1995 TOYOTA SUPRA width

DTC 14 Ignition Signal Circuit
CIRCUIT DESCRIPTION
The ECM determines the ignition timing, turns on Tr1 at a predetermined angle (°CA) before the desired ignition
timing and outputs an ignition signal (IGT) º1º to the igniter.
Since the width of the IGT signal is constant, the dwell angle control circuit in the igniter determines the time
the control circuit starts primary current flow to the ignition coil based on the engine rpm and ignition timing one
revolution ago, that is, the time the Tr
2 turns on.
When it reaches the ignition timing, the ECM turns Tr
1 off and outputs the IGT signal ºOº.
This turns Tr
2 off, interrupting the primary current flow and generating a high voltage in the secondary coil which
causes the spark plug to spark. Also, by the counter electromotive force generated when the primary current
is interrupted, the igniter sends an ignition confirmation signal (IGF) to the ECM.
The ECM stops fuel injection as a fail safe function when the IGF signal is not input to the ECM.
 DTC No. Diagnostic Trouble Code Detecting Condition Trouble Area 
 
 
 
14
 
 
 
 
No IGF signal to ECM for 4 ~ 7 consecutive
IGT signals with engine speed less than
3,000 rpm
 
 
 
 

Open or short in IGF circuit from igniter to
ECM

Igniter

ECM
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±519

Tab width
0.64 mm
INTRODUCTION±GENERAL INFORMATION
A±1
2
Wire Harness Repair Manual (RM1022E)
GENERAL INFORMATION
This manual provides instruction in the following repairs:

How to Inspect for System Inspection

Circuit Protection

Terminal and Connector Repair Procedure
NOTICE:
When inspecting or repairing the SRS AIRBAG, be sure to carefully read the precautionary
instructions and procedure in the Repair Manual for the applicable model.
After any electrical repair is made, always test the circuit by operating the devices in the circuit. This
confirms not only that the repair is correct, but also that the cause of the complaint was correctly
identified.
Terminal type number name
The terminal type number naming system has changed:
the metric system will be used in place of the inch system.
To be more specific, male tab width ºin millimetersº will be
used as terminal type number from now on ±± in place of
male tab width in inches which has been in use so far.
Below is a table of comparison:
Old terminal type No.
(inch)
New terminal type No.
(mm)
025"0.64
040 (II, III, IV)"1.0 (II, III, IV)
050"1.3
070 (II)"1.8 (II)
090 (II)"2.3 (II)
187"4.8
250 (II)"6.3 (II)
305"7.7
312"8.0
375"9.5
For those connectors which are not shown above, the
terminal type numbers remain unchanged.
A

LY±
(Blue) (Yellow) Example: L±Y
Tab width
1.3 mm
Rubber
Plug
Rubber Ring
Housing Lance
Type
Terminal Lance
Type
INTRODUCTION±GENERAL INFORMATION
A±3
4
Wire Harness Repair Manual (RM1022E)
The first letter indicates the basic wire color and the second
letter indicates the color of the stripe.
Terminal and housing
Terminal connects wires and housing insulates connecting
parts.
There are the male terminal and the female terminal. The
types of terminals are decided by tab width of male
terminal. And the terminal with the rubber plug or the
rubber ring is used in the part, such as the engine
compartment, which become wet. For the circuit with slight
current at EFI system or ABS system, the gold±plated
terminal is introduced for ensuring reliabilities.
As the number of the circuit is increasing recently, there are
new types of parts introduced. For example, there is the
hybrid type housing, which is a combination of terminals
with different tab width, such as the power source terminal
or the signal terminal. Also, new type of connector such as
the double lock housing, which is designed with the
retainer in addition to the lance to prevent terminal from
slipping off, is available. The new type of connectors are
produced to realize higher product reliabilities and utilized
widely recently. The major characteristics of these new
connectors are shown in the table 1.
There are two types of lances: housing lance, which is
inside the housing and terminal lance, which is inside the
terminal.A

Three or More Times
10 mm (0.39 in.)
Tape overlapping
10 mm (0.39 in.)
Two or More Times
Finish
B±31
TERMINAL AND CONNECTOR REPAIR±TERMINAL REPLACEMENT
41
Wire Harness Repair Manual (RM1022E)
HINT:

Before starting the operation, thoroughly wipe dirt and
grease off the sections to be joined.

If the adhesive surfaces of two tapes come in contact
they will stick together and will not come apart, so do
not remove the backing film except when using the
tape.

Do not let oil and dust, etc. get on the tape surface.
(a)Ready about 100 mm (3.94 in.) of silicon tape (Part
No. 08231±00045) and peel off the film.
(b)Stretch the silicon tape until its width is reduced by
half.
(c)About 10 mm (0.39 in.) from the end of the sleeve,
wrap the silicon tape around the sleeve three or more
times while stretching the tape.
(d)Wrap the remaining part of the sleeve with half of the
tape overlapping at each turn.
(e)Firmly wrap the tape two times or more about 10 mm
(0.39 in.) from the other end of the sleeve, then wrap
the tape back towards the start again and firmly finish
winding the tape around the center of the sleeve.

Connector A
Connector B
Connector A
Lass than 1mmConnector B
Bolt
Cross±section of the bolt
TERMINAL AND CONNECTOR REPAIR±HOW TO INSTALL AND REMOVE SPECIAL CONNECTORS
B±52
62
Wire Harness Repair Manual (RM1022E)
Connector fixed by bolts
1. Area used

Engine control computer harness
2. Cut the connection of the connector.
(1)Remove the connector A.
(2)Loose the bolt using a tool like driver until the
connector B can be removed by hand and separate
the connector.
HINT: If the bolt can not be removed, roll it while pulling
forward.
3. Connection of the connector
(1)Temporarily fit the connector B.
(2)Tighten the bolt by using tool like driver and fit the
connector B completely.
NOTICE:

Tighten the bolt until feeling it lighter. Then confirm
that the width of chink of the connector B is less
than 1mm.

The bolt can be rolled after it is fitted.

If the impact wrench is used, do not let it rolling
more than three seconds. (The housing may be
deformed by generated heat)

Be sure and connect the connector B straight. Do
not incline it while connecting.
(3)Connect the connector A.