Mazda MX-6 1998, Workshop Manual

Page: 99 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
STEP INSPECTION
ACTION
5 CHECK FTP SIGNAL CIRCUIT FOR
SHORTS TO FTP SENSOR GROUND AND
GROUND CIRCUIT
• Key off.
• FTP sensor disconnected.
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion and loose wires.
Service as necessary.
• Install breakout box. Leave PCM
disconnected.
• Disconnect NGS tester from DLC.
• Measure the resistance between Test Pin
62 and Test Pin 91 at breakout box.
• Measure resistance between Test Pin 62
and Test Pins 51 and 103 at breakout box.
• Is each resistance greater than 10,000
ohms?
Yes
FTP signal circuit is shorted to FTP sensor ground or
ground circuit in PCM.
REPLACE PCM.
REMOVE breakout box.
RECONNECT all components.
RERUN OBD Test.
No SERVICE harness short between FTP signal circuit and
FTP sensor ground or ground circuit.
REMOVE breakout box.
RECONNECT all components.
RESET PCM to completely clear DTCs.
er After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
6 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
(vacuum/fuel vapor hose connections, cracked/split
hoses, damaged components. SERVICE as necessary.
VERIFY symptom no longer exists.
RESET PCM to completely clear DTCs.
rr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No If detected here from previous step, return to that step and
continue step.
RETURN to the Action to Take column of the Pinpoint Test
Step that directed you here.
01-01A-71