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.