Vehicle Reference: ENGINE CONTROLS SENSOR OPERATING RANGE CHARTS

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Hilary Cain
6 years ago
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1 Vehicle Reference: ENGINE CONTROLS SENSOR OPERATING RANGE CHARTS INTRODUCTION Sensor operating range information can help determine if a sensor is out of calibration. An out ofcalibration sensor may not set a trouble code, but it may cause driveability problems. SENSOR OPERATING SPECIFICATIONS 1993 Toyota 4Runner 3.0L Eng SR5 NOTE: Unless stated otherwise in testing procedure, perform all voltage tests using a Digital Volt Ohmmeter (DVOM) with a minimum 10 megohm input impedance. SENSOR OPERATING SPECIFICATIONS > AIRFLOW METER NOTE: Airflow meter may be referred to as Volume Airflow (VAF) meter or Mass Airflow (MAF) meter. AIRFLOW METER RESISTANCE SPECIFICATIONS Application & Terminals Ohms Pickup 2.4L & 4Runner 2.4L E1 FC Measuring Plate Fully Closed No Continuity Measuring Plate Other Than Closed 0 E2 VC E2 VB E2 THA 4 F (20 C) 10,000 20, F (0 C) F (20 C) F (40 C) F (60 C) /6

2 E2 VS Measuring Plate Fully Closed Measuring Plate Fully Opened Pickup 3.0L, T100 & 4Runner 3.0L E1 FC Measuring Plate Fully Closed No Continuity Measuring Plate Other Than Closed 0 E2 VC E2 THA 4 F (20 C) 10,000 20, F (0 C) F (20 C) F (40 C) F (60 C) E2 VS Measuring Plate Fully Closed Measuring Plate Fully Opened For terminal identification and testing, see I SYS/COMP TESTS article in the ENGINE PERFORMANCE section. SENSOR OPERATING SPECIFICATIONS > AIR TEMPERATURE SENSOR NOTE: Air temperature sensor may be referred to as intake air temperature sensor. Air temperature sensor is an integral part of airflow meter. Check resistance at terminals E2 and THA of airflow meter. See AIRFLOW METER RESISTANCE SPECIFICATIONS table. SENSOR OPERATING SPECIFICATIONS > COLD START INJECTOR TIME SWITCH COLD START INJECTOR TIME SWITCH RESISTANCE SPECIFICATIONS Application & Terminals Temperature F ( C) Ohm Readings 2/6

3 Pickup & 4Runner 2.4L STA STJ Less Than 50 (10) " Greater Than 86 (30) L STA Ground N/A STA STJ Less Than 50 (10) " Greater Than 77 (25) T100 STA Ground N/A STA STJ Less Than 50 (10) " Greater Than 77 (25) For terminal identification and testing, see I SYS/COMP TESTS article in the ENGINE PERFORMANCE section. SENSOR OPERATING SPECIFICATIONS > COOLANT TEMPERATURE SENSOR NOTE: Coolant temperature sensor may also be referred to as Engine Coolant Temperature (ECT) sensor. Measure coolant temperature sensor resistance between sensor terminals. For resistance specifications, see Fig /6

4 Fig 1: Checking Coolant Temperature Sensor Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. SENSOR OPERATING SPECIFICATIONS > EGR GAS TEMPERATURE SENSOR EGR GAS TEMPERATURE SENSOR SPECIFICATIONS Temperature F ( C) k/ohms All Models 4/6

5 122 (50) (100) (150) 2 4 For terminal identification and testing, see I SYS/COMP TESTS article in the ENGINE PERFORMANCE section. SENSOR OPERATING SPECIFICATIONS > MANIFOLD ABSOLUTE PRESSURE SENSOR NOTE: See VACUUM SENSOR. SENSOR OPERATING SPECIFICATIONS > OXYGEN SENSOR HEATER OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS Application Ohms Pickup 2.4L F (20 C) 3.0L Calif. 2WD Only F (23 C) All Others F (20 C) T100 & 4Runner F (20 C) Measure resistance between sensor terminals +B and HT. For terminal identification, see I SYS/COMP TESTS article in the ENGINE PERFORMANCE section. SENSOR OPERATING SPECIFICATIONS > SUB OXYGEN SENSOR HEATER SUB OXYGEN SENSOR HEATER RESISTANCE SPECIFICATIONS Application T100 Ohms F (20 C) Measure resistance between sensor terminals +B and HT. For terminal identification, see I SYS/COMP TESTS article in the ENGINE PERFORMANCE section. SENSOR OPERATING SPECIFICATIONS > THROTTLE POSITION SENSOR 5/6

6 NOTE: For terminal identification and testing procedures, see I SYS/COMP TESTS article in the ENGINE PERFORMANCE section. PICKUP & 4RUNNER TPS RESISTANCE SPECIFICATIONS Application Type Clearance In. (mm) Terminals Tested Ohmmeter Reading 2.4L 0 (0) VTA & E ".022 (.56) IDL & E Or Less ".034 (.86) IDL & E2 No Continuity " Fully Open VTA & E ,100 " " VCC & E L 0 (0) VTA & E ".020 (.51) IDL & E Or Less ".031 (.79) IDL & E2 No Continuity " Fully Open VTA & E ,100 " " VC & E Apply vacuum to throttle opener before checking TPS. T100 TPS RESISTANCE SPECIFICATIONS Application Type Clearance In. (mm) Terminals Tested Ohmmeter Reading 3.0L 0 (0) VTA & E ".020 (.51) IDL & E Or Less ".031 (.79) IDL & E2 No Continuity " Fully Open VTA & E ,100 " " VC & E /6

Intake air temperature sensor may be also identified using appropriate illustration in THEORY/OPERATION article.

Intake air temperature sensor may be also identified using appropriate illustration in THEORY/OPERATION article. Page 1 of 5 ARTICLE BEGINNING INTRODUCTION Sensor operating range information can help determine if a sensor is out of calibration. An out-ofcalibration sensor may not set a trouble code, but it may cause