Infiniti M45 (Y34). Manual - part 356

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

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 SEN 2 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 SEN 2 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 position.
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.

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.

Monitored item 

[Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

Description

Remarks

TROUBLE DIAGNOSIS

EC-115

C

D

E

F

G

H

I

J

K

L

M

A

EC

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 oper-
ating.

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.

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

Monitored item 

[Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

Description

Remarks

EC-116

TROUBLE DIAGNOSIS

NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

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.

O2SEN HTR DTY 
[%]

●

Indicates the heated oxygen sensor 1 
heater control value computed by the 
ECM according to the input signals.

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.

Voltage
[V]

●

Voltage, frequency, duty cycle or pulse 
width measured by the probe.

●

Only “#” is displayed if item is 
unable to be measured.

●

Figures with “#”s are temporary 
ones. They are the same figures 
as an actual piece of data which 
was just previously measured.

Frequency
[msec], [Hz] or [%]

DUTY-HI

DUTY-LOW

PLS WIDTH-HI

PLS WIDTH-LOW

Monitored item 

[Unit]

ECM 

INPUT 

SIG-

NALS

MAIN 

SIG-

NALS

Description

Remarks