Ford F-150 1998 - ESOF System Inspection and Verification; Electronic Shift on the Fly (ESOF)

To Next Page

To Previous Page

Table 2 — Transfer Case Shift Relays Outputs

Table 3 — Neutral Safety Switch Input Conditions

Table 4 — Contact Plate Sensor Position Codes

Refers to the code at the point of transition between two positions or areas of the sensor.

Inspection and Verification — Electronic Shift on the Fly (ESOF

1. Verify the customer concern by operating the 2WD/4WD engagement.

2. Visually inspect for the following obvious signs of mechanical and electrical damage.

Visual Inspection Chart

3. If the concern remains after the inspection, connect the New Generation STAR (NGS) Tester to the data link connector (DLC) located beneath the instrument

panel and select the vehicle to be tested from the NGS menu. If the NGS does not communicate with the vehicle:

 check that the program card is properly installed.

 check the connections to the vehicle.

 check the ignition switch position.

4. If the NGS still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.

5. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:

 CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418-00.

 NO RESP/NOT EQUIP for GEM, go to Pinpoint Test F.

 SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and perform self-test diagnostics for the

GEM.

6. If the DTCs retrieved are related to the concern, go to the GEM Diagnostic Trouble Code (DTC) Index to continue diagnostics.

7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.

GEM Diagnostic Trouble Code (DTC) Index

Mode Switch Position Resistance (Ohms)

2-Wheel Drive 4100-3700

4WD HIGH 1050-1150

4WD LOW 380-340

HI-to-LO LO-to-HI Mode

GROUND BATTERY 4 HIGH to 4 LOW

BATTERY GROUND 4 LOW to 4 HIGH

GROUND GROUND Brake Motor