Infiniti G37 Coupe. Manual — part 1136
P1612 CHAIN OF ECM-IMMU
SEC-41
< COMPONENT DIAGNOSIS >
[INTELLIGENT KEY SYSTEM]
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P1612 CHAIN OF ECM-IMMU
Description
INFOID:0000000001699936
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:0000000001699937
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.
A/T models
-
A/T selector lever is in the P or N position
-
Do not depress brake pedal
M/T models
-
Do not depress clutch pedal
2.
Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001699938
1.
REPLACE BCM
1.
Replace BCM. Refer to
BCS-79, "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
1.
Replace ECM.
2.
EC-16, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : Description"
>> 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-42
< COMPONENT DIAGNOSIS >
[INTELLIGENT KEY SYSTEM]
P1614 CHANIN OF IMMU-KEY
P1614 CHANIN OF IMMU-KEY
Description
INFOID:0000000001699927
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:0000000001699928
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
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
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:0000000001699929
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.
NO
>> GO TO 3.
3.
CHECK KEY SLOT CIRCUIT
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1614
CHANIN OF IMMU-
KEY
Inactive communication between key slot and
BCM.
• Harness or connectors
(The key slot circuit is open or
shorted)
• Key slot
• BCM
Key slot
Ground
Voltage [V]
(approx.)
Connector
Terminal
M22
2
Ground
Battery voltage
P1614 CHANIN OF IMMU-KEY
SEC-43
< COMPONENT DIAGNOSIS >
[INTELLIGENT KEY SYSTEM]
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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
>> GO TO 8.
NO
>> Repair harness or connector.
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.
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
>> GO TO 8.
NO
>> Repair harness or connector.
7.
CHECK KEY SLOT GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect key slot connector.
3.
Check continuity between key slot harness connector and ground.
Key slot
BCM
Continuity
Connector
Terminal
Connector
Terminal
M22
2
M122
80
Existed
Key slot
Ground
Continuity
Connector
Terminal
M22
2
Ground
Not existed
Key slot
Ground
Voltage [V]
(approx.)
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
Ground
Not existed
SEC-44
< COMPONENT DIAGNOSIS >
[INTELLIGENT KEY SYSTEM]
P1614 CHANIN OF IMMU-KEY
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
8.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
>> INSPECTION END
Key slot
Ground
Continuity
Connector
Terminal
M22
7
Ground
Existed
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