ecm NISSAN VERSA 2006 Workshop Service Owner's Guide

NATS (NISSAN ANTI-THEFT SYSTEM)
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System DescriptionEIS0093O
DESCRIPTION
NOTE:
If customer reports a “No start” condition, request ALL KEYS to be brought to a Nissan dealer in case
of a NATS malfunction.
NATS (Nissan Anti-Theft System) has the following functions:

NATS shows a higher anti-theft performance at preventing engine to be started by an unregistered key.
(registered key: mechanical key and Intelligent Key).

Only a key with key ID registered in BCM and ECM can start engine, it has a higher protection against
auto theft that duplicates keys.

If a malfunction has been detected, security indicator will illuminate when ignition switch is in ON position.

If the owner requires, mechanical key can be registered for up to 5 keys.

During trouble diagnosis or when the following parts have been replaced, and if mechanical key is added,
registration* is required.
*: All mechanical keys of the vehicle should be registered.
–ECM
–BCM
–Mechanical key

NATS trouble diagnoses, system initialization and additional registration of other NATS mechanical key
IDs must be carried out using CONSULT-II hardware and CONSULT-II NATS software. When NATS ini-
tialization has been completed, the ID of the inserted mechanical key can be displayed.
Regarding the procedures of NATS initialization and mechanical key ID registration, refer to CONSULT-II
operation manual NATS.
SECURITY INDICATOR

Forewarns that the vehicle is equipped with NATS.

Security indicator will not blink while the ignition knob is in ON or START state.
NOTE:
Because security indicator is highly efficient, the battery is barely affected.
Condition of Security Indicator

When operating the ignition switch with Intelligent Key, security indicator lamp will turn off at once if igni-
tion switch is pressed and blinks when ignition switch is released.

When operating the ignition switch with mechanical key security indicator will turn off at once if mechani-
cal key is inserted into key cylinder and blinks when mechanical key is removed.
(Once the mechanical key is inserted into key cylinder, BCM will only perform the key ID verification with
mechanical key)
System CompositionEIS0093P
The function of the NATS consists of the following:

Mechanical key

NATS antenna amp. located in the ignition key cylinder

BCM

ECM (Engine control module)

Security indicator

Intelligent Key unit (if equipped)

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NATS (NISSAN ANTI-THEFT SYSTEM)
Revision: June 20062007 Versa
NOTE:
The communication between ECM, BCM and/or Intelligent Key unit uses the CAN communication sys-
tem.
ECM Re-communicating FunctionEIS0093Q
Performing the following procedure can automatically perform re-communication of ECM and BCM or Intelli-
gent Key unit, but only when the ECM has been replaced with a new one which has never been energized on-
board.
(In this step, initialization procedure by CONSULT-II is not necessary)
NOTE:

When registering new Key IDs or replacing the ECM other than brand new, refer to CONSULT-II
Operation Manual NATS.

If multiple keys are attached to the key holder, separate them before work.

Distinguish keys with unregistered key ID from those with registered ID.
1. Install ECM.
2. Use a registered key (*), turn ignition switch to “ON”.
*: To perform this step, use the key that has been used before to perform ECM replacement.
3. Maintain ignition switch in “ON” position for at least 5 seconds.
4. Turn ignition switch to “OFF”.
5. Start engine.
If engine can be started, procedure is completed.
If engine cannot be started, refer to CONSULT-II Operation Manual NATS and initialize control unit.
LIIA2637E

NATS (NISSAN ANTI-THEFT SYSTEM)
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8. Perform each diagnostic test mode according to each service
procedure.
For further information, see the CONSULT-II Operation Manual
NATS.
CONSULT-II DIAGNOSTIC TEST MODE FUNCTION
*: When replace ECM, refer to BL-214, "ECM Re-communicating Function" .
NOTE:

When any initialization is performed, all ID previously registered will be erased and all NATS mechanical
keys must be registered again.

The engine cannot be started with an unregistered key. In this case, the system will show “DIFFERENCE
OF KEY” or “LOCK MODE” as a self-diagnostic result on the CONSULT-II screen.

