Nissan Altima L32. Manual - part 464

REFRIGERANT PRESSURE SENSOR

EC-977

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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>> Repair open circuit or short to ground or short to power in harness or connectors.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace refrigerant pressure sensor.

NO

>> Repair or replace. 

EC-978

< ECU DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ECM

ECU DIAGNOSIS

ECM

Reference Value

INFOID:0000000004349974

VALUES ON THE DIAGNOSIS TOOL

Remarks:
z

 Specification data are reference values.

z

 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, because the monitor may show the specification data in spite of the

ignition timing not being adjusted to the specification data. this IGN TIMING monitors the data calculated by the ECM according to the signals

input from the camshaft position sensor and other ignition timing related sensors.

Monitor Item

Condition

Values/Status

ENG SPEED

• Run engine and compare CONSULT-III value with the tachometer indication.

Almost the same speed as 
the tachometer indication.

MAS A/F SE-B1

See 

EC-666, "Diagnosis Procedure"

.

B/FUEL SCHDL

See 

EC-666, "Diagnosis Procedure"

.

A/F ALPHA-B1

See 

EC-666, "Diagnosis Procedure"

.

COOLAN TEMP/S

• Engine: After warming up

More than 70

°C (158°F)

A/F SEN1 (B1)

• Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 2.2 V

HO2S2 (B1)

• Revving engine from idle up to 3,000 rpm quickly after the following conditions 

are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

0 - 0.3V 

←→ Approx. 0.6 - 

1.0V

HO2S2 MNTR(B1)

• Revving engine from idle up to 3,000 rpm quickly after the following conditions 

are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

LEAN 

←→ RICH

VHCL SPEED SE

• Turn drive wheels and compare CONSULT-III value with the speedometer in-

dication.

Almost the same speed as 
speedometer indication

BATTERY VOLT

• Ignition switch: ON (Engine stopped)

11 - 14V

ACCEL SEN 1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0V

Accelerator pedal: Fully depressed

4.2 - 4.8V

ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0V

Accelerator pedal: Fully depressed

4.2 - 4.8V

TP SEN 1-B1

• Ignition switch: ON

(Engine stopped)

• Shift lever: D (CVT), 1st (M/T)

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

TP SEN 2-B1*

1

• Ignition switch: ON

(Engine stopped)

• Shift lever: D (CVT), 1st (M/T)

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

FUEL T/TMP SE

• Ignition switch: ON

Indicates fuel tank tempera-
ture

INT/A TEMP SE

• Ignition switch: ON

Indicates intake air tempera-
ture

EVAP SYS PRES

• Ignition switch: ON

Approx. 1.8 - 4.8V

FUEL LEVEL SE

• Ignition switch: ON

Depending on fuel level of 
fuel tank

START SIGNAL

• Ignition switch: ON 

→ START → ON

OFF 

→ ON → OFF

CLSD THL POS

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

ON

Accelerator pedal: Slightly depressed

OFF

ECM

EC-979

< ECU DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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AIR COND SIG

• Engine: After warming up, idle the 

engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates.)

ON

P/N POSI SW

• Ignition switch: ON

Shift lever: P or N (CVT), Neutral (M/T)

ON

Selector lever: Except above

OFF

PW/ST SIGNAL

• Engine: After warming up, idle the 

engine

Steering wheel: Not being turned

OFF

Steering wheel: Being turned

ON

LOAD SIGNAL

• Ignition switch: ON

Rear window defogger switch: ON
and/or Lighting switch: 2nd position

ON

Rear window defogger switch and lighting 
switch: OFF

OFF

IGNITION SW

• Ignition switch: ON 

→ OFF → ON

ON 

→ OFF → ON

HEATER FAN SW

• Engine: After warming up, idle the 

engine

Heater fan switch: ON

ON

Heater fan switch: OFF

OFF

BRAKE SW

• Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

INJ PULSE-B1

• Engine: After warming up
• Shift lever: P or N (CVT), Neutral 

(M/T)

• Air conditioner switch: OFF
• No  load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

IGN TIMING

• Engine: After warming up
• Shift lever: P or N (CVT), Neutral 

(M/T)

• Air conditioner switch: OFF
• No  load

Idle

10

° - 20° BTDC

2,000 rpm

25

° - 45° BTDC

CAL/LD VALUE

• Engine: After warming up
• Shift lever: P or N (CVT), Neutral 

(M/T)

