Infiniti F50. Manual - part 368

TROUBLE DIAGNOSIS

EC-113

C

D

E

F

G

H

I

J

K

L

M

A

EC

*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE
Monitored Item

×

: Applicable

B/FUEL SCHDL 
[msec]

●

The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE [

°

C] 

or [

°

F]

●

The intake air temperature at the moment a malfunction is detected is displayed.

Freeze frame data 

item*

Description

Monitored item 

[Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

CAN 

DIAG 
SUP-

PORT 

MNTR

Description

Remarks

ENG SPEED
[rpm]

×

×

●

Indicates the engine speed computed 
from the signals of the crankshaft posi-
tion sensor (POS) and camshaft posi-
tion sensor (PHASE).

●

Accuracy becomes poor if engine 
speed drops below the idle rpm.

●

If the signal is interrupted while the 
engine is running, an abnormal 
value may be indicated.

MAS A/F SE-B1
[V]

×

×

●

The signal voltage of the mass air flow 
sensor is displayed.

●

When the engine is stopped, a 
certain value is indicated.

COOLAN TEMP/S 
[

°

C] or [

°

F]

×

×

●

The engine coolant temperature (deter-
mined by the signal voltage of the 
engine coolant temperature sensor) is 
displayed.

●

When the engine coolant tempera-
ture sensor is open or short-cir-
cuited, ECM enters fail-safe mode. 
The engine coolant temperature 
determined by the ECM is dis-
played.

HO2S1 (B1) [V]

×

×

●

The signal voltage of the heated oxygen 
sensor 1 is displayed.

HO2S1 (B2) [V]

×

HO2S2 (B1) [V]

×

●

The signal voltage of the heated oxygen 
sensor 2 is displayed.

HO2S2 (B2) [V]

×

HO2S1 MNTR (B1) 
[RICH/LEAN]

×

×

●

Display of heated oxygen sensor 1 sig-
nal during air-fuel ratio feedback control:
RICH ... means the mixture became 
“rich”, and control is being affected 
toward a leaner mixture.
LEAN ... means the mixture became 
“lean”, and control is being affected 
toward a rich mixture.

●

After turning ON the ignition 
switch, “RICH” is displayed until 
air-fuel mixture ratio feedback 
control begins.

●

When the air-fuel ratio feedback is 
clamped, the value just before the 
clamping is displayed continu-
ously.

HO2S1 MNTR (B2) 
[RICH/LEAN]

×

HO2S2 MNTR (B1) 
[RICH/LEAN]

×

●

Display of heated oxygen sensor 2 sig-
nal:
RICH ... means the amount of oxygen 
after three way catalyst is relatively 
small.
LEAN ... means the amount of oxygen 
after three way catalyst is relatively 
large.

●

When the engine is stopped, a 
certain value is indicated.

HO2S2 MNTR (B2) 
[RICH/LEAN]

×

VHCL SPEED SE 
[km/h] or [mph]

×

×

●

The vehicle speed computed from the 
vehicle speed signal is displayed.

BATTERY VOLT 
[V]

×

×

●

The power supply voltage of ECM is dis-
played.

ACCEL SEN 1 [V]

×

×

●

The accelerator pedal position sensor 
signal voltage is displayed.

●

ACCEL SE2 signal is converted 
by ECM internally. Thus, it differs 
from ECM terminal voltage signal.

ACCEL SEN 2 [V]

×

EC-114

TROUBLE DIAGNOSIS

THRTL SEN 1 [V]

×

×

●

The throttle position sensor signal volt-
age is displayed.

●

THRTL SEN2 signal is converted 
by ECM internally. Thus, it differs 
from ECM terminal voltage signal.

THRTL SEN 2 [V]

×

FUEL T/TEMP SE 
[

°

C] or [

°

F]

×

●

The fuel temperature (determined by the 
signal voltage of the fuel tank tempera-
ture sensor) is displayed.

INT/A TEMP SE 
[

°

C] or [

°

F]

×

×

●

The intake air temperature (determined 
by the signal voltage of the intake air 
temperature sensor) is indicated.

EVAP SYS PRES 
[V]

×

●

The signal voltage of EVAP control sys-
tem pressure sensor is displayed.

FUEL LEVEL SE 
[V]

×

●

The signal voltage of the fuel level sen-
sor is displayed.

START SIGNAL 
[ON/OFF]

×

×

●

Indicates [ON/OFF] condition from the 
starter signal.

●

After starting the engine, [OFF] is 
displayed regardless of the starter 
signal.

CLSD THL POS 
[ON/OFF]

×

×

●

Indicates idle position [ON/OFF] com-
puted by ECM according to the acceler-
ator pedal position sensor signal.

AIR COND SIG 
[ON/OFF]

×

×

●

Indicates [ON/OFF] condition of the air 
conditioner switch determined by the air 
conditioner signal.

P/N POSI SW
[ON/OFF]

×

×

●

Indicates [ON/OFF] condition from the 
park/neutral position (PNP) switch sig-
nal.

PW/ST SIGNAL 
[ON/OFF]

×

×

●

[ON/OFF] condition of the power steer-
ing system (determined by the signal 
voltage of the power steering pressure 
sensor signal) is indicated.

LOAD SIGNAL 
[ON/OFF]

×

×

●

Indicates [ON/OFF] condition from the 
electrical load signal.
ON ... Rear window defogger switch is 
ON and/or lighting switch is in 2nd posi-
tion.
OFF ... Both rear window defogger 
switch and lighting switch are OFF.

