Page 1697 of 3051
4 CHECK GLOW INDICATOR LAMP OPERATION
Without CONSULT-II
1. Turn ignition switch ªONº.
2. Confirm that the voltage between ECM terminal 347 (Engine coolant temperature sensor signal) and ground is above
1.36V. If it is below 1.36V, cool down engine.
SEF442Z
3. Turn ignition switch ªOFFº, wait at least 5 seconds and then turn ªONº.
4. Make sure that glow indicator lamp is turned ªONº for 1.5 seconds or more after turning ignition switch ªONº, and then
turned ªOFFº.
OK or NG
OK©GO TO 5.
NG©GO TO 6.
5 CHECK GLOW CONTROL SYSTEM OVERALL FUNCTION
1. Turn ignition switch ªOFFº.
2. Set voltmeter probe between glow plug and engine body.
3. Turn ignition switch ªONº.
4. Check the voltage between glow plug and engine body under the following conditions.
SEF431Y
OK or NG
OK©INSPECTION END
NG©GO TO 11.
GLOW CONTROL SYSTEMYD22DDTI
Diagnostic Procedure (Cont'd)
EC-1272
Page 1698 of 3051
6 CHEC KGLO WINDIC ATO R LAM PPOWE RSUPP LY CIRCUIT
SEF744Z
7 DETEC TMALFUNCTIONIN GPART
8 CHEC KGLO WINDIC ATO R LAM POUTPU TSIGNA LCIRCUI TFO ROPE NAN DSHORT
9 DETEC TMALFUNCTIONIN GPART
10 CHEC KCOMBIN ATIO NMETER
Diagnostic Procedure (Cont'd)
Page 1699 of 3051

11 CHECK GLOW RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect glow relay.
SEF752Z
3. Check voltage between glow relay terminals 1, 5 and ground with CONSULT-II or tester.
SEF420Y
OK or NG
OK©GO TO 13.
NG©GO TO 12.
12 DETECT MALFUNCTIONING PART
Check the following.
+60A fusible link
+Harness for open or short between glow relay and battery
©Repair harness or connectors.
13 CHECK GLOW RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 214 and glow relay terminal 2. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 15.
NG©GO TO 14.
14 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors E75, F14 (where fitted)
+Harness connectors M76, F13 (where fitted)
+Harness for open or short between glow relay and ECM
©Repair open circuit or short to ground or short to power in harness or connectors.
GLOW CONTROL SYSTEMYD22DDTI
Diagnostic Procedure (Cont'd)
EC-1274
Page 1700 of 3051

15 CHECK HARNESS CONTINUITY BETWEEN GLOW RELAY AND GLOW PLUG FOR OPEN AND SHORT
1. Disconnect glow plug harness connector.
2. Check harness continuity between glow relay terminal 3 and glow plug harness connector. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 16.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
16 CHECK GLOW RELAY
Check continuity between glow relay terminals 3 and 5 under the following conditions.
SEF433Y
OK or NG
OK©GO TO 17.
NG©Replace glow relay.
17 CHECK GLOW PLUG
1. Remove glow plug connecting plate.
2. Check glow plug resistance.
SEF434Y
NOTE:
+Do not bump glow plug heating element. If it is bumped, replace glow plug with a new one.
+If glow plug is dropped from a height of 10 cm (3.94 in) or higher, replace with a new one.
+If glow plug installation hole is contaminated with carbon, remove it with a reamer or suitable tool.
+Hand-tighten glow plug by turning it two or three times, then tighten using a tool to specified torque.
: 17.7 - 22.5 N´m (1.8 - 2.3 kg-m, 13 - 16 ft-lb)
OK or NG
OK©GO TO 18.
NG©Replace glow plug.
GLOW CONTROL SYSTEMYD22DDTI
Diagnostic Procedure (Cont'd)
EC-1275
Page 1701 of 3051
18 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-1135.
©INSPECTION END
GLOW CONTROL SYSTEMYD22DDTI
Diagnostic Procedure (Cont'd)
EC-1276
Page 1702 of 3051

DescriptionNLEC0764SYSTEM DESCRIPTIONNLEC0764S01
Sensor Input Signal to ECM ECM Function Actuator
Electronic controlled fuel injection pump Fuel injection signal
EGR volume con-
trolEGR volume control
valve Crankshaft position sensor (TDC) Engine speed
Vehicle speed sensor Vehicle speed
Engine coolant temperature sensor Engine coolant temperature
Ignition switch Start signal
Accelerator position sensor Accelerator position
Mass air flow sensor Amount of intake air
Air conditioner switch Air conditioner operation
Electrical load Electrical load signal
This system controls flow rate of EGR led from exhaust manifold
to intake manifold. The opening of the EGR by-pass passage in the
EGR volume control valve changes to control the flow rate. A
built-in step motor moves the valve in steps corresponding to the
ECM output pulses. The opening of the valve varies for optimum
engine control. The optimum value stored in the ECM is determined
by considering various engine conditions.
The EGR volume control valve remains close under the following
conditions.
+Engine stopped
+Engine starting
+Low engine coolant temperature
+Excessively high engine coolant temperature
+High engine speed
+Wide open throttle
SEF908Y
SEF411Y
COMPONENT DESCRIPTIONNLEC0764S02EGR Volume Control ValveNLEC0764S0201The EGR volume control valve uses a step motor to control the flow
rate of EGR from exhaust manifold. This motor has four winding
phases. It operates according to the output pulse signal of the
ECM. Two windings are turned ON and OFF in sequence. Each
time an ON pulse is issued, the valve opens or closes, changing
the flow rate. When no change in the flow rate is needed, the ECM
does not issue the pulse signal. A certain voltage signal is issued
so that the valve remains at that particular opening.
EGR VOLUME CONTROL SYSTEMYD22DDTI
Description
EC-1277
Page 1703 of 3051

CONSULT-II Reference Value in Data Monitor
Mode
NLEC0765Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
EGR VOL CON/V+Engine: After warming up
+Air conditioner switch: ªOFFº
+Shift lever: Neutral position
+No-loadAfter one minute at idle More than 10 step
Revving engine up to 3,200 rpm 0 step
ECM Terminals and Reference ValueNLEC0766Specification 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 result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA(DC Voltage)
337
338
350
351W/L
PU/W
GY
OR/BEGR volume control valve[Engine is running]
+Warm-up condition
+Idle speed0.1 - 14V
(Voltage signals of each
ECM terminals differ
according to the control
position of EGR volume
control valve.)
EGR VOLUME CONTROL SYSTEMYD22DDTI
CONSULT-II Reference Value in Data Monitor Mode
EC-1278
Page 1704 of 3051
Wiring Diagram=NLEC0767MODELS WITH ECM IN ENGINE COMPARTMENTNLEC0767S01
YEC732
EGR VOLUME CONTROL SYSTEMYD22DDTI
Wiring Diagram
EC-1279