CARRIER-PLANETARY 9P8451 - Caterpillar

Use this procedure if the diagnostic code in Table 1 is active.
Table 1
Diagnostic Trouble Codes
CDL Code J1939 Code Code Description
(code descriptions may vary) Comments
261-11 637-11 Engine Timing Offset fault The wiring to the sensors might have the wrong polarity. The timing of the front gear train may be incorrect.
261-13 637-13 Engine Timing Calibration : Calibration Required A timing calibration is required for a new engine, replacing an Electronic Control Module (ECM) that fails to communicate or following work on the front gear train, the camshaft, or the crankshaft. If a 261-11 or 637-11 diagnostic code is active, verify that the wiring is installed correctly to the engine speed/timing sensors.The ECM can calibrate the mechanical differences between the Top Center (TC) of the flywheel and the TC of the timing gear on the camshaft. A transducer signals the TC of the flywheel to the ECM when a notch on a counterweight passes by the transducer. The engine speed/timing sensor signals the TC of the timing gear to the ECM. Any offset between the TC of the flywheel and the TC of the timing gear is stored into the memory of the ECM.Note: A timing calibration will not increase the available engine power.Table 2 lists the special tools that are required in order to perform this procedure.
Table 2
Required Special Tools
Part Number Description
7X-1171 Transducer Adapter
6V-2197 Transducer
7X-1695 Cable as
170-3519 Harness (1)
(1) This item is not required if the engine harness has a connector for timing calibration.
Illustration 1 g03048383
(A) Timing mark
(B) Idler gear
Table 3
Troubleshooting Test Steps Values Results
Step 1 applies to C15 and C18 engines only.
1. Check the Gear Train Timing
The camshaft gear will be off a half tooth if the engine is timed when Cylinder # 6 is at Top Dead Center (TDC). The engine MUST be timed when Cylinder #1 is at TDC. This could be possible anytime you do not time the engine at the crank to idle gear mesh.
Note: Remove the rocker arms before rotating the engine to prevent piston/valve damage from occurring.
A. If the engine is at TDC for cylinder 6, remove cam idler gear (B) and rotate the crankshaft 360 degrees and repin the flywheel.
B. Install idler gear (B).
C. Check timing mark (A).
D. Rotate the engine by hand 360° to ensure that the engine rotates freely. If the engine does not rotate freely, the engine is not timed correctly. Remove the front housing and check all timing marks. Refer to Testing and Adjusting, "Gear Group (Front) - Time" for the correct procedure.
E. Connect to Cat® Electronic Technician (ET) and clear the DTC.
F. Start the engine.
Diagnostic code
Result: After starting the engine the code is still present.
Proceed to Test Step 2.
Result: After starting the engine the code did not return.
Return the unit to service.
Table 4
Crankshaft Rotation
Engine Model Number of Degrees Direction of Rotation
C7 100 Normal Rotation
C-9 85 Normal Rotation
C9 85 Normal Rotation
C9.3 85 Normal Rotation
C-10 60 Opposite Normal Rotation
C11 75 Normal Rotation
C-12 60 Opposite Normal Rotation
C13 75 Normal Rotation
C-15 60 Opposite Normal Rotation
C15 60 Opposite Normal