Test AE: Unable To Activate Self-Test/Network Communication Error
PINPOINT TEST AE: UNABLE TO ACTIVATE SELF-TEST/NETWORK COMMUNICATION ERRORFlow Chart:
This pinpoint test is intended to diagnose the following:
- unable to communicate with the PCM
- unable to activate the PCM self-test
- harness circuits: VPWR, VREF and PWRGND
PCM Connector
PCM Connector:
------------------------------------------
AE1 : CARRY OUT A VEHICLE INSPECTION AND VERIFY THE SELF-TEST PROCEDURE
NOTE: The scan tool resets if battery voltage is less than 9.5 volts. If carrying out repeated self-tests, disable the glow plug control module (GPCM) and disregard the glow plug codes while the GPCM is disabled. If equipped with a power take-off (PTO) system, it must be disabled while carrying out the PCM self-tests.
- Check the battery voltage
- Verify that the correct procedure was used to activate the self-test for the scan tool. Refer to Diagnostic Methods. Testing and Inspection
- Was the correct self-test procedure used?
------------------------------------------
AE2 : CARRY OUT THE NETWORK TEST
- Ignition ON, engine OFF.
- Carry out the network test.
- Do all modules indicate pass?
------------------------------------------
AE3 : CHECK THE PCM VPWR CIRCUITS FOR VOLTAGE
- Ignition OFF.
- PCM connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Are the voltages greater than 10.5 V?
------------------------------------------
AE4 : CHECK THE PWRGND CIRCUITS FOR AN OPEN
- Ignition OFF.
- Measure the resistance between:
- Are the resistances less than 5 ohms?
------------------------------------------
AE5 : CHECK THE VREF CIRCUITS FOR A SHORT TO GROUND
- PCM connector disconnected.
- Measure the resistance between:
- Are the resistances greater than 10K ohms?
