Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1985F 250 2WD PICKUP V8-6.9L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTGLOW PLUG SYSTEMRELAYS AND MODULES - GLOW PLUG SYSTEMGLOW PLUG CONTROL MODULETESTING AND INSPECTION
1985 Ford F 250 2WD Pickup V8-6.9L DSL
Glow Plug Control Module: Testing and Inspection
1985 Ford F 250 2WD Pickup V8-6.9L DSLSECTION 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
BASIC DIAGNOSTIC TEST
LAMP DIAGNOSTIC PROCEDURE
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
TEST A4
PINPOINT TEST B
TEST B1 - B2
TEST B3 - B5
TEST B6 - B8
PINPOINT TEST C
TEST C1 - C3
TEST C4 - C7
TEST C8 - C9
TEST C10 - C11
TEST C12 - C13
PINPOINT TEST D
TEST D1
PINPOINT TEST E
TEST E1 - E2
TEST E3 - C5
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
Pinpoint Test A1 - A3:
TEST A4
Pinpoint Test A4:
PINPOINT TEST B
TEST B1 - B2
Pinpoint Test B1 - B2:
TEST B3 - B5
Pinpoint Test B3 - B5:
TEST B6 - B8
Pinpoint Test B6 - B8:
PINPOINT TEST C
TEST C1 - C3
Test Lamp Does Not Light Pinpoint Test C1 - C3:
TEST C4 - C7
Pinpoint Test C4 - C7:
TEST C8 - C9
Pinpoint Test C8 - C9:
TEST C10 - C11
Pinpoint Test C10 - C11:
TEST C12 - C13
Pinpoint Test C12 - C13:
PINPOINT TEST D
TEST D1
Pinpoint Test D1:
PINPOINT TEST E
TEST E1 - E2
Pinpoint Test E1 - E2:
TEST E3 - C5
Pinpoint Test E3 - E5:
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.