DTC P1890: Problem in CVT Speed Control System
- Turn the ignition switch to ON (II).
- Check for Pending or Confirmed DTCs with the HDS.
Are any other Pending or Confirmed DTCs indicated along with DTC P1890?
YES -Go to the indicated DTC'S TROUBLESHOOTING , and recheck.
NO -Go to step 3.
- Clear the DTC with the HDS.
- Start the engine, and warm it up to normal operating temperature (the radiator fan comes on twice).
- Check the SOC in the Data List with the HDS.
Does the SOC indicate more than 50%?
YES -Go to step 6.
NO -Start the engine with the shift lever in P or N, hold it at 3, 500 rpm until the SOC indicates at least 50%, then go to step 6.
- Test-drive the vehicle at speeds about 37 mph (60 km/h) for at least 1 minute.
- Check for Pending or Confirmed DTCs with the HDS.
Are any DTCs indicated?
YES -Go to the indicated DTC'S TROUBLESHOOTING .
NO -Go to step 6, and repeat the test-drive. If the HDS does not indicate a DTC after the test-drive has been done four times, go to step 8.
- Park the vehicle on level ground, apply the parking brake, and block all four wheels securely.
- Start the engine.
- Firmly press the brake pedal, and shift the shift lever to D.
- While pressing the brake pedal firmly, also press the accelerator for 6-8 seconds at full throttle, and measure the stall speed rpm.
Does the stall speed exceed 3, 500 rpm?
YES -Replace the transmission.
NO -Go to step 12.
- Prepare the HDS to take a HIGH SPEED SNAPSHOT (refer to the HDS user's guide for more details if needed):
- Select the High Speed icon.
- Select these parameters:
- Vehicle Speed
- Engine Speed
- APP Sensor A (V)
- Set the Trigger Type to Parameter.
- Adjust the Parameter setting for APP Sensor A (V) to 2.3 V.
- Set the recording time to 60 seconds.
- Set the Trigger point to -30 seconds.
- Find a suitable level road. When you are ready to do the test, press OK with the HDS.
- Shift the shift lever to D.
- Monitor the HDS, and accelerate quickly until APP Sensor A reads 2.3 V. Maintain a steady throttle at 2.3 V until the vehicle reaches 37 mph (60 km/h), then slow the vehicle, and come to a stop.
- Save the snapshot if the entire event was not recorded increase the recording time setting as necessary and repeat step 12.
- Review the snapshot and compare APP Sensor A, Vehicle Speed, and Engine Speed.
Is the engine speed 2, 150-2, 750 rpm at 37 mph (60 km/h) with APP Sensor A at 2.3 V?
YES -Intermittent failure, the system is OK at this time. If necessary, replace the CVTF (see CVT FLUID REPLACEMENT ), and recheck.
NO -Replace the transmission.