Engine JAC HFC4DA1-2C. Instruction - page 46

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

183

Fault Tree:

Repair accordingly.

Check relay connectors.

Connector fault

Check ECU connectors.

Connector fault

Check continuity and insulating property..

Electrical fault

Repair the harness.

Repair accordingly.

Replace the relay (carry out ISO cycle).

ISO cycle faults

Get the Technical Support.

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

184

27.

DTC

P0487

Throttle valve actuator control wire is open.

P0488 ECU internal drive module of throttle valve actuator is overheated.

P2141 Throttle valve actuator control wire is short to ground.

P2142

Throttle valve actuator control wire is short to high level.

Fault Description: ECU is the control center for throttle valve actuator control system. ECU can judge driver’s
intention and then calculate corresponding throttle valve response. ECU realizes throttle valve positioning via
providing throttle valve actuator control motor with pulse width modulation (PWM) voltage. Throttle valve actuator
control system adopts circuits as follows:

Motor control 1

Motor control 2

Besides, two processors are applied in throttle valve actuator control system data monitoring. These two processors
are located in ECU, testing data of each other to prove correctness of throttle valve position.

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.

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

185

Fault Tree:

Check throttle valve actuator

connection.

Connector fault

Repair or replace.

Check throttle valve appearance.

Throttle valve faults

Check ECU connectors.

Replace the ECU.

Repair or replace.

Replace the throttle valve.

Get the Technical Support.

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

186

28.

DTC

P0615

ECU starting motor control wire is open or drive module is overheated.

P0616 ECU starting motor control wire is short to ground.

P0617

ECU starting motor control wire is short to high level.

Fault Description: ECU provides starting motor with grounding via so-called “drive” internal solid component in
order to control starting motor operation. Under starting motor control circuit command, when fault diagnostic
apparatus is connected, it is indicated that starting motor circuit is grounded via control module in order to provide
starting motor with voltage; when fault diagnostic apparatus is disconnected, it is indicated that starting motor circuit
is not connected via control module command currently. ECU monitors starting motor circuit 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 and corresponding drive will stop operating.

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.

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