Hyundai Excavator R210LC-7. Service and repair manual

6 - 45

TEST PROCEDURE

Test 5 :

Check resistance between CN-50
(12)-(23).

Starting key OFF.
Disconnect connector CN-50 from CPU
controller.
Check resistance as figure.

(1)

Test 6 :

Check tachometer(Work properly
or not)

Start engine.
Check tachometer reading.

(2)

CPU

CONTROLLER

CN-50

Y R G

CN-51

Multimeter

CN-50

Unit : rpm

Tier-I

(~#1000)

Tier-II

(#1001~)

Spec

Remark

2250 50

2150 50

2050 50

Check rpm after cancel

the Auto decel mode.

Check rpm after cancel

the Auto decel mode.

SPEC : 1~2

29076MS04

6 - 46

CD-17

Multimeter

CD-17

Speed sensor

Engine flywheel

SPEC : 0.2~0.4k

Test 8 :

Check resistance at speed
sensor.

Starting key OFF.
Disconnect connector CD-17 of speed
sensor at engine flywheel housing.
Check resistance as figure.

(4)

(210-7) 6-42(1)

Test 7 :

Check resistance between CN-51
(25) and CN-51(26).

Starting key OFF.
Disconnect connector CN-51 from CPU
controller.
Check resistance as figure.

(3)

CN-50

Y R G

Multimeter

CN-51

CPU

CONTROLLER

CN-51

SPEC : 0.2~0.4k

29076MS05

6 - 47

Wiring diagram

CN-75

CN-2

CS-7

EPPR VALVE

PROLIX SWITCH

RESISTOR

CN-47

CONTROLLER

CN-50

CN-51

FUSE

NO.9

Normal

Emergency :

3. ENGINE STALL(up to #0179)

Before carrying out below procedure, check all the related connectors are properly inserted.

INSPECTION PROCEDURE

YES

SPEC : 200~550mA
See TEST 9

SPEC:5~20kgf/cm

See TEST 10

SPEC : 17.5 1 (20 C)
See TEST 2

SPEC : 17.5 1 (20 C)
See TEST 1

Check electric
current at EPPR
valve

Check pressure
at EPPR Valve

Check resistance
between CN-50
(8) - (36)

Check resistance
at EPPR valve

Cause

Remedy

Not enough engine
power

Defective EPPR
valve

Defective CPU
controller

Short circuit or
poor connection
between
CN-50 - CN-2 or
CN-50 - CN-75

Defective EPPR
valve

Contact cummins
engine dealer

Replace

Check and repair

Replace

YES

29076MS01

6 - 47-1

Wiring diagram

3-1. ENGINE STALL(from #0180 to #1000)

Before carrying out below procedure, check all the related connectors are properly inserted.

INSPECTION PROCEDURE

YES

SPEC : 200~550mA
See TEST 3

SPEC:5~20kgf/cm

See TEST 4

SPEC : 17.5 1 (20 C)
See TEST 2

Check electric
current at EPPR
valve

Check pressure
at EPPR Valve

Cause

Remedy

Not enough engine
power

Defective EPPR
valve

Short circuit or
poor connection
between
CN-50 - CN-2 or
CN-50 - CN-75

Defective EPPR
valve

Contact cummins
engine dealer

Replace

Check and repair
wire harness

Replace

YES

Check resistance
at EPPR valve

21076MS51

6 - 48

TEST PROCEDURE

Test 9 :

Check electric current at EPPR
valve at S-mode

Install multimeter as figure.
Start engine.
Set the accel dial at "10"(max)
Set S-mode with 2150 50rpm.
Check electric current.

CN-75

Multimeter

EPPR VALVE

CN-75

Supply line, pilot press

Pressure adjusting
screw locknut

(1)

Test 10 :

Check pressure at EPPR valve
at S-mode

Connect pressure gauge at EPPR valve.
Start engine.
Set the accel dial at "10"(max)
Set S-mode with 2150 50rpm.
Operate bucket lever completely push or
pull.
Hold arm lever at the end of stroke.
Check pressure at relief position.

(2)

SPEC : 200~550mA

SPEC : 5~20kgf/cm

(70~280psi)

(210-7) 6-44(1)

(210-7) 6-44(2)

6 - 49

4. MALFUNCTION OF CLUSTER OR MODE SELECTION SYSTEM

Before carrying out below procedure, check all the related connectors are properly inserted.

