DIAGNOSTIC CODE 3-4

Checking for a defective module or loose connector

1.With the ignition key in the OFF position, reconnect the V-MAC II connectors.

2.Start the engine.

If blink code 3-4 is still active, check the V-MAC II module and connector for dirt, loose or broken pins, or repairable damage. If no repairable conditions are evident, replace the V-MAC II module. Retest to be sure the problem has been corrected.

If blink code 3-4 is not active, the procedures have corrected the problem. Check all connectors to ensure proper connections.

DIAGNOSTIC CODE 3-5 (BASIC)

DIAGNOSTIC BLINK CODE 3-5, BASIC TIMING ACTUATOR TESTS, BASIC MECHANICAL SECTION

These diagnostic procedures are broken down into three sections: Basic Mechanical, Electrical and Advanced Mechanical. Begin with the Basic Mechanical Section.

When performing electrical tests, it is important to wiggle wires and connectors to identify intermittent connection problems.

Blink Code 3-5

PID

SID

2

FMI 7

MID 142

Name Timing Actuator

Failure Mechanical system not responding

This fault is only active above a specific engine speed and load. It may be inactive by the time the truck reaches the service shop.