NUMBER: 07-96-15
DATE: 08/10/15
| APPLICABILITY: | 2012-14MY WRX Models (EXCEPT STI) |
| 2012-13MY Forester Turbo | |
| SUBJECT: | Design Change to Engine Wiring Harness |
INTRODUCTION
This Service Information bulletin reviews a design change to the engine wiring harness to eliminate improper diagnosis of the Evaporative Leak Check Module (ELCM) by the ECM which could set Diagnostic Trouble Code (DTC) P0451 in error. Some examples of other DTCs affected by this harness change are: P0068, P0452, P0453, P0107, P0108 and P0300. The change involves a repositioning of the sensor and actuator wiring ground junction point to a location unaffected by engine movement and high temperatures (near turbocharger) which may develop excessive resistance. Since this condition develops over time, DTC(s) may set very intermittently with long periods of time between occurrences. A more frequent occurrence of any of these DTC(s) may indicate a different root cause other than the condition described in this bulletin.
PART INFORMATION
| DESCRIPTION | PART NUMBER | APPLICABILITY |
|---|---|---|
| HARNESS-ENGINE | 24020AF071 | 2012MY WRX & Forester Turbo |
| 24020AF531 | 2013-14MY WRX & Forester Turbo |
NOTE: Although 2012MY Forester models are not equipped with the ELCM, this revised part number information remains applicable.
SERVICE PROCEDURE / INFORMATION
- Always follow the diagnostic procedure in the applicable Service Manual for the DTC(s) being diagnosed. The example DTCs listed in the Introduction section all involve components and sensors located on or near the intake manifold (e.g. intake manifold pressure sensor). They all supply ECM inputs and utilize the referenced common ground point. Any increase in resistance to ground can have significant effect on these sensor outputs to the ECM and cause DTC(s) to set.
- When replacing the engine wiring harness, the service procedure remains unchanged.
REMINDER: SOA strongly discourages the printing and/or local storage of service information as previously released information and electronic publications may be updated at any time.
Always refer to STIS for the latest service information before performing any repairs.
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I have a 2011 WRX which suffered from similar issues. I applied the solder rework fix (soldered ground wires at junction point over turbo). It has improved the behaviour greatly but hasn’t 100% eliminated the issues.
This article says that the wiring harness was updated for 2012-1014 models. What about 2011? Is it a different harness? Has it also been updated?
Thanks