K 20 3/4 Ton Pickup 4WD V8-379 6.2L DSL VIN C FI (1982)
4.
The VOM will then repeat an on-off cycle, about 12 VDC then 2 VDC.
NOTICE:
The power relay should also be heard turning on and off.
5.
If this occurs, the controller is functioning properly. Remove the positive lead of the VOM from the power relay coil and connect to the relay
output.
6.
With the ignition switch still on, the VOM should continue to repeat the on-off cycle of 3 above.
7.
If this is occurring, the proper voltage is being applied to the wiring harness connected to the glow plugs.
ASSEMBLY PLANT CHECKOUT OF 1983 "G" VAN 6.2L DIESEL GLOW PLUG SYSTEM
Normal Operation
With cold engine (below approximately 100~F), and good batteries (green eye visible):
1.
Ignition switch on.
2.
Glow plugs light "on" for 10 seconds maximum (engine below 20~F), "on" for 7 seconds maximum with engine at room temperature.
3.
Glow plug light then cycles on-off.
4.
Start engine.
5.
Glow plug light continues to cycle on-off for up to one (1) minute with cold engine (below 20~F), less time if engine is warmer.
6.
Light remains off as long as engine is running.
Visual Check
If glow plug light does not operate as above, check the following:
1.
Check connections on glow plug lamp jumper harness in I.P. area.
a.
"Ground" at bus bar ground terminal.
b.
Fuse block.
c.
Two (2) wire connections to bulkhead connector (ORN/DBL. BLK. stripe and YEL/DBL. BLK. stripe).
2.
Check connections in engine compartment.
a.
"Ground" at stud - power steering brace.
b.
Glow plug relay 2-way connector and connections at studs.
c.
Glow plug controller.
d.
2-Way connector on delcotron.
If all connections are intact, but glow plug system is not operating as stated, proceed with normal diagnostic procedure. DO NOT BYPASS OR
MANUALLY OPERATE WITH GLOW PLUG RELAY.
GLOW PLUG
THERMAL CONTROLLER CHECK
With connector removed from controller, the controller heater circuits may be checked using a high impedance ohmeter. However, this check will not dete
Pin 3 - Pin 2 .40 to .75 Ohms
Pin 5 - Pin 1 130 Ohms - 10%
Pin 4 - Pin 5 27 Ohms - 3 Ohms
Pin 2 - Pin 6 Continuity ("0" ohms)
GLOW PLUGS LAMP
CYCLES ON AND OFF
