DTC 47

DTC 47: Pressure Sensor System (Abnormal Power Supply)

PRESSURE SENSOR SYSTEM CIRCUIT
Refer to DTC 45. DTC 45

CIRCUIT OPERATION
Refer to DTC 45. DTC 45

DTC SET CONDITIONS
DTC 47 is set when the pressure sensor power supply voltage is above 4.0 volts during pressure sensor power OFF or less than 4.0 volts during pressure sensor power ON.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
^ Malfunction of the pressure sensor
^ Damaged harness and connector
^ Malfunction of the AWD-ECU

DIAGNOSIS
Required Special Tool:
^ MB991958: Scan Tool (M.U.T-III Sub Assembly)
^ MB991824: V.C.I.
^ MB991827: USB Cable
^ MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 19: Pressure Sensor Power Supply.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the LOCK (OFF) position before connecting or disconnecting scan tool MB991958.





1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 19: Pressure Sensor Power Supply.
^ The voltage should measure approximately 5 volts.

4) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the sensor operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Go to Step 2.

STEP 2. Measure the pressure sensor power supply voltage at AWD-ECU connector C-138 by backprobing.








1) Turn the ignition switch to the ON position.
2) Measure the voltage between AWD-ECU connector C-138 terminal 43 and ground by backprobing.
^ The voltage should measure approximately 5 volts.

3) Turn the ignition switch to the Lock (OFF) position.
Q: Is the measured voltage approximately 5 volts?
YES: Go to Step 3.
NO: Go to Step 5.

STEP 3. Check AWD-ECU connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 4.
NO: Repair or replace the damaged components.

STEP 4. Using scan tool MB991958, check data list item 19: Pressure Sensor Power Supply.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the LOCK (OFF) position before connecting or disconnecting scan tool MB991958.





1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 19: Pressure Sensor Power Supply.
^ The voltage should measure approximately 5 volts.

4) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the sensor operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Replace the AWD-ECU.

STEP 5. Check pressure sensor connector B-30 and AWD-ECU connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.








Q: Are the connectors and terminals in good condition?
YES: Go to Step 6.
NO: Repair or replace the damaged components.

STEP 6. Check the harness for open circuit or short circuit to ground between pressure sensor connector B-30 terminal 1 and AWD-ECU connector C-138 terminal 43.

Q: Is the harness wire in good condition?
YES: Replace the pressure sensor.
NO: Repair or replace the harness wire.