Ford F-150 1998 User Manual

Transfer Case—ESOF
Refer to Wiring Diagrams Cell 34, Electric Shift Control for schematic and connector information.
Refer to Wiring Diagrams Cell 20, Starting System for schematic and connector information.
Refer to Wiring Diagrams Cell 59, Generic Electronic Module for schematic and connector information.
Electrical Shift on the Fly (ESOF) Vacuum Schematic
4WD Tables
Table 1 — 4WD Mode Switch Input Resistances
SECTION 308-07A: Transfer Case — General Information 1998 F-150/250 Workshop Manual
DIAGNOSIS AND TESTING
Procedure revision date: 12/04/2002
Special Tool(s)
73 Digital Multimeter or equivalent
105-R0051
New Generation STAR (NGS) Tester or equivalent
418-F048 (007-00500)
Vacuum Pump or equivalent
416-D001 (D83L-7059-A)
Page 1 of 741998 F-150/250 Workshop Manual
1/11/2011http://www.fordtechservice.dealerconnection.com/pubs/con...

Ford F-150 1998 Specifications

General

Brand	Ford
Model	F-150 1998
Category	Automobile
Language	English

Summary

Transfer Case ESOF System

Special Tool(s)

Lists specialized tools required for diagnostic procedures.

ESOF System Inspection and Verification

Electronic Shift on the Fly (ESOF)

Steps to inspect and verify ESOF system functionality and identify potential issues.

GEM DTC Index

GEM PID Index

ESOF Symptom Chart

4WD System Pinpoint Tests

Pinpoint Test A: 2WD to 4WD Shifting Issues

Diagnostic steps for vehicle not shifting between 2WD and 4WD modes properly.

Pinpoint Test B: 4WD High/Low Shifting Issues

Diagnostic steps for vehicle not shifting between 4WD High and 4WD Low modes.

Pinpoint Test C: Front Axle Engagement Problems

Diagnostic steps for front axle not engaging properly (motor movement OK).

Pinpoint Test D: 4x4 Indicator Lamp Issues

Diagnostic steps for 4x4 High/Low range indicator not operating properly.

Pinpoint Test E: 4x4 High Engagement at Speed Issues

Diagnostic steps for 4x4 High not engaging at speed properly.

Pinpoint Test F: GEM Module Communication Issues

Diagnostic steps for no communication with the GEM module.