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P0988-4C PRESSURE SWITCH RATIONALITY (CONTINUED) 6. LOW LINE PRESSURE In the EATX DTC EVENT DATA recorded earlier, compare the Line Pressure and the Desired Line Pressure. Is the Line Pressure less than 40 psi, and significantly below the Desired Line Pressure? Yes >> Repair as necessary to correct low line pressure. Check fluid level and adjust as necessary. If fluid level is OK, check the Primary Oil Filter seal for a split, crack, or improperly installed. If the filter and seal are Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. No >> Replace the Transmission Solenoid/TRS Assembly per the Service Information. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. 7. DTC P0871 ALSO PRESENT With the scan tool, check Transmission DTCs. Is the DTC P0871 also present? Yes >> Refer to the Transmission category and perform the appropriate symptom. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. No >> Go To 8 8. EATX DTC EVENT DATA READ PARK REVERSE OR NEUTRAL With the scan tool, check the EATX DTC EVENT DATA for P0988. NOTE: Make sure to record all EATX DTC EVENT DATA stored in the scan tool for future reference in this Does the EATX DTC EVENT DATA show the DTC set in Park, Neutral, or Reverse for P0988? Yes >> Go To 13 No >> Go To 9 9. EATX DTC EVENT DATA READ CLOSED With the scan tool, check the EATX DTC EVENT DATA for P0988. NOTE: Make sure to record all EATX DTC EVENT DATA stored in the scan tool for future reference in this Does the EATX DTC EVENT DATA show the 4C Pressure Switch reading CLOSED? Yes >> Go To 11 No >> Go To 10 21 - 508 AUTOMATIC TRANSMISSION - 545RFE - ELECTRICAL DIAGNOSTICS DR/DH |