Mazda MX-6 1998, Workshop Manual

Page: 316 / 1282

TROUBLESHOOTING [ENGINE CONTROL KL]
STEP INSPECTION ACTION
3
CHECK A/C RELAY CIRCUIT FOR SHORT
TO POWER
• Key off.
• A/C relay disconnected.
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion, loose wire, etc.
Service as necessary.
• Install breakout box. Leave PCM
disconnected.
• Key on, engine off.
• Measure voltage between Test Pin 69 at
breakout box and chassis ground.
• Is voltage less than 1.0 volt?
Yes Go to next step.
No
SERVICE short to power.
REMOVE breakout box.
RECONNECT all components.
START engine and TURN A/C on.
WAIT 15 seconds.
TURN A/C and key off.
RERUN OBD Test.
4 CHECK A/C RELAY CIRCUIT FOR SHORT
TO CHASSIS GROUND
• Key off.
• A/C relay disconnected.
• Disconnect NGS tester from DLC.
• Breakout box installed.
• PCM disconnected.
• Measure resistance between Test Pin 69 at
breakout box and chassis ground.
• Is resistance greater than 10,000 ohms?
Yes
Go to next step.
No SERVICE short to ground.
REMOVE breakout box.
RECONNECT all components.
START engine and TURN A/C on.
WAIT 15 seconds.
TURN A/C and key off.
RERUN OBD Test.
5 CHECK A/C RELAY CIRCUIT CONTINUITY
• Key off.
• A/C relay disconnected.
• Breakout box installed, PCM disconnected.
• Measure resistance between Test Pin 69 at
breakout box and A/C RELAY circuit at A/C
relay vehicle harness connector.
• Is resistance less than 5.0 ohms?
Yes REPLACE PCM.
REMOVE breakout box.
RECONNECT all components.
START engine and TURN A/C on.
WAIT 15 seconds.
TURN A/C off.
RERUN OBD Test.
No SERVICE open circuit.
REMOVE breakout box.
RECONNECT all components.
START engine and TURN A/C on.
WAIT 15 seconds.
TURN A/C Off.
RERUN OBD Test.
01-01B-110