ABNORMALITY IN ENGINE MAIN REVOLUTION SENSOR PULSE NUMBER (DTC CODE P0336 / DIAGNOSIS MONITOR CODE 13)

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Symptom of malfunction	Engine rpm is instable. Cruise functions are disabled.
Output limit, etc.	Output limit
Malfunction indicator light	Light out
Multi information	Engine system failure
Possible cause of malfunction	Abnormality in engine main revolution sensor pulse

1. Measuring an input waveform of the engine ECU

Detail

Set the starter key to the "LOCK" position and connect the signal check harness.
Start the engine.
Measure a waveform between the terminals E52 and E72.

ECU terminal No. Description of terminal

E52

NE (+)

E72

NE (-)

Standard: 56 pulses in an interval between adjacent concave waves

After measurement, stop the engine.

NO

Go to [2] Measuring an output waveform of the sensor. YES

Fault in engine ECU and/or ECU connectors

2. Measuring an output waveform of the sensor

Detail

Keep the engine main revolution sensor connector connected.
Start the engine.
Measure a waveform between the 1st and 2nd terminals of the engine main revolution sensor connector (vehicle harness side).

This diagram shows the engine main revolution sensor connector as viewed from the connecting face.

Standard: 56 pulses in an interval between adjacent concave waves

After measurement, stop the engine.

NO

Fault in engine main revolution sensor or flywheel pulsar, irregular contact of connector
YES

Faulty harness

DTC Clear

Detail

Confirm the DTC P0336 is inactive

Start the engine and let it idling condition.
Verify the DTC P0336 is inactive.

DTC Clear

Clear the DTC with Hino DX
Confirm the same DTC is not reoccurred

P0336 is reoccur: Return to first process
Other DTC appear: Refer to concerned Trouble shooting

Complete