6-70 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
INSPECTION
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE
DIAG. FLOW
TABLE“.
2 Is there DTC other than Fuel system (DTC P0171/P0172)
and misfire (DTC P0300-P0303)?
Go to applicable
DTC Diag.
Flow Table.
Go to Step 3.
3 Check Ignition System.
1) Remove spark plugs and check them for;
D Air gap: 1.0 – 1.1 mm (0.040 – 0.043 in.) See Fig. 1.
D Carbon deposits
D Insulator damage
D Plug type
If abnormality is found, adjust, clean or replace.
2) Disconnect injector connector. See Fig. 2.
3) Connect spark plugs to high tension cords and then
ground spark plugs.
4) Crank engine and check that each spark plug sparks.
Are above check results satisfactory?
Go to Step 4. Check ignition
system parts
(Refer to Section
6F).
4 Check Fuel Pressure (Refer to Section 6E1 for details).
1) Release fuel pressure from fuel feed line.
2) Install fuel pressure gauge. See Fig. 3.
3) Check fuel pressure.
With fuel pump operating
and engine at stop : 160 – 210 kPa, 1.6 – 2.1 kg/cm
2
,
22.7 – 29.9 psi.
At specified idle speed : 90 – 140 kPa, 0.9 – 1.4 kg/cm
2
,
12.8 – 20.0 psi.
Is measured value as specified?
Go to Step 5. Go to Diag. Flow
Table B-3 fuel
pressure check.
5 Check Fuel Injector and Circuit.
1) Turn ignition switch OFF and disconnect fuel injector
connector.
2) Check for proper connection to fuel injector at each terminal.
3) If OK, then check injector resistance. See Fig. 4.
Injector resistance: 0.5 – 1.5 Ω at 20_C (68_F).
4) Connect injector connector.
5) Check that fuel is injected out in conical shape from fuel
injector when running engine.
6) Check injector for fuel leakage after engine stop.
Fuel leakage: Less than 1 drop/min.
Is check result satisfactory?
Go to Step 6. Check injector
circuit or replace
fuel injector.
To Next Page
Loading...
Need help?
General
