3126B and 3126E On-highway Engines Caterpillar

Use this procedure under the following situation:

Use this procedure if any of the following conditions exist:

• 22-13 Check Timing Sensor Calibration (42)

A timing calibration must be performed under the following conditions:

• The ECM requires replacement and the ECM will not communicate with Caterpillar Electronic Technician (Cat ET) in order to allow the timing calibration to be copied when the "Copy Configuration-ECM Replacement" feature is used.

• Work has been performed on the engine drive train (front).

Note: The timing calibration will not increase the available engine power or the timing calibration will not decrease the available engine power. Do not expect an increase in power due to the performance of the timing calibration.

Replacement ECM

If a replacement ECM is required, the ECM parameters and the timing calibration can be transferred from the suspect ECM to the replacement ECM. Timing calibration will NOT be necessary. This feature requires Cat ET and this feature is only possible if the existing ECM can communicate with Cat ET.

Test Step 1. Install the 7X-1171 Transducer Adapter

1. Turn the ignition keyswitch to the OFF position.

2. Remove the timing calibration plug from the left or right front face of the flywheel housing.

3. Install the 7X-1171 Transducer Adapter into the hole for the plug.

Results:

• OK - Proceed to Test Step 2.

Test Step 2. Install the 6V-2197 Magnetic Transducer

1. Put a 2D-6392 O-Ring Seal on the end of the transducer.

   Note: A small amount of clean engine oil will allow the seal to slide onto the transducer more easily.

2. Push the transducer through the adapter until the transducer contacts the outermost portion of the timing ring. Move the O-ring seal downward against the adapter.

3. Withdraw the transducer 1.0 mm (0.04 inch) and hand tighten the nut on the adapter sleeve in order to secure the transducer in place.

4. Check that the probe is properly installed and snug. The probe should not move when the engine is started.

5. Connect the 6V-2197 Magnetic Transducer to the 7X-1695 Cable .

6. Remove the access cover from the J400 engine timing calibration connector.

   Note: Some engines do not have a J400 engine timing calibration connector in the engine harness. A 170-3519 Harness is required. Refer to Special Instruction, REHS0399, "Installation Of The 170-3519 Timing Calibration Harness Assembly".

Results:

• OK - Proceed to Test Step 3.

Test Step 3. Start the Engine and Allow the Coolant to Reach Operating Temperature

1. Start the engine and run at low idle until the engine has warmed up enough to exit cold mode operation.

2. Check for active diagnostic codes. Use the procedures in this manual to troubleshoot and repair any active diagnostic codes before attempting a calibration check. The engine must not have any diagnostic fault conditions that are present during the timing calibration except the following condition:
   • 22-13 Check Timing Sensor Calibration (42)

3. After the engine has warmed up, set the engine speed to 1100 rpm by using the cruise control switches or by using the accelerator pedal.

   Note: The engine rpm must be steady within the 1000 to 1200 rpm range in order to perform a timing calibration.

Results:

• OK - Proceed to Test Step 4.

Test Step 4. Connect Cat ET

1. Connect Cat ET to the cab data link connector.

2. After the engine has exited cold mode operation, access the "Timing Calibration Screen" on Cat ET. Access the following display screens in order:
   • "Service"

   • "Calibrations"

   • "Timing Calibration"

   Note: To perform a timing calibration, the engine rpm must remain as steady as possible at approximately 1100 rpm. This can be performed by using the idle engine governor or a steady foot on the accelerator pedal. Any changes to engine rpm that are more than 100 rpm will slow down the procedure. These changes will also reduce the accuracy of the procedure.

3. Connect the 7X-1695 Cable for the 6V-2197 Magnetic Transducer to the J400 Speed/Timing Calibration Connector.

4. Ensure that all of the connections are made correctly.

Results:

• OK - Proceed to Test Step 5.

Test Step 5. Calibrate the Speed/Timing Sensor

1. To calibrate the timing to the correct setting, select "space" on Cat ET. Wait until Cat ET indicates that the timing is "CALIBRATED".

   Note: If the Cat ET display reads "CALIBRATION UNSUCCESSFUL", the electronic injection timing has not been set. Recheck the tool installation and tool operation and try again to calibrate electronic injection timing. If the crankshaft and camshaft gears have been reassembled incorrectly, the engine will not calibrate.

   If the timing calibration has been successfully completed, do not exit the timing calibration screen on Cat ET until you have disconnected the 7X-1695 Cable for the 6V-2197 Magnetic Transducer from the P400 Speed/Timing Calibration Connector.

Expected Result:

The timing calibration procedure was completed successfully.

Results:

• OK - The timing calibration procedure was completed successfully. Proceed to Test Step 6.

• Not OK -

  Repair: Perform the following procedure:

  1. Verify that the engine rpm was stable during the testing (± 50 rpm). If the engine rpm was unstable or the engine rpm could not be controlled within ± 50 rpm because of mechanical factors or electrical factors, refer to Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable".

  2. If all of the problems have been corrected but the timing can not be calibrated, check the cable of the 6V-2197 Magnetic Transducer and check the 6V-2197 Magnetic Transducer in order to verify that the Magnetic Transducer is not bent. If the 6V-2197 Magnetic Transducer is not bent, restart this procedure.

  STOP

Test Step 6. Disconnect the 6V-2197 Magnetic Transducer Before Exiting the "Monitor/Calibrate Timing" Screen on Cat ET

1. Disconnect the timing probe from the J400 engine timing calibration connector.

2. Install the cover for the J400 connector.

3. Exit the timing calibration screen on Cat ET.

   Note: Exiting the timing calibration screen on Cat ET will drop the engine rpm to the programmed low idle if the cruise control switches were used to maintain engine rpm during calibration. This is normal.

Expected Result:

The magnetic transducer was disconnected before exiting the timing calibration screen on Cat ET.

Results:

• OK - STOP

• Not OK - If the magnetic transducer is still installed after exiting the timing calibration screen on Cat ET, vehicle speed diagnostic codes may be generated.

  Repair: If vehicle speed diagnostic codes are generated, the vehicle speed diagnostic codes should be cleared.

  STOP