Nissan Silvia. Manual — part 175
Diagnostic Procedure
=NMEC0793
1
INSPECTION START
Do you have CONSULT-II?
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 3.
2
CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine.
2. Check “PW/ST SIGNAL” in “DATA MONITOR” mode with CONSULT-II under the following conditions.
SEF311Y
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 4.
3
CHECK OVERALL FUNCTION
Without CONSULT-II
1. Start engine.
2. Check voltage between ECM terminal 43 and ground under the following conditions.
SEC425C
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 4.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
POWER STEERING OIL PRESSURE SWITCH
Diagnostic Procedure
EC-215
4
CHECK GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect power steering oil pressure switch harness connector.
SEC391C
3. Check harness continuity between power steering oil pressure switch terminal 2 and engine ground.
Refer to wiring diagram.
Continuity should exist.
4. Also check harness for short to power.
OK or NG
OK
©
GO TO 5.
NG
©
Repair open circuit or short to power in harness or connectors.
5
CHECK INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 43 and power steering oil pressure switch terminal 1.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 7.
NG
©
GO TO 6.
6
DETECT MALFUNCTIONING PART
Check the harness for open or short between ECM and power steering oil pressure switch.
©
Repair open circuit or short to ground or short to power in harness or connectors.
7
CHECK POWER STEERING OIL PRESSURE SWITCH
Refer to “Component Inspection”, EC-217.
OK or NG
OK
©
GO TO 8.
NG
©
Replace power steering oil pressure switch.
8
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-82.
©
INSPECTION END
POWER STEERING OIL PRESSURE SWITCH
Diagnostic Procedure (Cont’d)
EC-216
Component Inspection
NMEC0794
POWER STEERING OIL PRESSURE SWITCH
NMEC0794S01
1.
Disconnect power steering oil pressure switch harness con-
nector then start engine.
2.
Check continuity between terminals 1 and 2.
Refer to wiring diagram.
Conditions
Continuity
Steering wheel is being fully turned.
Yes
Steering wheel is not being turned.
No
If NG, replace power steering oil pressure switch.
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
POWER STEERING OIL PRESSURE SWITCH
Component Inspection
EC-217
CONSULT-II Reference Value in Data Monitor
Mode
NMEC0795
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
LOAD SIGNAL
I
Ignition switch: ON
Rear window defogger is operating
and/or lighting switch is “2ND”
position.
ON
Rear window defogger is not oper-
ating and lighting switch is “OFF”.
OFF
ECM Terminals and Reference Value
NMEC0796
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)
33
PU
(A/T)
G/R
(M/T)
Electric load signal
(Load switch)
[Ignition switch “ON”]
I
Rear window defogger is operating and/or lighting
switch is “2ND” position
BATTERY VOLTAGE
(11 - 14V)
[Ignition switch “ON”]
I
Rear window defogger is not operating and light-
ing switch is “OFF”
Approximately 0V
ELECTRICAL LOAD SIGNAL
CONSULT-II Reference Value in Data Monitor Mode
EC-218
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