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Hyundai Excavator R450LC-7. Service and repair manual - page 16

5-11

GROUP 8 ANTI-RESTART SYSTEM

1. ANTI-RESTART FUNCTION

After 10 seconds from the engine starts to run, CPU controller turns off the start safety relay to protect
the starter from inadvertent restarting.

2. When a replacement or taking-off of the CPU controller is needed, connect CN-92a and CN-92b to

ensure the engine start without the CPU controller.

5-13

5. ERROR CODES TABLE

Error code No.

Description

Short circuit in accel actuator system

Potentiometer circuit is shorted to Vcc(5V) or battery +

Short circuit in pump EPPR valve system

Short circuit in boom down EPPR valve system

Short circuit in travel speed solenoid system

Short circuit in power boost solenoid system

Short circuit in max flow solenoid system

Short circuit in hour-meter system

Accel dial circuit is shorted to Vcc(5V) or battery +

P1 pressure sensor circuit is shorted to power supply(24V) line

P2 pressure sensor circuit is shorted to power supply(24V) line

P3 pressure sensor circuit is shorted to power supply(24) line

Boom down pressure circuit is shorted to power supply(24V) line

Accel actuator circuit is open or shorted to ground

Potentiometer circuit is open or shorted to ground

Pump EPPR valve circuit is open or shorted to ground

Boom down EPPR valve circuit is open or shorted to ground

Travel speed solenoid circuit is open or shorted to ground

Power boost solenoid circuit is open or shorted to ground

Max flow solenoid circuit is open or shorted to ground

Hour-meter circuit is open or shorted to ground

Accel dial circuit is open or shorted to ground

P1 pressure sensor circuit is open or shorted to ground

P2 pressure sensor circuit is open or shorted to ground

P3 pressure sensor circuit is open or shorted to ground

Boom down pressure sensor circuit is open or shorted to ground

Engine preheater circuit is open or shorted to ground

Travel alarm buzzer circuit is open or shorted to ground

Alternator circuit is open or shorted to ground

Controller input voltage is below 18V

Controller input voltage is over 38V

Communication error with cluster

Engine speed sensor circuit is open or shorted to ground

Anti-restart relay circuit is open or shorted to ground

Accel actuator does not stop at a target position

There is more than 500rpm difference between target speed and actual speed

5-14

Error code No.

Description

Hydraulic oil temperature sensor circuit is shorted to ground

Fuel level sensor circuit is shorted to ground

Coolant temperature sensor circuit is shorted to ground

Boom up pressure sensor circuit is shorted to power supply(24V) line

Hydraulic oil temperature sensor circuit is open or shorted to battery +

Fuel level sensor circuit is open or shorted to battery +

Coolant temperature sensor circuit is open or shorted to battery +

Boom up pressure sensor circuit is open or shorted to ground

Engine preheater circuit is shorted to battery +

Boom priority solenoid circuit is open or shorted to ground

Travel alarm buzzer circuit is shorted to battery +

Boom priority solenoid circuit is shorted to battery +

5-15

Fault code No.

Reason

Effect(only when fault code is active)

Error internal to the ECM related to memory
hardware failures or internal ECM voltage
supply circuits.

No engine speed signal detected at both
engine position sensor circuits.

No engine speed signal detected from one of
the engine position sensor circuits.

High voltage detected on the intake manifold
pressure circuit.

Low voltage detected on the intake manifold
pressure circuit.

High voltage detected at the throttle position
signal circuit.

Low voltage detected at the throttle position
signal circuit.

High voltage detected at the remote throttle
position signal circuit.

Low voltage detected at the remote throttle
position signal circuit.

High voltage detected at the oil pressure
circuit.

Low voltage detected at the oil pressure
circuit.

Oil pressure signal indicates oil pressure
below the low oil pressure engine protection
limit.

High voltage detected at the coolant
temperature circuit.

Low voltage detected at the coolant
temperature circuit.

A frequency of less then 100Hz was detected
at the frequency throttle signal pin of the
actuator harness connector at the ECM.

A frequency of more than 100Hz was detected
at the frequency throttle signal pin of the
actuator harness connector at the ECM.

