Starters: Diagnosis Infiniti M45 II

TROUBLE SHOOTING

Note. See STARTER - GENERAL TROUBLE SHOOTING article in GENERAL INFORMATION.

DIAGNOSTIC PROCEDURE 1, CHECK "B" TERMINAL CIRCUIT

1. Remove the fuel pump fuse. See «COMPONENT LOCATIONS»(ref-167746-S08525057362004102500000).
2. Crank or start the engine (if possible) until the fuel pressure is released.
3. Turn the ignition switch OFF.
4. Check that the starter motor connector E313 terminal connection is clean and tight.
5. Check voltage between starter motor connector E313 terminal "B" (Black/Red wire) and ground using a digital circuit tester. See «WIRING DIAGRAMS»(ref-167746-S01741669592004102000000). (Scheme 1) Battery voltage should exist. If voltage is as specified, go to next step. If voltage is as not specified, check harness between the battery and the starter motor for open circuit.
6. Check voltage between starter motor connector E313 terminal "B" (Black/Red wire) and battery positive terminal using a digital circuit tester. With ignition switch in "START" position, voltage should be less than 0.5 volt. (Scheme 1) If voltage is as specified, go to next step. If voltage is as not specified, check harness between the battery and the starter motor for continuity.
7. Check voltage between starter motor case and battery negative terminal using a digital circuit tester. With ignition switch in "START" position, voltage should be less than 0.2 volt. (Scheme 1) If voltage is as specified, starter motor "B" terminal circuit is OK. Further inspection is «WORK FLOW»(ref-167746-S16350544632004102500000) necessary. If voltage is as not specified, check the starter motor case and ground for poor continuity.

Scheme 1

DIAGNOSTIC PROCEDURE 2, CHECK "S" TERMINAL CIRCUIT

1. Remove the fuel pump fuse. See «COMPONENT LOCATIONS»(ref-167746-S08525057362004102500000).
2. Crank or start the engine (if possible) until the fuel pressure is released.
3. Turn the ignition switch OFF.
4. Disconnect starter motor connector E312. See «WIRING DIAGRAMS»(ref-167746-S01741669592004102000000).
5. Check voltage between starter motor connector E312 terminal "S" (Black/Red wire) and ground using a digital circuit tester. With ignition switch "ON", battery voltage should exist. (Scheme 2) If voltage is as specified, go to next step. If voltage is as not specified, check: 50-amp fusible link (letter "G", located in fuse and fusible link box). Park/Neutral Position relay Harness for open or short.
6. Connect starter motor connector E312. Check voltage between starter motor connector E312 terminal "S" (Black/Red wire) and battery positive terminal using a digital tester. With ignition switch in "START" position, voltage should be less than 1.0 volt. (Scheme 2) Starter motor "S" terminal circuit is OK. Further inspection is necessary. Refer to «WORK FLOW»(ref-167746-S16350544632004102500000). If voltage is as not specified, check harness between the battery and the starter motor "S" terminal for poor continuity.

Scheme 2

PINION/CLUTCH INSPECTION

1. Inspect pinion gear teeth and ring gear teeth. Replace pinion if teeth are worn or damaged.
2. Inspect reduction gear teeth and armature shaft gear teeth. Replace reduction gear if teeth are damaged or excessively worn.
3. Pinion should rotate smoothly in one direction and lock in opposite direction. Replace pinion if abnormal resistance is felt.

1. Disconnect negative battery cable.
2. Remove engine undercover.
3. Disconnect "S" connector.
4. Remove "B" terminal nut.
5. Remove starter motor mounting bolt and nut. (Scheme 3)
6. Remove engine mount insulator bottom nuts, and lift up engine approximately 1.2 in. (30 mm) using transmission jack.
7. Remove starter motor from under vehicle.
8. To install, reverse removal procedure. Tighten all bolts and nuts to specification. See «TORQUE SPECIFICATIONS»(ref-167746-S17982905202004102000000).

Scheme 3