FUSO 4M4 – EMISSION CONTROL – EXHAUST GAS RECIRCULATION SYSTEM – Inspection of Electrical Equipment

#201 Inspection of relay (normally open, 5 pins)
• Perform a continuity check and an operation check. If there is any abnormality, replace the relay.

#305 Inspection of air temperature sensor
<Intake air temperature sensor 1>
• 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.

<Intake air temperature sensor 2>
• 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.

#529 Inspection of intake throttle
• Perform the following checks. If there is any abnormality, replace the intake throttle.
(1) Coil resistance of motor
• Measure the resistance between terminals 5 and 6.

NOTE
• If the measurement deviates from the standard value, measure the resistance again after manually opening and closing the butterfly valve 5 times.
(2) Position sensor
• The sensor cannot easily be inspected in isolation, so you must evaluate it indirectly by inspection of system harness and related parts.
• If there is no abnormality in any related part but the system is abnormal, replace the intake throttle.

#530 Inspection of exhaust gas recirculation valve
• Perform the following checks. If there is any abnormality, replace the exhaust gas recirculation valve.
(1) Coil resistance of motor
• Measure the resistance between terminals 8 and 7, the resistance between terminals 8 and 6, and the resistance between terminals 7 and 6.

(2) Position sensor
• The sensor cannot easily be inspected in isolation, so you must evaluate it indirectly by inspection of system harness and related parts.
• If there is no abnormality in any related part but the system is abnormal, replace the exhaust gas recirculation valve.

#828 Inspection of controller area network resistor
• Measure the resistance between terminals 1 and 2.

• If the measurement is out of specification, replace the controller area network resistor.

 

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