Speed Control Diagnostic Procedure - Correction

88ford03


SPEED CONTROL - DIAGNOSTIC PROCEDURES - SHOP MANUAL CORRECTION


Article No. 88-4-6

FORD: 1988 TAURUS

LINCOLN-MERCURY: 1988 SABLE

ISSUE: Some of the service information for the speed control diagnostic procedures in the 1988 Taurus/Sable Shop Manual is incorrect as published. The affected sections are 37-05-18, 37-05-24 and 37-05-27.

ACTION: If service is required, use the diagnostic procedures on pages 21 through 25 of this TSB. This information should be inserted in your 1988 Taurus/Sable Shop Manual.

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY"
Pinpoint Tests

Instructions for Using the Pinpoint Tests

^ Do not run any of the following Pinpoint Tests unless instructed by the Quick Test. Each Pinpoint Test assumes that a fault has been detected in the system with direction to enter a specific service routine. Performing any Pinpoint Test without direction from the Quick Test may produce incorrect results and cause replacement of undamaged components.

^ Do not replace any parts unless the test result indicates that they should be replaced.

^ When more than one service code is received, always start service with the first code received.

^ Do not measure voltage or resistance at the ECA or connect any test lights to it, unless otherwise specified.

^ Isolate both ends of a circuit, and turn the ignition key off whenever checking for shorts or continuity, unless otherwise specified.



^ Disconnect solenoids and switches from the harness before measuring for continuity, resistance or energizing by way of 12-volt source, unless otherwise instructed.

^ In using the Pinpoint Tests, follow each Step in order, starting from the first Step in the appropriate test. Follow each Step until the fault is found.

^ After completing any service to the IVSC system, verify that all components are properly reconnected and repeat the Quick Test.

^ An open is defined as any resistance reading greater than 5 ohms unless otherwise specified.

^ A short is defined as any resistance reading less than 10,000 ohms to ground, unless otherwise specified.

^ Refer to the following wiring diagram as necessary during Pinpoint testing.



DIAGNOSTIC BY SYMPTOM



BRAKE ON/OFF (BOO) - PINPOINT TEST B (Continued)



SERVO SOLENOIDS - PINPOINT TEST C



SPEED DOES NOT INCREASE DURING DYNAMIC TEST - PINPOINT TEST D