INSPECTION PROCEDURE

See if

Co : Er

on the cluster

See if all lamps
off in the CPU
controller case

Check connection
between CN-51
(29) - CN-5(10) or
CN-51(30) - CN-
5(11)

Cause

Remedy

No power supply to
the CPU controller

CPU failure

Cluster failure

No connection

Check fuse

Replace

Check and repair

KEY OFF

Wiring diagram

YES

21076MS06

6 - 50

5. SLOW ACTION OF ENGINE SPEED CHANGE WHEN CHANGE THE MODE

Before carrying out below procedure, check all the related connectors are properly inserted.

INSPECTION PROCEDURE

YES

SPEC : (20)-(21) : 5 1V

(20)-(22) : 0.1~0.9k

See TEST 12

Check interference
between
connecting rod and
accel actuator

Check voltage
between CN-5(20)-
(21) and check
resistance between
CN-51(20)-(22)

SPEC : 1~2
See TEST 11

Check resistance
between CN-50
(12)-(23)

Cause

Remedy

Slow action of
engine speed
control due to
interference

Defective CPU
controller

Defective accel
actuator

Check and repair

Replace

CN-2

CN-76

CPU CONTROLLER

CN-50

CD-17

TACHO SENSOR

ACCEL ACTUATOR

P+

SIG

P-

M+

M-

CN-51

rpm

CN-9

CN-142

ACCEL DIAL

Wiring diagram

YES

29076MS03

6 - 51

TEST PROCEDURE

Test 11 :

Check resistance.

Starting key OFF.
Disconnect connector CN-50 from CPU
controller.
Check resistance between CN-50(12)-
(23) as figure.

CPU

CONTROLLER

CN-50

Y R G

CN-51

Multimeter

CN-50

(1)

SPEC : 1~2

29076MS04

6 - 52

CN-50

Y R G

Multimeter

CN-51

CPU

CONTROLLER

CN-51

Test 12 :

Check voltage and resistance.

Check resistance between CN-51(20)-
(22).

Starting key OFF.
Disconnect connector CN-51 from CPU
controller.
Check resistance value with multimeter
as figure.

(2)

Check voltage between CN-51(20) and
CN-51(21).

Prepare 2 pieces of thin sharp pin, steel
or copper.
Starting key ON.
Insert prepared pins to rear side of
connectors : One pin to CN-51(20)

Other pin to CN-51(21)

Check voltage.

SPEC : 0.1~0.9k

CN-50

Y R G

Multimeter

CN-51

CPU

CONTROLLER

CN-51

21 20

SPEC : 5 1V

29076MS08

29076MS09

6 - 53

6. AUTO DECEL SYSTEM DOES NOT WORK

Before carrying out below procedure, check all the related connectors are properly inserted.

INSPECTION PROCEDURE

Wiring diagram

Cause

Remedy

Defective CPU
controller

Short circuit or
poor connection
vetween CN-51(1),
(13)- pressure
switches

Defective auto
decel pressure
switch

Replace

Replace or repair

Replace

CPU CONTROLLER

CN-51

AUTO DECEL PRESSURE SWITCH

CD-7

CD-6

SPEC :

Actuator operating :

4~5V

Actuator stop :0~1V

See TEST 13
See TEST 14

Check resistance
between CN-51
(1)-GND and
CN-51(13)-GND

YES

29076MS10

6 - 54

TEST PROCEDURE

Test 13 :

Check voltage at CN-51(1) and
ground.

Prepare 1 piece of thin sharp pin, steel or
copper.
Starting key ON.
Insert prepared pin to rear side of
connectors : One pin to (1) of CN-51.
Check voltage as figure.

Test 14

: Check voltage at CN-51(13)and

ground.

Prepare 1 piece of thin sharp pin, steel or
copper
Starting key ON.
Insert prepared pin to rear side of
connectors : One pin to (13)of CN-51.
Check voltage as figure.

CN-50

Y R G

Multimeter

CN-51

CPU

CONTROLLER

CN-51

Ground

Multimeter

CN-51

Ground

(1)

(2)

SPEC : Actuator stop : 4~5V

Actuator operating : 0~1V

29076MS11

6 - 55

Wiring diagram

SPEC : Below 10
KEY OFF

SPEC : Below10
KEY OFF

Check resistance
between CN -51
(33) - CD-8(1)

Check resistance
between CN-51
(31) - CD-8(2)

Defective cluster or
CPU controller or
CD8(Sensor)

Poor connection
between CN-
51(31) - CD-8(1)

Poor connection
between CN-
51(33) - CD-8(2)

Repair or Replace

Repair

7. MALFUNCTION OF WARMING UP

Before carrying out below procedure, check all the related connectors are properly inserted.

