Nissan Titan. Instruction — part 187
DIAGNOSIS SYSTEM (ECM)
EC-49
< SYSTEM DESCRIPTION >
[VK56DE]
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A particular trouble code can be identified by the number of four-digit numeral flashes per the following.
The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-sec-
onds) - OFF (0.6-seconds) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-seconds ON and 0.3-seconds OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-seconds OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-
function. Refer to
How to Erase Self-diagnostic Results
By performing this procedure, ECM memory is erased and the following diagnostic information is erased as
well.
• Diagnostic trouble codes
• 1st trip diagnostic trouble codes
• Freeze frame data
• 1st trip freeze frame data
• System readiness test (SRT) codes
• Test values
NOTE:
Also, if a battery terminal is disconnected, ECM memory is erased and the diagnostic information as listed
above is erased. (The amount of time required for erasing may vary from a few seconds to several hours.)
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Set ECM in Self-diagnostic results.
6. The diagnostic information has been erased from the backup memory in the ECM.
Fully depress the accelerator pedal and keep it depressed for more than 10 seconds.
7. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.
CONSULT Function
INFOID:0000000009886512
FUNCTION
*: The following emission-related diagnostic information is cleared when the ECM memory is erased.
• Diagnostic trouble codes
• 1st trip diagnostic trouble codes
• Freeze frame data
• 1st trip freeze frame data
• System readiness test (SRT) codes
• Test values
Number
0
1
2
3
4
5
6
7
8
9
A
B
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Flashes
10
1
2
3
4
5
6
7
8
9
11
12
13
14
15
16
Diagnostic test mode
Function
Self Diagnostic Results
Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data
can be read and erased quickly.*
Data Monitor
Input/Output data in the ECM can be read.
Work support
This mode enables a technician to adjust some devices faster and more accurately by following the in-
dications on the CONSULT unit.
Active Test
Diagnostic Test Mode in which CONSULT drives some actuators apart from the ECMs and also shifts
some parameters in a specified range.
Ecu Identification
ECM part number can be read.
DTC Work Support
The status of system monitoring tests and the self-diagnosis status/result can be confirmed.
EC-50
< SYSTEM DESCRIPTION >
[VK56DE]
DIAGNOSIS SYSTEM (ECM)
SELF DIAGNOSTIC RESULTS MODE
Self Diagnostic Item
Regarding items of DTC and 1st trip DTC, refer to
How to Read DTC and 1st Trip DTC
DTCs and 1st trip DTCs related to the malfunction are displayed in “Self-diag results”.
• When ECM detects a 1st trip DTC, “1t” is displayed for “TIME”.
• When ECM has detected a current DTC, “0” is displayed for “TIME”.
• If “TIME” is neither “0” nor “1t”, the DTC occurred in the past and ECM shows the number of times the vehi-
cle has been driven since the last detection of the DTC.
How to Erase DTC and 1st Trip DTC
NOTE:
• If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again.
• If the DTC is not for A/T related items (see
), skip step 1.
1. Erase DTC in TCM. Refer to
2. Select “ENGINE” with CONSULT.
3. Select “SELF-DIAG RESULTS”.
4. Touch “ERASE”. (DTC in ECM will be erased.)
Freeze Frame Data and 1st Trip Freeze Frame Data
*: The item is the same as that of 1st trip freeze frame data.
DATA MONITOR MODE
Freeze frame data
item*
Description
DIAG TROUBLE
CODE
[PXXXX]
• The engine control component part/control system has a trouble code, it is displayed as PXXXX. (Refer to
.)
FUEL SYS-B1
• “Fuel injection system status” at the moment a malfunction is detected is displayed.
• One mode in the following is displayed.
Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop
FUEL SYS-B2
COMBUST CONDI-
TION
• These items are displayed but are not applicable to this model.
CAL/LD VALUE [%]
• The calculated load value at the moment a malfunction is detected is displayed.
COOLANT TEMP
[
°C] or [°F]
• The engine coolant temperature at the moment a malfunction is detected is displayed.
L-FUEL TRM-B1 [%]
• “Long-term fuel trim” at the moment a malfunction is detected is displayed.
• The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than
short-term fuel trim.
L-FUEL TRM-B2 [%]
S-FUEL TRM-B1 [%]
• “Short-term fuel trim” at the moment a malfunction is detected is displayed.
• The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel sched-
ule.
S-FUEL TRM-B2 [%]
ENGINE SPEED [rpm] • The engine speed at the moment a malfunction is detected is displayed.