In rare case, “CHAIN OF ECM-IMMU” might be stored as a self-diagnostic result during key registration
procedure, even if the system is not malfunctioning.
HOW TO READ SELF-DIAGNOSTIC RESULTS
SEL150X
CONSULT-II DIAGNOSTIC TEST
MODEDescription
C/U INITIALIZATIONWhen replacing any of the following components, C/U initialization and re-registration of all
NATS mechanical keys are necessary.
[NATS mechanical key/ BCM/ ECM*]
SELF-DIAG RESULTSDetected items (screen terms) are as shown in the chart.
Refer to BL-218, "
NATS SELF-DIAGNOSTIC RESULTS ITEM CHART" .
PIIA1124E

BL-218
NATS (NISSAN ANTI-THEFT SYSTEM)
Revision: June 20062007 Versa
NATS SELF-DIAGNOSTIC RESULTS ITEM CHART
Detected items
[NATS program card screen terms]P No. Code
(Self-diagnostic
result of
“ENGINE”)Malfunction is detected when.....Reference
page
CHAIN OF ECM-IMMU
[P1612]NATS MAL-
FUNCTION
P1612Communication impossible between ECM and BCM
In rare case, “CHAIN OF ECM-IMMU” might be stored
during key registration procedure, even if the system is
not malfunctioning.BL-223
CHAIN OF IMMU-KEY
[P1614]NATS MAL-
FUNCTION
P1614BCM cannot receive the key ID signal.BL-225
ID DISCORD, IMM-ECM
[P1611]NATS MAL-
FUNCTION
P1611The result of ID verification between BCM and ECM is
NG. System initialization is required.BL-227
LOCK MODE
[P1610]NATS MAL-
FUNCTION
P1610When the starting operation is carried out five or more
times consecutively under the following conditions, NATS
will shift the mode to one which prevents the engine from
being started.

Unregistered mechanical key is used.

BCM or ECM’s malfunctioning.BL-229
DON'T ERASE BEFORE CHECK-
ING ENG DIAG—All engine trouble codes except NATS trouble code has
been detected in ECM.BL-220

BL-222
NATS (NISSAN ANTI-THEFT SYSTEM)
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Trouble DiagnosesEIS0093X
SYMPTOM MATRIX CHART 1
Self-diagnosis related item

*: When NATS detects trouble, the security indicator lights up while ignition key is in the “ON” position.
SYMPTOM MATRIX CHART 2
Non self-diagnosis related item
*: CONSULT-II self-diagnostic results display screen “no malfunction is detected”. SYMPTOMDisplayed “SELF-DIAG
RESULTS” on CON-
SULT-II screen.DIAGNOSTIC PROCE-
DURE
(Reference page)SYSTEM
(Malfunctioning part or mode)

Security indicator
lighting up*

Engine cannot be
startedCHAIN OF ECM-IMMU
[P1612]PROCEDURE 1
(BL-223
)In rare case, “CHAIN OF ECM-IMMU” might be stored
during key registration procedure, even if the system is
not malfunctioning.
Open circuit in battery voltage line of BCM circuit
Open circuit in ignition line of BCM circuit
Open circuit in ground line of BCM circuit
Open or short circuit between BCM and ECM commu-
nication line
ECM
BCM
CHAIN OF IMMU-KEY
[P1614]PROCEDURE 2
(BL-225
)Malfunction of key ID chip
Communication line between ANT/ AMP and BCM:
Open circuit or short circuit of battery voltage line or
ground line
Open circuit in power source line of ANT/ AMP circuit
Open circuit in ground line of ANT/ AMP circuit
NATS antenna amp.
BCM
ID DISCORD, IMM-
ECM
[P1611]PROCEDURE 3
(BL-227
)System initialization has not yet been completed.
ECM
LOCK MODE
[P1610]PROCEDURE 5
(BL-229
)When the starting operation is carried out five or more
times consecutively under the following conditions,
NATS will shift the mode to one which prevents the
engine from being started.

Unregistered ignition key is used.

