Nissan Terrano r20e. Manual — part 196
Diagnostic Procedure
INSPECTION START
CHECK OVERALL FUNCTION.
With CONSULT-II
1. Turn ignition switch “ON”.
2. Perform “COOLING FAN” in “ACTIVE
TEST” mode with CONSULT-II.
3. Make sure that cooling fan operate.
Without CONSULT-II
1. Start engine and let it idle.
2. Set temperature lever at full cold posi-
tion.
3. Turn air conditioner switch “ON”.
4. Turn blower fan switch “ON”.
5. Make sure that cooling fan operate.
NG
E
OK
Go to “
q
C
”, EC-424.
CHECK COOLING FAN RELAY POWER
SUPPLY CIRCUIT.
1. Turn ignition switch “OFF”.
2. Disconnect cooling fan relay.
3. Check voltage between cooling fan
relay terminal
q
3
and ground with
CONSULT-II or tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
30A fuse
I
Harness for open or
short between cooling
fan relay and battery
If NG, repair or replace
harness or fuse.
CHECK COOLING FAN MOTOR AND
CONDENSER CIRCUIT.
1. Disconnect cooling fan relay harness
connector, cooling fan motor harness
connector and condenser harness con-
nector.
2. Check continuity as follows. Refer to
wiring diagram.
OK
E
NG
Check the following.
I
Harness connectors
M785
,
F67
I
Harness for open or
short between cooling
fan relay and cooling fan
motor
I
Harness for open or
short between cooling
fan relay and condenser
If NG, repair harness or
connectors.
q
A
Cooling fan relay terminal
q
5
and cooling fan motor terminal
q
1
Continuity
should
exist.
Cooling fan relay terminal
q
5
and condenser terminal
q
1
SEF646X
SEC163BA
MEC940D
H
H
H
H
DTC P1217 OVER HEAT
TD27Ti
EC-421
q
A
CHECK COOLING FAN MOTOR AND
CONDENSER GROUND CIRCUIT.
1. Check continuity between cooling fan
motor terminal
q
2
and ground. Refer to
wiring diagram.
Continuity should exist.
2. Check continuity between condenser
terminal
q
2
and ground. Refer to wiring
diagram.
Continuity should exist.
If OK, reconnect harness connectors.
OK
E
NG
Repair harness or connec-
tors.
CHECK COMPONENT
(Cooling fan relay).
Refer to “COMPONENT INSPECTION” on
page EC-426.
OK
CHECK A/C RELAY POWER SUPPLY
CIRCUIT.
1. Disconnect A/C relay.
2. Check voltage between A/C relay ter-
minal
q
2
,
q
3
and ground.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness connectors
F120
,
M812
I
10A fuse
I
Harness for open or
short between A/C relay
and fuse
If NG, repair or replace
harness or fuse.
CHECK A/C RELAY AND COOLING FAN
RELAY CIRCUIT.
1. Disconnect A/C relay and cooling fan
relay.
2. Check continuity between A/C relay
terminal
q
5
and cooling fan relay termi-
nal
q
1
. Refer to wiring diagram.
Continuity should exist.
OK
E
NG
Repair harness or connec-
tors.
CHECK ECM INPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check continuity as follows. Refer to
wiring diagram.
OK
E
NG
Check the following.
I
Harness connectors
M812
,
F120
I
Harness connectors
M787
,
F66
I
Harness for open or
short between A/C relay
and ECM
I
Harness for open or
short between cooling
fan relay and ECM
If NG, repair harness or
connectors.
q
B
ECM terminal
204
and A/C
relay terminal
q
1
Continuity
should
exist.
ECM terminal
219
and cool-
ing fan relay terminal
q
2
PBIB0185E
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H
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DTC P1217 OVER HEAT
TD27Ti
Diagnostic Procedure (Cont’d)
EC-422
q
B
CHECK COMPONENT
(A/C relay).
Refer to “COMPONENT INSPECTION” on
page EC-426.
OK
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
H
H
H
H
DTC P1217 OVER HEAT
TD27Ti
Diagnostic Procedure (Cont’d)
EC-423
q
c
CHECK COOLING SYSTEM FOR LEAK.
Apply pressure to the cooling system with
a tester, and check if the pressure drops.
Testing pressure:
157 kPa (1.6 kg/cm
2
, 23 psi)
Pressure should not drop.
CAUTION:
Higher than the specified pressure may
cause radiator damage.
OK
E
NG
Check the following for
leak.
I
Hose
I
Radiator
I
Water pump
Refer to LC section (“Water
Pump”).
CHECK RADIATOR CAP.
Apply pressure to cap with a tester.
Radiator cap relief pressure:
78 - 98 kPa (0.8 - 1.0 kg/cm
2
, 11 - 14
psi)
OK
E
NG
Replace radiator cap.
CHECK THERMOSTAT.
1. Check valve seating condition at normal
room temperatures.
It should seat tightly.
2. Check valve opening temperature and
valve lift.
Valve opening temperature:
76.5°C (170°F) [standard]
Valve lift:
More than 10 mm/90°C
(0.39 in/194°F)
3. Check if valve is closed at 5°C (9°F)
below valve opening temperature.
For details, refer to LC section (“Thermo-
stat”).
OK
E
NG
Replace thermostat
Check engine coolant temperature sensor.
Refer to “COMPONENT INSPECTION”,
EC-426.
OK
E
NG
Replace engine coolant
temperature sensor.
If the cause can not be isolated, go to
“MAIN 12 CAUSES OF OVERHEATING”
on EC-425.
INSPECTION END
SLC754A
SLC755A
SLC343
H
H
H
H
H
H
DTC P1217 OVER HEAT
TD27Ti
Diagnostic Procedure (Cont’d)
EC-424
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