Maintenance: Diagnosis Infiniti M37 IV

RADIATOR: Inspection

Check radiator for mud or clogging. If necessary, clean radiator as follows

1. Be careful not to bend or damage radiator fins.
2. When radiator is cleaned without removal, remove all surrounding parts such as radiator cooling fan assembly and horns. Then tape harness and connectors to prevent water from entering.

1. Apply water by hose to the back side of the radiator core vertically downward.
2. Apply water again to all radiator core surfaces once per minute.
3. Stop washing if any stains no longer flow out from radiator.
4. Blow air into the back side of radiator core vertically downward. Use compressed air lower than 490 kPa (5 kg/cm 2 , 71 psi) and keep distance more than 30 cm (11.8 in).
5. Blow air again into all the radiator core surfaces once per minute until no water sprays out.

FUEL LINES: Inspection

Inspect fuel lines, fuel filler cap and fuel tank for improper attachment, leakage, cracks, damage, loose connections, chafing or deterioration.

Scheme 1

If necessary, repair or replace damaged parts.

Scheme 2

Scheme 3

1. Unhook clips (A).
2. Remove holder (3) from air cleaner case (2), and then remove air cleaner filter (1) from holder.

INSPECTION AFTER INSTALLATION

1. Check the engine oil level. Refer to " «INSPECTION»(ref-573580-S26668830862013082200000) ".
2. Start the engine, and check there is no leak of engine oil.
3. Stop the engine and wait for 10 minutes.
4. Check the engine oil level, and adjust the level. Refer to " «INSPECTION»(ref-573580-S26668830862013082200000) ".

Scheme 4

1. Remove engine cover with power tool. Refer to " «EXPLODED VIEW»(ref-573576-S12390112682013082200000) ".
2. Remove air cleaner case and air duct (RH and LH). Refer to " «EXPLODED VIEW»(ref-573576-S30211395222013082200000) ".
3. Remove electric throttle control actuator. Refer to " «EXPLODED VIEW»(ref-573576-S04194053782013082200000) ".
4. Remove ignition coil. Refer to " «REMOVAL AND INSTALLATION»(ref-573576-S15249523802013082200000) ".
5. Remove spark plug with a spark plug wrench (commercial service tool).

INSPECTION AFTER REMOVAL

Use the standard type spark plug for normal condition.

Spark plug (Standard type): Refer to " SPARK PLUG ".

Scheme 5

Scheme 6

EVAP VAPOR LINES: Inspection

1. Visually inspect EVAP vapor lines for improper attachment and for cracks, damage, loose connections, chafing and deterioration. Refer to " «INSPECTION»(ref-573577-S19624741312013082200000) ".
2. Inspect fuel tank filler cap vacuum relief valve for clogging, sticking, etc. Refer to " «COMPONENT INSPECTION»(ref-573577-S30400481172013082200000) ".

Scheme 7

Check radiator for mud or clogging. If necessary, clean radiator as per the following

1. Be careful not to bend or damage radiator fins.
2. When radiator is cleaned without removal, remove all surrounding parts such as radiator cooling fan assembly and horns. Then tape harness and connectors to prevent water from entering.

1. Apply water by hose to the back side of the radiator core vertically downward.
2. Apply water again to all radiator core surfaces once per minute.
3. Stop washing if any stains no longer flow out from radiator.
4. Blow air into the back side of radiator core vertically downward. Use compressed air lower than 490 kPa (5 kg/cm 2 , 71 psi) and keep distance more than 30 cm (11.8 in).
5. Blow air again into all the radiator core surfaces once per minute until no water sprays out.

Inspect fuel lines, fuel filler cap and fuel tank for improper attachment, leakage, cracks, damage, loose connections, chafing or deterioration.

Scheme 8

If necessary, repair or replace damaged parts.

Scheme 9

Scheme 10

1. Unhook clips (A), and move the air cleaner cover assembly (1).
2. Remove air cleaner filter (1).

1. Check the engine oil level. Refer to " «INSPECTION»(ref-573599-S27296544962013082200000) ".
2. Start the engine, and check there is no leakage of engine oil.
3. Stop the engine and wait for 15 minutes.
4. Check the engine oil level, and adjust the level. Refer to " «INSPECTION»(ref-573599-S27296544962013082200000) ".

Scheme 11

1. Remove engine cover. Refer to " «EXPLODED VIEW»(ref-573596-S32247852672013082200000) ".
2. Remove air duct.
3. Remove the harness bracket. (bank 2 side)
4. Remove ignition coil. Refer to " «EXPLODED VIEW»(ref-573596-S29479669692013082200000) ".
5. Remove spark plug with a spark plug wrench (commercial service tool).

Use the standard type spark plug for normal condition.

Spark plug (Standard type): Refer to " SPARK PLUG ".

1. Visually inspect EVAP vapor lines for improper attachment and for cracks, damage, loose connections, chafing and deterioration. Refer to " «INSPECTION»(ref-573597-S18887043902013082200000) ".
2. Inspect fuel tank filler cap vacuum relief valve for clogging, sticking, etc. Refer to " «COMPONENT INSPECTION (FUEL FILLER CAP)»(ref-573597-S40823689972013082200000) ".

EXHAUST SYSTEM: Inspection

Check exhaust pipes, muffler and mounting for improper attachment, leaks, cracks, damage or deterioration.

Scheme 12

1. If anything is found, repair or replace damaged parts.

Scheme 13

1. Check transaxle surrounding area (oil seal and plug etc.) for fluid leakage.
2. If anything is found, repair or replace damaged parts and adjust A/T fluid level. Refer to " «ADJUSTMENT»(ref-573584-S42025935112013082200000) ".

POWER STEERING FLUID AND LINES: Inspection

Check fluid level in reservoir tank with engine off.

Use "HOT" range at fluid temperatures of 50 to 80°C (122 to 176°F) or "COLD" range at fluid temperatures of 0 to 30°C (32 to 86°F).

Scheme 14

Scheme 15

AXLE AND SUSPENSION PARTS: Inspection

Check front and rear axle and suspension parts for excessive play, cracks, wear or other damage.

Scheme 16

Scheme 17

1. Shake each wheel to check for excessive play.
2. Check wheel bearings for smooth operation.
3. Check axle and suspension nuts and bolts for looseness.
4. Check strut (shock absorber) for oil leakage or other damage.
5. Check suspension ball joint for grease leakage and ball joint dust cover for cracks or other damage.

DRIVE SHAFT: Inspection

Check boot and drive shaft for cracks, wear, damage and grease leakage.

Scheme 18

SEAT BELT, BUCKLES, RETRACTORS, ANCHORS AND ADJUSTERS: Inspection

For front seat belt illustration. Refer to " SEAT BELT RETRACTOR: EXPLODED VIEW ".

For rear seat belt illustration. Refer to " SEAT BELT RETRACTOR: EXPLODED VIEW ".

For details, refer to " SEAT BELT RETRACTOR: INSPECTION " and " SEAT BELT RETRACTOR: INSPECTION ".

1. Check anchors for loose mounting
2. Check belts for damage
3. Check retractor for smooth operation
4. Check function of buckles and tongues when buckled and released