DTC P1746, P1747: Electronic Pressure Control Solenoid 5R44E And 5R55E Only

Fig 1: DTC P1746, P1747 - Detection Conditions And Possible Causes

Courtesy of MAZDA MOTORS CORP.

DTC P1746, P1747 ELECTRONIC PRESSURE CONTROL SOLENOID 5R44E AND 5R55E ONLY

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.
		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. See figure below. 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.
		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.
		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.
		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.
		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.
		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.
		No	If any other DTC is present, go to applicable DTC inspection. If no DTC is present, troubleshooting complete.