INSPECTION PROCEDURE

Cause

Remedy

YES

21076ES53

6 - 56

Wiring diagram

SPEC
KEY ON : 24 1V
KEY OFF : 0V
See TEST 15

SPEC: 15-30
See TEST 15

SPEC : Power max button pressed ON : 0

Power max button released OFF :

See Test 16

Is voltage between
CN-88(2) -GND
normal?

Resistance
between CN-51
(2)-GND normal?

Check resistance
between CN-88
(1) - (2)

Defective power
max. solenoid valve

Short circuit or poor
connection
between CN-51(2) -
CS-29 and CN-50
(3) -CN-88(2)

Short circuit or poor
connection
between CN-88(1)-
battery relay(+)

Repair or replace

8. MALFUNCTION OF POWER MAX

Before carrying out below procedure, check all the related connectors are properly inserted.

INSPECTION PROCEDURE

POWER MAX SOLENOID

CS-29

CN-50

CPU CONTROLLER

CN-51

POWER MAX SWITCH

CN-88

CN-4

FUSE

NO.23

Cause

Remedy

YES

29076MS13

6 - 57

TEST PROCEDURE

Test 15:

Check voltage between connector
CN-88 - GND.

Start key ON.
Disconnect connector CN-88 from power
max solenoid valve.
Check voltage as figure.

(1)

Test 16:

Check resistance between

connector CN-51(2)-GND.

Starting key OFF.
Remove CPU controller and disconnect
connector CN-51 from CPU controller.
Check resistance as figure.

(2)

LH RCV-lever

Power max. switch

Power max.
solenoid valve

CN-88

Multimeter

CN-88

CN-50

Y R G

CPU

CONTROLLER

CN-51

Multimeter

CN-51

Ground

SPEC : Key ON : 24 1V

Key OFF : 0V
Resistance : 15~30

SPEC : Power max button pressed ON : 0

Power max button released OFF :

29076MS14

29076MS15

6 - 58

GROUP 5 MECHATRONICS SYSTEM (#1001 and up, TIER II)

Wiring diagram

1. ALL ACTUATORS SPEED ARE SLOW

Boom, Arm, Bucket, Swing and travel speed are slow, but engine speed is good.
Spec : H-mode

2150

50rpm

S-mode

2050

50rpm

Before carrying out below procedure, check all the related connectors are properly inserted.

INSPECTION PROCEDURE

SPEC : 200~450mA
See TEST 3

SPEC : 5~20kgf/cm

See TEST 4

SPEC : 17.5 1 (20 C)
See TEST 2

Check if

Er : 03

on the cluster

Check electric
current at EPPR
valve

Check resistance
at EPPR valve

Check pressure
at EPPR valve

YES

Cause

Remedy

Defective
hydraulic system

Defective
EPPR valve

Defective CPU
controller

Short circuit or
poor connection
between CN-50 -
CN-75

Defective EPPR
valve

Replace

Check and repair
wire harness or
between CN-50-
CN-75

Replace

21076MS51

6 - 59

CN-75

Multimeter

CN-75

Multimeter

EPPR VALVE

Test 2 :

Check resistance at connector
CN-75.

Starting key OFF.
Disconnect connector CN-75 from EPPR
valve at main hydraulic pump.
Check resistance between 2 lines as
figure.

(1)

Test 3 :

Check electric current at EPPR
valve.

Install multimeter as figure.
Start engine.
Set the accel dial at "10"(MAX)
Set S-mode and cancel auto decel mode.
If tachometer show approx 2050 50rpm
check electric current.

(2)

SPEC : 17.5 1 (20 C)

SPEC : 200~450mA(S mode)

CN-75

Supply line, pilot press

Pressure adjusting
screw locknut

SPEC : 5~20kgf/cm

(70~280psi)

Test 4 :

Check pressure at EPPR valve.

Remove plug and connect pressure
gauge as figure.

Gauge capacity : 0 to 40~50kgf/cm

(0 to 570~710psi)

Start engine.
Set the accel dial at "10"(Max).
Set S-mode and cancel auto decel mode.
If tachometer show approx 2050 50rpm
check pressure.
If pressure is not correct, adjust it.
After adjust, test the machine.

(3)

(290-7) 6-38(2)

(290-7) 6-38(3)

(290-7) 6-39(1)

Hyundai Excavator R210LC-7. Service and repair manual - page 22