Toyota 4A-FE Repair Manual page 94

EFI SYSTEM - Troubleshooting Fl-23
~OK
CONTINUED FROM PAGE Fl-22
CHECK IDLE SPEED (AND IDLE CO 1. Idle speed - Adjust
CONCENTRATION)
NO 4A-FE (See pages EM-22, 23)
Standard: 800 rpm
2. Idle CO concentration - Adjust
!
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
-
Fuel pressure regulator
(See page Fl-97)
BAD
~
OK
CHECK THROTTLE POSITION
- - -
· 1
Throttle body
I
SENSOR
BAD
4A-FE (See page Fl-123)
4A-GE (See page Fl-127)
J
OK
CHECK INJECTORS (See page Fl-111)
Injectors - Leakage
~
OK
BAD
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/cm2
valve clearance if necessary.
(142 psi, 981 kPa)
at
260
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.)
~
OK
CHECK EFI ELECTRONIC CIRCUIT
1. Throttle position sensor
USING VOLT/OHMMETER
BAD
2. Injection signal circuit
(See page Fl-34) ( 1) Injector wiring
(2) Fuel cut RPM (See page Fl-1 53)
(3) ECU
3. Oxygen sensor (w/ TWC)
SYMPTOM - ENGINE HESITATES AND/OR POOR ACCELERATION
CHECK CLUTCH OR BRAKES
-
1. Clutch - Slips
BAD
2. Brakes - Drag
!
OK
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
CONTINUED ON PAGE Fl-24