Mazda MX-6 1998, Workshop Manual

Page: 683 / 1282

TROUBLESHOOTING [LA4A-EL]
STEP INSPECTION
ACTION
A3 CHECK CONTINUITY OF SOLENOID SIGNAL
AND POWER HARNESS CIRCUITS
• Key off.
• Solenoid body connector disconnected
(Transaxle connector).
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion, loose wires, etc.
Service as required.
• Install breakout box, leave PCM disconnected.
• Refer to connector schematic and table of
solenoid body.
d
* Solenoid Body Connector Component
• Measure resistance between PCM signal test
pin (27 or 1) at the breakout box and signal pin
at solenoid body connector.
• Measure resistance between PCM test pin
(71/97) at the breakout box and power circuit
pin at solenoid body connector.
• Is each resistance less than 5.0 ohms?
Yes Go to next step.
No Service open circuit(s).
Remove breakout box.
Reconnect all components.
Rerun OBD tests.
A4 CHECK TEST PIN 27.1 FOR SHORTS TO
POWER AND GROUND
• Breakout box is installed, PCM is
disconnected.
• Solenoid body connector is disconnected.
• Refer to connector schematic and table of
solenoid body.
icr Solenoid Body Connector Component
Measure following voltages
• Between test pin 27 and 71
• Between test pin 27 and 97
• Between test pin 27 and 77
• Between test pin 27 and 103
• Between test pin 27 and 91
• Between test pin 1 and 71
• Between test pin 1 and 97
• Between test pin 1 and 77
• Between test pin 1 and 103
• Between test pin 1 and 91
• Is each resistance greater than 10,000 ohms?
Yes Go to next step.
No Service short circuit.
Remove breakout box.
Reconnect all components.
Rerun OBD tests.
A5 SOLENOID FUNCTIONAL TEST
• Ensure that the harness is disconnected at the
transaxle.
• Install transaxle tester at the solenoid body
connecter.
• Using tests outlined under tester instructions,
Perform the solenoid voltage test.
Note
• LED will illuminate “GREEN” when solenoid is
activated and illuminate "OFF” when
deactivated.
• LED will illuminate “RED” if activated solenoid
is shorted to BAT+.
• LED will remain
“OFF”
if an activated solenoid
is shorted to ground or no continuity.
• Do the solenoids activate? (LED GREEN)
Yes Go to next step.
No Go to A7.
A6
TRANSAXLE DRIVE TEST
• Perform the drive test.
• Does the vehicle upshift when commanded by
the tester?
c r 0 5 -1 7A ELECTRICAL SYSTEM
COMPONENTS [LA4A-EL]
Yes Replace the PCM.
Reconnect all components.
Rerun OBD tests.
If symptom still present.
o* 0 5 -0 1 A AUTOMATIC TRANSAXLE SYMPTOM
TROUBLESHOOTING [LA4A-EL], Shift concern
No Go to next step.
0 5 -0 1 A -8