Electronic Pressure Control (EPC) Solenoid 5R44E And 5R55E Only

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DIAGNOSTIC TROUBLE CODE CHART

DTC P1746, P1747	ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID 5R44E AND 5R55E ONLY
DETECTION CONDITION	P1746 indicates EPC solenoid circuit open. P1747 indicates EPC solenoid circuit shorted.
POSSIBLE CAUSE	Wiring concerns: Open or short in vehicle harness. Damaged harness or connector. Damaged EPC solenoid. Damaged PCM.
HINT	EPC solenoid description A variable force style (VFS) solenoid an electro-hydraulic actuator combining a solenoid and a regulating valve. Current to the EPC solenoid varied by the PCM. Regulates transmission line pressure and line modulator pressure by producing resisting forces to the main regulator and line modulator circuits.

DIAGNOSTIC TROUBLE CODE CHART

DTC P1746, P1747		ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID 5R44E AND 5R55E ONLY
STEP	INSPECTION		ACTION
1	Was PCM Quick Test performed?	Yes	Go to step 2.
1	Was PCM Quick Test performed?	No	Perform PCM Quick Test. See PCM QUICK TEST , .
2	SOLENOID FUNCTIONAL TEST Key ON, Engine OFF (KOEO). Enter output state control mode using WDS or equivalent tester. Install 300 psi pressure gauge into EPC tap. Fig 1: Installing 300 PSI Pressure Gauge Into EPC Tap Courtesy of MAZDA MOTORS CORP. Monitor pressure gauge. Enter Parameter; EPC Mode. Select value -15, 30, 45, 60, 70 or 90 PSI. Press SEND. Select another value 0-90 psi. Press SEND. Enter SPC XXX Mode. Press SEND. Does the pressure reading match the commanded pressure ?	Yes	Clear DTCs.
2		No	Go to step 3.
3	CHECK FOR BATTERY VOLTAGE Remove oil pan. See AUTOMATIC TRANSMISSION OIL PAN (GASKET AND OIL STRAINER) REMOVAL / INSTALLATION , . Visually inspect all wires and connectors for damage. Key ON. Connect DVOM positive lead to VPWR solenoid terminal and negative lead to a good ground. Is the battery voltage present?	Yes	Go to step 4.
3		No	Check for open or short circuit in VPWR harness. Repair as necessary. Go to step 7.
4	ELECTRICAL SIGNAL CHECK Leave positive lead connected to VPWR solenoid terminal and connect negative lead to the signal terminal of the EPC solenoid. Turn the solenoids ON and OFF, while monitoring the voltage reading on the DVOM, solenoid state on the WDS or equivalent tester (ON and OFF), listen for the solenoid to activate (click). Enter Trans-Bench Mode. Enter Parameter; EPC Mode. Select a value 0-90 psi. Press SEND. Select another value 0-90 psi. Press SEND. Enter SPC XXX Mode. Press SEND. Does the voltage and solenoid state change?	Yes	Go to step 5.
4		No	Check for open or short circuit in SIG harness. Repair if necessary. If OK, replace PCM. See POWERTRAIN CONTROL MODULE (PCM) INSPECTION , . Go to step 7.
5	CHECK SOLENOID RESISTANCE AT SOLENOID Disconnect transmission harness connector. Measure solenoid resistance by connecting an ohmmeter at the terminals of the solenoids. Is the resistance within 3.10-5.7 ohms?	Yes	Go to step 6.
5		No	Replace the solenoid. See TRANSMISSION SOLENOID REMOVAL / INSTALLATION , . Go to step 7.
6	CHECK SOLENOID FOR SHORT TO GROUND Check for continuity between engine ground and the EPC solenoid terminals with ohmmeter. Is there continuity?	Yes	Replace the solenoid. See TRANSMISSION SOLENOID REMOVAL / INSTALLATION , . Go to step 7.
6		No	See SYMPTOM TROUBLESHOOTING CHART - AUTOMATIC TRANSMISSION .
7	VERIFY TROUBLESHOOTING OF DTCs COMPLETED Make sure to reconnect all disconnected connectors. Clear DTCs from PCM memory using WDS or equivalent tester generic OBD-II function. Perform PCM Quick Test. Is same DTC present?	Yes	Replace PCM and repeat PCM Quick Test.
7		No	If any other DTC is present, go to applicable DTC inspection. If no DTC is present, troubleshooting complete.