Pinpoint Test Purpose

To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.

1. AV1: CHECK THE PSCM DTCS 
   • Ignition ON, engine running.
   • Carry out the PSCM self-test.
   • Is DTC U0401 Invalid Data Received from the ECM/PCM present and active in the PSCM? 

     Yes	No
     Go to  AV2.	If the PSCM does NOT list DTC U0401 Invalid Data Received from the ECM/PCM, DISCONTINUE this test and REFER to the DTC Chart for diagnostic direction.

2. AV2: CHECK THE VEHICLE BATTERY AND CHARGING SYSTEM VOLTAGE 
   • Ignition ON, engine OFF.
   • Refer to CHARGING SYSTEM - GENERAL INFORMATION and carry out Pinpoint Test A: Battery Condition Test (battery state of charge).
   • Does the battery pass the condition test (battery state of charge)? 

     Yes	No
     Go to  AV3.	INSTALL a new battery. REFER to BATTERY, MOUNTING AND CABLES . Go to  AV3.

3. AV3: RECHECK THE PSCM DTCS 
   • Ignition ON, engine OFF.
   • Clear the PSCM DTCs.
   • Ignition OFF.
   • Wait at least 90 seconds for the modules to completely shut off.
   • Ignition ON, engine running.
   • Operate the system.
   • Carry out the PSCM self-test.
   • Is DTC U0401 Invalid Data Received from the ECM/PCM present and active in the PSCM? 

     Yes	No
     DIAGNOSE the PCM concern. REFER to ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) or ELECTRONIC ENGINE CONTROLS - 3.5L ECOBOOST (272KW/370PS) .	The concern is not present at this time and may have been set due to a low battery state of charge. The test is complete, no further action is required.