installation in Section 1C”.
2) Remove oil gallery pipe referring to “Timing Chain Cover
Cleaning and Inspection in Section 1D”.
3) Check oil gallery pipe and oil control valve for clog or
sludge.
Is it in good condition?
Go to Step 7. Clean oil control valve
and oil gallery pipe.
Replace oil control valve
if a problem is not
solved after cleaning oil
control valve and oil
gallery pipe.