Coolant temperature signal indicates coolant
temperature above 104

。

C(220

。

F).

High voltage detected at the intake manifold
temperature circuit.

Low voltage detected at the intake manifold
temperature circuit.

Intake manifold temperature signal indicates
temperature above 87.8

。

C(190

。

F).

Low voltage detected on the ECM voltage
supply line to some sensors(VSEN2 supply).

Engine will not start.

Engine will die and will not start.

None on performance.

Derate in power output of the engine.

Severe derate(power and speed). Limp home
power only.

None on performance if remote throttle is not
used.

No engine protection for oil pressure.

Progressive power and speed derate with
increasing time after alert. If engine protection
shutdown feature is enable, engine will shut
down 30 seconds after red lamp starts
flashing.

Possible white smoke. Fan will stay on if
controlled by the electronic control module
(ECM). No engine protection for coolant
temperature.

Possible white smoke. Fan will stay on if
controlled by electronic control module (ECM).
No engine protection for coolant temperature.

Calibration dependent power and speed
derate.

Progressive power derate with increasing time
after alert. If engine protection shutdown
feature is enabled, engine will shut down 30
seconds after red lamp starts flashing.

Possible white smoke. Fan will stay on if
controlled by electronic control module (ECM).
No engine protection for coolant temperature.

Progressive power derate with increasing time
after alert. If engine protection shutdown
feature is enabled, engine will shut down 30
seconds after red lamp starts flashing.

Engine will run derated. No engine protection
for oil pressure and coolant level.

111

115

121

122

123

131

132

133

134

135

141

143

144

145

147

148

151

153

154

155

187

. ENGINE FAULT CODE INFORMATION (For QSM11)

5-16

Fault code No.

Reason

Effect(only when fault code is active)

Additional machine diagnostic codes have
been logged. Check other ECM’s for
diagnostic codes.

High voltage detected at the oil temperature
circuit.

Low voltage detected at the oil temperature
circuit.

Oil temperature signal indicates oil temperate
above 123.9

。

C(225

。

F).

Low oil level was detected in the Centinel

makeup oil tank.

High voltage detected at the ambient air
pressure circuit.

Low voltage detected at the ambient air
pressure circuit.

Incorrect voltage detected at the Centinal

actuator circuit by the ECM.

High voltage detected on the ECM voltage
supply line to some sensors(VSEN2 supply).

Engine speed signal indicates engine speed is
greater than 2730 rpm.

Coolant level signal indicates coolant level is
below the normal range.

Duty cycle of the throttle input signal to the
primary or secondary engine for multiple unit
synchronization is less than 3 percent or more
than 97 percent.

The ECM lost the vehicle speed signal.

Invalid or inappropriate vehicle speed signal
detected. Signal indicates an intermittent
connection or VSS tampering.

Less than 6 VDC detected at fan clutch circuit
when on. Indicates an excessive current draw
from the ECM or faulty ECM output circuit.

Less than 6 VDC detected at FSO circuit when
on. Indicates an excessive current draw from
the ECM or a faulty ECM output circuit.

Externally supplied voltage detected going to
the fuel shutoff solenoid supply circuit.

The ECM expected information from a
multiplexed device but did not receive it soon
enough or did not receive it at all.

The ECM expected info from a multiplexed
device but only received a portion of the
necessary information.

The machine vehicle electronic control unit
(VECU) detected a fault with its throttle pedal.

None on engine performance.

No engine protection for oil temperature.

Progressive power derate with increasing time
after alert. If engine protection shutdown
feature is enabled, engine will shut down
30sec after the red lamp starts flashing.

None on performance. Centinel

deactivated.

Derate in power output of the engine.

None on performance. Centinel

deactivated.

Engine will run derated. No engine protection
for oil pressure and coolant level.

Fuel shutoff valve closes until engine speed
falls to 2184 rpm.

Progressive power derate with increasing time
after alert. If engine protection shutdown
feature is enabled, engine will shut down 30
seconds after red lamp starts flashing.

