K2–194
TROUBLESHOOTING
NO.11 SHIFT POINT IS HIGH OR LOW
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NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION
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Diagnostic procedure
11 Shift point is high or low
DESCRIPTION
• Shift point considerably different from automatic shift diagram.
• Shift delays when accelerating.
• Shift occurs quickly when accelerating and engine speed does not increase.
POSSIBLE
CAUSE
• If the transaxle does not shift abnormally, there is a malfunction of input signal to TP sensor, input/
turbine speed sensor, or VSS.
• If engine speed is high or low regardless that shifting is normal, inspect tachometer.
• Verify that output signal of TP sensor changes linearly.
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
12 Torque converter clutch (TCC) non-operation
DESCRIPTION • TCC does not operate when vehicle reaches TCC operation range.
POSSIBLE
CAUSE
• Basically, TCC does not operate when fail-safe is operating. Verify DTC at first. If TCC operates when
driving at high speeds only, the malfunction (improper adjustment) is in D and/or M ranges switch circuit
or TR switch circuit.
Note
• If the TCC or piston is stuck, inspect them. In addition, inspect the oil cooler for foreign particles
which may have mixed in with the ATF.
• TCC piston slipped, burned
— Line pressure low
• Incorrect throttle position signal
• Input/turbine speed sensor malfunction
• TFT sensor malfunction
• Sensor ground malfunction
• VSS malfunction
• Malfunction of output solenoid valve system (Sticking)
• TCC solenoid valve malfunction
• Malfunction of control valve body system (Poor operation, sticking)
• TCC piston hydraulic pressure system malfunction
• Malfunction of TP sensor (Not operating linearly)
• Malfunction of input/turbine speed sensor or VSS
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
STEP INSPECTION ACTION
1 • Turn ignition switch to ON.
• Does gear position lamp indication
correspond to selector lever position?
Yes Go to next step.
No Go to symptom troubleshooting No.27 “Gear position
indicator light does not illuminate in M range”, or No.28
“Gear position indicator light illuminates in D range or P, N,
R positions”.
2 • Disconnect TCM.
• Is resistance between ground terminals 1C,
1Y at TCM connector and body ground less
than 5.0 ohm?
Yes Go to next step.
No Repair open ground circuit.
3 • Remove torque converter.
• Inspect torque converter.
(See ATX Workshop Manual.)
• Is torque converter okay?
Yes • Overhaul control valve body and repair or replace any
defective parts.
(See ATX Workshop Manual.)
• If problem remains, replace or overhaul transaxle and
repair or replace any defective parts.
(See ATX Workshop Manual.)
No • Replace torque converter.
4 • Verify test results.
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, inspect related Service Informations and perform repair or diagnosis.
— If vehicle repaired, troubleshooting completed.
— If vehicle not repaired or additional diagnostic information not available, replace TCM.
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