Caterpillar 3100 HEUI ECM 22-13 Timing Sensor Calibration Guide

Use this procedure if diagnostic Code 22-13 check timing Sensor Calibration (42) is Active. This code occurs only with a new ECM before the ECM has has had timing calibration performed. It is important to perform the calibration before permanently installing the ECM to allow access and installation of the Timing Probe into the timing calibration port In the flywheel.



The Electronic Control Module (ECM) requires the timing calibration to determine the relative location of the timing wheel to the actual cam top center location.This is necessary for the engine to operate correctly for emissions.



A timing calibration is ONLY REQUIRED following an ECM replacement, not after replacing the Speed/Timing Sensors. Also, performing a timing calibration to improve performance is unnecessary and will not improve performance unless a 22-13 diagnostic code is the reason for the calibration.

Caterpillar 3100 HEUI ECM 22-13 Timing Sensor Calibration Guide


AUG96 and Later Personality Modules

It an ECM replacement is required and both the suspect ECM and replacement ECM have AUG96 or later Personality Module Release Dates, the ECM parameters and timing calibration can be transferred from the suspect ECM to the replacement ECM.


Timing calibration will NOT be necessary. This feature requires Caterpillar Electronic Technician(ET) and is only possible if the existing ECM can communicate with Caterpillar Electronic Technician(ET).


PID-FMI and Description of Code:

22-13 check timing sensor calibration(42)

The ECM has been replaced and the Engine speed/timing sensors have not been calibrated.


System response:

Electronic system response-The ECM will use default timing.

Engine Response-The engine will not be operating with calibrated timing



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Step 1: Install the Timing Adapter Group

Turn the ignition key OFF, engine OFF.

Remove the timing calibration plug from in front of the flywheel housing on the left side of the engine in back of and near the bottom of the ECM.

NOTE: the ECM may have to unbolted from the engine to access the timing calibration port.

Install he Timing Probe Adapter Sleeve into the hole for the plug.

Step 2: Install 6V2197 Timing Probe on Engine.

Put a 2D6392 O-Ring Seal on the end of the Magnetic Pickup Sensor (a small amount of clean engine oil will allow the seal slide onto the sensor more easily).

Push the sensor through the adapter until lit comes in contact with the outermost portion of the flywheel timing calibration.

ring and move the O-Ring seal down against the adapter.

Withdraw the sensor 0.04 in.(1.0 mm) and hand tighten the nut on the adapter sleeve to secure the magnetic pickup in place.

Disconnect Vehicle Speed/TC Calibration Connector J24/P24.

Connect the 6V2197 Timing Probe to the 7X1695 Deutsch DT Timing Harness Adapter.

Do not connect the DT Timing Harness Adapter to the Vehicle Speed/TC Probe Connector P24 until you are ready to perform the timing calibration. Connect cable for magnetic pickup to the magnetic pickup sensor.

NOTE: If the Timing Probe is connected to the Vehicle Speed/TC Connector when the Electronic Service Tool is not in the “Monitor/Calibrate Timing”Screen, Vehicle Speed Diagnostic Codes will result.


Step 3: Start Engine and Warm to Operating Temperature

Start the engine and run at low idle until the engine has warmed up enough to exit cold mode operation. An Electronic Service Tool status screen will display “COLD MODE”in the upper comer when Cold Mode operation exists. The engine will change idle from Cold Mode idle

(1000 rpm) to the programmed low idle rpm when out of Cold Mode.

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 present during timing calibration [ other than 22-13 Timing Sensor Calibration(42)].

Following warm up, set Engine Speed to 1100 rpm using the cruise switches(or use the throttle, if you have a steady toot).


NOTE: The Engine speed must be steady within the 1000 to 1200 rpm range to perfom a timing calibration.


Step 4: Connect CAT Electronic Service Tool

Connect an Electronic Service Tool to the Cab Data Link Connector.

After the engine has exited Cold Mode, select the

“Monitor/Calibrate Timing”Screen on the Electronic Service Tool.


NOTE: To perform a timing calibration, the engine rpm must be held as steady as possible at approximately 1100 rpm.

This can be performed using the cruise switches, Fast idle switch, or a steady foot on the accelerator pedal. Any major changes(greater than 100 rpm) will slow down the procedure and reduce accuracy.

Connect the 7X1695 Deutsch DT Adapter Harness for the

6V2197 Timing Probe to the 2-Pin Vehicle Speed/TC Connector P24.

Be certain all connections(probe, Electronic Service Tool)

are made correctly.

NOTE: If the Electronic Service Tool is not in the

“Monitor/Calibrate Timing”screen with the probe connected, vehicle speed diagnostic codes will be generated and you may be unable to set a constant engine speed using the cruise switches.


Step 5: Calibrate the Speed/Timing Sensors

To calibrate the timing to the correct setting, press the “space”key on the Electronic Service Tool keyboard and wait until the Electronic Service Tool indicates the timing is CALIBRATED.(First press of space bar will put “Timing Error”Bar on screen, second press Calibrates.)

NOTE: If the Electronic Service Tool display reads “COULD NOT CALIBRATE”timing, 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 crank and cam gears have been reassembled incorrectly (relative to each other), the engine will not calibrate.


If timing calibration has been successfully completed, do not exit the “Monitor/Calibrate Timing”Screen on the Electronic Service Tool until you have first disconnected the timing probe from the Vehicle Speed/TC Connector P24.


The Timing Calibration procedure was completed successfully. Proceed to the next step.

If engine speed is unstable, verify that the engine speeds were kept stable(?0 rpm) during testing. If engine speed was unstable or could not be controlled within 0 rpm because of mechanical or electrical factors, refer to”PA-20: Engine Misfires, Runs Rough Or Is Unstable”on page 55.

It all of the checks are OK but the timing still will not calibrate, check the Timing Probe and make sure it is not bent. If t Is not bent restart this procedure.



Step 6: Disconnect Timing Probe and Then Exit

“Monitor/Calibrate Timing”Screen.

Disconnect the Timing Probe from the Vehicle Speed/TC Connector P24.

Exit the Electronic Service Tool “Monitor/Calibrate Timing”

Screen(press previous screen key).



Exiting Electronic Service Tool “Monitor/Calibrate Timing”Screen will drop engine rpm to programmed low idle if PTO was used to maintain engine speed during calibration-

this is normal.

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