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HOMESERVICE MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - PINPOINT TESTS - (HYBRID)PINPOINT TEST DA: INTAKE AIR TEMPERATURE (IAT) SENSORINTRODUCTION
2010 Mercury Mariner Hybrid, AWD

Pinpoint Test DA: Intake Air Temperature (IAT) Sensor: Introduction

2010 Mercury Mariner Hybrid, AWDSECTION Introduction
WARNING: TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE HYBRID SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.

This pinpoint test is intended to diagnose the following:

  • integrated mass air flow (MAF)/intake air temperature (IAT) sensor (12B579)
  • harness circuits: IAT and SIGRTN
  • powertrain control module (PCM) (12A650)

Voltage values calculated for VPWR equals 5 volts. These values can vary by 15% due to sensor and VPWR variations.

Fig 1: Temperature And Voltage Characteristic Graph
G06053965Courtesy of FORD MOTOR CO.
TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS

Temperature Temperature Sensor Values
°C °F Voltage Resistance (K ohms)
120 248 0.28 1.18
110 230 0.36 1.55
100 212 0.47 2.07
90 194 0.61 2.80
80 176 0.80 3.84
70 158 1.05 5.37
60 140 1.37 7.70
50 122 1.77 10.97
40 104 2.23 16.15
30 86 2.74 24.27
20 68 3.26 37.30
10 50 3.73 58.75
0 32 4.14 95.85
-10 14 4.45 160.31
Fig 2: Mass Air Flow/Intake Air Temperature (MAF/IAT) Sensor Connector
G06288723Courtesy of FORD MOTOR CO.
RENDER: 1.0x

NO RELATED

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