Page 409 of 2267
YEC811
CRANKSHAFT POSI-
TION SENSOR (TDC)
: Detectable line for DTC
: Non-detectable line for DTC
ECM
TROUBLE DIAGNOSIS 13CD20E
Crankshaft Position Sensor (TDC) (Cont'd)
EC-115
Page 410 of 2267

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect crankshaft position sen-
sor (TDC) and ECM harness con-
nectors.
3. Check continuity between ECM ter-
minal
344and crankshaft position
sensor (TDC) connector terminal
p3.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Repair harness or con-
nectors.
Loosen and retighten engine ground
screws.
OK
CHECK GROUND CIRCUIT.
Check harness continuity between
crankshaft position sensor (TDC) con-
nector terminal
p2and ECM connec-
tor terminal
331.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or con-
nectors.
CHECK COMPONENT
[Crankshaft position sensor (TDC)].
Refer to ªCOMPONENT INSPECTIONº
on next page.
OK
ENG
Replace crankshaft posi-
tion sensor (TDC).
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
SEF617S Crankshaft position
sensor (TDC)
harness connector
NEF213A
Crankshaft position
harness connector
NEF214A
Crankshaft position
sensor connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSIS 13CD20E
Crankshaft Position Sensor (TDC) (Cont'd)
EC-116
Page 411 of 2267
COMPONENT INSPECTION
Crankshaft position sensor (TDC)
1. Disconnect crankshaft position sensor (TDC) harness con-
nector.
2. Loosen the fixing bolt of the sensor.
3. Remove the sensor.
4. Visually check the sensor for chipping.
5. Check resistance between crankshaft position sensor (TDC)
terminals
p2andp3.
Resistance: Approximately 1.2 - 1.5kW
[at 25ÉC (77ÉF)]
If NG, replace crankshaft position sensor (TDC).
SEF620S
NEF440 Crankshaft position
sensor (TDC) con-
nector
TROUBLE DIAGNOSIS 13CD20E
Crankshaft Position Sensor (TDC) (Cont'd)
EC-117
Page 412 of 2267

Glow Control System
When coolant temperature is lower than 75ÉC (167ÉF):
lIgnition switch ON
After ignition switch has been turned to ON, the glow relay
turns ON for a period of time depending on engine coolant
temperature, allowing current to flow through the glow plugs.
lStarting
After starting the engine, current will flow through the glow
plugs for 300 seconds, or until the coolant temperature
exceeds 50ÉC (122ÉF).
COMPONENT DESCRIPTION
Glow plug
The glow plug is provided with a ceramic heating element to
obtain a high-temperature resistance. It glows in response to a
signal sent from the ECM, allowing current to flow through the
glow plug via the glow relay.
Malfunction is detected when ....Check Items
(Possible cause)
lGlow relay signal circuit is open or shorted.lHarness or connectors
(The glow relay signal circuit is open or shorted)
lGlow relay
lGlow indicator lamp circuit is open or shorted.lHarness or connectors
(The glow indicator lamp circuit is open or shorted.)
lGlow lamp
Glow lamp indicator
Time,[S]
.
Engine coolant temperature
Pre-glow
Time,[S]
Engine coolant temperature.
Post glow
.Time,[S]
Engine coolant temperature
.1.5
.(-40) (-4) (32) (68) (104) (140)
.(-40) (-4) (32) (68) (104) (140)
.(-40) (-4) (32) (68) (104) (140),ÉC (ÉF).,ÉC (ÉF)
.,ÉC (ÉF)
NEF834
.
.
SEF857S Ceramic heater
Resistor
TROUBLE DIAGNOSES 14CD20T
EC-118
Page 413 of 2267
DIAGNOSTIC TROUBLE CONFIRMATION
PROCEDURE
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 5 seconds.
TROUBLE DIAGNOSES 14CD20T
Glow Control System (Cont'd)
EC-119
Page 414 of 2267
YEC102A
TROUBLE DIAGNOSES 14CD20T
Glow Control System (Cont'd)
EC-120
Page 415 of 2267

DIAGNOSTIC PROCEDURE
INSPECTION START
(Glow relay signal circuit)
CHECK MAIN POWER SUPPLY.
Check power supply to ECCS-D relay.
Refer to ªTROUBLE DIAGNOSIS FOR
POWER SUPPLYº (EC-CD-59).
CHECK POWER SUPPLY.
1. Turn ignition switch to the ªLOCKº
position.
2. Disconnect glow relay.
3. Turn ignition switch to the ªONº posi-
tion.
4. Check voltage between glow relay
connector terminals
p1,p5and
ground with tester.
Voltage: Battery voltage
OK
ENG
Check the following:
l15A fuse
l80A fusible link
lHarness continuity
between glow relay
and fuse.
If NG, replace fuse or
fusible link or repair har-
ness or connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch to the ªLOCKº
position.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM connector terminal
214and
glow relay connector terminal
p2.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check harness connec-
tors
F96,E89
Repair harness or con-
nectors.
CHECK GLOW PLUG AND GLOW
RELAY.
Refer to ªCOMPONENT INSPECTIONº
(EC-CD-124, 125).
OK
ENG
Replace glow plug or
glow relay.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
NEF835 Glow relay
Glow relay
harness connector
YEC370
Glow relay con-
nector
NEF215A
Glow relay
connector
H
H
H
H
H
H
H
TROUBLE DIAGNOSES 14CD20T
Glow Control System (Cont'd)
EC-121
Page 416 of 2267

INSPECTION START
(Glow indicator lamp circuit)
CHECK POWER SUPPLY CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect combination meter har-
ness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between combination
meter harness connector terminal
p5orp1and body ground.
Voltage: Battery voltage
OK
ENG
Check the following:
lHarness for open or
short-circuit between
combination meter and
battery.
l10A fuse
If NG, replace fuse or
repair harness or con-
nectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to ªLOCKº posi-
tion.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM connector terminal
221and
combination meter connector termi-
nal
p7orp17.
Continuity should exist.
If OK, check harness for short-cir-
cuit.
OK
ENG
Check the following:
lHarness connectors
M50,F104
lHarness for open or
short-circuit between
ECM and combination
meter.
If NG, repair harness or
connectors.
CHECK GLOW INDICATOR LAMP.
Make sure that glow indicator lamp is
not burnt out.
OK
ENG
Replace glow indicator
lamp.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM har-
ness connector and retest.
INSPECTION END
YEC119A
YEC120A
H
H
H
H
H
H
TROUBLE DIAGNOSES 14CD20T
Glow Control System (Cont'd)
EC-122