BASIC KNOWLEDGE - TM-9-2320-303-24-10198

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

BASIC KNOWLEDGE

34.

IMPORTANT INFORMATION IN THE TROUBLESHOOTING PROCESS

Before beginning the troubleshooting process, read and understand the following:

WTEC III wire identification presents the wire number followed by the ECU terminal source

(i.e., 157-S30). If there is a letter suffix following the wire number, there is a splice between the ECU

source and wire destination (i.e., 136A-S16).

Shut off the engine and ignition before any harness connectors are disconnected or connected.

Remember to do the following when checking for shorts and opens:

-- Minimize movement of wiring harnesses when looking for shorts. Shorts involve wire-to-wire or

wire-to-ground contacts and moving the harnesses may eliminate the problem.

-- Wiggle connectors, harnesses, and splices when looking for opens. This simulates vehicle

movements which occur during actual operation.

When disconnecting a harness connector, be sure that pulling force is applied to the connector itself and

not the wires extending from the connector.

Resistance checks involving the wiring between the ECU connectors and other components adds about

one ohm of resistance to the component resistance shown.