DTC Troubleshooting: 22, 23 (EPS)

DTC Troubleshooting: 22, 23

DTC 22:	Vehicle Speed Signal

NOTE:

If the MIL indicator is 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.
When the wheel of the vehicle being steered, the vehicle speed is 1 mph (1 km/h) or stopped for 20 seconds when the engine speed is 2,000 rpm or above. And, the accumulated time period in which this status is detected is for at least 10 seconds.
When the engine speed is 500 rpm or less, and the vehicle is travelling 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 correctry? YES - Go to 2. NO - Perform the tachometer troubleshooting. If the tachometer is OK, go to 2.

2.	Turn the ignition switch OFF, and restert the engine.

3.	Test-drive the vehicle, and watch the EPS indicator. Do is the EPS indicator come on? YES - Go to 4. NO - The system is OK at this time.n

4.	Turn the ignition switch OFF, and disconnect the EPS control unit connector C (13P) and ECM/PCM connector E (31P)

5.	Check for continuity between EPS control unit connector C (13P) terminal No. 10 and body groung. Is there continuity? YES - Repair short to body ground in the wire between ECP/PCM and EPS control unit.n NO - Go to 6.

6.	Connect the ECM/PCM connector E (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 0V and 12V? YES - Go to 10. NO - Repair open in the wire between the EPS control unit and ECM/PCM.n

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 about 12 V at idle?

YES - Check for loose wires or poor connections at the EPS control unit connectors. If necessary, substitute a known-good EPS control unit and recheck.n

NO - Repair open in the wire between the EPS control unit and ECM/PCM. If the wire is OK, check for a loose ECM/PCM connector. If necessary, substitute a known-good EPS control unit and recheck.n