Ignition System - DTC's P0301/P0302/P0303/P0304
NUMBER: 07-60-07RDATE: 04/25/07
APPLICABILITY:
2000MY and Later Legacy/Outback
25L SOHC Vehicles
1999MY and Later Impreza and
Forester 25L SOHC Vehicles
SUBJECT:
Ignition Coil and High Tension Cables
INTRODUCTION
When diagnosing for misfire code(s) P0301 P0302 P0303 and/or P0304 there is the possibility that the ignition coil and/or high tension cables could be the cause In addition to the information published in the service manual, use the following procedure to check the ignition coil and high tension cables.
PRODUCTION LINE CHANGE
The new style high tension cables have been used in production with the VINs shown.
REPAIR PROCEDURE/INFORMATION
Step 1) Ignition Coil Inspection
Check the tower portion of the ignition coil for carbon tracks (leakage) If leakage is more than 5mm long, the ignition coil and high tension cables should be replaced (see Figure 1).
Step 2) High Tension Cable Inspection
Check the high tension cables for carbon tracks (leakage) If leakage is evident, the high tension cables should be replaced and the ignition coil cleaned (see Figure 2 and refer to Step 3).
Step 3) Ignition Coil Cleaning Procedure (if carbon track is less than 5 mm)
^ If there is any evidence of carbon, clean the surface of the ignition coil using a clean, soft rag dampened with water.
^ Permit the ignition coil to dry.
^ Clean the same area of the ignition coil using a clean soft rag dampened with Isopropyl alcohol.
^ Permit the ignition coil to dry.
Note:
Do not insert the high tension cables until the ignition coil is dry.
PART INFORMATION
The high tension cables for Impreza and Forester have changed to a silicone rubber boot which has a shiny appearance Please note that the part numbers have not changed The Legacy and Outback high tension cables also have a silicone rubber boot.
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