Pinpoint Test K: DTC U0121:00

Active Park Assist

Pinpoint Tests

Pinpoint Test K: DTC U0121:00

Refer to Wiring Diagram Set 131 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Parking Aid for schematic and connector information. Diagrams By Number

Normal Operation
- DTC U0121:00 (Lost Communication With Anti-Lock Brake System (ABS) Control Module: No Sub-Type Information) - sets in the Parking Aid Module (PAM) if data messages received from the ABS module over the High Speed Controller Area Network (HS-CAN) are missing after the active park assist system is activated. For a complete list of all network messages, refer to Module Communications Network Testing and Inspection.

This pinpoint test is intended to diagnose the following:

- ABS module
- PAM


PINPOINT TEST K: DTC U0121:00

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K1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to K2.

No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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K2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the ABS module pass the network test?

Yes
GO to K3.

No
REFER to Module Communications Network Testing and Inspection.

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K3 RECHECK THE PAM DTCs

- Clear the DTCs.
- Operate the system and test the system for normal operation.
- Repeat the PAM self-test.
- Is DTC U0121:00 still present?

Yes
GO to K4.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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K4 CHECK FOR DTC U0121 OR DTC U0121:00 IN OTHER MODULES

- Clear all DTCs.
- Ignition OFF.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0121 or DTC U0121:00 set in any module?

Yes
INSTALL a new ABS module. REFER to Vehicle Dynamic Systems Service and Repair. TEST the system for normal operation.

No
GO to K5.

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K5 CHECK FOR CORRECT PAM OPERATION

- Disconnect the PAM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the PAM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new PAM. REFER to Parking Aid Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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