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8-6Engine Lubrication
Low Oil Pressure Indicator Circuit Diagram
D2
Q9
H1
191
17
36
B7
CANL
CANH DRIVERBRN
12 V
5V GAUGE CONTROL MODULE (TACH)
IGNITION SWITCH
BATIG1
ECM/PCM
OPSW
A37
A36 RED
WHT CPU
No. 2 (50 A)
No. 10
(7.5 A)
BATTERY
UNDER-HOOD FUSE/RELAY BOX
No. 1 (100 A)
YEL/REDUNDER-DASH
FUSE/RELAY BOX
LOW OIL
PRESSURE
INDICATOR
OIL PRESSURE SWITCH
(Closed: Lost pressure)
IG1 HOT in ON (II)
and START (III)
1
WHT BLU
CANH
CANL
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Standard Thermostat
Lift Height: Above 8.0 mm (0.31 in.)
Starts Opening: 76 80 °C (169 176 °F)
Fully Open: 90 °C (194 °F)
10-510-5
Fan Motor Test
Thermostat Test
B
A
1. Disconnect the 2P connectors from the radiator fan motor and the A/C condenser fan motor.
2. Test the motor by connecting battery power to terminal No. 2 and ground to terminal No. 1.
3. If the motor fails to run or does not run smoothly, replace it (see page 10-19). Replace the thermostat if it is stuck in the open position
at room temperature.
To test a closed thermostat:
1. Suspend the thermostat (A) in a container of water. Do not let the thermostat and the thermometer (B)
touch the bottom of the hot container.
2. Heat the water, and check the temperature with a thermometer. Check the temperature when the
thermostat first opens, then check the temperature
again when the thermostat is fully open.
3. Measure the lift height of the thermostat when it is fully open. If it thermostat is not within the
specification, replace it.
Terminal side of
male terminals
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10-1910-19
Radiator and Fan Replacement
B
A
6x1.0mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)
AB
C
A
C
C C
5. Install the harness holder bracket (A), then install
the harness holder (B).
6. Install the air cleaner assembly (see page 11-345).
7. Refill the radiator with engine coolant, and bleed the air from the cooling system with the heater
valve open (see step 6 on page 10-8).
8. Clean up any spilled engine coolant. 1. Do the battery removal procedure (see page 22-69).
2. Drain the engine coolant (see page 10-8).
3. Remove the front grille cover (see page 20-163).
4. Disconnect the fan motor connectors (A) and the
hood switch connector (B), then remove the
harnessclamps(C).
(cont’d)
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10-1910-19
Radiator and Fan Replacement
B
A
6x1.0mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)
AB
C
A
C
C C
5. Install the harness holder bracket (A), then install
the harness holder (B).
6. Install the air cleaner assembly (see page 11-345).
7. Refill the radiator with engine coolant, and bleed the air from the cooling system with the heater
valve open (see step 6 on page 10-8).
8. Clean up any spilled engine coolant. 1. Do the battery removal procedure (see page 22-69).
2. Drain the engine coolant (see page 10-8).
3. Remove the front grille cover (see page 20-163).
4. Disconnect the fan motor connectors (A) and the
hood switch connector (B), then remove the
harnessclamps(C).
(cont’d)
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10-22Cooling System
Radiator and Fan Replacement (cont’d)
RADIATOR FAN MOTOR
6x1.0mm
7 N·m
(0.7 kgf·m, 5 lbf·ft) RADIATOR FAN
UPPER RADIATOR HOSE
LOWER RADIATOR HOSE
O-RING
RADIATOR CAP
RADIATOR
O-RING LOWER CUSHION
DRAIN PLUG
6x1.0mm
7 N·m
(0.7 kgf·m, 5 lbf·ft)
A/C CONDENSER
FAN/SHROUD ASSEMBLY
RADIATOR FAN SHROUD
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR 2
12 N·m (1.2 kgf·m, 8.7 lbf·ft)
3.85 N·m
(0.393 kgf·m, 2.84 lbf·ft)
6.0 N·m
(0.61 kgf·m, 4.4 lbf·ft)
QUICK CONNECTOR
O-RING
14. Pull up the radiator, then remove the fan shroud assemblies and other parts from the radiator.
15. Install the radiator in the reverse order of removal. Make sure the upper and lower cushions are set securely.
16. Connect the lower radiator hose to the radiator.
17. Install the bulkhead in the reverse order of removal. Apply body paint to the bulkhead mounting bolts.
18. Do the battery installation procedure (see page 22-69).
19. Fill the radiator with engine coolant, and bleed the air from the cooling system with heater valve open (see step 6 on page 10-8).
20. Clean up any spilled engine coolant.
Replace. Replace.
Replace.
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10-25
Circuit Diagram
ECT2
SG6
SG2
ECT1 FANH
FANL
SUBRLY IG2HOTinON(II)
PNK
5V No. 15 (7.5 A)
A21
PUR
ECM/PCM
2G301
BLK
2
1
No. 11 (15 A)
(10 A) No. 36
B23
RED/WHT GRN/BLK B33
BLU GRY
BRN
A33
BLK GRN A9 IGNITION SWITCH
IG2
BAT
RED
3
2 5
4 1
A4
A5 13
4
2
1 2 23 4
1 No. 2 (50 A)
BLK
UNDER-HOOD FUSE/RELAY BOX
BATTERY
G301No. 1 (100 A)
No. 6 (20 A)
A/C
CONDENSER
FAN RELAY
ENGINE COOLANT
TEMPERATURE
(ECT) SENSOR 1
A/C
CONDENSER
FAN MOTOR
FAN
CONTROL
RELAY
RADIATOR
FAN
MOTOR
ENGINE COOLANT
TEMPERATURE
(ECT) SENSOR 2 RADIATOR
FAN
RELAY
PGM-FI
SUB RELAY
H1
3 4
ORN
G12
D1
F16
F7
F2
F12
F14
F1
F11 No. 7 (20 A)
21
1 UNDER-DASH
FUSE/RELAY
BOX
BRN
WHT
43
12 C3
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YES
NO
YES
NO
YES
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YES
NO
10-26Fan Controls
Radiator Fan High Speed Circuit Troubleshooting
RADIATOR FAN RELAY 4P SOCKET
FAN CONTROL RELAY 5P SOCKET
JUMPER WIRE
RADIATOR FAN RELAY 4P SOCKET JUMPER WIRE
1. Check the No. 7 (20 A) fuse in the under-hood fuse/relay box and the No. 36 (10 A) fuse in the under-
dash fuse/relay box.
Reinstall the fuse(s), then go to step 2.
Replace the fuse(s), and recheck. If the fuse
continues to blow, locate and repair the short in the
circuit between the under-hood fuse/relay box and
the radiator fan motor, or between the under-dash
fuse/relay box connector terminal G12, the under-
hood fuse/relay box and the engine control module
(ECM)/powertrain control module (PCM).
2. Remove the radiator fan relay and the fan control relay from the under-hood fuse/relay box, and test
them (see page 22-70).
Go to step 3.
Replace the radiator fan relay and/or fan
control relay.
3. Measure the voltage between the radiator fan relay 4P socket terminal No. 1 and body ground.
Go to step 4.
Replace the under-hood fuse/relay box. 4. Connect fan control relay 5P socket terminals No. 1
andNo.2withajumperwire.
5. Connect radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.
Go to step 10.
Go to step 6.
Terminal side of female terminals Terminal side of female terminals
Terminal side of female terminals
Ar e t he f uses OK ? Ar e t he r el ay s OK ?
Is there battery voltage? Does t he r ad i at or f an r un at hi gh speed ?
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10-28Fan Controls
Radiator Fan High Speed Circuit Troubleshooting (cont’d)
FAN CONTROL RELAY 5P SOCKET
RADIATOR FAN MOTOR 2P CONNECTOR RED RADIATOR FAN RELAY 4P SOCKET
9. Check for continuity between fan control relay 5P
socket terminal No. 1 and radiator fan motor 2P
connector terminal No. 1.
Check for poor connections or loose
terminals at the under-hood fuse/relay box, the
radiator fan motor, and body ground (G 301), then
go to step 1.
Repair open in the wire between fan control
relay 5P socket terminal No. 1 and radiator fan
motor 2P connector terminal No. 1. 10. Turn the ignition switch to ON (II).
11. Measure the voltage between radiator fan relay 4P
socket terminal No. 3 and body ground.
Go to step 12.
Repair open in the wire between the under-
dash fuse/relay box and the under-hood fuse/relay
box.
12. Turn the ignition switch to LOCK (0).
13. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on page 11-3).
14. Turn the ignition switch to ON (II).
15. Make sure the HDS communicates with the vehicle and the ECM/PCM. If it does not communicate,
troubleshoot the DLC circuit (see page 11-204).
16. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
NOTE: This step must be done to protect the ECM/
PCMfromdamage.
17. Disconnect ECM/PCM connector A (44P).
Terminal side of female termianls
Wire side of female terminals Terminal side of female terminals
Is there continuity?
Is there battery voltage?
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