Speedometer Head: Testing and Inspection
SPEEDOMETER INSPECTIONUsing NGS Hand-held scan tool
1. Remove the instrument cluster.
2. Connect the output terminal of the SST (NGS set) to the 2D terminal of the instrument cluster connector.
3. Connect the instrument cluster connector.
4. Turn the ignition switch to ON.
5. Connect the red lead of the SST (NGS set) to positive terminal of the battery and ground the black lead to the vehicle body.
6. Select "DIGITAL MEASUREMENT SYSTEM".
7. Select "SIGNAL SIMULATION".
8. Set the values shown below for the corresponding item.
LOW LEVEL: 0 V
HIGH LEVEL: 6 V
DUTY CYCLE: 50%
COUPLING: AC
9. Set "FREQUENCY" as indicated below.
10. Push "START'.
11. Verify that the speedometer indication is within the allowable range shown in the speedometer indication list.
12. If not as specified, replace the speedometer.
Using speedometer tester (DYNO)
1. Move the vehicle onto a speedometer tester.
2. Raise the vehicle speed and verity that the speedometer needle corresponds to the tester needle.
3. If the speedometer does not operate or the indication error is excessive, check the vehicle speedometer sensor and wiring harness.
4. If the vehicle speedometer sensor and wiring harness are normal, replace the speedometer.