• Air conditioner switch: OFF
• No  load

Idle

10% - 35%

2,500 rpm

10% - 35%

MASS AIRFLOW

• Engine: After warming up
• Shift lever: P or N (CVT), Neutral 

(M/T)

• Air conditioner switch: OFF
• No  load

Idle

1.0 - 4.0 g·m/s

2,500 rpm

4.0 - 10.0 g·m/s

PURG VOL C/V

• Engine: After warming up
• Shift lever: P or N (CVT), Neutral 

(M/T)

• Air conditioner switch: OFF
• No  load

Idle
(Accelerator pedal: Not depressed even 
slightly, after engine starting.)

0%

2,000 rpm

20% - 90%

INT/V TIM(B1)

• Engine: After warming up
• Shift lever: P or N (CVT), Neutral 

(M/T)

• Air conditioner switch: OFF
• No  load

Idle

−5° - 5°CA

2,000 rpm

Approx. 0

° - 20°CA

INT/V SOL(B1)

• Engine: After warming up
• Shift lever: P or N (CVT), Neutral 

(M/T)

• Air conditioner switch: OFF
• No  load

Idle

0%

2,000 rpm

Approx. 0% - 60%

AIR COND RLY

• Engine: After warming up, idle the 

engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates)

ON

Monitor Item

Condition

Values/Status

EC-980

< ECU DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ECM

FUEL PUMP RLY

• For 1 seconds after turning ignition switch: ON
• Engine running or cranking

ON

• Except above

OFF

VENT CONT/V

• Ignition switch: ON

OFF

THRTL RELAY

• Ignition switch: ON

ON

COOLING FAN

• Engine: After warming up, idle the 

engine

• Air conditioner switch: OFF

Engine coolant temperature is 97

°C 

(207

°F) or less

OFF

Engine coolant temperature between 
98

°C (208°F) and 99°C (210°F) or more

LOW

Engine coolant temperature between 
100

°C (212°F) or more

HIGH

• Engine: After warming up, idle the 

engine

• Air conditioner switch: ON
• Refrigerant pressure is less than 

1,280 kPa (12.80 bar, 13.05 kg/
cm

2

, 185.6 psi)

Engine coolant temperature is 97

°C 

(207

°F) or less

ON

Engine coolant temperature between 
97

°C (207°F) and 99°C (210°F) or more

MID

Engine coolant temperature between 
100

°C (212°F) or more

HIGH

HO2S2 HTR (B1)

• Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

ON

• Engine speed: Above 3,600 rpm

OFF

I/P PULLY SPD

• Vehicle speed: More than 20 km/h (12 MPH)

Almost the same speed as 
the tachometer indication

VEHICLE SPEED

• Turn drive wheels and compare CONSULT-III value with the speedometer in-

dication.

Almost the same speed as 
the speedometer indication

IDL A/V LEARN

• Engine: running

Idle air volume learning has not been per-
formed yet.

YET

Idle air volume learning has already been 
performed successfully.

CMPLT

TRVL AFTER MIL

• Ignition switch: ON

Vehicle has traveled after MIL has turned 
ON.

0 - 65,535 km
(0 - 40,723 miles)

A/F S1 HTR(B1)

• Engine: After warming up, idle the engine

(More than 140 seconds after starting engine.)

4 - 100%

AC PRESS SEN

• Engine: Idle
• Both A/C switch and blower fan switch: ON (Compressor operates)

1.0 - 4.0V

VHCL SPEED SE

• Turn drive wheels and compare CONSULT-III value with the speedometer in-

dication.

Almost the same speed as 
the speedometer indication

SET VHCL SPD

• Engine: Running

ASCD: Operating

The preset vehicle speed is 
displayed

MAIN SW

• Ignition switch: ON

MAIN switch: Pressed

ON

MAIN switch: Released

OFF

CANCEL SW

• Ignition switch: ON

CANCEL switch: Pressed

ON

CANCEL switch: Released

OFF

RESUME/ACC SW

• Ignition switch: ON

RESUME/ACCELERATE switch: 
Pressed

ON

RESUME/ACCELERATE switch: Re-
leased

OFF

SET SW

• Ignition switch: ON

SET/COAST switch: Pressed

ON

SET/COAST switch: Released

OFF

Monitor Item

Condition

Values/Status