DTC 22
DTC 22: Vehicle Speed SignalNOTE:
^ If the MIL indicator stays on, troubleshoot the PGM-FI system first.
^ The vehicle speed decreases abruptly from 12 mph (20 km/h) or more (by applying brake), and it is less than 1 mph (1 km/h) and engine speed is 2,000 rpm or above for 5 seconds (continuously) after the abrupt deceleration.
^ While turning the steering wheel with the vehicle speed of 1 mph (1 km/h) or less for 20 seconds, and the engine speed is 2,000 rpm or above for at least 10 seconds.
^ When the engine speed is 500 rpm or less, and the vehicle is traveling at a speed of 6 mph (10 km/h) or more for about 3 seconds.
1. Start the engine and check the tachometer.
Is the tachometer working correctly?
YES- Go to step 2.
NO- Perform the gauge self-diagnostic function. If the tachometer is OK, go to step 2.
2. Turn the ignition switch OFF, and restart the engine.
3. Test-drive the vehicle, and watch the EPS indicator.
Does the EPS indicator come on?
YES- Go to step 4.
NO- The system is OK at this time.
4. Turn the ignition switch OFF, then disconnect the EPS control unit connector C (13P) and PCM connector A (31P).
5. Check for continuity between EPS control unit connector C (13P) terminal No. 10 and body ground.
Is there continuity?
YES- Repair short to ground in the wire between PCM and EPS control unit.
NO- Go to step 6.
6. Connect the PCM connector A (31P).
7. Block the rear wheels and raise the front of the vehicle, and support it with safety stands in the proper locations.
8. Turn the ignition switch ON (II).
9. Block the right front wheel, and slowly rotate the left front wheel and measure the voltage between EPS control unit connector C (13P) terminal No. 10 and body ground.
Does the voltage pulse 0 - 12 V?
YES- Go to step 10.
NO- Repair open in the wire between the EPS control unit and the PCM.
10. Turn the ignition switch OFF.
11. Start the engine, and let it idle.
12. Measure the voltage between the EPS control unit connector C (13P) terminal No. 9 and body ground.
Is there voltage pulses 3 V or less - 6 V or more?
YES- Check for loose terminals and poor connections at the EPS control unit. If necessary, substitute a known-good EPS control unit and recheck.
NO- Check for loose terminals or poor connections at the PCM. If necessary, substitute a known-good PCM and recheck.