Page 1705 of 3051
MODELS WITH ECM IN CABINNLEC0767S02
YEC866
EGR VOLUME CONTROL SYSTEMYD22DDTI
Wiring Diagram (Cont'd)
EC-1280
Page 1706 of 3051
Diagnostic ProcedureNLEC0768
1 CHECK EGR VOLUME CONTROL SYSTEM OVERALL FUNCTION
1. Turn ignition switch ªOFFº.
2. Set the oscilloscope probe between ECM terminals 337, 338, 350, 351 and ground.
3. Start engine and let it idle.
4. Check the oscilloscope screen when revving engine up to 3,200 rpm and return to idle.
SEF247Z
OK or NG
OK©INSPECTION END
NG©GO TO 2.
2 CHECK EGR VOLUME CONTROL VALVE POWER SUPPLY CIRCUIT-I
1. Turn ignition switch ªOFFº.
2. Disconnect EGR volume control valve harness connector.
SEF388Y
3. Turn ignition switch ªONº.
4. Check voltage between EGR volume control valve terminals 2, 5 and ground with CONSULT-II or tester.
SEF412Y
OK or NG
OK©GO TO 7.
NG©GO TO 3.
EGR VOLUME CONTROL SYSTEMYD22DDTI
Diagnostic Procedure
EC-1281
Page 1707 of 3051

3 CHECK EGR VOLUME CONTROL VALVE POWER SUPPLY CIRCUIT-II
1. Turn ignition switch ªOFFº.
2. Disconnect ECM relay. (For ECM relay location, refer to ªEngine control component parts locationº, EC-1071.)
3. Check harness continuity between ECM relay terminal 5 and EGR volume control valve terminals 2 and 5. Refer to
Wiring Diagram.
Continuity should exist.
OK or NG
OK©GO TO 4.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
4 CHECK EGR VOLUME CONTROL VALVE POWER SUPPLY CIRCUIT-III
Check voltage between ECM relay terminal 3 and ground with CONSULT-II or tester.
SEF413Y
OK or NG
OK©GO TO 6.
NG©GO TO 5.
5 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors E76, F13
+10A fuse
+Harness for open or short between ECM relay and battery
©Repair open circuit or short to ground or short to power in harness or connectors.
6 CHECK ECM RELAY
1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between ECM relay terminals 3 and 5, 6 and 7.
SEF296X
OK or NG
OK©GO TO 7.
NG©Replace ECM relay.
EGR VOLUME CONTROL SYSTEMYD22DDTI
Diagnostic Procedure (Cont'd)
EC-1282
Page 1708 of 3051
7 CHECK EGR VOLUME CONTROL VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals and EGR volume control valve terminals as follows.
Refer to Wiring Diagram.
MTBL0463
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 8.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
8 CHECK EGR VOLUME CONTROL VALVE-I
Check resistance between EGR volume control valve terminal 2 and terminals 1, 3, terminal 5 and terminals 4, 6.
SEF414Y
OK or NG
OK (With CONSULT-II)©GO TO 9.
OK (Without CONSULT-
II)©GO TO 10.
NG©Replace EGR volume control valve.
EGR VOLUME CONTROL SYSTEMYD22DDTI
Diagnostic Procedure (Cont'd)
EC-1283
Page 1709 of 3051

9 CHECK EGR VOLUME CONTROL VALVE-II
With CONSULT-II
1. Remove EGR volume control valve.
2. Reconnect ECM harness connector and EGR volume control valve harness connector.
3. Turn ignition switch ªONº.
4. Perform ªEGR VOL CONT/Vº in ªACTIVE TESTº mode with CONSULT-II.
5. Check that EGR volume control valve shaft moves smoothy forward and backward according to the valve opening
steps.
SEF819Y
OK or NG
OK©GO TO 11.
NG©Replace EGR volume control valve.
10 CHECK EGR VOLUME CONTROL VALVE-II
Without CONSULT-II
1. Remove EGR volume control valve.
2. Reconnect ECM harness connector and EGR volume control valve harness connector.
3. Turn ignition switch ªONº and ªOFFº.
4. Check that EGR volume control valve shaft moves smoothly forward and backward according to the ignition switch
position.
SEF560W
OK or NG
OK©GO TO 11.
NG©Replace EGR volume control valve.
11 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-1135.
©INSPECTION END
EGR VOLUME CONTROL SYSTEMYD22DDTI
Diagnostic Procedure (Cont'd)
EC-1284
Page 1710 of 3051

DescriptionNLEC1266SYSTEM DESCRIPTIONNLEC1266S01
Sensor Input Signal to ECMECM Func-
tionActuator
Ignition switch Start signal
Swirl con-
trol valve
controlSwirl control valve control solenoid
valve
¯Vacuum signal
Swirl control valve actuator
¯
Swirl control valve Crankshaft position sensor (TDC) Engine speed
Engine coolant temperature sensor Engine coolant temperature
This system has a swirl control valve in the intake manifold.
Under normal driving conditions, the swirl control valve closes,
generating a strong swirl in the combustion chamber. This pro-
motes the mixing of fuel and air for stable combustion.
Under high-load conditions, the swirl control valve opens. By
obtaining a volume of air for an increase in fuel, combustion that
does not easily emit black smoke is achieved.
The solenoid valve controls swirl control valve's shut/open condi-
tion. This solenoid valve is operated by the ECM.
Engine speed Engine coolant temperatureSwirl control valve control sole-
noid valveSwirl control valve
Less than 2,400 rpm*Less than 20ÉC (68ÉF) OFF Open
More than 20ÉC (68ÉF) ON Closed
More than 2,400 rpmLess than 20ÉC (68ÉF) OFF Open
More than 20ÉC (68ÉF) OFF Open
*: Except in idle condition and high-load condition
SEF872Z
SEF876Z
COMPONENT DESCRIPTIONNLEC1266S02Swirl Control Valve Control Solenoid ValveNLEC1266S0201The swirl control valve control solenoid valve responds to signals
from the ECM. When the ECM sends an ON (ground) signal, the
solenoid valve is bypassed to apply vacuum pump vacuum to the
swirl control valve actuator. This operation closes the swirl control
valve. When the ECM sends an OFF signal, the vacuum signal is
cut and the swirl control valve opens.
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEYD22DDTI
Description
EC-1285
Page 1711 of 3051
CONSULT-II Reference Value in Data Monitor
Mode
NLEC1267Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
SWRL CONT S/V+Engine: After warming up
+No-loadEngine speed: 1,500 rpm ON
Engine speed: Idle OFF
ECM Terminals and Reference ValueNLEC1268Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may damage the
ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.WIRE
COLORITEM CONDITIOND ATA
(DC Voltage)
209 G/WSwirl control valve control
solenoid valve[Engine is running.]
+Warm-up condition
+Engine speed: 1,500 rpm
+No loadApproximately 0.1V
[Engine is running.]
+Idle speedBATTERY VOLTAGE
(11 - 14V)
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEYD22DDTI
CONSULT-II Reference Value in Data Monitor Mode
EC-1286
Page 1712 of 3051
Wiring DiagramNLEC1269MODELS WITH ECM IN ENGINE COMPARTMENTNLEC1269S01
YEC737
SWIRL CONTROL VALVE CONTROL SOLENOID VALVEYD22DDTI
Wiring Diagram
EC-1287