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Automatic Transaxle Control System (A6LF2) - 2.0L: Diagnosis Kia Optima III

Automatic Trans 18 illustrations ~1464 words

Fault Diagnosis

Features a fail-safe mechanism that prevents dangerous situations from developing in the event of a transaxle failure. The limp home mode engages if the transaxle malfunctions. In this mode, the transaxle operates at a minimal functionality level, making it possible for the vehicle to reach a service center.

Fail-Safe: Prevents dangerous situations from developing in the event of a malfunction.

Limp Home: Maintains minimal functionality (*) in the event of a malfunction, making it possible for the vehicle to reach a service center.

(*) Minimal Functionality: Drive (fixed gear setting), Reverse, and Neutral.

Self-Diagnosis

TCM is in constant communication with the control system's components (sensors and solenoids). If an abnormal signal is received for longer than the predefined duration, TCM recognizes a fault, stores the fault code in memory, and then sends out a fault signal through the self-diagnosis terminal. Such fault codes are independently backed up and will not be cleared even if the ignition switch is turned off, the battery is disconnected, or the TCM connector is disconnected.

CAUTIONDisconnecting a sensor or an actuator connector while the ignition switch is in the "On" position generates a diagnostic trouble code (DTC) and commits the code to memory. In such event, disconnecting the battery will not clear the fault diagnosis memory. The diagnosis tool must be used to clear the fault diagnosis memory.
CAUTIONBefore removing or installing any part, read the diagnostic trouble codes and then disconnect the battery negative (-) terminal. Before disconnecting the cable from battery terminal, turn the ignition switch to OFF. Removal or connection of the battery cable during engine operation or while the ignition switch is ON could cause damage to the TCM. When checking the generator for the charging state, do not disconnect the battery '+' terminal to prevent the ECM from damage due to the voltage. When charging the battery with the external charger, disconnect the vehicle side battery terminals to prevent damage to the TCM.

Checking Procedure (Self-Diagnosis)

CAUTIONWhen battery voltage is excessively low, diagnostic trouble codes can not be read. Be sure to check the battery for voltage and the charging system before starting the test. Diagnosis memory is erased if the battery or the TCM connector is disconnected. Do not disconnect the battery before the diagnostic trouble codes (DTC) are completely read and recorded.

Inspection Procedure (Using The GDS)

  1. Turn OFF the ignition switch.
  2. Connect the GDS to the data link connector on the lower crash pad.
  3. Turn ON the ignition switch.
  4. Use the GDS to check the diagnostic trouble code.
  5. Repair the faulty part from the diagnosis chart.
  6. Erase the diagnostic trouble code.
  7. Disconnect the GDS. CAUTION: Perform TCM learning after replacing the automatic transaxle to prevent slow automatic transaxle response, jerky acceleration and jerky startup. Refer to «AUTOMATIC TRANSAXLE CONTROL SYSTEM (REPAIR PROCEDURES)»(ref-429561-S07760757512011101500000) . Adding automatic transaxle fluid. Refer to «HYDRAULIC SYSTEM (FLUID)»(ref-429560-S16638232802011101500000) . After servicing the automatic transaxle or TCM, clear the diagnostic trouble code (DTC) using the GDS tool. Diagnostic trouble codes (DTC) cannot be cleared by disconnecting the battery.

TCM Problem Inspection Procedure

  1. TEST TCM GROUND CIRCUIT: Measure resistance between TCM and chassis ground using the backside of TCM harness connector as TCM side check point. If the problem is found, repair it. Specification: Below 1ohms
  2. TEST TCM CONNECTOR: Disconnect the TCM connector and visually check the ground terminals on TCM side and harness side for bent pins or poor contact pressure. If the problem is found, repair it.
  3. If problem is not found in Step 1 and 2 , the TCM could be faulty. If so, make sure there were no DTC's before swapping the TCM with a new one, and then check the vehicle again. If DTC's were found, examine this first before swapping TCM.
  4. RE-TEST THE ORIGINAL TCM: Install the original TCM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original TCM with a new one. If problem does not occur, this is intermittent problem. Refer to "Intermittent Problem Inspection Procedure" in «BASIC INSPECTION PROCEDURE»(ref-429551-S35236120592011101500000) .

