Infiniti G20 (P11). Manual — part 179
SYSTEM — ENGINE MECHANICAL & OTHER
NCEC0041S03
SYMPTOM
Reference
page
HARD/NO
ST
AR
T/REST
AR
T
(EXCP
.
HA)
ENGINE
ST
ALL
HESIT
A
TION/SURGING/FLA
T
SPOT
SP
ARK
KNOCK/DET
ONA
TION
LACK
OF
POWER/POOR
ACCELERA
TION
HIGH
IDLE/LOW
IDLE
ROUGH
IDLE/HUNTING
IDLING
VIBRA
TION
SLOW/NO
RETURN
T
O
IDLE
OVERHEA
TS/W
A
TER
TEMPERA
TURE
HIGH
EXCESSIVE
FUEL
CONSUMPTION
EXCESSIVE
OIL
CONSUMPTION
BA
TTER
Y
DEAD
(UNDER
CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
AM
HA
Fuel
Fuel tank
5
5
FE section
Fuel piping
5
5
5
5
5
5
—
Vapor lock
Valve deposit
5
5
5
5
5
5
5
Poor fuel (Heavy weight
gasoline, Low octane)
Air
Air duct
5
5
5
5
5
5
Air cleaner
Air leakage from air duct
(Mass air flow sensor — throttle
body)
5
5
5
5
Throttle body, Throttle wire
FE section
Air leakage from intake manifold/
Collector/Gasket
—
Cranking
Battery
1
1
1
1
1
1
1
1
EL section
Alternator circuit
Starter circuit
3
Flywheel/Drive plate
6
EM section
PNP switch
4
AT section
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Matrix Chart (Cont’d)
EC-127
SYMPTOM
Reference
page
HARD/NO
ST
AR
T/REST
AR
T
(EXCP
.
HA)
ENGINE
ST
ALL
HESIT
A
TION/SURGING/FLA
T
SPOT
SP
ARK
KNOCK/DET
ONA
TION
LACK
OF
POWER/POOR
ACCELERA
TION
HIGH
IDLE/LOW
IDLE
ROUGH
IDLE/HUNTING
IDLING
VIBRA
TION
SLOW/NO
RETURN
T
O
IDLE
OVERHEA
TS/W
A
TER
TEMPERA
TURE
HIGH
EXCESSIVE
FUEL
CONSUMPTION
EXCESSIVE
OIL
CONSUMPTION
BA
TTER
Y
DEAD
(UNDER
CHARGE)
Warranty symptom code
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
AM
HA
Engine
Cylinder head
5
5
5
5
5
5
5
5
EM section
Cylinder head gasket
4
3
Cylinder block
6
6
6
6
6
6
6
6
4
Piston
Piston ring
Connecting rod
Bearing
Crankshaft
Valve
mecha-
nism
Timing chain
5
5
5
5
5
5
5
5
EM section
Camshaft
Intake valve
3
Exhaust valve
Exhaust
Exhaust manifold/Tube/Muffler/
Gasket
5
5
5
5
5
5
5
5
FE section
Three way catalyst
Lubrica-
tion
Oil pan/Oil strainer/Oil pump/Oil
filter/Oil gallery
5
5
5
5
5
5
5
5
MA, EM and
LC sections
Oil level (Low)/Filthy oil
LC section
Cooling
Radiator/Hose/Radiator filler cap
5
5
5
5
5
5
5
4
5
Thermostat
5
Water pump
Water gallery
Cooling fan
5
Coolant level (low)/
Contaminated coolant
MA section
1 - 6: The numbers refer to the order of inspection.
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Matrix Chart (Cont’d)
EC-128
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0042
Remarks:
I
Specification data are reference values.
I
Specification data are output/input values which are detected or supplied by the ECM at the connector.
* Specification data may not be directly related to their components signals/values/operations.
(i.e., Adjust ignition timing with a timing light before monitoring IGN TIMING. Specification data might be displayed even when igni-
tion timing is not adjusted to specification. This IGN TIMING monitors the data calculated by the ECM according to the input signals
from the camshaft position sensor and other ignition timing related sensors.)
I
If the real-time diagnosis results are NG, and the on board diagnostic system results are OK, when diagnosing the mass air flow sensor,
first check to see if the fuel pump control circuit is normal.
MONITOR ITEM
CONDITION
SPECIFICATION
ENG SPEED
I
Tachometer: Connect
I
Run engine and compare tachometer indication with the
CONSULT-II value.
Almost the same speed as the
CONSULT-II value.
