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DTC 23

CODE NO.23: OUTPUT SHAFT SPEED SENSOR SYSTEM












CIRCUIT OPERATION
- A coil built into the output shaft speed sensor generates 0 - 5 volts pulse signal at both ends of this coil when the output shaft rotates. The pulse signal frequency increases with a rise in output 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 by the signal input to terminal 104.
- The output shaft speed sensor generates the pulse signal as the teeth of the transfer drive gear pass the magnetic tip of the sensor.

DTC SET CONDITIONS
- If the output from the output shaft speed sensor is continuously 50 percent lower than the vehicle speed for one second or more while driving in 3rd or 4th gear at a speed of 30 km/h (19 mph) or more, there is an open circuit or short-circuit in the output shaft speed sensor, diagnostic trouble code number "23" is output. If diagnostic trouble code number "23" is output four times, the transaxle is locked into 3rd gear or 2nd gear as a fail-safe measure.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set:
- Malfunction of the output shaft speed sensor
- Malfunction of the transfer drive gear or driven gear
- Damaged harness, connector Malfunction of the PCM

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. Using Scan Tool MB991502, Check Data List Item 23: Output Shaft Speed Sensor.





1. Connect scan tool MB991502 to the data link connector.
2. Start the engine. Selector lever position is "3"
3. Set scan tool MB991502 to the data reading mode for item 23, Output shaft speed sensor.
4. When driving at constant speed of 50 km/h (31 mph), the display should be:
- 1,600 - 1,900 r/min <2.4L Engine>
- 1,300 - 1,600 r/min <3.0L Engine>
If the output shaft speed sensor is operating properly, this malfunction may be intermittent. Refer to Diagnostic Strategies; General Electrical Troubleshooting.
If the output shaft speed sensor is not operating properly, go to Step 2.

STEP 2. Check The Output Shaft Speed Sensor.
1. Disconnect harness connector B-37 and measure at the sensor side.





2. Measure the resistance between terminals 1 and 2.
Standard value: 270 - 330 Ohms

If at the standard value, go to Step 3.
If outside the standard value, replace the output shaft speed sensor.
Recheck for DTCs.

STEP 3. Check The Power Supply Circuit At The Output Shaft Speed Sensor.
1. Disconnect harness connector B-37 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.





3. Measure the voltage between terminal 3 and ground.
Voltage should be battery positive voltage.
If battery positive voltage, go to Step 4.
If not battery positive voltage, repair the wiring harness wires or the connector between the output shaft speed sensor and the ignition switch.

STEP 4. Check The Circuit At The Output Shaft Speed Sensor.
1. Disconnect harness connector B-37 and measure at the harness side.
2. Turn the ignition switch to the "ON" position.





3. Measure voltage between terminal 2 and ground.
- Voltage should be approximately 5 volts.

4. Turn the ignition switch to the "LOCK" (OFF) position.





5. Check for continuity between terminal 1 and ground.
- Should be less than 2 ohm.
If the checks above do not meet the specifications, repair the wiring harness wires or the connector between the output shaft speed sensor and the PCM.
If the checks above meet the specifications, go to Step 5.

STEP 5. Check Harness Connector B-37 At The Output Shaft Speed Sensor For Damage.





If the harness connector B-37 is damaged, repair or replace it. Refer to Diagnostic Strategies; General Electrical Troubleshooting. Recheck for DTCs.
If harness connector B-37 is in good condition, go to Step 6.

STEP 6. Check Harness Connectors C-40 And C-42 At The PCM For Damage.





If harness connectors C-40 and C-42 are damaged, repair or replace it.
Refer to Diagnostic Strategies; General Electrical Troubleshooting. Recheck for DTCs.
If harness connectors C-40 and C-42 are in good condition, go to Step 7.

STEP 7. Check The Harness Wires Between PCM Connectors C-40 And C-42 And Output Shaft Speed Sensor Connector B-37.








If any harness wires between PCM connectors C-40 and C-42 and output shaft speed sensor connector B-37 are damaged, repair them. Refer to Diagnostic Strategies; General Electrical Troubleshooting. Recheck for DTCs.
If the harness wires are in good condition, go to Step 8.

STEP 8. Using An Oscilloscope, Check The Output Shaft Speed Sensor.
Required Special Tool: MB991709: Test Harness





1. Disconnect input shaft speed sensor connector B-37, and connect special tool MB991709 in between.
2. Connect the clip (for terminal 2 of connector B-37) of special tool MB991709 to an oscilloscope probe.
3. Start the engine and run it 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)].
Selector lever position should be "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, check the malfunction.
If the malfunction is not eliminated, replace the PCM. On 2000 models, the immobilizer-ECU should be replaced together with it. Refer to Ignition Switch and Immobilizer System.
If the waveform does not show a normal pattern, go to Step 9.

STEP 9. Replace The Output Shaft Speed Sensor. Then Check The Malfunction.





Replace the output shaft speed sensor.Recheck for DTCs.
If a malfunction is eliminated, diagnosis is completed.
If the malfunction is not eliminated, go to Step 10.

STEP 10. Check The Transfer Drive Gear Or Driven Gear.





It the transfer drive gear or driven gear is not defective, go to Step 11.
If the transfer drive gear or driven gear is defective, replace the transfer drive gear or driven gear. Refer to Output Shaft under the overhaul procedures. Recheck for DTCs.

STEP 11. Recheck for DTCs.
If the malfunction is eliminated, diagnosis is complete.
If the malfunction is not eliminated, eliminate the source of the noise.
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