All engines(primary and secondary) are shut
down with increasing time after alert if hard-
coupled. Only secondary engines are shut
down with increasing time after alert if soft-
coupled.

Engine speed limited to maximum engine
speed without vehicle speed sensor parameter
value Cruise Control. Gear-Down Protection
and Road Speed Governor will not work
(automotive only).

The fan may stay on at all times.

The ECM turns off the FSO supply voltage.
The engine will shut down.

None on performance. Fuel shutoff valve
stays open.

At least one multiplexed device will not operate
properly.

At least on multiplexed device will not operate
properly.

The engine will only idle.

211

212

213

214

219

221

222

223

227

234

235

237

241

242

245

254

255

285

286

287

5-17

Fault code No.

Reason

Effect(only when fault code is active)

The machine vehicle electronic control unit
(VECU) detected a fault with its remote throttle.

High voltage detected at the machine
temperature sensor signal pin of the 31-pin
machine connector.

Low voltage detected at the machine
temperature sensor signal pin of the 31-pin
machine connector.

An error in the ambient air pressure sensor
signal was detected by the ECM.

High voltage detected at the machine pressure
sensor signal pin of the 31-pin machine
connector.

Low voltage detected at the machine pressure
sensor signal pin of the 31-pin machine
connector.

Engine shutdown by device other than key
switch before proper engine cool down
resulting in filtered load factor above maximum
shutdown threshold.

Current detected at No.1 injector when voltage
is turned off.

Current detected at No.5 injector when voltage
is turned off.

Current detected at No.3 injector when the
voltage is turned off

Current detected at No 6 injector when the
voltage is turned off.

Current detected at No.2 injector when the
voltage is turned off.

Real time clock lost power.

Current detected at No.4 injector when the
voltage is turned on.

No current detected at No.1 injector when the
voltage is turned on.

No current detected at No.5 injector when the
voltage is turned on.

No current detected at No.3 injector when the
voltage is turned on.

No current detected at No.6 injector when the
voltage is turned on.

No current detected at No.2 injector when the
voltage is turned on.

No current detected at No.4 injector when the
voltage is turned on.

Severe loss of data from the ECM.

Internal ECM error.

A frequency greater than calibrated threshold
was detected at the tail shaft governor signal
pin of the 31-pin machine connector.

Low voltage detected on the ECM voltage
supply line to some sensors (VSEN 1 supply).

The engine will not respond to the remote
throttle.

No engine protection for machine temperature.

Engine is derated to no air setting.

No engine protection for machine pressure.

No action taken by the ECM.

Current to injector is shut off.

None on performance. Data in the ECM will
not have accurate time and date information.

Current to injector is shut off.

Possible no noticeable performance effects
OR engine dying OR hard starting. Fault
information, trip information and maintenance
monitor data may be inaccurate.

Possible none on performance or severe
derate.

Calibration dependent power and speed
derate.

Engine is derated to no air setting.

288

293

294

295

297

298

299

311

312

313

314

315

319

321

322

323

324

325

331

332

341

343

349

352

5-18

Fault code No.

Reason

Effect(only when fault code is active)

High voltage detected on the ECM voltage
supply line to some sensors (VSEN 1 supply).

High voltage detected on the ECM voltage
supply line to the throttle(VTP supply).

Oil pressure signal indicates oil pressure
below the very low oil pressure engine
protection limit.

Water has been detected in the fuel filter.

An error in the intake manifold pressure
sensor signal was detected by the ECM.

Voltage detected simultaneously on both the
coolant level high and low signal circuits OR
no voltage detected on both circuits.

Communication between the ECM and the
J1939 data link has been lost.

High voltage detected at water-in-fuel sensor.

Low voltage detected at water-in-fuel sensor.

Voltage detected simultaneously on both the
idle validation off-idle and on-idle circuits.

Voltage detected at idle validation on-idle
circuit when voltage at throttle position circuit
indicates the pedal is not at idle OR voltage
detected at idle validation off-idle circuit when
voltage at throttle position circuit indicates the
pedal is at idle.

Voltage signal at intake manifold pressure
circuit indicates high intake manifold pressure
but other engine characteristics indicate intake
manifold pressure must be low.

