Toyota 4A-FE Repair Manual page 90

EFI SYSTEM - Troubleshooting
Fl-19
SYMPTOM - ROUGH IDLING AND/OR MISSING
CHECK DIAGNOSIS SYSTEM
-
Diagnostic code(s)
Check for output of diagnostic code. Malfunction 4A-FE (See page Fl-28)
(See page Fl-25} code(s)
!
Normal code
CHECK FOR VACUUM LEAKS IN AIR 1. Oil dipstick
-
INTAKE LINE BAD 2. Hose connection(s)
3. PCV hose(s)
4. EGR system - EGR valve stays open
!
OK
CHECK AIR FILTER ELEMENT
Element - Clean or replace
!
OK
BAD
CHECK IDLE SPEED (AND IDLE CO
:
Idle speed - Adjust
CONCENTRATION) NO
4A-FE (See pages EM-22, 23)
Standard: 800 rpm
4A-GE (See pages EM-30, 31)
!
OK
CHECK IGNITION TIMING
- -
Ignition timing - Adjust
1. Connect terminals TE1 and E1 of the NO 4A-FE (See page EM-20)
check connector 4A-GE (See page EM-28)
2. Check ignition timing.
Standard: 10° BTDC
@
idle
l
OK
CHECK SPARK PLUGS
-
1. Spark plugs
Standard:
0.8 mm (0.031 in.) NO 2. Compression pressure
HINT; Check compression pressure and Minimum: 10.0 kg/cm 2
valve clearance if necessary.
(142 psi, 981 kPa)
at 250 rpm
3. Valve clearance (Cold)
Standard:
IN 0.15 - 0.25 mm
(0.006 - 0.010 in.)
EX 0.20 - 0.30 mm
(0.008 - 0.012 in.)
i
OK
CHECK COLD START- INJECTOR 1. Cold start .injector
-
(See page Fl-105) BAD 2. Start injector time switch
(See page Fl-137)
!
OK
CHECK FUEL PRESSURE
-
1 . Fuel pump (See page Fl-94)
(See page Fl-97) BAD
2. Fuel filter
3. Fuel pressure regulator (See page Fl-109)
l
OK
CONTINUED ON PAGE Fl-20