DTC 17: VSS Circuit Malfunction
- Reset the ECM/PCM (see page 11-468).
- Test-drive with no load (in Park or neutral), accelerate to 4,000 rpm (min-1), then decelerate to 1,500 rpm (min-1) with throttle fully closed for at least 5 seconds.
Is the MIL on and does it indicated DTC 17?
YES |
- Go to step 3. |
NO |
- Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the VSS and at the ECM/PCM. |
- Turn the ignition switch OFF.
- Block the rear wheels and set the parking brake.
- Raise the front of the vehicle, and make sure it is securely supported.
- Turn the ignition switch ON (II).
- Block the right front wheel, and slowly rotate the left front wheel.
- Measure voltage between ECM/PCM connector terminals A18 and A24.
ECM/PCM CONNECTOR A (31P)
Wire side of female terminals
Does the voltage pulse between 0 V and 5 V (or battery voltage)?
YES |
- Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM. |
NO |
- Go to step 9. |
| |
- Turn the ignition switch OFF.
- Disconnect ECM/PCM connector A (31P).
- Turn the ignition switch ON (II).
- Block the right front wheel, and slowly rotate the left front wheel.
- Measure voltage between the ECM/PCM connector terminals A18 and A24.
ECM/PCM CONNECTOR A (31P)
Wire side of female terminals
Does the voltage pulse between 0 V and 5 V?
YES |
- Substitute a known-good ECM/PCM and recheck. If the symptom/indication goes away, replace the original ECM/PCM. |
NO |
- Check these items: |
- A short or an open in the wire between the ECM/PCM (A18) and the VSS.
- If the wire is OK, test the VSS (see page 22-94).
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