diagram TOYOTA CAMRY 2000 Service User Guide

± 5S±FE ENGINEWIRING DIAGRAMEG1±317

Check for open and short in harness and
connector between ECM and distributor.Check resistance of each pickup coils in
distributor.
Repair or replace harness or connector.
DIAGNOSTIC CHART
WIRING DIAGRAM
Replace distributor housing.
Replace distributor housing.
Check and replace ECM. Check air gap.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±337

Check for open and short in harness and
connector between ECM and distributor. Check resistance of each pickup coils in
distributor.
Repair or replace harness or connector.
DIAGNOSTIC CHART
WIRING DIAGRAM
Check and replace ECM.Replace distributor. Replace distributor.
Check air gap.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±340

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

Are there any other codes (besides code 21)
being output ?Go to relevant diagnostic trouble code
chart.
DIAGNOSTIC CHART
WIRING DIAGRAM
Replace main oxygen sensor.YES
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±354

DIAGNOSTIC CHART
HINT If diagnostic trouble codes ª22º (engine coolant temperature sensor circuit), ª24º (intake air temperature sensor cir-
cuit), ª31º (manifold absolute pressure sensor circuit) and ª41º (throttle position sensor circuit) are output simultaneously, E2
(sensor ground) may be open, OK Check for momentary interruption
Check for open and short in harness and connector
between ECM and engine coolant temp. sensor.Check for momentary interruption
(See page EG1±309).
Repair or replace harness or
connector.Replace engine coolant temp. sensor.
WIRING DIAGRAM
Check resistance of sensor.
Check and replace ECM.Check voltage of sensor.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±357

DIAGNOSTIC CHART
HINT: If diagnostic trouble codes ª22º (engine coolant temperature sensor circuit), ª24º (intake air
temperature sensor circuit), ª31º (manifold absolute pressure sensor circuit) and ª41º (throt±
tle position sensor circuit) are output simultaneously, E2 (sensor ground) may be open.
CIRCUIT DESCRIPTION
The intake air temp. sensor is built into the air cleaner cap and senses the intake air tempera-
ture. The structure of the sensor and connection to the ECM is the same as in the engine coolant
temp. sensor shown on page EG1±356.
If the ECM detects the diagnostic trouble code ª24º, it operates the fail safe function in which the
intake air temperature is assumed to be 20

C (68
F)
w
Open or short in intake air temp. sensor circuit.
wIntake air temp. sensor
wECM
Check for open and short in harness and
connector between ECM and intake air temp.
sensor.Open or short in intake air temp. sensor circuit
for 0.5 sec. or more.
Check for momentary
interruption (See page EG1±309). Diagnostic Trouble Code Detecting Condition
Repair or replace harness or
connector.Replace intake air temp. sensor.
WIRING DIAGRAM
Check resistance of sensor.
Check and replace ECM. Check voltage of sensor.Trouble Area
DTC 24 Intake Air Temp. Sensor Circuit
DTC No.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±360

WIRING DIAGRAM
Refer to page EG1±354 for the WIRING DIAGRAM.
Does malfunction disappear when a good main
oxygen sensor is installed?Check each item found to be a possible cause
of problem.
Does malfunction disappear when a good main
oxygen sensor is installed?Check each item found to be a possible cause
of problem.Check for open and short in harness and
connector.Repair or replace harness or
connector.
DIAGNOSTIC CHART
Check voltage of terminal OX1.Check voltage of terminal VF1.
Replace main oxygen sensor.
Replace main oxygen sensor. Check and replace ECM.
Check and replace ECM.Check compression.
Check compression.Repair or replace.
Repair or replace.Repair or replace.
Repair or replace.N G TypeII
NG Type I
YESYES
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±365

Are there any other codes (beside Code 27)
being output?Go to relevant diagnostic trouble
code chart.
DIAGNOSTIC CHART
WIRING DIAGRAM
Replace sub oxygen sensor.YES
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±371

Check for open and short in harness and
connector between manifold absolute pressure
sensor and ECM.
Check and replace manifold absolute pressure
sensor.When diagnostic trouble code 31 is
displayed, check and replace ECM.
Repair or replace harness or
connector.
DIAGNOSTIC CHART
Check voltage of terminal PIM.Check voltage of terminal VC. Check and replace ECM.
DIA RAMWIRING DIAGRAM
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±373