VEHICL SPEED
[km/h] or [mph]
• The vehicle speed at the moment a malfunction is detected is displayed.
INT MANI PRES [kPa]
or [psi]
• These items are displayed but are not applicable to this model.
ABSOL TH-P/S
[%]
• The throttle valve opening at the moment a malfunction is detected is displayed.
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.
DIAGNOSIS SYSTEM (ECM)
EC-51
< SYSTEM DESCRIPTION >
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NOTE:
The following table includes information (items) inapplicable to this vehicle. For information (items) applicable
to this vehicle, refer to CONSULT display items.
Monitored Item
For reference values of the following items, refer to
EC-60, "CONSULT Reference Value in Data Monitor
.
Monitored item
[Unit]
ECM IN-
PUT SIG-
NALS
MAIN
SIGNALS
Description
Remarks
ENG SPEED [rpm]
×
×
• Indicates the engine speed computed
from the signal of the crankshaft position
sensor (POS) and camshaft position
sensor (PHASE).
• Accuracy becomes poor if engine speed
drops below the idle rpm.
• If the signal is interrupted while the en-
gine 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.
• When engine is running specification
range is indicated in “SPEC”.
B/FUEL SCHDL
[ms]
×
×
• Base fuel schedule indicates the fuel in-
jection pulse width programmed into
ECM, prior to any learned on board cor-
rection.
• When engine is running specification
range is indicated in “SPEC”.
A/F ALPHA-B1 [%]
• The mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.
• When the engine is stopped, a certain
value is indicated.
• When engine is running specification
range is indicated in “SPEC”.
• This data also includes the data for the
air-fuel ratio learning control.
A/F ALPHA-B2 [%]
COOLANT TEMP/
S [
°C] or [°F]
×
×
• The engine coolant temperature (deter-
mined by the signal voltage of the engine
coolant temperature sensor) is dis-
played.
• When the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant temperature determined by the ECM
is displayed.
A/F SEN1 (B1) [V]
×
×
• The A/F signal computed from the input
signal of the A/F sensor 1 is displayed.
HO2S2 (B1) [V]
×
×
• The signal voltage of the heated oxygen
sensor 2 is displayed.
HO2S2 (B2) [V]
×
×
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 af-
ter 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 sent from combina-
tion meter 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]
TP SEN 1-B1
×
×
• The throttle position sensor signal volt-
age is displayed.
• TP SEN 2-B1 signal is converted by
ECM internally. Thus, it differs from ECM
terminal voltage signal.
TP SEN 2-B1
×
×
FUEL T/TMP SE
[
°C] or [°F]
• The fuel temperature (determined by the
signal voltage of the fuel tank tempera-
ture sensor) is displayed.
EC-52
< SYSTEM DESCRIPTION >
[VK56DE]
DIAGNOSIS SYSTEM (ECM)
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 start signal status [ON/OFF]
computed by the ECM according to the
signals of engine speed and battery volt-
age.
• After starting the engine, [OFF] is dis-
played regardless of the starter signal.
CLSD THL POS
[ON/OFF]
×
×
• Indicates idle position [ON/OFF] comput-
ed by ECM according to the accelerator
pedal position sensor signal.
AIR COND SIG
[ON/OFF]
×
×
• Indicates [ON/OFF] condition of the air
conditioner switch as determined by the
air conditioner signal.
PW/ST SIGNAL
[ON/OFF]
×
×
• [ON/OFF] condition of the power steering
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: Lighting switch is in 2nd position.
OFF: Lighting switch is OFF.
IGNITION SW
[ON/OFF]
×
×
• Indicates [ON/OFF] condition from igni-
tion switch signal.
HEATER FAN SW
[ON/OFF]
×
• Indicates [ON/OFF] condition from heat-
er 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 indicated.
INJ PULSE-B2
[msec]
IGN TIMING [BT-
DC]
• Indicates the ignition timing computed by
ECM according to the input signals.
• When the engine is stopped, a certain
value is indicated.
CAL/LD VALUE [%]
• “Calculated load value” indicates the val-
ue of the current air flow divided by peak
air flow.
MASS AIRFLOW
[g/s]
• Indicates the mass air flow 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 val-
ue increases.
INT/V TIM(B1)
[
°CA]
• Indicates [
°CA] of intake camshaft ad-
vanced angle.
INT/V TIM(B2)
[
°CA]
Monitored item
[Unit]
ECM IN-
PUT SIG-
NALS
MAIN
SIGNALS
Description
Remarks
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