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MONITOR DESCRIPTION
The park/neutral position switch detects the shift lever position and sends a signal to the ECM.
For security, the park/neutral position switch detects the shift lever position so that engine can be started only when the vehicle is in P or N shift position.
When the park/neutral position switch sends more than one signal at a time from switch positions P, R, N or D, the ECM interprets this as a fault in the switch. The ECM will turn on the MIL and store the DTC.
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The automatic transmission fluid (ATF) temperature sensor converts ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 79 ohm* 1 or more than 156 kohm* 2 , the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will turn on the MIL and store the DTC.
*1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.
*2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.
HINT
The ATF temperature can be checked on the OBD II scan tool or hand-held tester display.
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The ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects an open or short in the ATF temperature circuit or a fault of the ATF temperature sensor.
After running the vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below -4°C (25°F) after running the vehicle for a certain period, the ECM interprets this as a fault, and turns on the MIL.
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The input speed sensor detects the transmission input shaft speed. The ECM determines the gear shift timing based on a comparison of the input speed sensor (input shaft speed) with the output speed sensor (output shaft speed).
When the output shaft speed is higher than the expected value and the input shaft speed is 300 RPM or less while running with the shift in the D position, the ECM will conclude that there is malfunction of the input turbine speed sensor (NCO). The ECM will illuminate the MIL and a DTC is set.
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When the stop light switch remains ON during "stop and go" driving, the ECM interprets this as a fault in the stop light switch and the MIL comes on and the ECM stores the DTC. The vehicle must stop and go (3 km/h (2 mph) to 30 km/h (19 mph)) 5 times for two driving cycles in order to detect malfunction.
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SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor and input / turbine speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear). The ECM then compares the actual gear with the shift schedule in the ECM memory to detect mechanical trouble of the shift solenoid valves, valve body and automatic transmission (clutch, brake or gear etc.).
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The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL.
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- Check shift solenoid valve No. 1, No. 2 or No. 3 operation. PREPARATION: Remove the oil pan. Remove the shift solenoid valve No. 1, No. 2 or No. 3. CHECK: Shift solenoid valve No. 2: Applying 490 kPa (5 kgf/cm2, 71 psi) of compressed air, check that the solenoid valves do not leak air. When battery voltage is supplied to the shift solenoid valves, check that the solenoid valves are open. Shift solenoid valve No. 1 and No. 3: Connect the positive (+) lead with 8 to 10 W bulb to terminal 2 and the negative (-) lead to terminal 1, then check the movement of the valve. OK: NG: Replace the shift solenoid valve No. 1, No. 2 or No. 3 (See «VALVE BODY ASSEMBLY»(ref-229378-S34597446852006041500000) ). OK: Go To Next Step.
- Check valve body (See «PROBLEM SYMPTOMS TABLE»(ref-229177-S10193164582006042000000) ). NG: Repair or replace the valve body (See «VALVE BODY ASSEMBLY»(ref-229378-S34597446852006041500000) ). OK: Replace the transmission (See «AUTOMATIC TRANSMISSION UNIT (3UZ-FE)»(ref-229378-S02734652202007041900000) ).
The ECM commands gear shift by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good condition "ON/OFF" (In case of an open or short circuit, the ECM stops sending current to the circuit.).
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- Check transmission wire. PREPARATION: Disconnect the transmission wire connector. CHECK: Measure resistance between S1, S2 or S 3 of transmission wire and body ground. OK: Resistance: 11 to 15 ohm at 20°C (68°F) NG: Go to step 3 . OK: Go To Next Step.
- Measure resistance between terminal S1, S2 or S3 of ECM and body ground. PREPARATION: Connect the transmission wire connector. Remove the ECM hood. Disconnect the connector from ECM. CHECK: Measure resistance between terminal S1, S2 or S 3 and E1 of ECM. OK: Resistance: 11 to 15 ohm at 20°C (68°F) OK: Check and replace the ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace the harness or connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ).
- Check shift solenoid valve No. 1, No. 2 or No. 3. PREPARATION: Remove the oil pan. Remove the shift solenoid valve No. 1, No. 2 or No. 3. CHECK: Measure resistance between solenoid connector and body ground. Connect positive (c) lead to terminal of solenoid connector, negative (c) lead to solenoid body. OK: (a) Resistance: 11 to 15 ohm at 20°C (68°F) (b) The solenoid makes an operating noise. NG: Replace the shift solenoid valve (See «VALVE BODY ASSEMBLY»(ref-229378-S34597446852006041500000) ). OK: Repair or replace the transmission wire (See «ATF TEMPERATURE SENSOR»(ref-229378-S00204127702006041500000) ).
The ECM commands gear shift by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the DTC. And the ECM performs the fail-safe function and turns the other shift solenoid valves in good condition "ON/OFF" (In case of an open or short circuit, the ECM stops sending current to the circuit.) (see DTC P0973 SHIFT SOLENOID "A" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S1) : DTC P0974 SHIFT SOLENOID "A" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S1) : DTC P0976 SHIFT SOLENOID "B" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S2) : DTC P0977 SHIFT SOLENOID "B" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S2) : DTC P0979 SHIFT SOLENOID "C" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S3) : DTC P0980 SHIFT SOLENOID "C" CONTROL CIRCUIT HIGH (SHIFT SOLENOID VALVE S3) ).
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When an open or short in the linear solenoid valve (SLT) circuit is detected, the ECM interprets this as a fault. The ECM will turn on the MIL and store the DTC.
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The shift solenoid valve SLN controls the oil pressure to the accumulator control valve to reduce transmission gearshift shock.
The ECM judges the appropriate oil pressure based on the signals from the throttle position sensor, the output speed sensor and the input speed sensor, and adjusts the oil pressure by sending a duty-ratio signal to the shift solenoid valve SLN.
The ECM illuminates the MIL and store the DTC when it detects an open or a short circuit malfunction in the shift solenoid valve SLN.
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The ECM uses the signals from the Throttle Position Sensor and Air-flow Meter to monitor the engagement condition of the lock-up clutch.
Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect mechanical trouble of the shift solenoid valve SLU, valve body, torque converter clutch and automatic transmission assembly (clutch, brake or gear etc.).
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The ECM controls the oil pressure to the lock-up clutch based on engine-load information from the throttle position sensor, crankshaft position sensor, input speed sensor, and the oil pressure sensor for shift-solenoid SLU. The ECM commands the shift-solenoid SLU using a duty-cycle control signal. In turn, the shift solenoid operates the lock-up control valve and causes lock-up or flexible lock-up of the torque converter clutch.
To monitor the condition of the lock up clutch, the ECM monitors the signals from the input speed sensor, crank position sensor, the throttle position sensor, and air flow meter. The ECM uses this information to determine when the vehicle's torque converter clutch should be locked-up. The ECM can detect many mechanical problems in the shift solenoids, valve body, and the transmission clutches, brakes, and gears. If the ECM detects that the torque converter clutch is locked below the minimum lock-up speed, it will illuminate the MIL and store the DTC.
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The ECM controls the oil pressure to the lock-up clutch based on engine-load information from the throttle position sensor, crankshaft position sensor, input speed sensor, and the oil pressure sensor for shift-solenoid SLU. The ECM commands the shift-solenoid SLU using a duty-cycle control signal. In turn, the shift solenoid operates the lock-up control valve and cause lock-up or flexible lock-up of the torque converter clutch. The ECM illuminates the MIL and stores the DTC when ECM detects an open or a short circuit malfunction in the shift solenoid valve SLU.
