Suzuki Jimny Service Manual page 431

6-74 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Step
3 Check Ignition System.
1) Remove spark plugs and check them for;
• Air gap : 1.0 – 1.1 mm (0.040 – 0.043 in.) See Fig. 1.
• Carbon deposits / Insulator damage / Plug type
If abnormality is found, adjust, clean or replace by
referring to Section 6F. (See CAUTION)
2) Disconnect all injector connectors. 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?
4 Check Fuel Pressure (Refer to Section 6E for details).
1) Release fuel pressure from fuel feed line.
2) Install fuel pressure gauge. See Fig. 3.
3) Check fuel pressure.
Fuel pressure specification
With fuel pump operating and engine at stop :
270 – 310 kPa, 2.7 – 3.1 kg/cm
At specified idle speed :
210 – 260 kPa, 2.1 – 2.6 kg/cm
Is measured value as specified?
5 Check Fuel Injectors and Circuit.
1) sing sound scope (1) or such, check operating sound
of each injector (2) when engine is running. Cycle of
operating sound should very according to engine
speed. See Fig 4.
If no sound or an unusual sound is heard, check
injector circuit (wire or coupler) or injector.
2) Turn ignition switch OFF and disconnect a fuel injec-
tor connector.
3) Check for proper connection to fuel injector at each
terminal.
4) If OK, then check injector resistance. See Fig. 5.
Injector resistance
11.3 – 13.8 ohm at 20 °C (68 °F)
5) Carry out steps 1) and 3) on each injector.
6) Check each injector for injected fuel volume referring
to Section 6E. See Fig. 6.
Injected fuel volume
43 – 47 cc/15 sec (1.45/1.51 – 1.58/1.65 US/Imp. oz/
15 sec)
7) Check each injector for fuel leakage after injector
closed.
Fuel leakage
Less than 1 drop/min.
Is check result in step 1) and 3) to 7) satisfactory?
6 Check PCV valve for clogging (See Section 6E).
Is it in good condition?
Action
2
, 38.4 – 44.0 psi.
2
, 29.8 – 37.0 psi.
Yes
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
No
Check ignition sys-
tem parts (Refer to
Section 6F).
Go to Diag. Flow
Table B-3 fuel pres-
sure check.
Check injector cir-
cuit or replace fuel
injector(s).
Replace PCV
valve.