Mitsubishi 6M70 - Inspection of Electrical Equipment

13-90
#305 Inspection of Misubishi 6M70 intake air temperature sensor
• The intake air temperature sensor 1 may output false signals if
its tip is contaminated. Clean it if necessary. (See Gr15.)
• Place the sensor in a container filled with engine oil.
• Heat the oil to each of the specified temperatures. Stir the oil
well while doing so.
• Measure the resistance between terminals 1 and 2.
• If either measurement is out of specification, replace the sensor.
#317 Inspection of power take-off load sensor
• Apply 5 volts DC to terminals 4 and 6.
• Measure the output voltage across terminals 5 and 6 with the le-
ver at idling position A and at full-load position B.
• If measurement of full-load position B deviates from standard
value, adjust with full load stopper bolt.
• If measurement of idling position A deviates from standard val-
ue, replace the sensor.
#318 Inspection of Mitsubishi 6M70 boost pressure sensor
• Apply 5 volts DC to terminals 3 and 1.
• Apply air pressure. Gradually increase it and, while doing so,
measure the output voltage occurring at terminals 2 and 1.
• If any measurement is out of specification, replace the sensor.
#319 Inspection of Mitsubishi 6M70 common rail pressure sensor
• The sensor cannot easily be inspected in isolation, so you must
evaluate it indirectly by inspection of system harnesses and re-
lated parts.
• If there is no abnormality in any related part but the system is ab-
normal, replace the common rail.
Standard value
0°C15 kΩ
20°C6.514 kΩ
80°C 0.874 kΩ
Standard value
Lever position Output voltage
Idling position A 0.85 ± 0.1 V
Full-load position B 3.0 ± 0.1 V
Standard value
Air pressure (gauge pressure) Voltage
99 kPa {1.0 kg/cm
2
} Approx. 2.5 V
232.2 kPa {2.3 kg/cm
2
} Approx. 4.5 V
+3.78
–2.94
+1.437
–1.147
+0.136
–0.115
INSPECTION OF ELECTRICAL EQUIPMENT