MID 087 - Chassis ECM
CID 1175 - Body Position Sensor
FMI 08 - Abnormal Frequency, Pulse Width, or Period
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Body position sensor circuit | |
This diagnostic code indicates the Chassis ECM detects the body position sensor signal is abnormal. The signal may be abnormal in the following:
- Frequency
- Pulse width
- Period
The following can cause this code:
- Loose mechanical devices
- Intermittent ground
- Sensor failure
- Poor connections
- ECM failure
Note: The following test procedure may create other diagnostic codes. Ignore these created codes and clear these created codes after the original diagnostic code has been corrected. Ensure diagnostic code CID 1175 FMI 08 is active before performing this procedure.
Note: Use a calibrated digital multimeter for this procedure.
System Response:
- Indicates intermittent fault
- The code Is active or not active
- The body snub function does not operate properly when the body is lowered
- The machine gear is limited
- The gear is limited to the current setting for the gear limit function
- The hoist system operates properly after the diagnostic code has been corrected
Test Step 1. CHECK FOR LOOSE DEVICES
- Perform an inspection of all involved mechanical devices.
- Visually inspect for signs of loose devices.
- Attempt to wiggle the devices.
Expected Result:
All the devices are secure.
Results:
- OK - All the devices are secure. Proceed to Test Step 2.
- NOT OK - All the devices are not secure.
Repair: Secure the loose device.
STOP
Test Step 2. CHECK THE SENSOR
- Turn on the disconnect switch and the keyswitch.
- Disconnect the sensor from the harness while observing the diagnostic code status.
Expected Result:
CID 1175 FMI 08 remains active and the FMI does not change.
Results:
- OK - CID 1175 FMI 08 remains active and the FMI does not change. Proceed to Test Step 4.
- NOT OK - CID 1175 FMI 08 is not active or the FMI changes. The sensor has failed.
Repair: Replace the sensor.
STOP
Test Step 3. CHECK FOR GOOD GROUND
- Reconnect the sensor.
- Turn off the keyswitch and the disconnect switch.
- Remove the 7X-1710 Multimeter Probe from the voltage supply wire (contact A).
- At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along the ground wire contact B.
- Measure the resistance from contact B to frame ground.
Expected Result:
The resistance is less than 5 ohms.
Results:
- OK - The resistance is less than 5 ohms. Proceed to Test Step 4.
- NOT OK - The resistance is more than 5 ohms.
Repair: Repair or replace the harness.
STOP
Test Step 4. CHECK CONNECTIONS
The keyswitch and the disconnect switch remain off.
- Inspect the harness.
Clean the harness connector contacts.
Inspect the harness connector contacts for corrosion or damage.
Inspect the wire insulation for damage caused by heat, corrosion, or chafing.
- Perform a
45 N (10 lb) pull test on each circuit wire. - Reconnect all harness connectors.
Verify that the connectors are fully seated and the clips are fastened.
- Check for intermittent problems. Using Cat® Electronic Technician (Cat ET), perform a wiggle test on the harness.
- Turn on the disconnect switch and the keyswitch.
- Operate the machine.
- Check CID 1175 FMI 08 status.
Expected Result:
CID 1175 FMI 08 is not active.
Results:
- OK - CID 1175 FMI 08 is not active.
Repair: The initial diagnostic code was probably caused by a poor connection at one of the connectors that was checked.
Resume normal operation.
STOP
- NOT OK - CID 1175 FMI 08 is active intermittently. There is a poor harness connection.
Repair: Repair or replace the harness.
STOP
- NOT OK - CID 1175 FMI 08 is active continuously.
Repair: Exit this procedure and perform this procedure again. Contact your technical communicator. If the ECM requires replacement, see Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP