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INSPECTION AND ADJUSTMENT

- Variable Resisto

VARIABLE RESISTO

OBJECTIVE

To learn the procedure for inspecting the variable resistor

PREPARATION

Volt- and ohmmeter (also called "circuit tester" or "multi-tester")

APPLICABLE

ENGINE

: 4A-FE (

Sep

., 1989

)

INSPECTION OF VARIABLE RESISTO

. INSPECT

VOLTAGE OF

VARIABLE RESISTO

(a) Using a voltmeter, measure the voltage between

ECU terminals VC and E2

Voltage

: 4 - 6

(b) Measure the voltage between ECU terminals VAF

and E2 while slowly turning the idle mixture

adjusting screw, first fully counterclockwise, then

fully clockwise

184

Table of Contents4
Abbreviations and Ecu Terminal Symbols7
- Abbreviations7
- Ecu Terminal Symbols8
Outline of Tcc S11
- What Is Tccs11
- History of Tccs Engine Control System12
- System Description13
Electronic Control Syste M19
- General19
- Power Circuitry21
  - Engine Without Stepper Motor Typ E21
    - ISC Valve22
  - Engine with Stepper Motor Type22
- VC Circuitry22
- Ground Circuitry22
- Manifold Pressure Sensor23
  - (Vacuum Sensor)23
- Air Flow Meter24
  - Vane Type24
    - Optical Karman Vortex Type27
    - Hot-Wire Type28
- Throttle Position Sensor30
  - On-Off Type30
  - Linear Type31
- G and Ne Signal Generators32
- Water Temperature Sensor39
- Intake Air Temperature39
- Sensor39
- Oxygen Sensor (02 Sensor)40
- Zirconia Element Type40
- Titania Element Type42
- Lean Mixture Sensor43
Vehicle Speed Sensor44
- Reed Switch Type44
- Photocoupler Type44
- Electromagnetic Pickup Type45
- MRE Type47
Sta Signal48
Nsw Signal48
Electrical Load Signal49
Fuel Control Switch or50
- Connector50
Egr Gas Temperature Sensor50
Variable Resistor51
Kick-Down Switch52
Water Temperature Switch52
Clutch Switch52
Knock Sensor53
Hac Sensor54
Vapor Pressure Sensor54
Turbocharging Pressure Sensor54
Stop Lamp Switch55
Oil Pressure Switch55
Communications Signals55
- Throttle Opening Angle Signals55
- Throttle Opening Angle Signals Fo R55
  - TRC System56
- Cruise Control System56
  - Communications Signal56
  - TRC System Communications Signal56
- Intercooler System Warning Signal56
  - Signal56
- Engine Speed Signal57
- Engine Immobiliser Syste M57
Diagnostic Terminal(S)58
General59
Efi (Electronic Fuel Injection )59
Types of Efi62
D-Type EFI62
- Appendix150
- Diagnostic Codes150
- Fail-Safe Function153
- Back-Up Function155
- Troubleshootin Ggeneral157
- How to Carry Ou Ttroubleshooting158
- Pre-Diagnostic Questioning159
- Symptom Chart162
- Check Engine" Lamp Check167
- Checking and Clearing Diagnostic167
- Output of Diagnostic Code S167
- Normal Mode169
- Test Mode169
- Clearing Diagnostic Code170
- Is Symptom Simulation173
- Basic Inspection174
- Inspection and Adjustmen Tgeneral178
- Idle Speed and Idle Mixture179
- (Vacuum Sensor)181
- Manifold Pressure Senso R181
- Body183
- Throttle Position Sensor (Linear Type) and Throttle183
- Distributor (G and Ne Signals)186
- Intake Air Temperature Sensor187
- Feedback Correction188
- Models with Oxygen Senso R188
Models with Lean Mixture Sensor189
Variable Resistor190
- Isc Valv E (Duty-Control Acv Type)192

Brand	Toyota
Model	COMPUTER-CONTROLLED SYSTEM
Category	Automobile Accessories
Language	English

Toyota COMPUTER-CONTROLLED SYSTEM User Manual

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Toyota COMPUTER-CONTROLLED SYSTEM Specifications

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