Scheme 73

Scheme 73: Replacement
Scheme 73: Replacement

Scheme 74

Scheme 74
Scheme 74
  1. Turn ignition switch OFF.
  2. Disconnect the negative (-) battery cable.
  3. Disconnect the TCM connector (A).
  4. Remove the TCM (C) after removing the mounting bolts (A) and nut (B). TCM installation bolt/nut: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

Inspection

  1. Turn ignition switch OFF.
  2. Disconnect the oil temperature sensor connector.
  3. Measure resistance between sensor signal terminal and sensor ground terminal.
  4. Check that the resistance is within the specification.

Scheme 75

Scheme 75: Removal
Scheme 75: Removal

Scheme 76

Scheme 76
Scheme 76

Scheme 77

Scheme 77
Scheme 77

Scheme 78

Scheme 78
Scheme 78
  1. Remove the battery and the battery tray. Refer to «BATTERY»(ref-429541-S17247731372011101500000) .
  2. Remove the under cover (A). Tightening torque: 7.8 ~ 11.8 N.m (0.8 ~ 1.2 kgf.m, 5.8 ~ 8.7 lb-ft)
  3. Replace new gasket and the plug after draining the automatic transaxle fluid by removing the drain plug. Refer to «HYDRAULIC SYSTEM (FLUID)»(ref-429560-S16638232802011101500000) .
  4. Remove the valve body cover (B) and eyebolt (A). Tightening torque: 34.3 ~ 44.1 N.m (3.5 ~ 4.5 kgf.m, 25.3 ~ 32.6 lb-ft) 13.8 ~ 14.7 N.m (1.3 ~ 1.5 kgf.m, 9.4 ~ 10.8 lb-ft) CAUTION: Always replace the gasket of the eyebolt use new one whenever loosening eyebolt.
  5. Disconnect the oil temperature sensor connector (A).
  6. Remove the oil temperature sensor (A) after removing a bolt. Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
  1. Check signal waveform of Input & output speed sensor using the GDS. Specification: Refer to «SIGNAL WAVE FORM»(ref-429561-S24909169512011101500000) .

Scheme 79

Scheme 79: Removal
Scheme 79: Removal

Scheme 80

Scheme 80
Scheme 80

Scheme 81

Scheme 81
Scheme 81

Scheme 82

Scheme 82
Scheme 82

Scheme 83

Scheme 83
Scheme 83

Scheme 84

Scheme 84
Scheme 84
  1. Remove the battery and the battery tray. Refer to «BATTERY»(ref-429541-S17247731372011101500000) .
  2. Remove the under cover (A). Tightening torque: 7.8 ~ 11.8 N.m (0.8 ~ 1.2 kgf.m, 5.8 ~ 8.7 lb-ft)
  3. Replace new gasket and the plug after draining the automatic transaxle fluid by removing the drain plug. Refer to «HYDRAULIC SYSTEM (FLUID)»(ref-429560-S16638232802011101500000) .
  4. Remove the valve body cover (B) and eyebolt (A). Tightening torque: 34.3 ~ 44.1 N.m (3.5 ~ 4.5 kgf.m, 25.3 ~ 32.6 lb-ft) 13.8 ~ 14.7 N.m (1.3 ~ 1.5 kgf.m, 9.4 ~ 10.8 lb-ft) CAUTION: Always replace the gasket of the eyebolt use new one whenever loosening eyebolt. NOTE: Remove installation bolts in the engine compartment first and then remove others under the vehicle.
  5. Remove the plate and the detent spring (A) after removing the bolt. Tightening torque: 24.5 ~ 35.3 N.m (2.5 ~ 3.6 kgf.m, 18.1 ~ 26.0 lb-ft)
  6. Remove the bolt (3 ea) after disconnecting the solenoid valve connector (A) and the oil temperature sensor connector (B). Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft) CAUTION: Be careful not to damage the harness lock connector.
  7. Remove the valve body assembly (A). Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
  8. Disconnect the input & output speed sensor connector (A).
  9. Remove the input & output speed sensor (B) after removing the bolts (2 ea). Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
  1. Check signal waveform of Input & output speed sensor using the GDS. Specification: Refer to «SIGNAL WAVE FORM»(ref-429561-S35968638672011101500000) .

