Toyota COMPUTER-CONTROLLED SYSTEM Training Manual page 110

ESA - Functions of Engine EC U
2 . IGNITION TIMING ADJUSTMEN T
The angle to which the ignition timing is set
during ignition timing adjustment is called the
"standard ignition timing ." It consists of the
initial ignition timing (See page 83), plus a fixed
ignition advance angle (a value that is stored in
the ECU and output during timing adjustment
regardless of the corrections, etc ., that are used
during normal vehicle operation) .
Initial ignition timing angl e
Fixed ignition advance
angl e
Standard ignition
timing angle
OHP 68
Ignition timing adjustment is carried out as
follows :
1) Set the standard ignition timing by
connecting terminal Ti (or TEi) of the check
connector or TDCL with terminal Ei, with the
idle contacts on . This will cause the standard
ignition timing signal to be output from the
back-up IC in the same way as during after-
start ignition control (See page 91) .
Check connector
TorTE1
El
TDCL
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SST
El
TE1
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The standard ignition timing differs
depending on the engine model, as shown in
the following table . When tuning up the
engine, refer to the repair manual for the
relevant engine .
FIXE D
ENGINE
INITIAL
IGNITION
STANDAR D
IGNITION
IGNITION
MODEL ADVANC E
TIMING TIMIN G
ANGLE
Type 1
100
BTDC
0° BTDC
10
0
BTDC
Type 2 5° BTDC
50
BTDC
10° BTDC
Type 3
70
BTDC
0° BTDC 7° BTDC
OHP 6 8
2) If the standard ignition timing is not as
specified above, adjust it .
/.--
NOT E
1 . Even if terminal T1 or TE1 and terminal E1
are connected, the ignition timing will not
be fixed at the standard ignition timing
unless the idle contacts are on .
2 . Since the G and NE signal generators are fix-
ed in recent models, there are cases in
which ignition timing cannot be adjusted .
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