ABNORMALITY IN ENGINE SUB REVOLUTION SENSOR PULSE NUMBER (DTC CODE P0341 / DIAGNOSIS MONITOR CODE 12)

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Symptom of malfunction	Engine rpm is instable. Cruise functions are disabled.
Output limit, etc.	Without
Malfunction indicator light	Light out
Multi information	Engine system failure
Possible cause of malfunction	Abnormality in engine sub 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 E54 and E73.

ECU terminal No. Description of terminal

E54

G GND

E73

G SIG

Standard: 7 pulses in an interval between adjacent convex 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 sub revolution sensor connector connected.
Start the engine.
Measure a waveform between the 1st and 2nd terminals of the engine sub revolution sensor connector (vehicle harness side).

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

Standard: 7 pulses in an interval between adjacent convex waves

After measurement, stop the engine.

NO

Fault in engine sub revolution sensor or pulsar YES

Irregular contact of connectors

DTC Clear

Detail

Confirm the DTC P0341 is inactive

Start the engine and let it idling condition.
Verify the DTC P0341 is inactive.

DTC Clear

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

P0341 is reoccur: Return to first process
Other DTC appear: Refer to concerned Trouble shooting

Complete