Glow Plug Control Module: Testing and Inspection

BASIC TEST
Perform the glow plug system diagnostic test (referred as Basic test) first. If the vehicle passes the Basic test without running any Pinpoint tests, you will know the glow plug system is functioning properly. The vehicle's problem exists somewhere else other than the glow plug system. If a step of the Basic test fails, run only the Pinpoint test specified by the failed step. Refer to glow plug diagnostic test point chart for test lamp connections and glow plug system wiring harness test points. Perform only those services specified by the Pinpoint tests. Operation of the glow plug system is completely automatic. If after completing a specific Pinpoint test it is determined that a component must be replaced, the glow plugs should be disconnected until the system has been rechecked by repeating the Basic test to make sure the glow plug system works properly.

TEST POINTS

Diagnostic Test Point Chart:

BASIC DIAGNOSTIC TEST

Basic Diagnostic Test:

LAMP DIAGNOSTIC PROCEDURE

Glow Plug Lamp Basic Test:

PINPOINT TEST
Do not perform any of the Pinpoint tests unless you are instructed to by the Basic test. Doing any Pinpoint test without direction from the Basic test is a waste of time, this may produce incorrect results and services. When any Pinpoint test services are completed, return directly to the beginning of the Basic test, do not continue with other Pinpoint tests. Do not replace any parts unless the test result indicates they should be replaced.

PINPOINT TEST A
TEST A1 - A3