The Engine Speed/Timing Sensor provides engine information to the Electronic Control Module (ECM). The sensor generates a pulse signal. A loss of the engine speed/timing signal causes the ECM to stop sending power to the fuel injectors.
The ECM provides the Engine Speed/Timing Sensor with 12.5 ± 1.0 VDC. A unique tooth on the timing reference gear generates a unique duty cycle. The signal provides the ECM with information on the engine position.
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| Illustration 1 | g00594171 |
Schematic | |
Test Step 1. Check for CID-FMI
- Connect the Electronic Technician at the Service Tool Connector.
- Remove the timing calibration plug from the flywheel housing.
- Examine the flywheel through the timing calibration hole. Ensure that the probe is not inserted into the timing pin hole. If necessary, turn the engine.
- Install the 6V-3093 Transducer Adapter into the hole for the timing calibration at the flywheel.
- Insert the 6V-2197 Magnetic Transducer through the 6V-3093 Transducer Adapter. Insert the transducer until contact is made with the surface of the flywheel. Move the transducer 0.9 mm (0.04 inch) away from the flywheel.
- Tighten the nut on the 6V-3093 Transducer Adapter .
| NOTICE |
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DO NOT INSTALL THE TIMING CALIBRATION PROBE OVER THE TIMING PIN HOLE AT THE FLYWHEEL OR DAMAGE WILL RESULT. |
- Connect the 7X-1695 cable from the engine timing calibration probe to the connector P26.
- Start the engine. Allow the engine to exit cold mode operation.
Expected Result:
Only CID-FMI 261-13 should be active.
Results:
- OK - Proceed to test step 2.
- Not OK -
Repair: Repair any active diagnostic codes.
Stop.
Test Step 2. Calibration
- Select "Service" from the main menu on the ET. Select "Calibrations" from the drop down menu. Select Timing Calibration.
- Press the "Continue" button on the ET. Wait until the ET indicates that the ECM has calculated the timing reference.
Note: Engine speed will be set to 800 rpm by the ECM during the calibration.
Note: If the Electronic Technician reads "CALIBRATION UNSUCCESSFUL" the electronic injection timing has not been set.
Expected Result:
The timing should calibrate.
Results:
- OK - The timing calibration was successful. Stop.
- Not OK - The timing did not calibrate.
Repair: Excessive backlash in the engine gear train will cause inconsistent timing. Refer to Systems Operation for identifying and repairing a gear train problem.
Stop.