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DTC 31

DTC 31: Steering Angular Velocity Sensor System

Steering Angulay Velocity Sensor System Circuit:























CIRCUIT OPERATION
The steering angular velocity sensor detects the neutral position and steering angle of the steering wheel by the photointerruptor (ST-1, ST-2 or ST-N), and sends them to the AWD-ECU.

DTC SET CONDITIONS
DTC 31 is set when open circuit or short circuit of the steering angular velocity sensor output line (ST-1, ST-2, or ST-N) occurs.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
^ Malfunction of the steering angular velocity sensor
^ Damaged harness wires and connectors
^ 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 items 21, 22, 23: Steering Angular Velocity Sensor Voltage.

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 the ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 21: Steering Angular Velocity Sensor Voltage
^ Item 22: Steering Angular Velocity Sensor Voltage
^ When the steering wheel is turned, 1 - 2 Volts and 2.5 - 4.5 Volts are displayed alternately.
^ Item 23: Steering Angular Velocity Sensor Voltage
^ When the steering wheel is fixed at the neutral position, 1 - 2 Volts is displayed, and when the steering wheel is turned, 2.5 - 4.5 Volts is displayed.

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 steering angular velocity sensor voltage at AWD-ECU connector C-138 by backprobing.








1) Turn the ignition switch to the ON position.
2) Measure the voltage between the following terminals of AWD-ECU connector C-138 and ground while turning the steering wheel.
^ Terminal 33
^ Terminal 34
^ Terminal 44
^ Changes between approximately 1.5 Volts and 3.5 Volts.

3) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the check result normal?
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 items 21, 22, 23: Steering Angular Velocity Sensor Voltage.





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 the ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 21: Steering Angular Velocity Sensor Voltage
^ Item 22: Steering Angular Velocity Sensor Voltage
^ When the steering wheel is turned, 1 - 2 Volts and 2.5 - 4.5 Volts are displayed alternately.
^ Item 23: Steering Angular Velocity Sensor Voltage
^ When the steering wheel is fixed at the neutral position, 1 - 2 Volts is displayed, and when the steering wheel is turned, 2.5 - 4.5 Volts is displayed.

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 intermediate connector C-122, AWD-ECU connector C-138 and steering angular velocity sensor connector C-230 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 to ground between AWD-ECU connector C-138 (terminals 33, 34, 44) and steering angular velocity sensor connector C-230 (terminals 5, 4, 1).








Q: Is the harness wire in good condition?
YES: Go to Step 7.
NO: Repair or replace the harness wire.

STEP 7. Measure the voltage at steering angular velocity sensor connector C-230.








1) Disconnect the steering angular velocity sensor connector C-230, and measure the voltage between terminal 2 and ground at the harness side.
2) Turn the ignition switch to the ON position.
^ The voltage should measure battery positive voltage.

3) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 10.
NO: Go to Step 8.

STEP 8. Check joint connector (2) C-101, junction block connector C-210 and C-211, steering angular velocity sensor connector C-230 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 9.
NO: Repair or replace the damaged components.

STEP 9. Check the harness for open circuit or short circuit to ground between the ignition switch and steering angular velocity sensor connector C-230 terminal 2.





Q: Is the harness wire in good condition?
YES: Go to Step 10.
NO: Repair or replace the harness wire.

STEP 10. Measure the voltage at steering angular velocity sensor connector C-230.








1) Disconnect the steering angular velocity sensor connector C-230, and measure the resistance between terminal 3 and ground at the harness side.
^ The resistance should measure less than 2 ohms.
Q: Is the measured resistance less than 2 ohms?
YES: Go to Step 4.
NO: Go to Step 11.

STEP 11. Check joint connector (3) C-06 and steering angular velocity sensor connector C-230 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 12.
NO: Repair or replace the damaged components.

STEP 12. Check the harness for open circuit to ground between the ignition switch and the steering angular velocity sensor connector C-230 terminal 3 and ground.





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