Engine Hesitates And/Or Poor Acceleration - Toyota 7M-GE 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