Engine JAC HFC4DA1-2C. Manual — part 47

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

187

Fault Tree:

Get the Technical Support.

Repair the harness.

Repair accordingly.

Repair accordingly.

Check starting motor connectors.

Connector fault

Check ECU connectors.

Connector fault

Check for continuity and insulating property

Electrical fault

Replace starting motor relay.

Are faults still in existence?

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

188

29.

DTC P1605

ECU instrument panel engine speed output connecting wire is short to high
level.

P1606

ECU instrument panel engine speed output connecting wire is short to
ground.

P1607

ECU instrument panel engine speed output connecting wire is open.

Fault Description: Vehicle speed sensor (VSS) provides ECU with vehicle speed information. When rotor teeth on
transmission output shaft go through sensor magnetic field, vehicle speed sensor generates signal voltage. Frequency
of this signal voltage increases with vehicle speed increase. ECU transforms the signal voltage into vehicle speed and
displays the speed on instrument panel via control circuit. ECU determines vehicle operation condition with vehicle
speed signals in order to guide driver operation. ECU monitors the circuit between ECU and instrument panel for
conditions as follows:

It is short to ground.

It is short to voltage.

It is open.

When ECU detects incorrect voltage signals, DTC occurs

Diagnosis Hint: Check harness for intermittency and good contact.

Prior to component maintenance, remove all fragments from connector surface. Check connector pads for correct
installation to prevent contamination from entering prior to diagnosis and component replacement.

z 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.

z 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.

z 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.

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

189

Fault Tree:

检查仪表板与ECU的连接

做必要的修理

接插件问题

检查连续性和绝缘性

Y

N

电气问题

Y

修理线束

更换相应的器件

N

问题仍存在

Y

联系技术支持

Get the Technical Support.

Repair the harness.

Repair accordingly.

Check connection between instrument panel

and ECU.

Connector fault

Check continuity and insulating property

Electrical fault

Replace corresponding components.

Does the problem still exist?

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

190

30.

DTC P1608

ECU instrument panel preheating indicator lamp output connecting wire is
short to high level.

P1609

ECU instrument panel preheating indicator lamp output connecting wire is
short to ground.

P160A

ECU instrument panel preheating indicator lamp output connecting wire is
open.

P160B

ECU instrument panel preheating indicator lamp output wire drive module
is overheated.

Fault Description: During glow plug operation, preheater relay will send a signal to ECU. Then, ECU sends
command to preheating indicator lamp on instrument panel via control circuit. Driver carries out the next operation
via observing preheating indicator lamp status. ECU monitors the circuit between ECU and instrument panel for
conditions as follows:

It is short to ground.

It is short to voltage.

It is open.

When ECU detects incorrect voltage signals, DTC occurs.

Diagnosis Hint: Check harness for intermittency and good contact.

Prior to component maintenance, remove all fragments from connector surface. Check connector pads for correct
installation to prevent contamination from entering prior to diagnosis and component replacement.

z 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.

z 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.

z 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

K92 Preheating

time

indicator

lamp