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Step
2
Is there DTC other than Fuel system (DTC P0171/
P0172) and misfire (DTC P0300-P0304)?
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.
2) Disconnect all injector connectors.
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 6E1 for details).
1) Release fuel pressure from fuel feed line.
2) Install fuel pressure gauge. See Fig. 2.
3) Check fuel pressure.
With fuel pump operating and engine at stop : 270 –
310 kPa, 2.7 – 3.1 kg/cm
At specified idle speed : 270 – 310 kPa, 2.7 – 3.1 kg/
2
cm
, 38.4 – 44.0 psi.
Is measured value as specified?
5
Check Fuel Injectors and Circuit.
1) Using 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 3.
If no sound or an unusual sound is heard, check
injector circuit (wire or connector) 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. See Fig. 4.
4) If OK, then check injector resistance.
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 6E1. See Fig. 5.
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 6E1).
Is it in good condition?
Action
2
, 38.4 – 44.0 psi.
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-83
Yes
Go to applicable DTC
Diag. Flow Table.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
No
Go to Step 3.
Check ignition sys-
tem parts (Refer to
Section 6F1)
Go to Diag. Flow
Table B-3 fuel
pressure check.
Check injector cir-
cuit or replace fuel
injector(s).
Replace PCV
valve.
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