Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL KL]
STEP INSPECTION
ACTION
4 CHECK MAF SIGNAL CIRCUIT FOR
SHORTS TO GROUND CIRCUIT
• Key off.
• MAF sensor disconnected.
• Breakout box installed, PCM disconnected.
• Disconnect NGS tester from DLC.
• Measure resistance between Test Pin 88 or
Test Pins 36 and 24 or 103 at breakout
box.
• Is each resistance greater than 10,000
ohms?
Yes
MAF signal circuit and GROUND harness circuits to PCM
are okay.
RECONNECT NGS tester.
Go to next step.
No
Service short circuit between MAF signal and GROUND or
MAF RTN.
REMOVE breakout box.
RECONNECT all components.
RESET PCM to completely clear DTCs.
c r After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
5 CHECK CONTINUITY OF MAF SIGNAL
CIRCUIT
• Key off.
• MAF sensor disconnected.
• Breakout box installed, PCM disconnected.
• Measure resistance between MAF circuit at
MAF sensor vehicle harness connector
and Test Pin 88 at breakout box.
• Is resistance less than 5.0 ohms?
Yes MAF signal circuit to PCM is okay.
Go to next step.
No SERVICE open in MAF signal circuit.
REMOVE breakout box.
RECONNECT all components.
RESET PCM to completely clear DTCs.
<sr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
6 CHECK GROUND CIRCUIT TO MAF
SENSOR
• Key off.
• MAF sensor disconnected.
• Breakout box installed.
• Key on, engine off.
• Measure voltage between power circuit
and ground circuit at MAF sensor vehicle
harness connector.
• Is voltage greater than 10.5 volts?
Yes Ground circuit from battery negative post to MAF sensor is
okay.
Go to step 8.
No Go to next step.
7 CHECK MAF SENSOR GROUND CIRCUIT
CONTINUITY
• Key off.
• MAF sensor disconnected.
• Breakout box installed.
• Disconnect PCM.
• Disconnect NGS tester from DLC.
• Measure resistance between ground circuit
at MAF sensor vehicle harness connector
and battery negative post.
• Is resistance less than 10 ohms?
Yes Ground harness circuit to MAF sensor is okay.
RECONNECT NGS tester.
Go to next step.
No SERVICE open in Ground harness circuit.
REMOVE breakout box.
RECONNECT all components.
RESET PCM to completely clear DTCs.
sr
After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
8 CHECK PCM GROUND CIRCUIT (BETWEEN
PCM AND MAF SENSOR GROUND
CIRCUIT) CONTINUITY
• Key off.
• MAF sensor disconnected.
• Breakout box installed, PCM disconnected.
• Measure resistance between PCM ground
circuit at MAF sensor vehicle harness
connector and Test Pin 36 at breakout box.
• Is resistance less than 5.0 ohms?
Yes PCM ground harness circuit to PCM is okay.
Go to next step.
No SERVICE open in PCM ground harness circuit.
REMOVE breakout box.
RECONNECT all components.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
9 CHECK MAF SIGNAL CIRCUIT FOR SHORT
TO GROUND IN PCM
• Key off.
• MAF sensor disconnected.
• Breakout box installed.
• Reconnect PCM to breakout box.
• Disconnect NGS tester from DLC (if
applicable).
• Measure resistance between Test Pin 88
and Test Pins 36 and 24 or 103 at breakout
box.
• Is each resistance greater than 10,000
ohms?
Yes RECONNECT NGS tester.
Go to next step.
No MAF signal circuit short to ground in PCM.
REMOVE breakout box.
RECONNECT MAF sensor.
RESET PCM to completely clear DTCs.
i
xt
After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
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