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P0988-4C PRESSURE SWITCH RATIONALITY (CONTINUED) Diagnostic Test 1. DETERMINING IF RELATED RELAY DTC’S ARE PRESENT With the scan tool, check for other transmission DTC’s. Are there any Transmission Control Relay related DTC’s present? Yes >> Refer to the Transmission category and perform the appropriate symptom. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. No >> Go To 2 2. EATX DTC DATA SHOW CURRENT DTC With the scan tool, check the EATX DTC EVENT DATA. Does the EATX DTC EVENT DATA show data for DTC P0988? Yes >> Go To 3 No >> Refer to the Transmission category and perform the appropriate symptom shown in the EATX DTC EVENT DATA. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. 3. MULTIPLE DTCS PRESENT With the scan tool, check for other transmission DTC’s. Are there two or more related Pressure Switch Sense DTCs present in addition to P0988? Yes >> Go To 4 No >> Go To 7 4. RELATED DTC PRESENT 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 Do all the pressure switches read CLOSED in the EATX DTC EVENT DATA for P0988? Yes >> Refer to Transmission category and perform diagnostics for the DTC P0888. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. No >> Go To 5 5. EATX DTC EVENT DATA READ OPEN In the EATX DTC EVENT DATA recorded earlier, read the state of all pressure switches. Do all the pressure switches read OPEN? Yes >> Go To 6 No >> Go To 7 21 - 246 AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS WK |