Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL FS]
Spark Test
1. Disconnect the fuel pump relay connector.
2. Verify each high-tension lead and connector is connected properly.
3. Inspect the ignition system in the following procedure.
Warning
• High voltage in the ignition system can cause strong electrical shock which can result in serious
injury. Avoid direct contact to the vehicle body during the following spark test.
STEP
INSPECTION ACTION
1 Remove hightension lead from spark plug.
Hold high-tension lead with installed pliers
5— 10 mm {0.20— 0.39 in} from ground.
Turn ignition switch to START and verify that
there is a strong blue spark. (Check each
cylinder)
Yes Ignition system okay.
No If some cylinders do not spark, go to step 2.
If all cylinders do not spark, go to step 3.
2
Is hightension lead resistance correct?
Specification
16 kQ/m
Yes Check for crack or damage of hightension lead and
ignition coil.
No Replace hightension lead.
3
Does PCM or ignition coil connector have
poor connection?
Yes Repair or replace connector.
No Go to next step.
4 Is ignition coil winding resistance okay?
Yes Go to next step.
No Replace ignition coil.
5
Are following parts okay?
• CKP sensor and crankshaft pulley (also,
check for a gap).
Specification
0.5— 1.5 mm {0.020— 0.059
In}
• PCM terminal 21/22 voltage
Specification
Approx. 1.5 V
Yes
Check for open or short in wiring harness and connectors
of CKP sensor.
No Repair or replace.
Fuel Cut Control Inspection
1. Warm up the engine to normal operating
temperature and let it idle.
2. Increase the engine speed to 3,000 rpm, then
suddenly release the throttle.
3. Check if there is no operational sound from each
injector with a screwdriver or a sound scope when
the engine speed is above approx. 2,500 rpm on
deceleration.
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Cooling Fan Control System Inspection
Cooling fan operation
Engine condition
Cooling
fan relay
Condenser
fan relay
Engine coolant temperature
below 97 °C {207 ” F}
OFF OFF
Engine coolant temperature
above 97 “ C {2 0 7 °F}
ON OFF
Engine coolant temperature
above 109 °C {2 2 8 T )
ON ON
Air conditioning switch ON
ON ON
Engine coolant temperature
sensor malfunction
ON ON
Cooling fan
1. Verify the engine is cold.
2. Turn the ignition switch ON.
3. Verify the cooling fan is not operating.
4. If the cooling fan is operating:
(1) Connect the SSTs (NGS tester) to the DLC.
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