System Tests: Notes

WARNING: This page is about a different car, the 2002 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

NOTE: Before beginning system tests, perform PRELIMINARY INSPECTION under TROUBLE SHOOTING. A Digital Volt-Ohmmeter (DVOM) is required to test the Natural Gas Vehicle (NGV) analog instrument panel system. After repairs are complete, ensure all components are properly installed and all harness connectors are connected properly.

SYMPTOM INDEX

Symptom

Perform Test

No Communication With Natural Gas Vehicle Module

Integrated Circuit Display Inaccurate Or Inoperative

Fuel Gauge Inaccurate

⁽¹⁾

Using NGS tester, perform data link diagnostic self-test for NGV module. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in MODULE COMMUNICATIONS NETWORK - ECONOLINE article. If any DTCs are retrieved, perform appropriate test. See NATURAL GAS VEHICLE MODULE DIAGNOSTIC TROUBLE CODE INDEX table under SELF-DIAGNOSTIC SYSTEM. If no DTCs exist, perform TEST I: ECU CIRCUIT FAILURE (DTC B1342) .