brake sensor TOYOTA CELICA 1987 Service Repair Manual

EFI SYSTEM - Troubleshooting
FI-23
SYMPTOM - ENGINE HESITATES AND/OR POOR ACCELERATION
CHECK CLUTCH AND BRAKE .
BAD
I
I 1
1 OK
CHECK FOR VACUUM LEAKS IN AIR
INTAKE LINE
I OK BAD
I-
1. Clutch - Slips
2. Brakes - Drag
1. Oil filler cap
2. Oil level gauge
3. Hose connections :
4. PCV hose
5. EGR system - EGR valve stays open (EGR)
4
CHECK AIR FILTER ELEMENT
BAD Element - Clean or replace
I
,,: -. OK
7
. . 1 i , 1
CHECK DIAGNOSIS SYSTEM
Check for output of diagnostic code.
(See page FI-26) Malfunction
I-- code Diagnostic code(s) (See pages FI-30, 31, 32)
I
I I I J
1 Normal code
CHECK IGNITION SPARK
7M-GE (See page IO-61
7M-GTE (See page 16-12) .
BAD
I
I OK
CHECK IGNITION TIMING
1. Short terminals T(MA1 or TEl (MS) and
El of the check connector.
2. Check ignition timing.
‘i, STD: 10” BTDC @ Idling
I short circuited TiMA) or
I
I OK
CHECK FUEL PRESSURE
(See page Fl-74) 1. High-tension cords
2. Distributor (7M-GE) or cam position
sensor (7M-GTE)
3. Ignition coil
4. Igniter
NO Adjust. ignition timing. (See page EM- 17)
I
I
BAD
I
1. Fuel pump (See page Fl-73)
2. Fuel Filter
3. Fuel pressure regulator (See page Fl-84)
1
OK
CHECK INJECTORS
(See page FI-86) BAD c Injection condition
OK CONTINUED ON PAGE FI-24

EM-20 ENGIN lVlECHAN!CAL - Engine Tune-up
-.
EM288
c
HC
Aigh
High
High co
Normal
Low
High ‘- ‘, If the CO concentration is not as specified, adjust the idle
mixture by.furning the idle mixture adjusting screw with
SST.
SST 09243-00020 >
0 If the CO concentration is within specification, this
adjustment is complete.
l if the CO concentration cannot be corrected by idle
mixture adjustment, see the table below for other possi-
t ble causes. w
Troubleshooting
SYMPTOMS
Rough idle
’ ’
.-‘:I -
Rough idle
(Fluctuating HC reading)
Rough idle
(Black smoke from exhaust CAUSES
1. Faulty ignition:
0 Incorrect timing
0 Fouled, shorted or improperly gapped plugs
6 Open or crossed high-tension cords
0 Cracked distributor cap
2. Incorrect valve clearance
3. Leaky EGR valve
4. Leaky intake and exhaust valves
5. Lea,kv cvlinder
1. Vacuum leak:
0 Vacuum hose
0 EGR valve
0 Intake manifold (Air intake chamber)
0 Throttle body
l Cylinder head gasket,
0 Brake booster line
2. Lean mixture causing misfire
1. Restricted air filter
2. Faulty ,EFI system:
0 Faulty pressure regulator
0 Clogged fuel return line
0 Faulty air flow meter
0 Defective water temp. sensor
0 Defective air temp. sensor
0 Faulty ECU
l Faulty injector
0 Faulty cold start injector
l Faulty throttle position sensor