ec_cd20.pdf

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ENGINE CONTROL SYSTEM
SECTION EC
EC
CONTENTS
CD20T
Disassembly and Assembly ..................................... 26
DESCRIPTION ............................................................. 27
CONSULT-II ............................................................. 27
TROUBLE DIAGNOSIS - INTRODUCTION . ............... 33
Introduction .............................................................. 33
Diagnostic Worksheet .............................................. 34
TROUBLE DIAGNOSIS - WORK FLOW .................... 35
Work Flow ................................................................ 35
Description for Work Flow ....................................... 36
Basic Inspection ....................................................... 37
DESCRIPTION ............................................................. 39
Diagnostic Trouble Chart ......................................... 39
Symptom Matrix Chart ............................................. 47
Mode ........................................................................ 50
Mode ........................................................................ 51
ECM Terminals and Reference Value ..................... 52
Main Power Supply and Ground Circuit .................. 59
TROUBLE DIAGNOSIS 1 ............................................ 62
Mass Air Flow Sensor (MAFS) ................................ 62
TROUBLE DIAGNOSIS 2 ............................................ 66
TROUBLE DIAGNOSIS 3 ............................................ 70
Vehicle Speed Sensor (VSS) .................................. 70
TROUBLE DIAGNOSIS 4 ............................................ 74
TROUBLE DIAGNOSIS 5 ............................................ 78
Electric Governor ..................................................... 78
TROUBLE DIAGNOSIS 6 ............................................ 82
PRECAUTIONS AND PREPARATION .......................... 3
Special Service Tools ................................................ 3
Supplemental Restraint System (SRS)
²
AIR
BAG
²
and
²
SEAT BELT PRE-TENSIONER
²
............. 6
System of Engine ...................................................... 6
Precautions ................................................................ 7
SYSTEM ......................................................................... 9
Location ..................................................................... 9
Circuit Diagram .........................................................11
System Diagram ...................................................... 12
Vacuum Hose Drawing ............................................ 13
System Chart ........................................................... 14
SYSTEM DESCRIPTION ............................................. 15
Glow Control System ............................................... 15
Fuel Injection System .............................................. 15
Fuel Injection Timing System .................................. 18
Air Conditioning Cut Control .................................... 20
Cooling Fan Control ................................................. 20
CRANKCASE VENTILATION SYSTEM ...................... 21
Description ............................................................... 21
Blow-by Control Valve ............................................. 21
Ventilation Hose ....................................................... 21
INJECTION NOZZLE ................................................... 22
Removal and Installation ......................................... 22
Test and Adjustment ................................................ 22
ELECTRONIC FUEL INJECTION PUMP .................... 24
Removal ................................................................... 24
Installation ................................................................ 25
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Injection Timing Control Valve ................................. 82
TROUBLE DIAGNOSIS 7 ............................................ 86
Engine Control Module (ECM) ................................ 86
TROUBLE DIAGNOSIS 8 ............................................ 87
Cooling Fan (Overheat) ........................................... 87
TROUBLE DIAGNOSIS 9 ............................................ 97
Needle Lift Sensor (NLS) ........................................ 97
TROUBLE DIAGNOSIS 10 . ....................................... 100
Fuel Cut Solenoid Valve ........................................ 100
TROUBLE DIAGNOSIS 11 ........................................ 104
Fuel Temperature Sensor (FTS) ............................ 104
TROUBLE DIAGNOSIS 12 . ....................................... 108
Accelerator Position Sensor & Switch ................... 108
TROUBLE DIAGNOSIS 13 . ........................................114
Crankshaft Position Sensor (TDC) .........................114
TROUBLE DIAGNOSES 14 .......................................118
Glow Control System ..............................................118
TROUBLE DIAGNOSES 15 ...................................... 126
Air Conditioner Cut Control ................................... 126
TROUBLE DIAGNOSES 16 ...................................... 129
EGRC-Solenoid Valve ........................................... 129
TROUBLE DIAGNOSES 17 ...................................... 136
Brake Switch .......................................................... 136
TROUBLE DIAGNOSES 18 ...................................... 140
ECM Relay ............................................................. 140
TROUBLE DIAGNOSES 19 ...................................... 141
MI & Data Link Connectors ................................... 141
TROUBLE DIAGNOSES 20 ...................................... 145
Start Signal ............................................................ 145
General Specifications ........................................... 147
Injection Nozzle ..................................................... 147
Inspection and Adjustment .................................... 147
When you read wiring diagrams:
l Read GI section, “HOW TO READ WIRING DIAGRAMS”.
l See EL section, “POWER SUPPLY ROUTING” for power distribution circuit.
l See EL section for NATS information and wiring diagram.
When you perform trouble diagnoses, read GI section, “HOW TO FOLLOW FLOW CHART
IN TROUBLE DIAGNOSES” and “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN
ELECTRICAL INCIDENT”.
For clarification of system component abbreviations and terminology read GI section
“SAE J1930 TERMINOLOGY LIST”.
EC-2
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PRECAUTIONS AND PREPARATION
CD20T
Special Service Tools
Tool number
Tool name
Description
KV11289004
Nozzle cleaning kit
p
2 KV11290110
Brush
3 KV11290122
Nozzle oil sump
scraper
4 KV11290140
Nozzle needle tip
cleaner
5 KV11290150
Nozzle seat scraper
6 KV11290210
Nozzle holder
7 KV11290220
Nozzle hole clean-
ing needle
NT296
KV109E0010
Break-out box
NT825
KV109E0050
Y-cable adapter
NT826
KV11292010
Nozzle centering device
NT293
KV11100300
No. 2-4 injection nozzle
holder socket
NT563
EC-3
1 KV11290012
Box
p
p
p
p
p
p
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PRECAUTIONS AND PREPARATION
CD20T
Special Service Tools (Cont’d)
Tool number
Tool name
Description
KV119E0030
No. 1 injection nozzle
holder socket
NT648
EC-4
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PRECAUTIONS AND PREPARATION
CD20T
Engine Fuel & Emission Control System
ECM (ECCS-D control module)
l
Do not disassemble ECM.
When installing C.B. ham radio or a mobile
phone, be sure to observe the following as it
may adversely affect electronic control sys-
tems depending on its installation location.
1) Keep the antenna as far as possible away
from the ECM.
2) Keep the antenna feeder line more than
20 cm (7.9 in) away from the harness of elec-
tronic controls.
Do not let them run parallel for a long dis-
tance.
3) Adjust the antenna and feeder line so that the
standing-wave ratio can be kept small.
4) Be sure to ground the radio to vehicle body.
l
If a battery terminal is disconnected, the memory
will return to the ECM value.
The ECM will now start to self-control at its initial
value. Engine operation can vary slightly when
the terminal is disconnected. However, this is not
an indication of a problem. Do not replace parts
because of a slight variation.
l
When ECM is removed for inspection, make sure
to ground the ECM mainframe.
BATTERY
l
Always use a 12 volt battery as power
source.
l
Do not attempt to disconnect battery cables
while engine is running.
ELECTRONIC FUEL INJECTOR PUMP
l
ECM mainframe
Do not disconnect pump harness connectors
with engine running.
l
Do not disassemble or adjust electronic fuel
injection pump, except for the following
parts.
Camshaft position sensor (pump)
Injection timing control valve
Fuel cut solenoid valve
ECM PARTS HANDLING
l
Handle mass air flow sensor carefully to avoid
damage.
l
Do not disassemble mass air flow sensor.
l
Do not clean mass air flow sensor with any type
of detergent.
l
Do not disassemble No. 1 injection nozzle (built-
in needle lift sensor).
WHEN STARTING
l
Do not depress accelerator pedal when
starting.
ECM HARNESS HANDLING
l
Connect ECM harness connectors securely.
A poor connection can cause an extremely
high (surge) voltage to develop in coil and
condenser, thus resulting in damage to ICs.
l
Even a slight leak in the air intake system can
cause serious problems.
l
Immediately after starting, do not rev up
engine unnecessarily.
l
Do not shock or jar the camshaft position sensor
(TDC).
l
Do not rev up engine just prior to shut-
down.
l
Keep ECM harness at least 10 cm (3.9 in)
away from adjacent harnesses, to prevent an
ECM system malfunction due to receiving
external noise, degraded operation of ICs,
etc.
l
Keep ECM parts and harnesses dry.
l
Before removing parts, turn off ignition
switch and then disconnect battery ground
cable.
NEF390
EC-5
WIRELESS EQUIPMENT
l
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