System Operation Description:
Use this procedure under the following situation:
Use this procedure if any of the following conditions exist:
• The ECM has been replaced and the old ECM will not communicate with the electronic service tool.
• 22-13 Engine Speed Signal Calibration Not Performed
• Work has been done to the engine drive train (front).
The primary engine speed/timing sensor provides an engine speed signal (rpm) to the ECM. The signal is created as the crankshaft gear rotates past the pickup of the primary engine speed/timing sensor. The secondary engine speed/timing sensor provides the timing signal to the ECM. The signal is created as the camshaft gear rotates past the pickup of the secondary engine speed/timing sensor. A unique pattern on the gear allows the ECM to determine the crankshaft position. This unique pattern on the gear allows the ECM to determine the top center position of the piston in the No. 1 cylinder. If the signal is lost from one of the sensors, a diagnostic code is generated. If the signal is lost from one of the sensors, the ECM will use a special type of logic that will allow the engine to start on only one sensor and this special type of logic will allow the engine to run on only one sensor.
Timing calibration is accomplished by installing a special magnetic transducer into the side of the engine block. The magnetic transducer senses a special slot on the crankshaft counterweight. A harness must be connected to the ECM in order to perform the timing calibration. The magnetic transducer is connected to the ECM through the harness.
When the engine speed is 1100 ± 50 rpm, the ECM is placed in timing calibration mode with the electronic service tool.
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.
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 the electronic service tool and this feature is only possible if the existing ECM can communicate with the electronic service tool.
Test Step 1. Install the 7X-1171 Transducer Adapter
A. Turn the key switch to the OFF position.
B. Use the 9S-9082 Engine Turning Tool to put either the No. 1 piston or the No. 6 piston at top center.
Note: Normal engine rotation is counterclockwise as the engine is viewed from the flywheel end. Refer to Illustration 201 and 202.
C. Use the following procedure for C11 and C13 engines.
a. Rotate the engine in the direction of the normal engine rotation by the following amount:
• 75 Degrees
b. Remove the timing calibration plug from the engine. If the engine is viewed from the flywheel, the timing calibration plug is located on the left side in the No. 4 cylinder rod pocket.
D. Use the following procedure for C15 engines.
a. Rotate the engine in the opposite direction of the normal engine rotation by the following amount:
• 60 Degrees
b. Remove the timing calibration plug from the engine. If the engine is viewed from the flywheel, the timing calibration plug is located on the left side in the No. 2 cylinder rod pocket.
E. Install the 7X-1171 Transducer Adapter into the hole for the plug.
• OK – Proceed to Test Step 2.
Test Step 2. Install the 6V-2197 Magnetic Transducer on the Engine
A. Put a 2D-6392 O-Ring Seal on the end of the magnetic transducer.
Note: A small amount of clean engine oil will allow the seal to slide onto the transducer more easily.
B. Push the magnetic transducer through the adapter until the magnetic transducer comes in contact with the outermost portion of the crankshaft counterweight. Move the O-ring seal downward against the adapter.
C. Withdraw the magnetic transducer 1.0 mm (0.04 inch) and hand tighten the nut on the adapter sleeve in order to secure the magnetic transducer in place.
D. Connect the 6V-2197 Magnetic Transducer to the 7X-1695 Cable.
E. Install the 170-3519 Harness (Timing
Calibration). Connect the white wire to the ECM at J2/P2:22 (Engine Timing Calibration Probe +).
Connect the yellow wire to the ECM at J2/P2:23 (Engine Timing Calibration Probe -).
F. Connect the 7X-1695 Cable to the 170-3519 Harness (Timing Calibration).
• OK – Proceed to Test Step 3.
Test Step 3. Start the Engine and Allow the Coolant to Reach Operating Temperature
A. Start the engine and run the engine at low idle until the engine has warmed up enough to exit cold mode operation. The status screen on the electronic service tool will display “COLD MODE” in the upper corner when cold mode operation exists. The engine will adjust idle rpm from cold mode idle to the programmed low idle rpm when cold mode operation is complete.
B. 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 Engine Speed Signal Calibration Not Performed
C. Once the engine is warm, set the engine speed to 1100 rpm with the cruise control switches or with the accelerator pedal.
Note: The engine rpm must be steady within the 1050 to 1150 rpm range in order to perform a timing calibration.
• OK – Proceed to Test Step 4.
Test Step 4. Connect the Electronic Service Tool
A. Connect the electronic service tool to the data link connector.
B. After the engine has exited cold mode operation, access the “Timing Calibration Screen” on the electronic service tool. Access the following display screens in order:
• “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 with 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.
C. Ensure that all of the connections are made correctly.
• OK – Proceed to Test Step 5.
Test Step 5. Calibrate the Speed/Timing Sensor
A. To calibrate the timing to the correct setting, select “Continue” on the electronic service tool. Wait until the electronic service tool indicates that the timing is “CALIBRATED”.
Note: If the electronic service tool 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 the electronic service tool until you have disconnected the 7X-1695 Cable for the 6V-2197 Magnetic Transducer from the ECM.
The Timing Calibration Procedure was completed successfully.
• 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.
Test Step 6. Disconnect the 6V-2197 Magnetic Transducer Before Exiting the “Monitor/Calibrate Timing” Screen
A. Disconnect the 6V-2197 Magnetic Transducer from the ECM.
B. Exit the timing calibration screen on the electronic service tool.
Note: Exiting the timing calibration screen on the electronic service tool 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.
The magnetic transducer was disconnected before exiting the timing calibration screen on the electronic service tool.
• OK – STOP.
• Not OK – If the magnetic transducer is still installed after exiting the timing calibration screen on the electronic service tool, vehicle speed diagnostic codes may be generated.
Repair: If vehicle speed diagnostic codes are generated, the vehicle speed diagnostic codes should be cleared.