4A40 Dynamics Sensor-Implausible Signal/No Signal: Testing

WARNING: This page is about a different car, the 2009 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR A DTC 4A40 DYNAMICS SENSOR-IMPLAUSIBLE SIGNAL/NO SIGNAL
NOTE: This DTC must be active for the results of this test to be valid.
1. Turn the ignition on.
2. With the scan tool, read and record DTCs.
3. With the scan tool, read and record Freeze Frame information.
4. With the scan tool, erase DTCs.
5. Cycle the ignition switch from off to on.
6. With the scan tool, read and record DTCs.
  Does the scan tool display: 4A40 DYNAMICS SENSOR-IMPLAUSIBLE SIGNAL/NO SIGNAL?
  
  Yes
  - Go to step 2
  No
  - Refer to the INTERMITTENT CONDITION diagnostic procedure.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE
1. Check the Dynamics Sensor installation.
2. Check all related wiring for bruised, chafed, pierced, or partially broken wires.
3. Check all related connectors for broken, bent, pushed out, or corroded terminals.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
  No
  - Go to step 3
FUSED IGNITION SWITCH OUTPUT CIRCUIT

Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Dynamics Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage of the Fused Ignition Switch Output circuit at the Dynamics Sensor harness connector.
  Is the voltage above 10 volts?
  
  Yes
  - Go to step 4
  No
  - Repair the Fused Ignition Switch Output circuit for an open.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
GROUND CIRCUIT OPEN

Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance between the Ground circuit and ground.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the Ground circuit for an open.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
DYNAMICS SENSOR HIGH DATA LINK CIRCUIT OPEN

Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance of the Dynamics Sensor High Data Link circuit between the Anti-lock Brake Module and the Dynamics Sensor.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 6
  No
  - Repair the Dynamics Sensor High Data Link circuit for an open.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
CHECK THE DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR AN OPEN

Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance of the Dynamics Sensor Low Data Link circuit between the Anti-lock Brake Module and the Dynamics Sensor.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 7
  No
  - Repair the Dynamics Sensor Low Data Link circuit for an open.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
DYNAMICS SENSOR
1. Measure the voltage of the Dynamics Sensor High Data Link circuit at the Dynamics Sensor harness connector.
2. Measure the voltage of the Dynamics Sensor Low Data Link circuit at the Dynamics Sensor harness connector.
  Is voltage within 2-3 volts on each circuit?
  
  Yes
  - Replace the Dynamics Sensor in accordance with the Service Information.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .
  No
  - Replace the Anti-Lock Brakes Module in accordance with the Service Information.
  - Perform ABS VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure .