Code No.22: Input Shaft Speed Sensor System
OPERATION
The input shaft speed sensor detects the speed of the underdrive clutch retainer, and sends the information to the engine-A/T-ECU as a pulse signal.DIAGNOSIS CODE SET CONDITIONS
The diagnosis code No.22 will be set if the input shaft speed sensor does not send a pulse signal for one second or more while the 3rd gears are engaged and the vehicle speed is 40 km/h or more (the output shaft speed sensor speed is 1000 r/min or more).If the code No.22 is set four times, the transmission will be fixed in 3rd gear as a fail-safe measure. However, the transmission can be downshifted to 2nd gear by operating the selector lever.
PROBABLE CAUSES
- Malfunction of input shaft speed sensor
- Malfunction of underdrive clutch retainer
- Damaged harness wires and connectors
- Malfunction of the engine-A/T-ECU
DIAGNOSIS PROCEDURE
STEP 1. MUT-II/III data list
) <Except for Hong Kong spec.>.Item 01: Input shaft speed sensor (Refer to data list reference table
) <Vehicles for Hong Kong spec.>.Q: Is the check result normal?
YES:
Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent Malfunction ).NO: Go to Step 2
.STEP 4. Measure the voltage at engine-A/T-ECU connector C-136.
- Connect input shaft speed sensor connector B-23.
- Turn the ignition switch to the ON position.
- Measure the voltage between engine-A/T-ECU connector C-136 terminal No.88 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES:
Go to Step 7.NO: Go to Step 5
.STEP 6. MUT-II/III data list
) <Except for Hong Kong spec.>.Item 01: Input shaft speed sensor (Refer to data list reference table
) <Vehicles for Hong Kong spec.>.Q: Is the check result normal?
YES:
Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent Malfunction ).NO: Replace the engine-A/T-ECU.
STEP 9. Measure the voltage at input shaft speed sensor connector B-23.
- Disconnect the connector, and measure the voltage between terminal 3 and earth at the wiring harness side.
- Turn the ignition switch to the ON position.
OK: System voltage
Q: Is the check result normal?
YES:
Go to Step 12.NO: Go to Step 10
.STEP 12. Measure the voltage at input shaft speed sensor connector B-23.
- Disconnect the connector, and measure the voltage between terminal 2 and earth at the wiring harness side.
- Turn the ignition switch to the ON position.
OK: 4.5 -
4.9 V
Q: Is the check result normal?
YES:
Go to Step 18.NO: Go to Step 13
.STEP 13. Measure the voltage at engine-A/T-ECU connector C-136.
- Disconnect input shaft speed sensor connector B-23.
- Turn the ignition switch to the ON position.
- Measure the voltage between engine-A/T-ECU connector C-136 terminal No.64 and earth.
OK: 4.5 -
4.9 V
Q: Is the check result normal?
YES:
Go to Step 16.NO: Go to Step 14
.STEP 18. Measure the output wave pattern of the input shaft speed sensor at engine-A/T-ECU connector C-136 (using an oscilloscope).
- Shift the selector lever to the D range.
- Accelerate the vehicle to approximately 50 km/h (shift range; 3rd).
- Connect an oscilloscope, and measure the voltage between engine-A/T-ECU connector C-136 terminal No.64 and earth.
OK: A wave pattern such as the one shown on (Check Procedure Using an Oscilloscope) should be output, and the maximum value should be 4.8 V or more and the minimum value should be 0.8 V or less. There should be no noise in the output wave pattern.
(Check Procedure Using an Oscilloscope) should be output, and the maximum value should be 4.8 V or more and the minimum value should be 0.8 V or less. There should be no noise in the output wave pattern.Q: Is the check result normal?
YES:
Go to Step 6.NO: Go to Step 19
.