Case 7 Infiniti M45 II

Case 7

Check CAN communication circuit. Refer to " CAN COMMUNICATION CIRCUIT CHECK ".

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1. CHECK CONNECTOR Turn ignition switch OFF. Check following terminals and connector for damage, bend and loose connection (connector-side and harness-side). Harness connector M141 Harness connector B211 OK or NG OK >> GO TO 2. NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect harness connector M135 and harness connector M141. Check continuity between harness connector M135 terminals 46T (L), 45T (R) and harness connector M141 terminals 52V (L), 53V (R). 46T (L) - 52V (L) : Continuity should exist. 45T (R) - 53V (R) : Continuity should exist. OK or NG OK >> GO TO 3. NG >> Repair harness.
3. CHECK HARNESS FOR OPEN CIRCUIT Check continuity between harness connector B211 terminals 52V (L), 53V (R) and harness connector B211 terminals 66V (L), 61V (R). 52V (L) - 66V (L) : Continuity should exist. 53V (R) - 61V (R) : Continuity should exist. OK or NG OK >> GO TO 4. NG >> Repair harness.
4. CHECK HARNESS FOR OPEN CIRCUIT Check continuity between harness connector M141 terminals 66V (L), 61V (R) and data link connector M31 terminals 6 (L), 3 (R). 66V (L) - 6 (L) : Continuity should exist. 61V (R) - 3 (R) : Continuity should exist. OK or NG OK >> Connect all the connectors and diagnose again. Refer to " «WORK FLOW»(ref-181251-S35033917552005080300000) " NG >> Repair harness.

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1. CHECK CONNECTOR Turn ignition switch OFF. Check following terminals and connector for damage, bend and loose connection (control module-side and harness-side). ECM connector Harness connector F105 Harness connector M135 OK or NG OK >> GO TO 2. NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect ECM connector. Check resistance between ECM harness connector F102 terminals 174 (L) and 171 (R). 174 (L) - 171 (R) : Approx. 108 - 132ohm OK or NG OK >> Replace ECM. NG >> Repair harness between ECM and harness connector M141.

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1. CHECK CONNECTOR Turn ignition switch OFF. Check following terminals and connector for damage, bend and loose connection (control unit-side and harness-side). VDC/TCS/ABS control unit connector Harness connector E222 Harness connector M132 OK or NG OK >> GO TO 2. NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect VDC/TCS/ABS control unit connector. Check resistance between VDC/TCS/ABS control unit harness connector E218 terminals 61 (L) and 63 (R). 61 (L) - 63 (R) : Approx. 54 - 66ohm OK or NG OK >> Replace VDC/TCS/ABS control unit. NG >> Repair harness between VDC/TCS/ABS control unit and harness connector M141.

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1. CHECK CONNECTOR Turn ignition switch OFF. Check following terminals and connector for damage, bend and loose connection (control module-side and harness-side). TCM connector Harness connector F105 Harness connector M135 OK or NG OK >> GO TO 2. NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect TCM connector. Check resistance between TCM harness connector F103 terminals 6 (L) and 7 (R). 6 (L) - 7 (R) : Approx.54 -66ohm OK or NG OK >> Replace TCM. NG >> Repair harness between TCM and data link connector.

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1. CHECK CONNECTOR Turn ignition switch OFF. Check terminals and connector of steering angle sensor for damage, bend and loose connection (sensor-side and harness-side). OK or NG OK >> GO TO 2. NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect steering angle sensor connector. Check resistance between steering angle sensor harness connector M52 terminals 4 (L) and 5 (R). 4 (L) - 5 (R) : Approx. 54 - 66ohm OK or NG OK >> Replace steering angle sensor. NG >> Repair harness between steering angle sensor. and combination meter.

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1. CHECK CONNECTOR Turn ignition switch OFF. Check terminals and connector of combination meter for damage, bend and loose connection (meter-side and harness-side). OK or NG OK >> GO TO 2. NG >> Repair terminal or connector.
2. CHECK HARNESS FOR OPEN CIRCUIT Disconnect combination meter connector. Check resistance between combination meter harness connector M41 terminals 34 (L) and 35 (R). 34 (L) - 35 (R) : Approx. 108 - 13ohm OK or NG OK >> Replace combination meter. NG >> Repair harness between combination meter and steering angle sensor.