Scheme 85

Scheme 85: Removal
Scheme 85: Removal

Scheme 86

Scheme 86
Scheme 86

Scheme 87

Scheme 87
Scheme 87

Scheme 88

Scheme 88
Scheme 88

Scheme 89

Scheme 89
Scheme 89

Scheme 90

Scheme 90
Scheme 90
  1. Remove the battery and the battery tray. Refer to «BATTERY»(ref-429541-S17247731372011101500000) .
  2. Remove the under cover (A). Tightening torque: 7.8 ~ 11.8 N.m (0.8 ~ 1.2 kgf.m, 5.8 ~ 8.7 lb-ft)
  3. Replace new gasket and the plug after draining the automatic transaxle fluid by removing the drain plug. Refer to «HYDRAULIC SYSTEM (FLUID)»(ref-429560-S16638232802011101500000) .
  4. Remove the valve body cover (B) and eyebolt (A). Tightening torque: 34.3 ~ 44.1 N.m (3.5 ~ 4.5 kgf.m, 25.3 ~ 32.6 lb-ft) 13.8 ~ 14.7 N.m (1.3 ~ 1.5 kgf.m, 9.4 ~ 10.8 lb-ft) CAUTION: Always replace the gasket of the eyebolt use new one whenever loosening eyebolt. NOTE: Remove installation bolts in the engine compartment first and then remove others under the vehicle.
  5. Remove the plate and the detent spring (A) after removing the bolt. Tightening torque: 24.5 ~ 35.3 N.m (2.5 ~ 3.6 kgf.m, 18.1 ~ 26.0 lb-ft)
  6. Remove the bolt (3 ea) after disconnecting the solenoid valve connector (A) and the oil temperature sensor connector (B). Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft) CAUTION: Be careful not to damage the harness lock connector.
  7. Remove the valve body assembly (A). Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
  8. Disconnect the input & output speed sensor connector (A).
  9. Remove the input & output speed sensor (B) after removing the bolts (2 ea). Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
  1. Turn ignition switch OFF.
  2. Disconnect the oil temperature sensor connector.
  3. Measure resistance between sensor signal terminal and sensor ground terminal.
  4. Check that the resistance is within the specification.
  1. Turn ignition switch OFF.
  2. Disconnect the oil temperature sensor connector.
  3. Measure resistance between sensor signal terminal and sensor ground terminal.
  4. Check that the resistance is within the specification.
  1. Turn ignition switch OFF.
  2. Disconnect the oil temperature sensor connector.
  3. Measure resistance between sensor signal terminal and sensor ground terminal.
  4. Check that the resistance is within the specification.
  1. Turn ignition switch OFF.
  2. Disconnect the oil temperature sensor connector.
  3. Measure resistance between sensor signal terminal and sensor ground terminal.
  4. Check that the resistance is within the specification.
  1. Turn ignition switch OFF.
  2. Disconnect the oil temperature sensor connector.
  3. Measure resistance between sensor signal terminal and sensor ground terminal.
  4. Check that the resistance is within the specification.
  1. Turn ignition switch OFF.
  2. Disconnect the oil temperature sensor connector.
  3. Measure resistance between sensor signal terminal and sensor ground terminal.
  4. Check that the resistance is within the specification.
  1. Turn ignition switch OFF.
  2. Disconnect the oil temperature sensor connector.
  3. Measure resistance between sensor signal terminal and sensor ground terminal.
  4. Check that the resistance is within the specification.
  1. Turn ignition switch OFF.
  2. Disconnect the oil temperature sensor connector.
  3. Measure resistance between sensor signal terminal and sensor ground terminal.
  4. Check that the resistance is within the specification.

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