Supply voltage to the ECM fell below 6.2 VDC
for a fraction of a second OR the ECM was not
allowed to power down correctly (retain battery
voltage for 30 seconds after key off).

An error in the oil pressure sensor signal was
detected by the ECM.

Battery voltage below normal operating level.

Low voltage detected on the ECM voltage
supply line to the throttle(s) (VTP supply).

Auxiliary speed frequency on input pin
indicated that the frequency is below a
calibration dependent threshold.

Less than 17.0 VDC detected at the dual
output A signal pin of the 31-pin machine
connector.

Less than 17.0 VDC detected at the dual
output B signal pin of the 31-pin machine
connector.

Less than 17.0 VDC detected at the dual
output B signal pin at the ECM.

No voltage detected simultaneously on both
the idle validation off-idle and on-idle circuits.

High voltage detected at the fuel inlet
restriction sensor signal pin.

Engine is derated to no air setting.

Engine will only idle.

Progressive power derate with increasing time
from alert. If engine protection shutdown
feature is enabled, engine will shut down 30
seconds after red lamp starts flashing.

Possible white smoke, loss of power, or hard
starting.

Engine is derated to no air setting.

No engine protection for coolant level.

None on performance. J1939 devices may
not operate.

None on performance.

Engine will only idle.

Derate to no air setting.

Possible no noticeable performance effects
OR possibility of engine dying OR hard
starting. Fault information, trip information and
maintenance monitor data may be inaccurate.

None on performance. No engine protection
for oil pressure.

Possible no noticeable performance effects
OR possibility of rough idle.

None on performance.

Engine will only idle.

No action taken by the ECM.

Engine will only idle.

Fuel inlet restriction monitor deactivated.

386

387

415

418

419

422

426

428

429

431

432

433

434

435

441

442

443

489

527

528

529

551

581

5-19

Fault code No.

Reason

Effect(only when fault code is active)

Low voltage detected at the fuel inlet restriction
sensor signal pin

Restriction has been detected at the fuel pump
inlet.

High battery voltage detected by the battery
voltage monitor feature.

ICON

has restarted the engine three times

within three hours due to low battery voltage
(automotive only) OR low battery voltage
detected by the battery voltage monitor
feature.

Very low battery voltage detected by the
battery voltage monitor feature.

Engine shutdown by operator before proper
engine cool down resulting in filtered load
factor above maximum shutdown threshold.

A power imbalance between cylinders was
detected by the ECM.

Fuel inlet restriction monitor deactivated.

Fuel inlet restriction monitor warning is set.

Yellow lamp will be lit until high battery voltage
condition is corrected.

Yellow lamp will be lit until low battery voltage
condition is corrected. The ECM may
increase idle speed and deactivate idle
decrement switch if idle speedup is enabled.
The engine will run continuously if ICON

active (automotive only).

Red lamp lit until very low battery voltage
condition is corrected.

No action taken by the ECM.

Engine may have rough idle or misfire.

582

583

596

597

598

611

951

5-20

1. CPU CONTROLLER AND ECM(Electronic control unit)

GROUP 10 ENGINE CONTROL SYSTEM

2. CPU CONTROLLER ASSEMBLY

Remove four pieces of bolt(3) of electric box(2).

Disconnect 2 connectors from CPU controller.

Remove 6 pieces of screw and open the cover of CPU controller.

Inspection : Check PCB(Printed Circuit Board)

If any damage is found, replace CPU controller assembly.

If not, but CAPO system does not work please report it to HHI dealer or A/S department.

(1)

(2)

CPU controller

Electric box

Bolt(M8)

45075MS06

5-21

3. EXCHANGE METHOD OF THE ROM

Disassemble the ash tray(2).

Disassemble the wiper motor cover(3).

Disassemble the cluster(1).

Loosen the screws(6EA) located back of
the cluster.

Then you can open the upper case of the
cluster easily.

Install the new ROM.(Be careful of direction
and assmelbe the cluster in the reverse
order to removal).

Same
direction

21075MS12

21075MS13

21075MS15

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