Nissan Altima L32. Instruction — part 341
ECM
EC-485
< ECU DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
C
D
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ECU DIAGNOSIS
ECM
Reference Value
INFOID:0000000004349550
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
B/FUEL SCHDL
See
A/F ALPHA-B1
See
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
HO2S3(B1)
• Revving engine from idle up to 3,000 rpm quickly after the following conditions
are met.
- Engine: After warming up
- Driving for 3 minutes at a speed of 80 km/h (50 MPH) or more
(Keep the vehicle speed as steady as possible during the cruising.)
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
EC-486
< ECU DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
ECM
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
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
Monitor Item
Condition
Values/Status
ECM
EC-487
< ECU DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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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%
SWRL CONT S/V
• Ignition switch: ON
• Engine coolant temperature: Be-
tween 5
°C (41°F) and 40°C
(104
°F)
Accelerator pedal: Fully released
ON
Accelerator pedal: Slightly depressed
OFF
AIR COND RLY
• Engine: After warming up, idle the
engine
Air conditioner switch: OFF
OFF
Air conditioner switch: ON
(Compressor operates)
ON
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
HO2S3 HTR(B1)
• Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Driving for 3 minutes at a speed of 80 km/h (50 MPH) or more
(Keep the vehicle speed as steady as possible during the cruising.)
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
Monitor Item
Condition
Values/Status
EC-488
< ECU DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
ECM
*1: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ
from ECM terminals voltage signal.
*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to
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
BRAKE SW1
(ASCD brake switch)
• Ignition switch: ON
• Brake pedal: Fully released (CVT)
• Brake pedal and clutch pedal: Fully re-
leased (M/T)
ON
• Brake pedal: Slightly depressed (CVT)
• Brake pedal and/or clutch pedal: Slight-
ly depressed (M/T)
OFF
BRAKE SW2
(Stop lamp switch)
• Ignition switch: ON
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
VHCL SPD CUT
• Ignition switch: ON
NON
LO SPEED CUT
• Ignition switch: ON
NON
AT OD MONITOR
• Ignition switch: ON
OFF
AT OD CANCEL
• Ignition switch: ON
OFF
CRUISE LAMP
• Ignition switch: ON
MAIN switch: Pressed at the 1st time
→
at the 2nd time
ON
→ OFF
SET LAMP
• MAIN switch: ON
• When vehicle speed: Between 40
km/h (25 MPH) and 144 km/h (89
MPH)
ASCD: Operating
ON
ASCD: Not operating
OFF
ALT DUTY
• Engine: Idle
0 - 80%
BAT CUR SEN
• Engine speed: Idle
• Battery: Fully charged*
2
• Shift lever: P or N (CVT), Neutral (M/T)
• Air conditioner switch: OFF
• No load
Approx. 2,600 - 3,500mV
ALT DUTY SIG
• Power generation voltage variable control: Operating
ON
• Power generation voltage variable control: Not operating
OFF
A/F ADJ-B1
• Engine: running
–0.330 - 0.330
TMBL POS SEN
• Ignition switch: ON
• Engine coolant temperature: Be-
tween 5
°C (41°F) and 60°C
(140
°F)
Accelerator pedal: Fully released
Less than 1.2V
Accelerator pedal: Slightly depressed
More than 2.9V
Monitor Item
Condition
Values/Status
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