DTC 117,: LOST COMMUNICATION WITH THE STEERING ANGLE SENSOR,ACURA MDX

DTC 117: LOST COMMUNICATION WITH THE STEERING ANGLE SENSOR
1. Clear the DTCs with the HDS (see General Troubleshooting Information ).
2. Turn the ignition switch to ON (II), then wait for 10 seconds.
3. Check for DTCs with the HDS (see General Troubleshooting Information ).
Is DTC 117 indicated?
YES -Go to step 4.
NO -Intermittent failure. The system is OK at this time. Check for loose or poor
connections.
4. Check for VSA system DTCs with the HDS (see PUMP MOTOR ).
Are any DTCs indicated?
YES -Troubleshoot the indicated VSA system DTC(s).
NO -Go to step 5.
5. Turn the ignition switch to LOCK (0)
6. Disconnect the steering angle sensor 5P connector.
7. Disconnect the ACC unit 20P connector.
8. Check for continuity between ACC unit 20P connector terminal No. 10 and steering
angle sensor 5P connector terminal No. 4, and between ACC unit 20P connector
terminal No. 20 and steering angle sensor 5P connector terminals No. 2.

2010 Acura MDX

2010-12 BRAKES Collision Mitigation Braking System (CMBS) - MDX



Fig. 10: Measuring Resistance Between ACC Unit 20P Connector And Steering Angle
Sensor 5P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Check for loose or poor connections. If OK, update the ACC unit (see ACC UNIT
UPDATE ), then recheck. if the ACC unit was already updated, replace the ACC unit
(see ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION ).
NO -Repair an open in the wire between the ACC unit and the steering angle sensor.

DTC 103,CMBS BRAKE CONTROL PROHIBITION,ACURA MDX

DTC 103: CMBS BRAKE CONTROL PROHIBITION
1. Check for VSA system DTCs with the HDS (see PUMP MOTOR ).
Are any DTCs indicated?
YES -Troubleshoot the indicated VSA system DTC(s).
NO -Go to step 2.
2. Clear the DTCs with the HDS (see General Troubleshooting Information ).
3. Watch the CMBS indicator.
Does the CMBS indicator come on?
YES -Go to step 4.

2010 Acura MDX

2010-12 BRAKES Collision Mitigation Braking System (CMBS) - MDX


NO -The system is OK at this time.
4. Check for ACC system DTCs with the HDS (see HOW TO RETRIEVE DTCS ).
Is DTC 103 indicated?
YES -Check for loose or poor connections. If OK, update the ACC unit (see ACC UNIT
UPDATE ), then recheck. If the ACC unit was already updated, replace the ACC unit,
(see ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION )
NO -Troubleshoot the indicated DTC(s).

DTC 100,CMBS INITIAL CHECK INCOMPLETE,Acura MDX

DTC 100: CMBS INITIAL CHECK INCOMPLETE

If the CMBS initial check is incomplete, the ACC and CMBS indicators come on. For the
CMBS to operate properly, always do the CMBS initial check after replacing the ACC unit
or the VSA modulator-control unit.
1. Turn the ignition switch to ON (II), then wait for 10 seconds.
2. Watch the VSA indicator.
Does the VSA indicator come on?
NOTE: The CMBS initial check function checks the communication between the
adaptive cruise control (ACC) unit and the VSA modulator-control unit.

2010 Acura MDX

2010-12 BRAKES Collision Mitigation Braking System (CMBS) - MDX


YES -Troubleshoot the indicated VSA system DTC(s).
NO -Go to step 3.
3. Check for VSA system DTCs with the HDS (see PUMP MOTOR ).
Are any DTCs indicated?
YES -Troubleshoot the indicated VSA system DTC(s).
NO -Go to step 4.
4. Start the engine.
5. Select CMBS from the DRIVING SUPPORT menu, then enter the MISCELLANEOUS TEST.
6. Do the CMBS brake operation.
7. Watch the ACC and CMBS indicators.
Do both indicators come on?
YES -Go to step 8.
NO -The system is OK at this time. The CMBS initial check is complete.
8. Check for ACC system DTCs with the HDS (see HOW TO RETRIEVE DTCS ).
Are any DTCs except DTC 100 indicated?
YES -Troubleshoot the indicated DTC(s).
NO -Check for loose or poor connections. If OK, update the ACC unit (see ACC UNIT
UPDATE ), then recheck. If the ACC unit was already updated, replace the ACC unit,
(see ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION )

DTC 64, CMBS OPERATION ERROR (EXCESSIVE OPERATION),ACURA MDX

DTC 64: CMBS OPERATION ERROR (EXCESSIVE OPERATION)

1. Remove the front grille (see FRONT BULKHEAD COVER REPLACEMENT ).
2. Inspect the frame for warpage, and check the installation of the millimeter wave
radar and the main bracket.
Is the installation and the frame OK?
YES -Go to step 3.
NOTE: If the CMBS operates frequently, DTC 64 is stored.