BCM or ECM’s malfunctioning.
Security indicator
lighting up*DON'T ERASE
BEFORE CHECKING
ENG DIAGWORK FLOW
(BL-220
)Engine trouble data and NATS trouble data have been
detected in ECM
SYMPTOMDIAGNOSTIC PROCEDURE
(Reference page)SYSTEM
(Malfunctioning part or mode)
Security indicator does not light up*.PROCEDURE 4
(BL-228
)Security indictor.
Open circuit between Fuse and BCM
BCM

NATS (NISSAN ANTI-THEFT SYSTEM)
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Diagnostic Procedure 1EIS0093Y
Self-diagnostic results:
“CHAIN OF ECM-IMMU” displayed on CONSULT-II screen
First perform the “SELF-DIAG RESULTS” in “BCM” with CONSULT-II, then perform the trouble diagno-
sis of malfunction system indicated “SELF-DIAG RESULTS” of “BCM”. Refer to BCS-18, "
CAN Com-
munication Inspection Using CONSULT-II (Self-Diagnosis)" .
1. CONFIRM SELF-DIAGNOSTIC RESULTS
Confirm SELF-DIAGNOSTIC RESULTS “CHAIN OF ECM-IMMU”
displayed on CONSULT-II screen.
NOTE:
In rare case, “CHAIN OF ECM-IMMU” might be stored during key
registration procedure, even if the system is not malfunctioning.
Is CONSULT-II screen displayed as shown in figure?
Yes >> GO TO 2.
No >> GO TO BL-222, "
SYMPTOM MATRIX CHART 1" .
2. CHECK POWER SUPPLY CIRCUIT FOR BCM
1. Turn ignition switch OFF.
2. Check voltage between BCM and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 3.
NG >> Check the following.

40A fusible link (letter g , located in the fuse and fus-
ible link box).

10A fuse [No.8, located in the fuse block (J/B)].

Harness for open or short between fusible link and BCM.

Harness for open or short between fuse and BCM.
3. CHECK IGNITION SWITCH ON SIGNAL
1. Turn ignition switch ON.
2. Check voltage between BCM connector and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> Check the following.

10A fuse [No. 6, located in the fuse block (J/B)].

Harness for open or short between fuse and BCM.
PIIA1260E
BCM connectorTe r m i n a l s
Voltage [V]
(Approx.)
(+) (–)
M2057
Ground Battery voltage
70
PIIB6582E
BCM connectorTe r m i n a l
Voltage [V]
(Approx.)
(+) (–)
M18 38 Ground Battery voltage
PIIB6587E

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NATS (NISSAN ANTI-THEFT SYSTEM)
Revision: June 20062007 Versa
4. CHECK GROUND CIRCUIT FOR BCM
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between BCM connector and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness.
5. REPLACE BCM
1. Replace BCM
2. Perform initialization with CONSULT-II.
For initialization, refer to “CONSULT-II Operation Manual NATS”.
Does the engine start?
Yes >> BCM is malfunctioning.

Replace BCM. Refer to BCS-25, "Removal and Installation of BCM" .

Perform initialization with CONSULT-II

For initialization, refer to “CONSULT-II Operation Manual NATS”
No >> ECM is malfunctioning.

Replace ECM.

Perform initialization or re-communicating function

For initialization, refer to “CONSULT-II Operation Manual NATS”

For re-communicating function, refer to BL-214, "ECM Re-communicating Function"
BCM connectorTe r m i n a l
Continuity
(+) (–)
M20 67 Ground Yes
PIIB6588E

NATS (NISSAN ANTI-THEFT SYSTEM)
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Diagnostic Procedure 3EIS00940
Self-diagnostic results:
“ID DISCORD, IMM-ECM” displayed on CONSULT-II screen
1. CONFIRM SELF-DIAGNOSTIC RESULTS
Confirm SELF-DIAGNOSTIC RESULTS “ID DISCORD, IMM-ECM” displayed on CONSULT-II screen.
NOTE:
“ID DISCORD IMM-ECM”:
Registered ID of BCM is in discord with that of ECM.
Is CONSULT-II screen displayed as shown in figure?
Yes >> GO TO 2.
No >> GO TO BL-222, "
SYMPTOM MATRIX CHART 1" .
2. PERFORM INITIALIZATION WITH CONSULT-II
Perform initialization with CONSULT-II. Re-register all NATS ignition key IDs.
For initialization, refer to “CONSULT-II Operation Manual NATS”.
NOTE:
If the initialization is not completed or malfunctions, CONSULT-II
shows message on the screen.
Can the system be initialized?
Ye s > >
Start engine. (END)

(System initialization had not been completed.)
No >> ECM is malfunctioning.