IGNITION SW
[ON/OFF]

×

●

Indicates [ON/OFF] condition from igni-
tion switch.

HEATER FAN SW 
[ON/OFF]

×

●

Indicates [ON/OFF] condition from the 
heater fan switch signal. 

BRAKE SW
[ON/OFF]

●

Indicates [ON/OFF] condition from the 
stop lamp switch signal.

INJ PULSE-B1 
[msec]

×

●

Indicates the actual fuel injection pulse 
width compensated by ECM according 
to the input signals.

●

When the engine is stopped, a 
certain computed value is indi-
cated.

INJ PULSE-B2 
[msec]

B/FUEL SCHDL 
[msec]

●

“Base fuel schedule” indicates the fuel 
injection pulse width programmed into 
ECM, prior to any learned on board cor-
rection.

Monitored item 

[Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

CAN 

DIAG 
SUP-

PORT 

MNTR

Description

Remarks

TROUBLE DIAGNOSIS

EC-115

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F

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J

K

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M

A

EC

IGN TIMING 
[BTDC]

×

●

Indicates the ignition timing computed 
by ECM according to the input signals.

●

When the engine is stopped, a 
certain value is indicated.

A/F ALPHA-B1
[%]

×

●

The mean value of the air-fuel ratio 
feedback correction factor per cycle is 
indicated.

●

When the engine is stopped, a 
certain value is indicated.

●

This data also includes the data 
for the air-fuel ratio learning con-
trol.

A/F ALPHA-B2
[%]

×

CAL/LD VALUE
[%]

●

“Calculated load value” indicates the 
value of the current airflow divided by 
peak airflow.

MASS AIRFLOW 
[g·m/s]

●

Indicates the mass airflow computed by 
ECM according to the signal voltage of 
the mass air flow sensor.

PURG VOL C/V 
[%]

●

Indicates the EVAP canister purge vol-
ume control solenoid valve control value 
computed by the ECM according to the 
input signals.

●

The opening becomes larger as the 
value increases.

INT/V TIM (B1) 
[

°

CA]

●

Indicates [

°

CA] of intake camshaft 

advanced angle. 

INT/V TIM (B2) 
[

°

CA]

INT/V SOL (B1)
[%]

●

The control value of the intake valve tim-
ing control solenoid valve (determined 
by ECM according to the input signal) is 
indicated. 

●

The advance angle becomes larger as 
the value increases.

INT/V SOL (B2)
[%]

VIAS S/V
[ON/OFF]

●

The control condition of the VIAS control 
solenoid valve (determined by ECM 
according to the input signals) is indi-
cated.

●

OFF ... VIAS control solenoid valve is 
not operating.
ON ... VIAS control solenoid valve is 
operating.

AIR COND RLY 
[ON/OFF]

×

●

The air conditioner relay control condi-
tion (determined by ECM according to 
the input signals) is indicated.

FUEL PUMP RLY 
[ON/OFF]

×

●

Indicates the fuel pump relay control 
condition determined by ECM according 
to the input signals.

FPCM
[HI/LOW]

×

●

The control condition of the fuel pump 
control module (FPCM) (determined by 
the ECM according to the input signals) 
is indicated.

Monitored item 

[Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

CAN 

DIAG 
SUP-

PORT 

MNTR

Description

Remarks

EC-116

TROUBLE DIAGNOSIS

VC/V BYPASS/V 
[ON/OFF]

●

The control condition of the vacuum cut 
valve bypass valve (determined by ECM 
according to the input signals) is indi-
cated.

●

ON ... Open
OFF ... Closed

VENT CONT/V 
[ON/OFF]

●

The control condition of the EVAP canis-
ter vent control valve (determined by 
ECM according to the input signals) is 
indicated.

●

ON ... Closed
OFF ... Open

THRTL RELAY 
[ON/OFF]

●

Indicates the throttle control motor relay 
control condition determined by the 
ECM according to the input signals.

HO2S1 HTR (B1) 
[ON/OFF]

●

Indicates [ON/OFF] condition of heated 
oxygen sensor 1 heater determined by 
ECM according to the input signals.

HO2S1 HTR (B2) 
[ON/OFF]

HO2S2 HTR (B1) 
[ON/OFF]

●

Indicates [ON/OFF] condition of heated 
oxygen sensor 2 heater determined by 
ECM according to the input signals.

HO2S2 HTR (B2) 
[ON/OFF]

IDL A/V LEARN 
[YET/CMPLT]

●

Display the condition of idle air volume 
learning.
YET ... Idle Air Volume Learning has not 
been performed yet.
CMPLT ... Idle Air Volume Learning has 
already been performed successfully.

TRVL AFTER MIL 
[km] or [mile]

●

Distance traveled while MIL is activated.

TRGT FAN RPM 
[rpm]

●

The target speed of cooling fan opera-
tion (determined by the ECM according 
to the input signals) is displayed.

RADIATOR TEMP 
[

°

C] or [

°

F]

●

The radiator coolant temperature (deter-
mined by the signal of the radiator cool-
ant temperature sensor) is displayed.

AC PRESS SEN 
[V]

●

The signal voltage from the refrigerant 
pressure sensor is displayed.

FAN AMP
[mA]

●

Indicates cooling fan speed control sole-
noid valve control value computed by 
the ECM according to the input signals.

●

The cooling fan operating speed 
becomes higher as the value decrease.

Monitored item 

[Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

CAN 

DIAG 
SUP-

PORT 

MNTR

Description

Remarks