Mazda MX-6 1998, Workshop Manual

Page: 419 / 1282

MECHANICAL [FS]
ENGINE TUNE-UP [FS]
Engine Tune-up Preparation
1. Warm up the engine to the normal operating
temperature.
2. Shift transaxle into Neutral (MTX) or P position
(ATX).
3. Turn off all electrical loads.
• Headlight
• Blower
• Rear window defroster
• Power steering
4. Verify that the battery is fully charged. (Refer to
0 1 -1 7 BATTERY INSPECTION.)
5. Connect the SSTs (NGS tester) to the data link
connector and select the “PID/DATA MONITOR
AND RECORD” function and press TRIGGER.
I . I
d i a g n o s t i c t e s t m o d e s
I
PID/DATA MONITOR AND RECORD
ACTIVE COMMAND MODES
DIAGNOSTIC TROUBLE CODE LIBRARY
SELECT ITEM ANO PRESS TRIGGER TO START
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6. Select “RPM” and press TRIGGER.
7. Wait until the electrical fan stops.
8. Select “START” to begin.
Ignition Timing Inspection
1. Perform “Engine Tune-up Preparation” .
2. Verify that the idle speed is within the
specification.
Specification
MTX: 550— 850 (700 ± 150) rpm
ATX: 500— 800 (650 ± 150) rpm
3. If not as specified, adjust the idle speed. (Refer to
Idle Speed Adjustment.)
4. Connect a timing light to the high-tension lead of
the No.1 cylinder.
5. Verify that the timing mark (yellow) is within the
specification.
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6. If not as specified, inspect the following.
• Camshaft position sensor
• Crankshaft position sensor
• Throttle position sensor
• Engine coolant temperature sensor
• Neutral switch (MTX)
• Clutch switch (MTX)
• Transaxle range switch (ATX)
7.
If the devices are normal, replace the PCM.
Idle Speed Adjustment
1
. Warm up the engine to normal operating
temperature.
2.
Shift the transaxle into Neutral (MTX) or P position
(ATX).
3.
Turn off all loads.
• Blower motor
• Power steering
• Electrical loads (i.g, headlight, rear window
defroster)
4.
Verify that the battery is fully charged. (Refer to
0 1 - 1 7
BATTERY INSPECTION.)
5.
Connect the SSTs (NGS tester) to data link
connector.
6. Select the “ DIAGNOSTIC DATA LINK" and press
the TRIGGER.
W6U110WZ0
7. Select the “PCM-POWERTRAIN CONTROL
MODULE” and press the TRIGGER.
I . . I
PCM - POWERTRAIN CONTROL MODUl F
ABS - ANTILOCK BRAKE SYSTEM
SELECT ITEM ANO PRESS TRIGGER TO START
W6U110WZ1
8. Select “PID/DATA MONITOR AND RECORD” and
press the TRIGGER.
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Specification
MTX: BTDC 6— 1 8 ' (12° ± 6°)/550— 850 rpm
ATX: BTDC 6— 18° (12° ± 6°)/500— 800 rpm
0 1 -1 0 A -1 6