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DATA MONITOR (SPEC) MODE
NHEC0034S11
Monitored item [Unit]
ECM
input
signals
Main
signals
Description Remarks
ENG SPEED [rpm] qq
I Indicates the engine speed computed
from the REF signal (180° signal) of the
camshaft position sensor (PHASE).
MAS A/F SE-B1 [V] qq
I The signal voltage of the mass air flow
sensor specification is displayed.
I When engine is running specification
range is indicated.
B/FUEL SCHDL
[msec]
q
I “Base fuel schedule” indicates the fuel
injection pulse width programmed into
ECM, prior to any learned on board
correction.
I When engine is running specification
range is indicated.
A/F ALPHA-B1 [%]
A/F ALPHA-B2 [%]
q
I The mean value of the air-fuel ratio
feedback correction factor per cycle is
indicated.
I When engine is running specification
range is indicated.
I This data also includes the data for the
air-fuel ratio learning control.
ACTIVE TEST MODE
NHEC0034S07
TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY)
FUEL INJECTION
I Engine: Return to the original
trouble condition
I Change the amount of fuel injec-
tion using CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
I Harness and connector
I Fuel injectors
I Front heated oxygen sensor
IACV-AAC/V
OPENING
I Engine: After warming up, idle
the engine.
I Change the IACV-AAC valve
opening percent using CON-
SULT-II.
Engine speed changes according
to the opening percent.
I Harness and connector
I IACV-AAC valve
ENG COOLANT
TEMP
I Engine: Return to the original
trouble condition
I Change the engine coolant tem-
perature using CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
I Harness and connector
I Engine coolant temperature sen-
sor
I Fuel injectors
IGNITION TIMING
I Engine: Return to the original
trouble condition
I Timing light: Set
I Retard the ignition timing using
CONSULT-II.
If trouble symptom disappears, see
CHECK ITEM.
I Adjust initial ignition timing
POWER BAL-
ANCE
I Engine: After warming up, idle
the engine.
I A/C switch “OFF”
I Shift lever “N”
I Cut off each injector signal one
at a time using CONSULT-II.
Engine runs rough or dies.
I Harness and connector
I Compression
I Injectors
I Power transistor
I Spark plugs
I Ignition coils
COOLING FAN
I Ignition switch: ON
I Turn the cooling fan “ON” and
“OFF” using CONSULT-II.
Cooling fan moves and stops.
I Harness and connector
I Cooling fan motor
I Cooling fan relay
FUEL PUMP
RELAY
I Ignition switch: ON
(Engine stopped)
I Turn the fuel pump relay “ON”
and “OFF” using CONSULT-II
and listen to operating sound.
Fuel pump relay makes the operat-
ing sound.
I Harness and connector
I Fuel pump relay
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
CONSULT-II (Cont’d)
EC-99
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