TOYOTA CAMRY 2000 Service Repair Manual

wDuring cranking or idling, check waveforms be±
tween terminals G1, G2, NE and G O of engine
control module.
HINT: The correct waveforms appear as shown in the
illustration on the left.
Disconnect distributor connector.
Measure resistance between each terminal
shown in table below.
Check for open and short in harness and connector between
engine control module and distributor (See page IN±31).
ªColdº is from ±10
C (14
F) to 50
C (122
F) and ªHotº is
from 50
C (122
F) to 100
C (212
F).
Check resistance of each pickup coils in distributor.
INSPECTION USING OSCILLOSCOPE
Repair or replace harness or connector.
INSPECTION PROCEDURE
Replace distributor.
Reference
Resistance
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±341

Remove distributor cap & rotor.
Using SST (G1 and G2 pickups) and a thickness
gauge (NE pickup), measure the air gap between
the signal rotor and pickup coil projection.
SST 09240±00020 for G1 and G2 pickups
Air gap: 0.2±0.5 mm (0.008±0.020 in.)
Check and replace engine control module.Replace distributor housing assembly.
Check air gap.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±342

*: Only for California specification vehicles.
CIRCUIT DESCRIPTION
Refer to G, NE signal circuit (No. 1) on page EG1±336, 339.
No G signal to ECM while N E signal is input 4
times to ECM when engine speed is between
500 rpm and 4,000 rpm.
* NE signal does not pulse 12 times to ECM
during the interval between G1 and G2 pulses.* No NE signal to ECM for 0.1 sec. or more at
1,000 rpm or more.No NE signal to ECM for 0.3 sec. or more at
1,500 rpm or more.
wOpen or short in NE circuit
wDistributor
wECM Diagnostic Trouble Code Detecting ConditionTrouble Area
DTC 13 G NE Signal Circuit (No.2)
DTC No.
DIAGNOSIS
This code indicates that a momentary interruption of the G, N E signal from the distributor to the
ECM has occurred, but that it is returned to normal. Note that although this problem may not nec-
essarily appear at the time of inspection, it cannot be ignored because this diagnostic trouble code
is output, indicating that there is or was a malfunction in the G, NE signal circuit; this ªmalfunctionº
is usually a loose connector.
The distributor connector and the N E terminal of the ECM connector must therefore be checked
for the following:
1. Loose connectors
2. Dirty connector terminals
3. Loose connector terminals
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±343

CIRCUIT DESCRIPTION
The ECM determines the ignition timing, turns on Tr, at a predetermined angle ('*CA) before the
desired ignition timing and outputs an ignition signal (IGT) ª1º 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, off and outputs the IGT signal ªOº.
This turns Tr2 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 lG F signal is not input to the ECM.
wOpen or short in IG F or IGT circuit from
igniter to ECM.
wIgniter
wECM No IGF signal to ECM for 4 (8*2) consecutive
IGT signals. Diagnostic Trouble Code Detecting Condition
WIRING DIAGRAM
Trouble Area
DTC 14 Ignition Signal Circuit
DTC No.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±344

Check for open and short in IGF signal circuit
between igniter and ECM.
Check for open and short in IGT signal circuit
between igniter and ECM. Check voltage of terminal IGT (Disconnect
igniter connector).Check for open and short in primary coil
circuit.Check and repair igniter power
source circuit.Repair or replace harness or
connector.
Repair or replace harness or
connector.
Repair or replace harness or
connector. Check voltage of igniter power source.
DIAGNOSTIC CHART
Check voltage of terminal I G F.
Check voltage of terminal IGT.
Check and replace ECM.Check and replace ECM.
Replace ignition coil.
Check ignition coil.Check for spark.
Replace igniter.
Replace igniter.
Replace igniter.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±345

Disconnect the high±tension cord from the distributor, hold its end about 12.5 mm (11 /2º)
from the ground, see if spark occurs while the engine is being cranked.
Spark should be generated.
To prevent excessive fuel injected from the injectors during this check, don't crank the
engine for more than 1 ± 2 seconds at a time.
(1) Disconnect igniter connector.
(2) Remove glove compartment.
(See page EG1±234).
(3) Turn ignition switch on.
Measure voltage between terminal IGF of engine
control module connector and body ground.
Voltage: 4.5 ~ 5.5 V
Check for open and short in harness and connector in IGF signal
circuit between engine control module and igniter (See page IN±31).
Disconnect igniter connector and check voltage between terminal
IGF of engine control module connector and body ground.
Check and replace engine control module.Repair or replace harness or connector.
INSPECTION PROCEDURE
Check for spark.
Replace igniter.
Go to step
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±346

Remove glove compartment.
(See page EG1±234) .
Measure voltage between terminal IGT of engine
control module connector and body ground
when engine is cranked.
Voltage: 0.5 ± 1.0 V
(Neither 0 V nor 5 V)
wDuring cranking or idling, check waveform between
terminal IGT and E1 of engine control module.
HINT: The correct waveform appears as shown in the
illustration on the left, with rectangle waves.
Check voltage between terminal IGT of engine control module
connector and body ground.
INSPECTION USING OSCILLOSCOPE Reference
Go to step
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±347

Disconnect igniter connector.
Measure voltage between terminal 3 of igniter
connector and body ground, when ignition
switch is turned to ªONº and ªSTAº position.
Voltage: 9 ~ 14 V
Check for open and short in harness and connector between ignition
switch and ignition coil, ignition coil and igniter (See page IN±31). Check voltage between terminal 3 of igniter connector and body
ground.
Check and repair igniter power source
circuit.
Repair or replace harness or connector.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±348

For California spec.
(1) Disconnect ignition coil connector.
(2) Disconnect high±tension cord from ignition
coil.
Exc. California spec.
(1) Disconnect distributor connectors.
(2) Remove distributor cap and rotor.
(3) Remove ignition coil dust cover.
(1) Check primary coil.
Measure resistance between the positive
(+) and negative (±) terminals.
(2) Check secondary coil.
Measure resistance between the positive
(+) and high±tension terminals.
ªColdº is from ±10

C (14
F) to 50
C (122
F) and
ªHotº is from 50

C (122
F) to 100
C (212
F).
Check ignition coil.
Replace ignition coil.
Replace igniter.
Secondary
CoilPrimary
CoilResistanceCold
Cold
HotHot
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±349

Disconnect igniter connector.
Measure voltage between terminal IGT of engine
control module connector and body ground
when engine is cranked.
Voltage: 0.5±1.0 V
(Neither 0 V nor 5 V)
Check for open and short in harness and connector in IGT signal
circuit between engine control module and igniter (See page IN±31). Disconnect igniter connector and check voltage between terminal
IGT of engine control module connector and body ground.
Check and replace engine control module.Repair or replace harness or connector.Replace igniter.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±350