Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [ENGINE CONTROL FS]
STEP INSPECTION ACTION
6
CHECK CDCV SIGNAL FROM PCM
• Key off.
• Breakout box installed.
• Reconnect PCM to breakout box.
• Reconnect CDCV connector.
• Connect digital multimeter between Test
Pin 18 and Test Pin 51 or 103 at breakout
box.
• Start engine.
• Observe voltage on digital multimeter.
• Is voltage between 10.0 and 14.0 volts?
Yes REPLACE damaged CDCV.
REMOVE breakout box.
RECONNECT all components.
RECORD and REMEMBER this pinpoint test step.
Go to next step.
Then RETURN to the pinpoint test step that directed you
here.
RESET PCM to completely clear DTCs.
rr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No REPLACE PCM.
REMOVE breakout box.
RECONNECT all components.
RERUN OBD Test.
7 EVAPORATIVE SYSTEM RE-CHECK
• RESET PCM to completely clear DTCs.
zr After Repair Procedure
• COMPLETE OBD II Drive Mode.
• Is MIL illuminated?
Yes
ISOLATE pressure leak in evaporative emission system
(ie, vacuum/fuel vapor hose connections, cracked/split
hoses, damaged components.) SERVICE as necessary.
VERIFY symptom no longer exists.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No RETURN to the action to take column of pinpoint test step
that directed you here.
KOEO, KOER P1460
DTC
Wide open throttle air conditioning cutoff circuit malfunction
DESCRIPTION
• KOEO KOER DTC P1460 indicates an A/C relay primary circuit fault
[Possible Cause]
• Open or shorted circuit • Damaged PCM
• Damaged A/C relay
STEP INSPECTION ACTION
1 CHECK FOR IGNITION SWITCH (IG1)
VOLTAGE TO A/C RELAY
Note
• Verify A/C and defrost were off during
KOEO and KOER self-tests.
• Key off.
• Disconnect A/C relay.
• Key on.
• Measure voltage between ignition switch
(IG1) circuit at A/C relay vehicle harness
connector and chassis ground.
• Is voltage greater than 10.5 volts?
Yes Go to next step.
No VERIFY condition of related fuses. If okay, SERVICE open
circuit.
RECONNECT all components.
RERUN OBD Test.
2
CHECK A/C RELAY
• Key off.
• A/C relay disconnected.
• Check A/C relay coil resistance:
• Measure resistance A/C relay coil circuit
and ignition switch (IG1) pin at A/C relay.
• Resistance should be between 50 and
1 0 0
ohms.
• Check A/C relay for internal shorts:
• Measure resistance between A/C relay
coil circuit pin and following pins at A/C
relay: B+, power-to-clutch, ground.
• Resistances should be greater than
10 ,0 0 0
ohms.
• Are all resistance checks okay?
Yes Go to next step.
No REPLACE A/C relay.
RECONNECT all components.
RERUN OBD Test.
01-01A -1 04