Infiniti FX35, FX50 (S51). Manual — part 1656
P1612 CHAIN OF ECM-IMMU
SEC-37
< DTC/CIRCUIT DIAGNOSIS >
[INTELLIGENT KEY SYSTEM]
C
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SEC
N
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P
P1612 CHAIN OF ECM-IMMU
Description
INFOID:0000000005249428
BCM performs the ID verification with ECM that allows the engine to start. Start the engine if the ID is OK.
ECM prevents the engine from starting if the ID is not registered. BCM starts the communication with ECM if
ignition switch is turned ON.
DTC Logic
INFOID:0000000005249429
DTC DETECTION LOGIC
NOTE:
• If DTC P1612 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
• If DTC P1612 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON under the following conditions.
-
Selector lever is in the P or N position.
-
Do not depress brake pedal.
2.
Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005249430
1.
REPLACE BCM
1.
Replace BCM. Refer to
BCS-83, "Removal and Installation"
.
2.
Perform initialization with CONSULT-III.
For initialization, refer to “CONSULT-III Operation Manual NATS-IVIS/NVIS”.
Does the engine start?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE ECM
Replace ECM. Refer to
EC-20, "BASIC INSPECTION : Special Repair Requirement"
"BASIC INSPECTION : Special Repair Requirement"
(VK50VE).
>> INSPECTION END
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1612
CHAIN OF ECM-IMMU
Inactive communication between ECM and BCM
• Harness or connectors
(The CAN communication line is open or
shorted)
• BCM
• ECM
SEC-38
< DTC/CIRCUIT DIAGNOSIS >
[INTELLIGENT KEY SYSTEM]
P1614 CHAIN OF IMMU-KEY
P1614 CHAIN OF IMMU-KEY
Description
INFOID:0000000005249431
Performs ID verification through BCM and Intelligent Key when push-button ignition switch is pressed.
Prohibits the release of steering lock or start of engine when an unregistered ID of Intelligent Key is used.
DTC Logic
INFOID:0000000005249432
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE 1
1.
Insert Intelligent Key into the key slot.
2.
Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES
>> Go to
NO
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE 2
1.
Press the push-button ignition switch.
2.
Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005249433
1.
INSPECTION START
Check the case in which DTC is detected.
• Case1: It is detected when Intelligent Key is inserted into key slot.
• Case2: It is detected after Intelligent Key is inserted into key slot and push-button ignition switch is pressed.
In which case is DTC detected?
Case1. >> GO TO 2.
Case2. >> GO TO 4.
2.
CHECK KEY SLOT INPUT SIGNAL
1.
Turn ignition switch OFF.
2.
Disconnect key slot connector.
3.
Check voltage between key slot harness connector and ground.
Is the inspection result normal?
YES
>> Replace key slot. Refer to
SEC-219, "Removal and Installation"
NO
>> GO TO 3.
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1614
CHAIN OF IMMU-
KEY
Inactive communication between key slot and
BCM.
• Harness or connectors
(The key slot circuit is open or
shorted)
• Key slot
• BCM
(+)
(–)
Voltage (V)
(Approx.)
Key slot
Connector
Terminal
M22
2
Ground
Battery voltage
P1614 CHAIN OF IMMU-KEY
SEC-39
< DTC/CIRCUIT DIAGNOSIS >
[INTELLIGENT KEY SYSTEM]
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3.
CHECK KEY SLOT CIRCUIT
1.
Disconnect BCM connector M122.
2.
Check continuity between key slot harness connector and BCM harness connector.
3.
Check continuity between key slot harness connector and ground.
Is the inspection result normal?
YES
>> Replace BCM. Refer to
BCS-83, "Removal and Installation"
NO
>> Repair or replace harness.
4.
CHECK PUSH-BUTTON IGNITION SWITCH OPERATION
Press push-button ignition switch and check if it turns ON.
Does ignition switch turn to ON?
YES
>> GO TO 5.
NO
>> GO TO 7.
5.
CHECK KEY SLOT COMMUNICATION SIGNAL
1.
Turn ignition switch OFF.
2.
Disconnect key slot connector.
3.
Check voltage between key slot harness connector and ground.
Is the inspection result normal?
YES
>> Replace key slot. Refer to
SEC-219, "Removal and Installation"
NO
>> GO TO 6.
6.
CHECK KEY SLOT COMMUNICATION SIGNAL CIRCUIT
1.
Disconnect BCM connector M122.
2.
Check continuity between key slot harness connector and BCM harness connector.
3.
Check continuity between key slot harness connector and ground.
Is the inspection result normal?
YES
>> Replace BCM. Refer to
BCS-83, "Removal and Installation"
NO
>> Repair or replace harness.
7.
CHECK KEY SLOT GROUND CIRCUIT
Key slot
BCM
Continuity
Connector
Terminal
Connector
Terminal
M22
2
M122
80
Existed
Key slot
Ground
Continuity
Connector
Terminal
M22
2
Not existed
(+)
(–)
Voltage (V)
(Approx.)
Key slot
Connector
Terminal
M22
3
Ground
Battery voltage
Key slot
BCM
Continuity
Connector
Terminal
Connector
Terminal
M22
3
M122
81
Existed
Key slot
Ground
Continuity
Connector
Terminal
M22
3
Not existed
SEC-40
< DTC/CIRCUIT DIAGNOSIS >
[INTELLIGENT KEY SYSTEM]
P1614 CHAIN OF IMMU-KEY
1.
Turn ignition switch OFF.
2.
Disconnect key slot connector.
3.
Check continuity between key slot harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair or replace harness.
8.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
>> INSPECTION END
Key slot
Ground
Continuity
Connector
Terminal
M22
7
Existed
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