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Home >> Mitsubishi >> 1999 >> Galant ES V6-3.0L SOHC >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Transmission Control System >> DTC 41

DTC 41

CODE NO.41: 1ST GEAR INCORRECT RATIO
CODE NO.42: 2ND GEAR INCORRECT RATIO
CODE NO.43: 3RD GEAR INCORRECT RATIO
CODE NO.44: 4TH GEAR INCORRECT RATIO
CODE NO.46: REVERSE GEAR INCORRECT RATIO












CIRCUIT OPERATION
- A coil built into the input shaft speed sensor generates 0 - 5 volts pulse signal at both ends of this coil when the input shaft rotates. The pulse signal frequency increases with a rise in input shaft speed.
- Both ends of the coil are connected to the PCM (terminals 57 and 103) via the input shaft speed sensor connector (terminals 1 and 2).
- The PCM detects the input shaft speed with the signal input to terminal 103.
- A coil built into the output shaft speed sensor generates 0 - 5 volts pulse signal at both ends of this coil when the input shaft rotates. The pulse signal frequency increases with a rise in input shaft speed.
- Both ends of the coil are connected to the PCM (terminals 57 and 104) via the output shaft speed sensor connector (terminals 1 and 2).
- The PCM detects the output shaft speed with the signal input to terminal 104.

DTC SET CONDITIONS
- If the output shaft speed, which is multiplied by each gear ratio, does not correspond to respective input shaft speed, a diagnostic trouble code will be set. If the same diagnostic trouble code is set four times, the transaxle will be held in 3rd gear.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set:
- Malfunction of the input shaft speed sensor
- Malfunction of the output shaft speed sensor
- Malfunction of the PCM
- Malfunction of the underdrive clutch retainer
- Malfunction of the transfer drive gear or driven gear
- Malfunction of the low-reverse brake system (for code number "41," "46")
- Malfunction of the underdrive clutch system (for code number "41," "42," "43")
- Malfunction of the second brake system (for code number "42," "44")
- Malfunction of the overdrive clutch system (for code number "43," "44")
- Malfunction of the reverse clutch system (for code number "46")
- Noise generated

DIAGNOSIS
Required Special Tool: MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

STEP 1. Is A/T Diagnostic Trouble Code Numbers "22" Or "23" Output?





1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check whether A/T diagnostic trouble code number "22" or "23" resets.
If yes, refer to Code No. 22 - Input shaft speed sensor system, or refer to Code No. 23 - Output shaft speed sensor system.
If no, go to Step 2.

STEP 2. Using An Oscilloscope, Check The Input Shaft Speed Sensor Or Output Shaft Speed Sensor.
Required Special Tool: MB991709: Test harness








1. Disconnect input shaft speed sensor connector B-40 or output shaft speed sensor connector B-37, and connect the special tool (test harness: MB991709) in between.
2. Connect the clip (for terminal 2 of connector B-40 or B-37) of special tool MB991709 (connected to the input shaft speed sensor connector B-40 or the output shaft speed sensor connector B-37) to an oscilloscope probe.
3. Start the engine and run at:
- 1,600 - 1,900 r/min <2.4L Engine>
- 1,300 - 1,600 r/min <3.0L Engine>
[Approximately 50 km/h (31 mph)].
Move the selector lever to "3"





4. Check the waveform.
- The waveform should show a normal pattern as shown in the illustration and at least 4.5 volts.
5. Turn off the engine.
If the waveform shows a normal pattern, go to Step 3.
If the waveform does not show a normal pattern, go to Step 4.

STEP 3. Replace The PCM.





Replace the PCM. On 2000 models, the immobilizer-ECU should be replaced together with it. Refer to Ignition Switch and Immobilizer System. Recheck for DTCs.
If the malfunction is eliminated, diagnosis is complete.
If the malfunction is not eliminated, observe the table above to check the clutches and brakes. Repair or replace if necessary. Recheck for DTCs.

STEP 4. Replace The Input Shaft Speed Sensor Or The Output Shaft Speed Sensor. Then Check The Malfunction





Replace the input shaft speed sensor or the output shaft speed sensor.
Refer to Transaxle. Recheck for DTCs.
If the malfunction is eliminated, diagnosis is completed.
If the malfunction is not eliminated, go to Step 5.

STEP 5. Replace The Underdrive Clutch Retainer, Transfer Drive Gear Or Driven Gear.





Replace the underdrive clutch retainer, transfer drive gear or driven gear. Refer to Underdrive Clutch and Input Shaft, Output Shaft under the transmission overhaul procedures.
If the malfunction is eliminated, diagnosis is complete.
If the malfunction is not eliminated, eliminate the source of the noise.
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