MAS A/F SE-B1
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: “N”
I
No-load
Idle
1.3 - 1.7V
2,500 rpm
1.8 - 2.4V
B/FUEL SCHDL
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: “N”
I
No-load
Idle
1.0 - 1.6 msec
2,000 rpm
0.7 - 1.3 msec
A/F ALPHA-B1
I
Engine: After warming up
Maintaining engine speed at
2,000 rpm
53 - 155%
COOLAN TEMP/S
I
Engine: After warming up
More than 70°C (158°F)
HO2S1 (B1)
I
Engine: After warming up
Maintaining engine speed at
2,000 rpm
0 - 0.3V
+,
0.6 - 1.0V
HO2S1 MNTR (B1)
LEAN
+,
RICH
Changes more than 5 times
during 10 seconds.
HO2S2 (B1)
I
Engine: After warming up
Revving engine from idle to
3,000 rpm quickly
0 - 0.3V
+,
0.6 - 1.0V
HO2S2 MNTR (B1)
LEAN
+,
RICH
VHCL SPEED SE
I
Turn drive wheels and compare speedometer indication with
the CONSULT-II value
Almost the same speed as the
CONSULT-II value
BATTERY VOLT
I
Ignition switch: ON (Engine stopped)
11 - 14V
THRTL POS SEN
I
Engine: After warming up,
idle the engine
Throttle valve: fully closed
0.15 - 0.85V
I
Engine: After warming up
I
Ignition switch: ON
(Engine stopped)
Throttle valve: fully opened
3.5 - 4.7V
EGR TEMP SEN
I
Engine: After warming up
Less than 4.5V
EVAP SYS PRES
I
Ignition switch: ON
Approx. 3.4V
ABSOL PRES/SE
I
Ignition switch: ON
Approx. 4.4V
START SIGNAL
I
Ignition switch: ON
,
START
,
ON
OFF
,
ON
,
OFF
CLSD THL/P SW
CLSD THL POS
I
Engine: After warming up
I
Ignition switch: ON
(Engine stopped)
Throttle valve: Idle position
ON
Throttle valve: Slightly open
OFF
AIR COND SIG
I
Engine: After warming up,
idle the engine
A/C switch “OFF”
OFF
A/C switch “ON”
(Compressor operates)
ON
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
CONSULT-II Reference Value in Data Monitor Mode
EC-129
MONITOR ITEM
CONDITION
SPECIFICATION
P/N POSI SW
I
Ignition switch: ON
Shift lever “P” or “N”
ON
Except above
OFF
PW/ST SIGNAL
I
Engine: After warming up,
idle the engine
Steering wheel in neutral posi-
tion
(forward direction)
OFF
The steering wheel is turned
ON
LOAD SIGNAL
I
Ignition switch: ON
Rear window defogger switch
“ON” and/or lighting switch
“2ND”
ON
Rear window defogger switch
and lighting switch “OFF”
OFF
IGNITION SW
I
Ignition switch: ON
,
OFF
ON
,
OFF
INJ PULSE-B1
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: “N”
I
No-load
Idle
2.4 - 3.2 msec
2,000 rpm
1.9 - 2.8 msec
IGN TIMING
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: “N”
I
No-load
Idle
15°
±
2° BTDC
2,000 rpm
More than 25° BTDC
CAL/LD VALUE
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: “N”
I
No-load
Idle
20.0 - 35.5%
2,500 rpm
17.0 - 30.0%
ABSOL TH·P/S
I
Engine: After warming up,
idle the engine
Throttle valve: fully closed
0.0%
I
Engine: After warming up
I
Ignition switch: ON
(Engine stopped)
Throttle valve: fully opened
Approx. 88.0%
MASS AIRFLOW
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: N
I
No-load
Idle
2.5 - 5.0 g·m/s
2,500 rpm
7.1 - 12.5 g·m/s
IACV-AAC/V
I
Engine: After warming up
I
Air conditioner switch: OFF
I
Shift lever: “N”
I
No-load
Idle
5 - 20 steps
2,000 rpm
—
PURG VOL C/V
I
Engine: After warming up
I
Air conditioner switch: “OFF”
I
Shift lever: “N”
I
No-load
Idle
0 %
2,000 rpm
—
EGR VOL CON/V
I
Engine: After warming up
I
Air conditioner switch: “OFF”
I
Shift lever: “N”
I
No-load
Idle
0 step
Engine speed: Revving from
idle up to 3,000 rpm quickly
10 - 55 step
AIR COND RLY
I
Air conditioner switch: OFF
,
ON
OFF
,
ON
FUEL PUMP RLY
I
Ignition switch is turned to ON (Operates for 5 seconds)
I
Engine running and cranking
I
When engine is stopped (stops in 1.0 seconds)
ON
I
Except as shown above
OFF
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
CONSULT-II Reference Value in Data Monitor Mode (Cont’d)
EC-130
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