INSPECTION PROCEDURE 6: The Neutral Position Learning of the Steering Angular Velocity Sensor is not Detected.: Diagnosis

Required Special Tools:

MB991223: Harness Set
MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B

STEP 1. Check the front tires.
Q: Are the tire diameters different?
1. YES: Replace the appropriate tire and then go to Step 13.
2. NO: Go to Step 2.
STEP 2. Check the front suspension.
Q: Is the front suspension abnormal?
1. YES: Repair the front suspension and then go to Step 13.
2. NO: Go to Step 3.
STEP 3. Using scan tool MB991958, check data list.
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.
2. Start the engine.
3. Set scan tool MB991958 to data reading mode for following item.
  - Item 37: Steering angular sensor neutral position learning
4. Confirm the indicated ON/OFF state as follows:
Fig 1: Connecting scan tool MB991958 To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Checking Data List Table
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Q: Is the steering angular velocity sensor straight ahead position learning input normal?
1. YES: Go to Step 5.
2. NO: Confirm the steering angular velocity sensor is correctly installed. Then go to Step 4.
STEP 4. Check for steering angular velocity sensor output voltage.
1. Connect steering angular velocity sensor connector C-230.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage, by backprobing, between terminal 1 and ground, terminal 4 and ground, and terminal 5 and ground. The voltage should measure as indicated in the figure.
Fig 3: Checking Steering Angular Velocity Sensor Output Voltage
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 4: Voltage Chart
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Q: Is the steering angular velocity sensor output voltage normal?
1. YES: Go to Step 13.
2. NO: Replace the steering angular velocity sensor (Refer to LATERAL/LONGITUDINAL G-SENSOR CHECK .) and then go to Step 13.
STEP 5. Check the stoplight.
Q: Does the stoplight turn on and off normally?
1. YES: Go to Step 9.
2. NO: Go to Step 6.
STEP 6. Check the stoplight switch installation condition.
Q: Is the stoplight switch installed correctly?
1. YES: Check the stoplight switch (Refer to BRAKE PEDAL HEIGHT ). Then go to Step 7.
2. NO: Repair the installation of the stoplight switch (Refer to BRAKE PEDAL FREE PLAY ). Then go to Step 13.
STEP 7. Check the following connectors.
- Intermediate connectors C-129
- Stoplight switch connector C-102
Fig 5: Identifying Stoplight Switch Connector C-102 And Intermediate Connector C-129
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Check the connectors for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?
1. YES: Go to Step 8.
2. NO: Repair it and then go to Step 13.
STEP 8. Check the following harness wires.
- The wire between relay box in engine compartment (fuse No. 10) and stoplight switch connector C-102 (terminal 2)
  
  Fig 6: Identifying Fuse No.10
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
- The wire between stoplight switch connector C-102 (terminal 1) and stoplights
  
  Fig 7: Identifying Stoplight Switch Connector C-102
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Is any harness wire damaged?
1. YES: Repair or replace it and then go to Step 13.
2. NO: Go to Step 9.
STEP 9. Check the stoplight switch circuit. Measure the voltage at ABS-ECU connector B-118.
1. Disconnect ABS-ECU connector B-118 and measure at the harness side.
2. Depress the brake pedal to turn on the stoplight switch.
3. Measure the voltage between terminal 19 and ground. It should measure battery voltage (approximately 12 volts).
Fig 8: Measuring Voltage At ABS-ECU Connector B-118 Terminal 19 And Ground
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is battery positive voltage (approximately 12 volts) present?
1. YES: Go to Step 12.
2. NO: Go to Step 10.
STEP 10. Check the following connectors.
- ABS-ECU connector B-118
  
  Fig 9: Identifying ABS-ECU Connector B-118
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
- Joint connector C-105
  
  Fig 10: Identifying Joint Connector C-105
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
- Intermediate connector C-124
- Stoplight switch connector C-102
Check the connectors for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?
1. YES: Go to Step 11.
2. NO: Repair it and then go to Step 13.
STEP 11. Check the following harness wire.
- The wire between stoplight switch connector C-102 (terminal 1) and ABS-ECU connector B-118 (terminal 19)
Fig 11: Identifying Stoplight Switch Connector C-102
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 12: Identifying ABS-ECU Connector B-118
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the harness wire damaged?
1. YES: Repair or replace it and then go to Step 13.
2. NO: Go to Step 13.
STEP 12. Check the following connector.
- ABS-ECU connector B-118
Fig 13: Identifying ABS-ECU Connector B-118
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Check the connector for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connector and terminals in good condition?
1. YES: Replace the brake modulator hydraulic unit (integrated with ABS-ECU) (Refer to HYDRAULIC UNIT ). Then go to Step 13.
2. NO: Repair it and then go to Step 13.
STEP 13. Retest the system.
Q: Is the neutral position learning of the steering angular velocity sensor detected by the ABS system?
1. YES: The procedure is complete.
2. NO: Return to Step 1.