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A/T 4TH GEAR FUNCTION TM-403 < COMPONENT DIAGNOSIS > [TYPE 2 (4AT: RE4F03B)] C E F G H I J K L M A B TM N O P A/T 4TH GEAR FUNCTION Description INFOID:0000000001713091 • This malfunction will not be detected while the OD OFF indicator lamp is indicating another self-diagnosis malfunction. • This malfunction is detected when the A/T does not shift into fourth gear position or the torque converter clutch does not lock up as instructed by the TCM. This is not caused by electrical malfunction (circuits open CONSULT-III REFERENCE VALUE IN DATA MONITOR MODE Remarks: Specification data are reference values. On Board Diagnosis Logic INFOID:0000000001713092 • Diagnostic trouble code “A/T 4TH GR FNCTN” with CONSULT-III is detected when A/T cannot be shifted to the 4th gear position even if electrical circuit is good. • This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM as follows: • Gear positions supposed by TCM are as follows. In case of gear position with no malfunctions: 1, 2, 3 and 4 positions Possible Cause INFOID:0000000001713093 • Shift solenoid valve A DTC Confirmation Procedure INFOID:0000000001713094 CAUTION: • Always drive vehicle at a safe speed. least 10 seconds before continuing. After the repair, perform the following procedure to confirm the malfunction is eliminated. WITH CONSULT-III 1. Start engine and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III. 2. Touch “START”. Gear position 1 2 3 4 Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed) Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open) Item name Condition Display value (Approx.) LINE PRES DTY Small throttle opening (Low line pressure) ⇔ Large throttle opening (High line pressure) 0% ⇔ 94% |