Pinpoint Tests QA: Unable To Activate Self-Test/Network Communication Error: Introduction
WARNING: This page is about a different car, the 2015 Lincoln MKZ, 2015 Ford Fusion, and 2015 Ford C-Max. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
This pinpoint test is intended to diagnose the following:
- unable to communicate with the powertrain control module (PCM)
- incorrect self-test procedure
- harness circuits: B+, ETCREF, GND, ISP-R, PWRGND and VPWR
| Pin | Circuit |
|---|---|
| 4 | ETCRTN (Electronic Throttle Control Return) |
| 5 | ETCREF (Electronic Throttle Control Reference Voltage) |
| Pin | Circuit |
|---|---|
| B35, B36, B47, B48, T31 | PWRGND (Power Ground) |
| B11, B12 | VPWR (Vehicle Power) |
| B1 | PCMRC (PCM Relay Control) |
| B8 | ISP-R (Ignition Switch Position Run) |