Pinpoint Tests QA: Unable To Activate Self-Test/Network Communication Error: Introduction
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
Harness Side
| Circuit | Pin |
|---|---|
| ETCREF (Electronic Throttle Control Reference Voltage) | 5 |
| ETCRTN (Electronic Throttle Control Return) | 4 |
Harness Side
| Circuit | Pin |
|---|---|
| ISP-R (Ignition Switch Position Run) | B8 |
| KAPWR (Keep Alive Memory Power) | B10 |
| PCMRC (PCM Relay Control) | B1 |
| VPWR (Vehicle Power) | B11 |
| VPWR (Vehicle Power) | B12 |
| PWRGND (Power Ground) | T31 |
| PWRGND (Power Ground) | B35 |
| PWRGND (Power Ground) | B36 |
| PWRGND (Power Ground) | B47 |
| PWRGND (Power Ground) | B48 |