Mazda Mazda6 - Dtc P0748

K2–146
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0748
A6E577018901214
11 INSPECT TERMINAL COMPONENT NO.1 (12-
PIN) CIRCUIT FOR SHORT TO POWER
• Turn ignition key to ON (engine OFF).
• Check voltage at terminal component No.1 (12-
pin) terminal H (harness-side).
• Is voltage 0 V?
Yes Go to next step.
No Repair or replace harness, then go to Step 13.
12 INSPECT TCM CIRCUIT FOR SHORT TO
GROUND
• Turn ignition key to OFF.
• Check continuity between TCM terminal 2S
(harness-side) and body ground.
• Is there any continuity?
Yes Repair or replace harness, then go to next step.
No Go to next step.
13 VERIFY TROUBLESHOOTING OF DTC P0743
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory using WDS or
equivalent.
• Drive vehicle in D range and make sure that
gears shift smoothly from 1GR to 5GR.
• Is same DTC present?
Yes Replace TCM, then go to next step.
(See K2–96 TCM REMOVAL/INSTALLATION.)
No Go to next step.
14 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
(See K2–124 AFTER REPAIR PROCEDURE.)
• Is there any DTC present?
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
STEP INSPECTION ACTION
DTC P0748 Pressure control solenoid circuit malfunction (open/short)
DETECTION
CONDITION
• Open or short in pressure control solenoid signal system (while TCM monitors solenoid output voltage, the
voltage that differs from the ON/OFF signal output by CPU in TCM is detected).
Diagnostic support note:
• This is a continuous monitor (CCM).
• MIL does not illuminate.
• PENDING CODE is not available.
• FREEZE FRAME DATA is not available.
• AT warning light indication.
• DTC is stored in TCM memory.
POSSIBLE
CAUSE
• Open circuit between pressure control solenoid terminal A and TCM terminal 2Y
• Short to ground between pressure control solenoid terminal A and TCM terminal 2Y
• Short to power between pressure control solenoid terminal A and TCM terminal 2Y
• Pressure control solenoid malfunction
• Damaged connector between pressure control solenoid valve and TCM
• TCM malfunction