ABNORMALITY IN AIR SUPPLY CONTROL DURING DRIVING
(DTC CODE C3422 / DIAGNOSIS MONITOR CODE 29)

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Criterion for determining	A command to supply air supply to each valve exceeds the set time.
Inspection area and possible cause	Inspection area: Height sensor and related circuit(s), air suspension ECU Possible cause: Abnormality in height sensor, disconnection and/or short-circuit of related circuit(s) Abnormality in air suspension ECU, air leakage

1. Inspecting the air suspension piping, air tank and air spring

Detail

Inspect each area for breakage and abnormality.
Standard: No abnormality

NO

Abnormality in air circuit
YES

Proceed to [2] Inspecting the front and rear right/left height sensors and link rods

2. Inspecting the front and rear right/left height sensors and link rods

Detail

Inspect the front and rear right/left height sensors and the link rods for breakage and abnormality.
Standard: No abnormality

NO

Abnormal vehicle height sensor
YES

Abnormality in air suspension ECU

DTC Clear

Detail

Confirm the DTC C3422 is inactive

Start the engine and let it idling condition.
Verify the DTC C3422 is inactive.

DTC Clear

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

C3422 is reoccur: Return to first process
Other DTC appear: Refer to concerned Trouble shooting

Complete

ABNORMALITY IN AIR SUPPLY CONTROL DURING DRIVING (DTC CODE C3422 / DIAGNOSIS MONITOR CODE 29)

1. Inspecting the air suspension piping, air tank and air spring

2. Inspecting the front and rear right/left height sensors and link rods

DTC Clear

ABNORMALITY IN AIR SUPPLY CONTROL DURING DRIVING
(DTC CODE C3422 / DIAGNOSIS MONITOR CODE 29)