2010 Acura MDX

2010-12 BRAKES Collision Mitigation Braking System (CMBS) - MDX


NO -Reinstall the components correctly, or replace if damaged, then go to step 3.
3. Turn the ignition switch to ON (II), then wait for 10 seconds.
4. Aim the millimeter wave radar (see MILLIMETER WAVE RADAR AIMING ).
5. Clear the DTCs with the HDS (see General Troubleshooting Information ).
6. Press the MAIN switch ON.
7. Watch the ACC and CMBS indicators.
Do both indicators come on?
YES -Go to step 8.
NO -Intermittent failure, the system is OK at this time. Check for loose or poor
connections.
8. Clear the DTCs with the HDS (see General Troubleshooting Information ).
9. Watch the CMBS indicator.
Does the CMBS indicator come on?
YES -Go to step 10.
NO -Intermittent failure, the system is OK at this time. Check for loose or poor
connections.
10. Check for DTCs with the HDS (see General Troubleshooting Information ).
Is DTC 64 indicated?
YES -Check for loose or poor connections. If OK, update the ACC unit (see ACC UNIT
UPDATE ), then recheck. If the ACC unit was already updated, replace the ACC unit,
(see ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION )
NO -Troubleshoot the indicated DTC(s).

DTC 34,DTC 35, Acura MDX,MASTER CYLINDER BRAKE FLUID PRESSURE SENSOR

DTC 34: MASTER CYLINDER BRAKE FLUID PRESSURE SENSOR CIRCUIT OPEN/SHORT;
DTC 35: MASTER CYLINDER BRAKE FLUID PRESSURE SENSOR CENTER POSITION
ERROR; DTC 36: MASTER CYLINDER BRAKE FLUID PRESSURE SENSOR SHIFT ERROR
1. Clear the DTCs with the HDS (see General Troubleshooting Information ).
2. Watch the ACC indicator.
Does the ACC indicator go off?
YES -Intermittent failure, the system is OK at this time. Check for loose or poor
connections.
NO -Go to step 3.
3. Press the brake pedal.
4. Watch the ACC indicator.
Does the ACC indicator go off?
YES -Intermittent failure, the system is OK at this time. Check for loose or poor
connections.
NO -Go to step 5.
5. Check for DTCs with the HDS (see General Troubleshooting Information ).
Is DTC 34, 35, or 36 indicated?
YES -Go to step 6.
NO -Troubleshoot the indicated DTC(s).
6. With the brake pedal released, check the master cylinder brake fluid pressure
voltage (BRAKE P) with the HDS.
Is there about 0.5 V?
YES -Go to step 7.
NO -Check the VSA system.
7. Test the brake booster (see MASTER CYLINDER INSPECTION ).
8. Start the engine, then press the brake pedal with about 314 N (32 kgf, 70.6 lbf)
pressure.
9. Check the master cylinder brake fluid pressure voltage (BRAKE P) with the HDS.
Is there about 2.5 V?
YES -Go to step 10.
NO -Check the VSA system.
10. Check the brake switch signal (BRAKE SW (N.O.)) with the HDS.
Does the indication show ON when the brake pedal is pressed, and show OFF when the
brake pedal is released?
YES -Check for loose or poor connections. If OK, update the ACC unit (see ACC UNIT
UPDATE ), then recheck. If the ACC unit was already updated, replace the ACC unit
(see ADAPTIVE CRUISE CONTROL (ACC) UNIT REMOVAL/INSTALLATION ).
NO -Go to step 11.
11. Check for DTCs with the HDS (see General Troubleshooting Information ).
Is DTC 60, 110, or 111 indicated?
YES -Troubleshoot the indicated DTC(s).
NO -Troubleshoot the brake pedal position switch signal circuit (see BRAKE PEDAL
POSITION SWITCH SIGNAL CIRCUIT TROUBLESHOOTING ).