Nissan Silvia. Manual — part 161
Wiring Diagram
NMEC0736
TEC809
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Wiring Diagram
EC-159
Diagnostic Procedure
NMEC0737
1
CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Set the tester probe between ECM terminal 111 [HO2S1 heater (front) signal] and ground.
3. Start engine and let it idle.
4. Check the voltage under the following conditions.
SEC420C
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 2.
2
CHECK POWER SUPPLY
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 1 (front) harness connector.
SEC383C
3. Turn ignition switch “ON”.
4. Check voltage between HO2S1 terminal 1 and ground with CONSULT-II or tester.
SEC399C
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Diagnostic Procedure
EC-160
3
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors F4, M60
I
Fuse block (J/B) connector M7
I
10A fuse
I
Harness for open or short between heated oxygen sensor 1 (front) and fuse
©
Repair harness or connectors.
4
CHECK GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between HO2S1 terminal 3 and ECM terminal 111.
Refer to wiring diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 5.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
5
CHECK HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Refer to “Component Inspection”, EC-161.
OK or NG
OK
©
GO TO 6.
NG
©
Replace heated oxygen sensor 1 (front).
6
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-82.
©
INSPECTION END
SEC400C
Component Inspection
NMEC0738
HEATED OXYGEN SENSOR 1 HEATER (FRONT)
NMEC0738S01
Check resistance between terminals 3 and 1.
Resistance: 2.3 - 4.3
Ω
at 25°C (77°F)
Check continuity between terminals 2 and 1, 3 and 2.
Continuity should not exist.
If NG, replace the heated oxygen sensor 1 (front).
CAUTION:
I
Discard any heated oxygen sensor which has been
dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
I
Before installing new oxygen sensor, clean exhaust sys-
tem threads using Oxygen Sensor Thread Cleaner tool
and approved anti-seize lubricant.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Diagnostic Procedure (Cont’d)
EC-161
SEF080X
Component Description
NMEC0739
The vehicle speed sensor is installed in the transaxle. It contains a
pulse generator which provides a vehicle speed signal to the
speedometer. The speedometer then sends a signal to the ECM.
ECM Terminals and Reference Value
NMEC0740
Specification 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 grond other than ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
32
W/PU
Vehicle speed sensor
[Engine is running]
I
Lift up the vehicle
I
Shift gear “ON”
I
Vehicle speed is 40 km/h (25 MPH)
2.0 - 3.0V
SEC368C
VEHICLE SPEED SENSOR (VSS)
Component Description
EC-162
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