Mazda RX-8 Manual page 1220

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DTC P0748
Pressure control solenoid circuit malfunction (open circuit/short to ground or power
DTC P0748
supply)
DETECTION
CONDITION
POSSIBLE
CAUSE
Open or short circuit in pressure control solenoid signal system (when the TCM
monitors solenoid output voltage, voltage that differs from the ON/OFF signal
output by CPU in TCM is detected)
Diagnostic support note:
This is continuous monitor (CCM).
MIL does not illuminates.
PENDING CODE is not available.
FREEZE FRAME DATA is available.
AT warning light illuminate if TCM detects the above malfunction condition
during first drive cycle.
DTC is stored in TCM memory.
Pressure control solenoid valve malfunction
Open circuit in wiring harness between pressure control solenoid valve terminal A
and TCM terminal 2X
Short to ground in wiring harness between pressure control solenoid valve
terminal A and TCM terminal 2X
Short to power supply in wiring harness between pressure control solenoid valve
terminal A and TCM terminal 2X
Damaged connector between pressure control solenoid valve and TCM
TCM malfunction
(w)
RX-8 Transmission (Manual & Auto)
Page 195

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