Infiniti Q45 (FY33). Manual — part 375
Trouble Diagnoses
WORK FLOW
CHECK IN
Listen to customer complaints or request. (Get symptoms)
NOTE:
If customer reports a “No Start” condition, request ALL
KEYS to be brought to the Dealer in case of a NATS mal-
function.
TROUBLE
KEY SERVICE REQUEST (Additional key ID registration)
H
Verify the security indicator.
INITIALIZATION
(Refer to CONSULT-II operation
manual IVIS/NVIS.)
E
Using the CONSULT-II program card for IVIS (NATS) check the
“SELF-DIAG RESULTS” with CONSULT-II.
F
Self-diagnostic results referring to IVIS (NATS), but no informa-
tion about engine self-diagnostic results is displayed on CON-
SULT-II.
Self-diagnostic results referring to IVIS (NATS) and “DON’T
ERASE BEFORE CHECKING ENG DIAG” are displayed on
CONSULT-II.
(This means that engine trouble data has been detected in
ECM.)
Turn ignition switch “OFF”.
Repair IVIS (NATS).
(If necessary, carry out “SELF-FUNCTION CHECK” or “C/U INI-
TIALIZATION” with CONSULT-II.)
Turn ignition switch “OFF”.
Turn ignition switch “ON”.
Repair IVIS (NATS) according to self-diagnostic results referring
to IVIS (NATS).
(If necessary, carry out “SELF-FUNCTION CHECK” or “C/U INI-
TIALIZATION” with CONSULT-II.)
Erase the IVIS (NATS) “SELF-DIAG RESULTS” by using CON-
SULT-II. (Touch “ERASE”)
Do not erase the IVIS (NATS) “SELF-DIAG RESULTS” by
using CONSULT-II.
Start the engine.
Check the engine “SELF-DIAG RESULTS” with CONSULT-II by
using the CONSULT-II generic program card.
(Engine diagnostic software included)
F
NG
Verify no lighting up of the security indicator.
OK
Repair engine control system (Refer to EC section.) when self-
diagnostic results except “NATS MALFUNCTION” are detected.
When only “NATS MALFUNCTION” is detected, erase the self-
diagnostic results and go to the next step.
CHECK OUT
Start the engine. Does the engine start properly?
OK
NG
Perform running test with CONSULT-II in engine “SELF-DIAG
RESULTS” mode.
Erase the IVIS (NATS) and engine “SELF-DIAG RESULTS” by
using the CONSULT-II program card for IVIS (NATS) and
generic program card.
NG Verify “NO DTC” displayed on the CONSULT-II screen.
OK
Start the engine.
CHECK OUT
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
IVIS (Infiniti Vehicle Immobilizer System — NATS)
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
EL-491
SYMPTOM MATRIX CHART 1
(Self-diagnosis related item)
SYMPTOM
Displayed “SELF-DIAG
RESULTS” on CONSULT-II
screen.
DIAGNOSTIC PROCE-
DURE
(Reference page)
SYSTEM
(Malfunctioning
part or mode)
REFERENCE PART NO.
OF ILLUSTRATION ON
NEXT PAGE
I
Security indicator lighting
up*
I
Engine will start.
IMMU
PROCEDURE 1
IMMU
A
ECM
PROCEDURE 2
ECM
B
I
Security indicator lighting
up*
I
Engine hard to start
CHAIN OF ECM-IMMU
PROCEDURE 3
Open circuit in battery volt-
age line of IMMU circuit
C1
Open circuit in ignition line
of IMMU circuit
C2
Open circuit in ground line
of IMMU circuit
C3
Open circuit in communica-
tion line between IMMU and
ECM
C4
Short circuit between IMMU
and ECM communication
line and battery voltage line
C4
Short circuit between IMMU
and ECM communication
line and ground line
C4
Open circuit in power
source line of ANT/AMP cir-
cuit
E3
ECM
B
IMMU
A
DIFFERENCE OF KEY
PROCEDURE 4
Unregistered key
D
IMMU
A
CHAIN OF IMMU-KEY
PROCEDURE 5
Communication line
between ANT/AMP and
IMMU:
Open circuit or short circuit
of battery voltage line or
short circuit of ground line
E1
E2
Open circuit in power
source line of ANT/AMP cir-
cuit
E3
Open circuit in ground line
of ANT/AMP circuit
E4
Malfunction of key ID chip
E5
IMMU
A
Antenna amp.
E6
*: When IVIS (NATS) detects trouble, the security indicator lights up while ignition key is in the “ON” position.
IVIS (Infiniti Vehicle Immobilizer System — NATS)
Trouble Diagnoses (Cont’d)
EL-492
SYMPTOM
Displayed “SELF-DIAG
RESULTS” on CONSULT-II
screen.
DIAGNOSTIC PROCE-
DURE
(Reference page)
SYSTEM
(Malfunctioning
part or mode)
REFERENCE PART NO.
OF ILLUSTRATION ON
NEXT PAGE
I
Security indicator lighting
up*
I
Engine hard to start
ID DISCORD, IMM-ECM
PROCEDURE 6
System initialisation has not
yet been completed.
F
ECM
F
ELECTRONIC/MINGLE
NOISE
PROCEDURE 7
Noise interference in com-
munication line
—
LOCK MODE
PROCEDURE 9
LOCK MODE
D
I
MIL staying ON
I
Security indicator lighting
up*
DON’T ERASE BEFORE
CHECKING ENG DIAG
WORK FLOW
Engine trouble data and
IVIS (NATS) trouble data
have been detected in ECM
—
*: When IVIS (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)
SYMPTOM
DIAGNOSTIC PROCEDURE
(Reference page)
SYSTEM
(Malfunctioning part or mode)
Security ind. does not light up.
PROCEDURE 8
Security ind.
Open circuit between Fuse and IVIS (NATS)
IMMU
Continuation of initialization mode
IVIS (NATS) IMMU
DIAGNOSTIC SYSTEM DIAGRAM
SEL033VA
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
IDX
IVIS (Infiniti Vehicle Immobilizer System — NATS)
Trouble Diagnoses (Cont’d)
EL-493
SEL951W
DIAGNOSTIC PROCEDURE 1
Self-diagnostic results:
“IMMU” displayed on CONSULT-II screen
Confirm SELF-DIAGNOSTIC RESULTS “IMMU” displayed on CON-
SULT-II screen.
Ref. part No.* A.
Yes
Replace IMMU.
Perform initialisation with CONSULT-II.
For the operation of initialization, refer to “CONSULT-II operation
manual IVIS/NVIS”.
* Ref. part No.: reference part No. of Diagnostic System Diagram on EL-493.
SEL952W
DIAGNOSTIC PROCEDURE 2
Self-diagnostic results:
“ECM” displayed on CONSULT-II screen
Confirm SELF-DIAGNOSTIC RESULTS “ECM” displayed on CON-
SULT-II screen.
Ref. part No. B.
Replace ECM.
Perform initialization with CONSULT-II.
For the operation of initialization, refer to “CONSULT-II operation
manual IVIS/NVIS”.
IVIS (Infiniti Vehicle Immobilizer System — NATS)
Trouble Diagnoses (Cont’d)
H
H
H
H
EL-494
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