C15 – 0064-08 Secondary Engine Speed loss of signal (34)

Conditions Which Generate This Code:

The Engine Control Module (ECM) detects the following conditions:
• The signal from the secondary engine speed/timing sensor has been lost and the engine
speed did not pass through the range of 350 rpm to 500 rpm.
• The engine has been running for more than three seconds.
• The battery voltage is greater than 9 VDC for more than two seconds prior to the loss of the signal.

System Response:
The ECM will log the diagnostic code and the ECM will trigger a snapshot. The check engine lamp will illuminate once this diagnostic code has been active for more than ten hours. The ECM will ignore
the secondary engine speed/timing sensor.

Possible Performance Effect:
None

Note: If the signals from both engine speed/timing sensors are lost, then the engine will shut down.

Troubleshooting:
Perform the following diagnostic procedure: “Engine Speed/Timing Sensor Circuit – Test”

Results:
• OK – STOP.

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