Nissan Silvia. Instruction — part 160
4
RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEC377C
3. Disconnect heated oxygen sensor 1 (HO2S1) (front) harness connector.
SEC383C
©
GO TO 5.
5
RETIGHTEN HEATED OXYGEN SENSOR 1 (FRONT)
Loosen and retighten corresponding heated oxygen sensor 1 (front).
Tightening torque:
40 - 60 N·m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
©
GO TO 6.
6
CHECK INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 19 and HO2S1 terminal 2.
Refer to wiring diagram.
Continuity should exist.
3. Check harness continuity between ECM terminal 19 (or HO2S1 terminal 2) and ground.
Continuity should not exist.
4. Also check harness for short to power.
OK or NG
OK
©
GO TO 7.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
HEATED OXYGEN SENSOR 1 (FRONT)
Diagnostic Procedure (Cont’d)
EC-155
7
CHECK HEATED OXYGEN SENSOR 1 (FRONT)
Refer to “Component Inspection”, EC-156.
OK or NG
OK
©
GO TO 8.
NG
©
Replace heated oxygen sensor 1 (front).
8
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-82.
©
INSPECTION END
SEC415C
SEC416C
Component Inspection
NMEC0732
HEATED OXYGEN SENSOR 1 (FRONT)
NMEC0732S01
With CONSULT-II
1)
Start engine and warm it up to normal operating temperature.
2)
Select “MANU TRIG” in “DATA MONITOR” mode, and select
“O2S1” and “M/R F/C MNT”.
3)
Hold engine speed at 2,000 rpm under no load during the fol-
lowing steps.
4)
Touch “RECORD” on CONSULT-II screen.
5)
Check the following.
I
“M/R F/C MNT” in “DATA MONITOR” mode changes from
“RICH” to “LEAN” to “RICH” 5 times in 10 seconds.
5 times (cycles) are counted as shown below:
R = “M/R F/C MNT”, “RICH”
L = “M/R F/C MNT”, “LEAN”
I
“O2S1” voltage goes above 0.6V at least once.
I
“O2S1” voltage goes below 0.3V at least once.
I
“O2S1” voltage never exceeds 1.0V.
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.
HEATED OXYGEN SENSOR 1 (FRONT)
Diagnostic Procedure (Cont’d)
EC-156
SEC417C
SEC418C
Without CONSULT-II
1)
Start engine and warm it up to normal operating temperature.
2)
Set voltmeter probes between ECM terminal 19 (HO2S1 sig-
nal) and engine ground.
3)
Check the following with engine speed held at 2,000 rpm con-
stant under no load.
I
Malfunction indicator goes on more than five times within 10
seconds in Diagnostic Test Mode II [HEATED OXYGEN SEN-
SOR 1 MONITOR (FRONT).]
I
The maximum voltage is over 0.6V at least one time.
I
The minimum voltage is below 0.3V at least one time.
I
The voltage never exceeds 1.0V.
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 (FRONT)
Component Inspection (Cont’d)
EC-157
Description
NMEC0733
SYSTEM DESCRIPTION
NMEC0733S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor
Engine speed
Heated
oxygen
sensor 1
heater
(front) con-
trol
Heated oxygen sensor 1 heater
(front)
The ECM performs ON/OFF control of the heated oxygen sensor 1 heater (front) corresponding to the engine
operating condition.
OPERATION
NMEC0733S02
Engine speed
Heated oxygen sensor 1 heater (front)
Above 4,000 rpm
OFF
Below 4,000 rpm
ON
ECM Terminals and Reference Value
NMEC0735
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 ground other than ECM terminals, such as the ground.
TERMI-
NAL NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
111
B/R
Heated oxygen sensor 1
heater (front)
[Engine is running]
I
Engine speed is below 4,000 rpm.
Approximately 0V
[Engine is running]
I
Engine speed is above 4,000 rpm.
BATTERY VOLTAGE
(11 - 14V)
HEATED OXYGEN SENSOR 1 HEATER (FRONT)
Description
EC-158
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