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