Pinpoint Test 4

PINPOINT TEST 4: INACCURATE SPEEDOMETER READING

Normal Operation
The instrument cluster receives the vehicle speed sensor (VSS) status from the powertrain control module (PCM) over the high speed controller area network (HS-CAN) bus lines. The PCM receives the VSS status from the output shaft speed (OSS) sensor. The instrument cluster upon receipt of the VSS data commands the speedometer to sweep to the correct position. The instrument cluster sets DTC U0100 in continuous memory if the VSS data is not received for more than 5 seconds and speedometer does not operate, indicating 0 MPH. If VSS data is missing or invalid for less than 5 seconds, the speedometer stops registering vehicle speed changes and freezes at the last position on the gauge.

This pinpoint test is intended to diagnose the following:
- Vehicle configuration
- PCM
- instrument cluster

Step 1-Step 4:

Step 5-Step 7: