NATS / Gasoline engine — Trouble Diagnoses (Cont'd) — Diagnostic Procedure 2 ("CHAIN OF ECM-IMMU")
EL-7066flowchartIMMU connector M146 pin map for this procedure: pin 8 = battery; pin 7 = ignition; pin 4 = ground; pin 1 = NATS comm to ECM pin 88. ECM-side NATS pin is 88. Fuse [20] is the 10A IMMU battery fuse; fuse [25] is the 10A IMMU ignition fuse.
NATS (Nissan Anti-Theft System) / Gasoline engine
Trouble Diagnoses (Cont'd)
DIAGNOSTIC PROCEDURE 2
NOTE
Self-diagnostic results: "CHAIN OF ECM-IMMU" displayed on CONSULT-II screen.
*: In rare case, "CHAIN OF ECM-IMMU" might be stored during key registration procedure, even if the system is not malfunctioning.
1
A — Confirm SELF-DIAGNOSTIC RESULTS "CHAIN OF ECM-IMMU"* displayed on CONSULT-II screen.
OK
2
B — CHECK POWER SUPPLY CIRCUIT FOR IMMU. Check voltage between terminal ⑧ of IMMU and ground. Voltage: Battery voltage.
NG
Check the following: • 10A fuse [No. ⑳, located in the fuse block (J/B)]. • Harness for open or short between fuse and IMMU connector. Ref. part No. C1.
OK
3
C — CHECK IGN SW. ON SIGNAL. Check voltage between terminal ⑦ of IMMU and ground while ignition switch is in the "ON" position. Voltage: Battery voltage.
NG
Check the following: • 10A fuse [No. ㉕, located in the fuse block (J/B)]. • Harness for open or short between fuse and IMMU connector. Ref. part No. C2.
OK
4
D — CHECK GROUND CIRCUIT FOR IMMU. Check harness continuity between IMMU terminal ④ and ground. Continuity should exist.
NG
Repair harness. Ref. part No. C3.
OK
5
E — CHECK COMUNICATION ON OPEN CIRCUIT. Check harness continuity between ECM terminal ㊵ or IMMU terminal ①. Continuity should exist.
NG
Repair harness. Ref. part No. C4.
OK
6
(A) → continue on next page (EL-7067).