AT-PZEV Models

DTC P1890: Problem in Shift Control System
2003 AT-PZEV (SULEV) and 2004-2005 AT-PZEV Models

NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot.

1. Check for other DTCs or temporary DTC indicated simultaneous with DTC P1890.
Are there any other DTCs?
YES- Perform the troubleshooting for the indicated DTC. Recheck for DTC P1890 after troubleshooting.
NO- Go to step 2.
2. Warm up the engine until the engine coolant temperature reaches 176°F (80°C).
3. Check the IMA battery level gauge in the gauge assembly.
Does the battery level gauge indicate 4 - 19 segments?
YES- Go to step 4.
NO- Run the engine in the P position at 3,500 rpm until the battery level gauge shows 4 - 19 segments, then go to step 4.
4. Shift to the D position.
5. Keep pressing the brake pedal for 5 seconds.
6. Accelerate from a stop at over 40% throttle, and drive the vehicle on a flat road at about 37 mph (60 km/h) for more than 15 seconds. Do not release the accelerator during test-driving.
7. Slow down the vehicle and step the wheels, and after stopping keep pressing the brake pedal for 5 seconds.
8. Check whether the HDS indicates any DTCs.
Does the HDS indicate any DTCs?
YES- Perform the troubleshooting for the indicated DTC(s).
NO- Return to step 5, and repeat to test-drive. If the tester does not indicate DTC after the test-drive has been done four times, go to step 9.
9. Park the vehicle on level ground, set the parking brake, and block the front wheels securely.
10. Firmly press the brake pedal, and shift to the D position.
11. While pressing the brake pedal firmly, also press the accelerator for 6-8 seconds at full throttle.
12. Measure the stall speed rpm in the D position.
Does the engine speed exceed 3,500 rpm?
YES- Replace the transmission.
NO- Go to step 13.
13. Test-drive the vehicle on a flat road in the D position. Accelerate with 2 V of throttle position sensor voltage by monitoring the voltage with the HDS, and drive the vehicle above 37 mph (60 km/h) for several minutes.
14. Check the engine speed when vehicle speed is 37 mph (60 km/h).
Is the engine speed 2,350 - 2,950 rpm?
YES- Intermittent failure, the system is OK at this time. If necessary, replace the ATF, then recheck.
NO- Replace the transmission.