Engine JAC HFC4DA1-2C. Manual — part 50

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

199

Fault Tree:

Get the Technical Support.

Repair the harness.

Repair accordingly.

Check ECU connectors.

Connector fault

Check continuity and insulating property

Control circuit failures

Check ECU.

ECU faults

Replace the ECU or refresh ECU

data.

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

200

35.

DTC

P0045

Supercharger actuator control wire is open.

P0046

ECU internal drive module of supercharger actuator control wire is
overheated.

P0047

Supercharger actuator control wire is short to ground.

P0048

Supercharger actuator control wire is short to high level.

ECU is the control center fro supercharger actuator control system. ECU calculates corresponding supercharger
actuator response according to engine operation condition. ECU realizes actuator positioning via providing
supercharger actuator control motor with pulse width modulation voltage.

Diagnosis Hint: Check for connection and disconnection faults or seizures due to temperature. Under extremely hot
or cold condition, existed contaminations or freeze may lead to unsmooth component movement.

If it is an intermittent fault, the possible causes may be poor contact, worn wire insulating layer or damaged wire in
insulating layer.

Check for the following conditions:

z Poor contact of ECU or exhaust brake valve —Check harness connectors.

– Terminal looseness

– Poor fit of matching parts

–Locking plate fracture

–Terminal deformation or damage

–Poor contact between terminal and wire

z Harness damage—Check harness for damage.

Control signal

Booster actuator

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

201

Fault Tree:

检查ECU的接插件

做必要的修理

控制线路问题

修理线束

检查连续性和绝缘性

接插件问题

检查ECU

Y

N

Y

N

ECU问题

Y

更换ECU或者刷新ECU数据

N

联系技术支持

Get the Technical Support.

Repair the harness.

Repair accordingly.

Check ECU connectors.

Connector fault

Check for continuity and insulating property.

Control circuit failures

Check ECU.

ECU faults

Replace the ECU or refresh ECU

data.

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

202

36.

DTC

P1070

Catalytic converter is clogged.

P2002

Catalytic converter is removed.

P2454

Catalytic converter front and rear differential pressure is too low.

P2455

Catalytic converter front and rear differential pressure is too high.

Differential pressure sensor is a Hall Effect switch. ECU provides differential pressure sensor with 5V voltage via 5V
reference voltage circuit and provides the sensor with grounding via low reference voltage circuit. Differential
pressure sensor provides ECU with signal voltage according to front and rear differential pressure changes of catalytic
converter. ECU determines catalytic converter differential pressure with this signal voltage. Differential pressure
sensor circuit is connected to ECU directly. Moreover, differential pressure sensor can be applied in determination of
catalytic converter damages. Circuits between differential pressure sensor and ECU include the followings:

Differential pressure sensor high reference voltage circuit

Ground circuit

Differential pressure signal circuit

When ECU detects incorrect sensor signals or no signals, DTC occurs.

Diagnosis Hint: Poor terminal connection—Check harness connectors for looseness, mismatching, retainer damage,
improper shape or damage and connection failure with wires. Apply corresponding matching terminals for test of
proper tension.

Harness damage—Check wire harness for damage. In the case of no harness faults, move relevant connectors and
wire harness and observe display of fault diagnostic apparatus. Fault diagnostic apparatus displays changes to indicate
fault positions.

Check ECU and engine ground connection for reliability and cleanness. If it is determined that DTC is an intermittent
fault, please refer to Fault Record to check the time of last DTC occurrence.

Terminal ECU

K27

Differential pressure sensor power supply

K59

Differential pressure sensor signal terminal

K80 Ground

Differential

pressure

sensor

5V power supply

Differential pressure signal

Ground