1990 Hyundai Excel Base, 2D Hatchback, StandardFACTORY OEM SERVICE PROCEDURE

Engine Controls - Sensor Operating Range Charts: Introduction

Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems.

NOTE: All voltage tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.
AIRFLOW SENSOR VOLTAGE TEST(1)

Between Terminals Voltage
3 & 6 2.7-3.2
(1) Measure voltage with engine idling at normal operating temperature. See Fig 1 .
Fig 1: Identifying Airflow Sensor Connector
G90C04377Courtesy of HYUNDAI MOTOR CO.
COOLANT TEMPERATURE SENSOR TEST (1)

Temperature °F (°C) Volts
32 (0) 3.4-3.6
68 (20) 2.4-2.7
104 (40) 1.5-1.8
176 (80) .5-.7
(1) Measure between ECM connector B, terminal No. 9 and ground.
COOLANT TEMPERATURE SENSOR RESISTANCE TEST (1)

Temperature °F (°C) Ohms
32 (0) 5,900
68 (20) 2,500
104 (40) 1,100
176 (80) 300
(1) Measure resistance between sensor terminals.
INTAKE AIR TEMPERATURE SENSOR RESISTANCE TEST (1)

Temperature °F (°C) Ohms
32 (0) 6,000
68 (20) 2,700
176 (80) 400
(1) Measure resistance between terminals No. 2 and 4. See Fig 1 .
THROTTLE POSITION SENSOR TEST (EXCEL) (1)

Throttle Position Volts
Closed .4-.7
WOT 4.5-5.5
(1) Measure between ECM connector B, terminal No. 9 and ground.
THROTTLE POSITION SENSOR (TPS) RESISTANCE TEST (1)(2)

Throttle Position Ohms
Closed 500
WOT 3,500-6,500
(1) On 4-Cylinder models, measure between terminals No. 1 and 2. See Fig 2 .
(2) On V6 models, measure between No. 2 and 4. See Fig 3 .
Fig 2: Identifying TPS Connector Terminals (4-Cylinder)
G122024Courtesy of HYUNDAI MOTOR CO.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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