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2.2 Electronic Automatic Transmission Control (ETC)   >   13 Diagnosis - Complaint Related Diagnostic Chart

Complaint/Problem Possible cause Test step/Remedy 1) Customer complaint: Transmission does not shift into 5GR or 4GR (vague complaint) Determine exact complaint by performing a test drive 11 Customer complaint: Transmission intermittently does not shift into 5GR Multiple 4-5 to 5-4 shifts occuring in a short period of time will delay the 5 GR upshift in order to prevent thermal overload of the overdrive brake. Normal operation of the transmission overload protection Model 140 with LH-SFI only Transmission shifts into 5GR only under WOT Vacuum line from intake manifold and DI control module (N1/3) not connected or leaking. Re-connect or replace vacuum line Transmission shifts 3 5, DTC Valve block connector (Y3/1x1) on transmission not reconnected after repair work with engine speed > 1000 rpm Erase DTC If DTC reappears 23 9.0 Transmission occasionally does not shift into 5GR Loose contact on 5-speed AT/engine connector (X22/5) Repair loose contact Model 140 with HFM-SFI only Transmission does not shift into 5GR , DTC Wrong TCM (N15/1) installed Verify and install correct TCM (N15/1) Hard shifting 4 5 or 5 4 or hunts 4 5 4 Valve block control valve (Y31y2) defective (resistance) Replace Y3/1y2 1) Observe Preparation for Test, see 22.