PRODUCT IMPROVEMENT PROGRAM FOR REMOVING THE ELECTRIC THROTTLE SENSOR INPUT TO THE ECM ON CERTAIN 3508B, 3508C, AND 3512C PETROLEUM ENGINES Caterpillar

PRODUCT IMPROVEMENT PROGRAM FOR REMOVING THE ELECTRIC THROTTLE SENSOR INPUT TO THE ECM ON CERTAIN 3508B, 3508C, AND 3512C PETROLEUM ENGINES

Usage:

REBE1856-00

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10Apr2007

U-131

A-113

D-111

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*Priority*	PRODUCT IMPROVEMENT PROGRAM FOR REMOVING THE ELECTRIC THROTTLE SENSOR INPUT TO THE ECM ON CERTAIN 3508B, 3508C, AND 3512C PETROLEUM ENGINES
1901 1421		PI31239

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NOTE:

This Program must be administered as soon as possible. When reporting the repair, use "PI31239" as the Part Number and "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description code. Exception: If the repair is done after failure, use "PI31239" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.

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NOTE:

The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

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COMPLETION DATE	TERMINATION DATE
31Oct2007	30Apr2008

PROBLEM

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Certain 3508B, 3508C, and 3512C Petroleum Engines are experiencing 91-08 throttle position sensor diagnostic codes due to an abnormal speed signal. Investigation shows that there are two speed signal wires connected to the low idle switch causing the abnormal speed signal. One speed signal wire comes from the 9X-9591 Electric Speed Control (part of the 134-6323 Electric speed control Harness Gp) and the other speed signal wire comes from the 216-8684 air actuated speed control (part of the 287-8244 harness group). The engine will not operate properly with two speed signal inputs.

AFFECTED PRODUCT

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Model	Identification Number
3508B	CBB00538-00552
3508C	LLE00137-00146, 151-153, 155-182, 185, 188-199, 203-204, 206, 208-212
3512C	LLF00134-00145, 147-148, 150-156

PARTS NEEDED

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Qty	Part Number	Description
1	8L8413	STRAP-CABLE

ACTION REQUIRED

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See Rework procedures.

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OWNER NOTIFICATION

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U.S. and Canadian owners will receive the attached Owner Notification.

SERVICE CLAIM ALLOWANCES

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Caterpillar		Dealer Suggested		Customer Suggested
Parts %	Labor Hrs%	Parts %	Labor Hrs%	Parts %	Labor Hrs%
100%	100%	0%	0%	0%	0%

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NOTE: This is a 1.0-hour job

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PARTS DISPOSITION

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Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.

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COPY OF OWNER NOTIFICATION FOR U.S. AND CANADIAN OWNERS

XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999

PRIORITY - PRODUCT IMPROVEMENT PROGRAM FOR REMOVING THE ELECTRIC THROTTLE SENSOR INPUT TO THE ECM

MODELS INVOLVED - CERTAIN 3508C, 3512B, AND 3512C PETROLEUM ENGINES

Dear Caterpillar Product Owner:

The engine listed above were shipped from the factory with speed signal inputs from both the electrical speed control and air actuated speed control. The engine will not operate properly with inputs to the ECM from both speed controls.

Contact your local Caterpillar dealer immediately to schedule this service and advise them of which speed control input (electrical or air actuated) you want to use for your engine. The dealer will advise you of the time required to complete this service.

Please refer the dealer to their Service Letter dated 10Apr2007 when scheduling this service.

We regret the inconvenience this may cause you, but urge you to have this service performed as soon as possible to prevent unscheduled downtime.

Caterpillar Inc.

Identification #(s)

Attached to 10Apr2007 Service Letter

Rework Procedure

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For Engines that will use the Air Actuated Throttle Sensor:

(1) Remove the existing green wire marked F702 from terminal 1 of the low idle switch. Verify that the wire removed is the signal wire coming from the "S" terminal on the 9X-9591 electric speed control group. The signal wire is part of the 134-6324 harness assembly.
(2) Electrically protect this wire from shorting to adjacent metal part with heat shrink tube and secure with the nylon tie strap (P/N 8L-8413).
(3) Verify that the green wire marked F702 from the Air Actuated Speed Control Harness assembly (P/N 287-8245) is still attached on the low idle switch terminal 1.

For Engines that will use the Electric Speed Control Sensor:

(1) Remove the green wire marked F702 from the Air Actuated Speed Control Harness assembly (P/N 287-8245) attached on the low idle switch terminal 1.
(2) Electrically protect this wire from shorting to adjacent metal part with heat shrink tube and secure with the nylon tie strap (P/N 8L-8413).
(3) Verify that the green wire marked F702 from the "S" terminal on the 9X-9591 electric speed control group is attached to terminal 1 of the low idle switch. The signal wire is part of the 134-6324 harness assembly.