Pinpoint Test J: DTC U0155

Parking Aid - Expedition

Pinpoint Tests

Pinpoint Test J: DTC U0155

Normal Operation

The Parking Aid Module (PAM) receives network messages from the Instrument Cluster (IC) via the Medium Speed Controller Area Network (MS-CAN). As more than one module receives each of the IC messages, all modules receiving that particular message should exhibit a symptom if the message is missing.

- DTC U0155 (Lost Communication With The Instrument Cluster) - sets in the PAM if data messages received from the IC over the Medium Speed Controller Area Network (MS-CAN) are missing for greater than 5 seconds with the ignition in RUN.

This pinpoint test is intended to diagnose the following:

- Communication network concern
- PAM
- IC



PINPOINT TEST J: DTC U0155

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J1 CHECK FOR LOST COMMUNICATION DTCs


- Ignition ON.
- Clear continuous DTCs from all modules.
- Ignition OFF.
- Wait at least 10 seconds.
- Retrieve all continuous DTCs from all modules.
- Is DTC U0155 set in the PAM?

Yes
GO to J2.

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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J2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs


- Carry out the self-test for the PAM and the IC.
- Is DTC B1317 or DTC B1318 recorded in any module?

Yes
For a parking aid system concern, REFER to DTC Charts. Parking Aid

For the IC, REFER to Instrument Panel, Gauges and Warning Indicators.

No
GO to J3.

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J3 CHECK FOR DTC U0155 OR DTC U0155:00 SET IN MULTIPLE MODULES


- Review the recorded results from the self-test.
- Is DTC U0155 or DTC U0155:00 set in more than one module?

Yes
If there is an observable symptom, GO to Symptom Chart to diagnose the observed symptom. Parking Aid

If there is no observable symptom, DISREGARD the DTC.

No
GO to J4.

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J4 CHECK FOR CORRECT IC OPERATION


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

Yes
INSTALL a new IC. REFER to Instrument Panel, Gauges and Warning Indicators. CLEAR all continuous DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all continuous DTCs. REPEAT the self-test.

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