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1. CHECK CONNECTOR Turn ignition switch OFF. Check following terminals and connector for damage, bend and loose connection (control module-side, control unit-side, sensor-side, meter-side and harness- side). ECM VDC/TCS/ABS control unit TCM Steering angle sensor Combination meter Between ECM and TCM Between ECM and VDC/TCS/ABS control unit OK or NG OK >> GO TO 2. NG >> Repair terminal or connector.
2. CHECK HARNESS FOR SHORT CIRCUIT Disconnect ECM connector and harness connector F105. Check continuity between ECM harness connector F102 terminals 174 (L) and 171 (R). 174 (L) - 171 (R) : Continuity should not exist. OK or NG OK >> GO TO 3. NG >> Repair harness between ECM and harness connector F105.
3. CHECK HARNESS FOR SHORT CIRCUIT Check continuity between ECM harness connector F102 terminals 174 (L), 171 (R) and ground. 174 (L) - ground : Continuity should not exist. 171 (R) - ground : Continuity should not exist. OK or NG OK >> GO TO 4. NG >> Repair harness between ECM and harness connector F105.
4. CHECK HARNESS FOR SHORT CIRCUIT Disconnect harness connector M132 and harness connector M141. Check continuity between harness connector M135 terminals 46T (L) and 45T (R). 46T (L) - 45T (R) : Continuity should not exist. OK or NG OK >> GO TO 5. NG >> Check the following harnesses. If any harness is damaged, repair the harness. Harness between harness connector M135 and harness connector M132. Harness between harness connector M135 and harness connector M132.
5. CHECK HARNESS FOR SHORT CIRCUIT Check continuity between harness connector M135 terminals 46T (L), 45T (R) and ground. 46T (L) - ground : Continuity should not exist. 45T (R) - ground : Continuity should not exist. OK or NG OK >> GO TO 6. NG >> Check the following harnesses. If any harness is damaged, repair the harness. Harness between harness connector M135 and harness connector M132. Harness between harness connector M135 and harness connector M141.
6. CHECK HARNESS FOR SHORT CIRCUIT Disconnect VDC/TCS/ABS control unit connector. Check continuity between VDC/TCS/ABS control unit harness connector E218 terminals 61 (L) and 63 (R). 61 (L) - 63 (R) : Continuity should not exist. OK or NG OK >> GO TO 7. NG >> Repair harness between VDC/TCS/ABS control unit and harness connector E222.
7. CHECK HARNESS FOR SHORT CIRCUIT Check continuity between VDC/TCS/ABS control unit harness connector E218 terminals 61 (L), 63 (R) and ground. 61 (L) - ground : Continuity should not exist. 63 (R) - ground : Continuity should not exist. OK or NG OK >> GO TO 8. NG >> Repair harness between VDC/TCS/ABS control unit and harness connector E222.
8. CHECK HARNESS FOR SHORT CIRCUIT Check continuity between harness connector B211 terminals 52V (L) and 53V (R). 52V (L) - 53V (R) : Continuity should not exist. OK or NG OK >> GO TO 9. NG >> Repair harness between harness connector B211 and harness connector B211.
9. CHECK HARNESS FOR SHORT CIRCUIT Check continuity between harness connector B211 terminals 52V (L), 53V (R) and ground. 52V (L) - ground : Continuity should not exist. 53V (R) - ground : Continuity should not exist. OK or NG OK >> GO TO 10. NG >> Repair harness between harness connector B211 and harness connector B211.
10. CHECK HARNESS FOR SHORT CIRCUIT Disconnect steering angle sensor connector and combination meter connector. Check continuity between data link connector M31 terminals 6 (L) and 3 (R). 6 (L) - 3 (R) : Continuity should not exist. OK or NG OK >> GO TO 11. NG >> Check the following harnesses. If any harness is damaged, repair the harness. Harness between data link connector and harness connector M141. Harness between data link connector and harness connector M135. Harness between data link connector and steering angle sensor. Harness between data link connector and combination meter.
11. CHECK HARNESS FOR SHORT CIRCUIT Check continuity between data link connector M31 terminals 6 (L), 3 (R) and ground. 6 (L) - ground : Continuity should not exist. 3 (R) - ground : Continuity should not exist. OK or NG OK >> GO TO 12. NG >> Check the following harnesses. If any harness is damaged, repair the harness. Harness between data link connector and harness connector M141. Harness between data link connector and harness connector M135. Harness between data link connector and steering angle sensor. Harness between data link connector and combination meter.
12. CHECK HARNESS FOR SHORT CIRCUIT Disconnect TCM connector. Check continuity between TCM harness connector F103 terminals 6 (L) and 7 (R). 6 (L) - 7 (R) : Continuity should not exist. OK or NG OK >> GO TO 13. NG >> Repair harness between TCM and harness connector F105.
13. CHECK HARNESS FOR SHORT CIRCUIT Check continuity between TCM harness connector F103 terminals 6 (L), 7 (R) and ground. 6 (L) - ground : Continuity should not exist. 7 (R) - ground : Continuity should not exist. OK or NG OK >> GO TO 14. NG >> Repair harness between TCM and harness connector F105.
14. ECM/COMBINATION METER INTERNAL CIRCUIT INSPECTION Check components inspection. Refer to " «ECM/COMBINATION METER INTERNAL CIRCUIT INSPECTION»(ref-181251-S15113347312005080300000) ". OK or NG OK >> Connect all the connectors and diagnose again. Refer to " «WORK FLOW»(ref-181251-S35033917552005080300000) ". NG >> Replace ECM and/or combination meter.

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1. Remove ECM and combination meter from vehicle.
2. Check resistance between ECM terminals 174 and 171.
3. Check resistance between combination meter terminals 34 and 35.

Note. If "NG" is displayed on "INITIAL DIAG (Initial diagnosis)" as "CAN DIAG SUPPORT MNTR" for the diagnosed control unit, replace control unit.

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Note. If "NG" is displayed on "INITIAL DIAG (Initial diagnosis)" as "CAN DIAG SUPPORT MNTR" for the diagnosed control unit, replace the control unit.

Check harness between VDC/TCS/ABS control unit and ICC unit. Refer to LAN- 50, "Circuit Check Between VDC/TCS/ABS Control Unit and ICC Unit".

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Check harness between ICC unit and data link connector. Refer to " CIRCUIT CHECK BETWEEN ICC UNIT AND DATA LINK CONNECTOR ".

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Check ECM circuit. Refer to " ECM CIRCUIT CHECK ".

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Check VDC/TCS/ABS control unit circuit. Refer to " VDC/TCS/ABS CONTROL UNIT CIRCUIT CHECK ".

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Check ICC sensor circuit. Refer to " ICC SENSOR CIRCUIT CHECK ".

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Check ICC unit circuit. Refer to " ICC UNIT CIRCUIT CHECK ".

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Check TCM circuit. Refer to " TCM CIRCUIT CHECK ".

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