1994 PCED OBDI-A
SECTION 18A: Diesel Diagnosis — 7.3L DI Engine
R: Glow Plug Lamp (GPL)
  R: Introduction  
 

R1 DIAGNOSTIC TROUBLE CODE (DTC) 516

Does WAIT TO START light remain on?
YesNo
GO to R2.GO to R3.
 

R2 CHECK CIRCUIT 464 (BK/PK) FOR SHORT

Is WAIT TO START light on?
YesNo
SERVICE ground short in Circuit 464 (BK/PK) between warning light and PCM. RERUN Scan Tool Diagnostic Test.REPLACE PCM. RERUN Scan Tool Diagnostic Test.
 

R3 CHECK FUSE FOR OPEN

Is fuse OK?
YesNo
GO to R4.GO to R5.
 

R4 CHECK WARNING LIGHT BULB FOR OPEN

Is bulb OK?
YesNo
GO to R6.REPLACE bulb. RERUN Scan Tool Diagnostic Test.
 

R5 CHECK CIRCUIT 464 (PK/PK) FOR GROUND SHORT

Is resistance greater than 10,000 ohms?
YesNo
REPLACE fuse. RERUN Scan Tool Diagnostic Test.SERVICE ground short in Circuit 464 (BK/PK). REPLACE fuse. RERUN Scan Tool Diagnostic Test.
 

R6 CHECK FOR OPEN CIRCUIT 640 (R/Y)

Is B+ present?
YesNo
GO to R7.SERVICE open in Circuit 640 (R/Y) between fuse and warning light. RERUN Scan Tool Diagnostic Test.
 

R7 CHECK FOR OPEN IN CIRCUIT 464 (BK/PK)

Is resistance greater than 10,000 ohms?
YesNo
SERVICE open in Circuit 464 (BK/PK). RERUN Scan Tool Diagnostic Test.REPLACE PCM. RERUN Scan Tool Diagnostic Test.