Engine Controls - On-Vehicle Adjustments: Other Mazda MX-5 NB рестайлинг

ENGINE MECHANICAL

Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.

Tribute (2.0L)

1. Ensure engine is cold. Remove valve cover. Using feeler gauge, measure valve clearance between base of camshaft lobe and valve tappet. Record measurement and location of all valve tappets. If any tappets are not within specification, go to next step. See «VALVE CLEARANCE SPECIFICATIONS»(ref-151874-S36037188242003010800000) table. CAUTION: If timing belt is to be reused, mark direction of timing belt to rotation of camshaft prior to removal or premature wear or failure can occur.
2. Remove timing belt and appropriate camshaft for valves requiring adjustment. See appropriate MECHANICAL article in ENGINES. Remove appropriate tappet and measure thickness of tappet. Select tappet by adding measured clearance plus base tappet thickness minus most desirable clearance. Lubricate tappets with SAE 5W-30 oil and reinstall camshafts. Ensure valve clearances are as specified. See «VALVE CLEARANCE SPECIFICATIONS»(ref-151874-S36037188242003010800000) table. To complete repair, reverse removal procedure. Install NEW valve cover gasket.

CRANKSHAFT POSITION SENSOR

Note. On all models except Mazda6 (2.3L) and Miata, Crankshaft Position (CKP) sensor is not adjustable. If clearance is not as specified, replace CKP sensor or crankshaft pulley.

MAZDA6 (2.3L)

1. Remove right front wheel.
2. Remove splash shield.
3. Disconnect CKP sensor harness connector.
4. Remove CKP sensor.
5. Remove right driveshaft.
6. Remove cylinder block lower blind plug and install Crankshaft TDC Timing Peg (303-507). see scheme 4and see scheme 5.
7. Turn crankshaft pulley clockwise until it stops.
8. Using straight edge, draw a straight line in center of ninth tooth of crankshaft pulley pulse wheel (counting counterclockwise from empty space).
9. Align center line of CKP sensor and line drawn in step 8, then install CKP sensor with mounting bolts.
10. Reconnect CKP sensor harness connector.
11. Remove crankshaft TDC timing peg.
12. Install cylinder block lower blind plug.
13. Install right driveshaft.
14. Install right splash shield.
15. Install right front wheel.

MIATA

Loosen CKP sensor bolt. Using feeler gauge, adjust air gap between sensor and crankshaft sensor plate projections to.020-0.59" (0.5-1.5 mm). (Scheme 2) Tighten CKP sensor bolt. If clearance is still not within specification, replace CKP sensor or sensor plate behind crankshaft pulley.

Scheme 1

IGNITION TIMING

Note. Before adjusting or inspecting ignition timing, warm engine to normal operating temperature. Turn off all accessories. Place transmission in Neutral (M/T) or Park (A/T). Wait for cooling fan to stop. Ensure idle speed is correct. See IDLE SPEED under IDLE SPEED & MIXTURE.

MIATA, PROTEGE & PROTEGE5

Note. New Generation Star (NGS) scan tool or equivalent is used to perform following procedures.

1. Connect scan tool to DLC-2 located under left side of instrument panel. (Scheme 4)and (Scheme 6). Connect fused jumper wire between terminals TEN and GND at DLC-1 in engine compartment. (Scheme 5)
2. Ensure idle speed is correct. See «IDLE SPEED»(ref-151874-S17508225392003010800000) under IDLE SPEED & MIXTURE. Connect timing light to high-tension lead No. 1. Start engine and allow it to idle. Check timing. See «IGNITION TIMING SPECIFICATIONS»(ref-151874-S16787022722003010800000) table. (Scheme 7)
3. If ignition timing is not within specification, check CMP, CKP, TP and ECT sensors and transaxle/transmission range switch. See «SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5»(ref-134969) article. If all sensors and switches are okay, replace PCM.

IGNITION TIMING SPECIFICATIONS (DEGREES BTDC @ RPM)

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

MPV

1. Warm up engine to normal operating temperature.
2. Shift transaxle into neutral.
3. Turn off all electrical loads (headlights, blower fan, rear window defroster and A/C).
4. Verify steering wheel is in straight ahead position.
5. Short DLC-1 terminal TEN to body GND using fused jumper wire. (Scheme 5)
6. Connect scan tool to DLC-2.
7. Select IGT PID. Ensure IGT PID is within specification. See «IGNITION TIMING SPECIFICATIONS»(ref-151874-S16787022722003010800000) table. Increase engine speed and verify IGT PID value is advanced. If IGT PID reading does not advance, inspect following: Crankshaft Position (CKP) sensor and related harness. See «CRANKSHAFT POSITION SENSOR»(ref-151892-S03434950902003010900000) under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. Mass Air Flow (MAF) sensor and related harness. See «MASS AIRFLOW SENSOR»(ref-151892-S09739612212003010900000) under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. Intake Air Temperature (IAT) sensor and related harness. See «INTAKE AIR TEMPERATURE SENSOR»(ref-151892-S01193409072003010900000) under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. Repair as necessary and recheck timing.

IDLE SPEED & MIXTURE

Note. Idle mixture is not adjustable. If idle mixture is incorrect, see appropriate SELF-DIAGNOSTICS article.

COLD (FAST) IDLE SPEED

Note. Fast idle speed is computer controlled and is not adjustable.

IDLE SPEED

Note. Before adjusting idle speed, warm engine to normal operating temperature. Turn off all accessories. Place transaxle/transmission in Neutral (M/T) or Park (A/T). Ensure battery is fully charged. Wait for cooling fan to stop. DO NOT adjust idle using Throttle Adjusting Screw (TAS). TAS is preset and if adjusted, will adversely affect engine performance.

Mazda6

Idle speed is controlled by PCM and is not adjustable. Ensure Electronic Throttle Control System (Accelerator Pedal Position (APP) sensor and throttle actuator), A/C switch, Engine Coolant Temperature (ECT) sensor and Intake Air Temperature (IAT) sensor are functioning properly. See appropriate diagnostic procedure in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If these are okay, check PCM for Diagnostic Trouble Codes (DTCs). See appropriate SELF-DIAGNOSTICS article. If no DTCs are present, go to TROUBLE SHOOTING - NO CODES article.

1. Connect scan tool to DLC-2 located under left side of instrument panel: Miata - Above fuse block, behind fuse block cover. Protege and Protege5 - Left of steering column. (Scheme 4) Connect fused jumper wire between terminals TEN and GND at DLC-1 in engine compartment. (Scheme 5)
2. Start engine and allow it to idle. Turn off all electrical loads. Using NGS scan tool, select PID/DATA MONITOR AND RECORD and monitor RPM. If idle speed is not within specification, rotate Air Adjusting Screw (AAS) on throttle body. (Scheme 8)- see scheme 22. See «IDLE SPEED SPECIFICATIONS»(ref-151874-S23024039052003010800000) table.

IDLE SPEED SPECIFICATIONS

Scheme 7

Scheme 8

THROTTLE POSITION SENSOR

Throttle Position (TP) sensor is not adjustable. For testing procedure, refer to appropriate SYSTEM & COMPONENT TESTING article.