Mazda MX-6 1998, Workshop Manual

Page: 764 / 1282

TROUBLESHOOTING [GF4A-EL]
DTC P0743 TCC control solenoid circuit failure during self-test
DESCRIPTION
• Damaged wiring or connectors between torque converter clutch control solenoid valve and powertrain
control module
• Short or open circuit in torque converter clutch control solenoid valve
• Short or open circuit in powertrain control module internal transistors
POSSIBLE
CAUSE
• Damaged wiring or connectors between torque converter clutch control solenoid valve and powertrain
control module
• Short or open circuit in torque converter clutch control solenoid valve
• Short or open circuit in powertrain control module internal transistor
STEP INSPECTION
ACTION
1 Are powertrain control module and torque
converter clutch control solenoid valve
connections at connector and connector pins
okay?
Yes Go to next step
No Repair or replace connector(s), then go to step 7
2 Check NGS tester display
• Connect NGS tester to data link connector
• Are torque converter clutch control solenoid
valve operation and NGS tester display
correct?
xr
0 1 -40B POWERTRAIN CONTROL
MODULE (PCM) INSPECTION [KL]
Yes Go to step 7
No
Go to next step
3 Check for continuity between terminals of torque
converter clutch control solenoid valve and
powertrain control module
• Disconnect negative battery cable
• Disconnect solenoid connector and powertrain
control module connector
• Is there continuity between terminals?
Yes Go to next step
No
Repair or replace connectors and wiring, then go to step 7
4 Check for a short circuit between terminals of
torque converter clutch control solenoid and
powertrain control module.
• Disconnect solenoid and powertrain control
module connectors
• Connect ohmmeter between GND and torque
converter clutch control solenoid connector
terminal
• Is continuity present?
Yes
Repair short circuit, then go to step 7
No
Go to next step
5 Measure resistance at torque converter clutch
control solenoid valve terminal
• Disconnect nagative battery cable
• Disconnect solenoid connector
• Is resistance correct?
xr 0 5 -1 7B SOLENOID VALVES INSPECTION
[GF4A-EL]
Yes Go to next step
No Replace torque converter clutch control solenoid valve,
then go to step 7
x t
0 5 -1 7B SOLENOID VALVES
REMOVAL/INSTALLATION [G F4A-EL]
6
After diagnostic trouble code has been cleared,
recheck if diagnostic trouble code is shown
cr 0 1 -0 1 B ENGINE ON-BOARD DIAGNOSIS
[KL]
Yes Return to step 2
No Problem is a temporary poor connection of wiring or
connectors, and should be investigated further, then go to
next step
7 Erase diagnostic trouble code from memory. Can
code be output after performing “After Repair
Procedure”?
Yes Go to appropriate inspection procedure
No Finished
0 5 -0 1 B -1 8