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Article No. 95-15-12	AUXILIARY POWERTRAIN CONTROL MODULE (APCM) - 7.3 DIT - AVAILABLE FOR AMBULANCES, TOW TRUCKS, AND OTHER VEHICLES REQUIRING MANUAL THROTTLE CONTROL
Publication Date: JULY 31, 1995

ISSUE:

Customer's may request an Auxiliary Powertrain Control Kit for ambulances, tow trucks, etc.  Dealers may not have information regarding the system required to perform these functions.

ACTION:

Refer to the following Service Procedure and System Diagnostics Summary for details.

SERVICE PROCEDURE

The Auxiliary Powertrain Control Module (APCM) kit provides an operator interface to the "drive-by-wire" control system.  The kit has the ability to affect charge protection, rpm control, and manual throttle control.  The kit contains the following:

• Installation instructions and hardware
• Programming and diagnostic booklet
• Operator instruction card
• Operation interface module and interface harness

NOTE:

THE KITS ARE COMPATIBLE WITH IN-CAB INSTALLATION ONLY.  THEY DO NOT ACCOMMODATE AUTOMATIC TRANSMISSION "SPLIT SHAFT" PTO OPERATION.  THEY DO NOT PROVIDE FOR REMOTE ACTIVATION OR INTERFACE WITH CUSTOM CUSTOMER INTERFACES.

The kit was originally released at the start of 1995 production as part of the Ambulance Package at an "AA" suffix design level.  A later kit release, "AC" suffix, features power-up in standby mode (auto and manual transmission vehicles) and a customer programming option to provide a "power-up active" function (auto transmission vehicles only).

The "AC" level part can be used to service the "AA" level part.

An F-Series kit, suffix "AD", features a lengthened harness.

Ambulance users needing the "AC" level function can exchange their "AA" kit for an "AC" level kit at no extra charge.

NOTE:

THE KIT MAY ALSO BE REFERRED TO AS AN APCM MODULE, AUXILIARY IDLE CONTROL, OR "HIGH IDLE CONTROL OPTION".  IT SHOULD NOT BE CONFUSED WITH THE 94-1/2 "SELECTABLE RPM CONTROL" CALIBRATION (TSB 94-19-18), WHICH IS NOT COMPATIBLE WITH THE APCM KIT.

NOTE:

1994-1/2 VEHICLES REPROGRAMMED WITH A 1995 OR LATER PCM CAN ALSO USE THE APCM KITS.

SYSTEM DIAGNOSTICS SUMMARY

System diagnostics are accomplished using codes presented on kit module display per instructions included with the kit.  The following is a reprint of the instructions (the instructions include a correction to the "AA" level kit module connector drawing):

1. Calibration information necessary for service by reprogramming can be found on the engine as opposed to the door lock face as with gas engines.
2. If programming a 1994-1/2 processor to used the kit, use the "Non-PTO" service bay calibration option.  The "PTO" service bay calibration option provides the 1994-1/2 "Selectable RPM Control" function only.  This calibration must not be used in a 1995 vehicle.
3. Econoline Cutaway vehicles built before 3/10/95 require a resistor (E5UZ-13A427-AB) installed in a connector in the driver side B-pillar to avoid loss of APCM function during 4-way flasher operation.
4. Customer should be advised to be sure that their problem is not related to their having deprogrammed a particular function.
5. Very irregular rpm control with high levels of black smoke may be encountered especially with light load/high rpm operation and a cold engine.  Their is no repair at this time for this condition.

OTHER APPLICABLE ARTICLES:

94-19-18

WARRANTY STATUS:

INFORMATION ONLY

OASIS CODES:

203000, 203100, 619400