Glow Plug System Trouble Shooting
- Connect a 12-volt test lamp between glow plug power relay output and ground. Turn ignition on. Test lamp should light, stay lit for 4-10 seconds, then cycle on and off. If so, go to next step. If test lamp does not light, perform GLOW PLUG TEST C . If test lamp stays on continuously, perform GLOW PLUG TEST B . If test lamp lights for 4-10 seconds and then goes out and stays out, perform GLOW PLUG TEST E .
- With test lamp still connected, start engine. Test lamp should cycle on and off for as much as 2 minutes, then turn off. If so, perform GLOW PLUG TEST A . If test lamp continues to cycle on and off after 2 minutes, perform GLOW PLUG TEST D . If test lamp does not light, perform GLOW PLUG TEST E .
NOTE:
Perform GLOW
PLUG SYSTEM TROUBLE SHOOTING
before performing
any GLOW PLUG TEST. Performing GLOW PLUG TESTS before
trouble shooting glow plug system will result in incorrect
test results.
After completing indicated GLOW PLUG TEST, return to
beginning of GLOW PLUG
SYSTEM TROUBLE SHOOTING
.
DO NOT
continue with other GLOW PLUG TESTS.
DO NOT
replace any
parts, unless test results indicate they should be
replaced.