Replace ECM.

Perform initialization with CONSULT-II
For initialization, refer to “CONSULT-II Operation
Manual NATS”
PIIA1262E
SEL297W

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NATS (NISSAN ANTI-THEFT SYSTEM)
Revision: June 20062007 Versa
4. PERFORM INITIALIZATION WITH CONSULT-II AGAIN
1. Replace BCM.
2. Perform initialization with CONSULT-II.
For initialization, refer to “CONSULT-II Operation Manual
NATS”.
NOTE:
If the initialization is not completed or malfunctions, CONSULT-II
shows the message on the screen.
Can the system be initialized?
Yes >> System is OK. (BCM is malfunctioning.)
No >> ECM is malfunctioning.

Replace ECM.

Perform initialization with CONSULT-II

For initialization, refer to “CONSULT-II Operation
Manual NATS”
How to Replace NATS Antenna Amp.EIS00943
NOTE:

If NATS antenna amp. is not installed correctly, NATS sys-
tem will not operate properly and SELF-DIAG RESULTS on
CONSULT-II screen will show “LOCK MODE” or “CHAIN OF
IMMU-KEY”.

Initialization is not necessary only when NATS antenna
amp. is replaced with a new one.
SEL297W
PIIB6539E

BRC-22
[ABS]
TROUBLE DIAGNOSIS
Revision: June 20062007 Versa
Note 1: If wheel sensor 2 for each wheel is indicated, check ABS actuator and electric unit (control unit) power supply voltage in addition
to wheel sensor circuit check.
Note 2: If multiple malfunctions are detected including CAN communication line [U1000], perform diagnosis for CAN communication line
first.
DATA MONITOR
Operation Procedure
1. After turning OFF the ignition switch, connect CONSULT-II and the CONSULT-II CONVERTER to the data
link connector.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
2. Touch “START (NISSAN BASED VHCL)”, “ABS”, “DATA MONITOR” in order on the CONSULT-II screen.
If “ABS” is not indicated, go to GI-40, "
CONSULT-II Data Link Connector (DLC) Circuit" .
CAUTION:
When “START (NISSAN BASED VHCL)” is touched immediately after starting the engine or turning
on the ignition switch, “ABS” might not be displayed in the SELECT SYSTEM screen. In this case,
repeat the operation from step 2.
3. Return to the SELECT MONITOR ITEM screen, and touch “ECU INPUT SIGNALS”, “MAIN SIGNALS” or
“SELECTION FROM MENU”. Refer to the following information.
4. When “START” is touched, the data monitor screen is displayed.
FR LH IN ABS SOL
[C1120]Circuit of front LH IN ABS solenoid is open or shorted, or control
line is open or shorted to power supply or ground.
BRC-27, "
Solenoid Valve
System Inspection"
FR LH OUT ABS SOL
[C1121]Circuit of front LH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.
FR RH IN ABS SOL
[C1122]Circuit of front RH IN ABS solenoid is open or shorted, or control
line is open or shorted to power supply or ground.
FR RH OUT ABS SOL
[C1123]Circuit of front RH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.
RR LH IN ABS SOL
[C1124]Circuit of rear LH IN ABS solenoid is open or shorted, or control
line is open or shorted to power supply or ground.
RR LH OUT ABS SOL
[C1125] Circuit of rear LH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.
RR RH IN ABS SOL
[C1126] Circuit of rear RH IN ABS solenoid is open or shorted, or control
line is open or shorted to power supply or ground.
RR RH OUT ABS SOL
[C1127] Circuit of rear RH OUT ABS solenoid is open or shorted, or con-
trol line is open or shorted to power supply or ground.
MAIN RELAY
[C1114]ABS actuator relay or circuit malfunction.BRC-28, "
Actuator
Motor, Motor Relay, and
Circuit Inspection"
CAN COMM CIRCUIT
[U1000]

CAN communication line is open or shorted.

ABS actuator and electric unit (control unit) internal malfunc-
tion

Battery voltage for ECM is suddenly interrupted for approxi-
mately 0.5 second or more.BRC-29, "
CAN Commu-
nication System Inspec-
tion" (Note 2) Self-diagnostic item Malfunction detecting condition Check system