Mazda MX-6 1998, Workshop Manual

Page: 315 / 1282

TROUBLESHOOTING [ENGINE CONTROL KL]
STEP
INSPECTION ACTION
6 CHECK CDCV SIGNAL FROM PCM
• Key off.
• Breakout box installed.
• Reconnect PCM to breakout box.
• Reconnect CDCV vehicle harness
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 Pinpoint Test Step that directed you
here.
RESET PCM to completely clear DTCs.
c? 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.
<c r After Repair Procedure
• COMPLETE OBD II Drive Mode.
•
Is MIL illuminated?
Yes ISOLATE pressure leak in evaporative emission system
(i.e., vacuum/fuel vapor hose connections, cracked/split
hoses, damaged components).
SERVICE as necessary.
VERIFY symptom no longer exists.
RESET PCM to completely clear DTCs.
c r After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No RETURN to Action to Take column of Pinpoint Test Step
that directed you here.
DTC P1460
Wide open throttle air conditioning cutoff circuit malfunction
DESCRIPTION
• Key on engine off (KOEO), key on engine running (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 coll circuit
and ignition switch (IG1) pin at A/C relay.
• Resistance should be between 50 and
100 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
10,000 ohms.
•
Are all resistance checks okay?
Yes
Go to next step.
No REPLACE A/C relay.
RECONNECT all components.
RERUN OBD Test.
01-01B -109