gmctd
12-05-2004, 02:24 PM
OBD-II PCM fully controls glow duration referenced to Engine Coolant Sensor temperature output.
These schemes are workable to extend glow duration for cold weather, and\or 60G plug replacement.
A better scheme would to replace any glow plugs with the 'hi-heat quick-glows' currently available.
You'll need a double-pole double-throw dpdt toggle switch.
Will be more functional if the switch is spring-loaded return, such that when lever is toggled to up position and released, spring will return lever to down position.
Lever toggled up position, switch contact is between middle pole and down-end pole.
Lever toggled down position, switch contact is between middle pole and up-end pole
DPDT switch has two center poles, two top-end poles, two bottom-end poles
Left-side center pole connects to left-side up-end pole and left-side down-end pole
Right-side center pole connects to right-side up-end pole and right-side down-end pole
'Nother words - two separate switches in one little box, both controlled by one toggle-lever
Left-side = LS
Right-side = RS
Cut the Yellow control wire on pin B of the glow controller .
You will need to splice to each of the separated Yellow wires, so leave enough on B to be workable.
Connect a wire from LS bottom pole on the switch to +12v.
Splice a wire from the LS top pole to the Yellow wire NOT CONNECTED to pin B of your glow controller.This is PCM control wire.
Splice a wire from the LS center pole to the Yellow wire connected to pin B on the controller.
PCM monitors power on the glow plugs, setting a P0380 DTC if not as commanded.This step should prevent upsetting the PCM, but ya just never know...........
Cut the BROWN wire in one leg of large wiring to glow plugs.
Both ends will need splicing, so each should be of workable length.
Connect a wire from the RS top pole to Brown wire to PCM
Connect a wire from the RS center pole to Brown wire on glow plug wire.
RS bottom pole has no connection
Mount the switch such that lever up position is manual glow, down position is PCM glow.
Flip switch to MANUAL after PCM-commanded glow ends, WAIT-TO-START indicator is off.
A spring-loaded return type switch will ensure switch cannot be left in manual glow position, resulting in damaged glow plugs.
An alternative to this would be to connect a single-pole double-throw spdt switch in the Engine Coolant Sensor wire.
Center-pole to PCM
Bottom-pole to 100kohm resistor to ground
Top-pole to Engine Coolant Sensor
This scheme would convince PCM to give more glow-time because of extremely low coolant temps.
UP = extended glow duration and advance
DOWN = Engine Coolant Sensor control
Wait till PCM-commanded extended glow time ends, flip switch to off when engine is running smoothly
Spring-loaded return ensures no controlling errors
And, remember - you saw it here, first.
These schemes are workable to extend glow duration for cold weather, and\or 60G plug replacement.
A better scheme would to replace any glow plugs with the 'hi-heat quick-glows' currently available.
You'll need a double-pole double-throw dpdt toggle switch.
Will be more functional if the switch is spring-loaded return, such that when lever is toggled to up position and released, spring will return lever to down position.
Lever toggled up position, switch contact is between middle pole and down-end pole.
Lever toggled down position, switch contact is between middle pole and up-end pole
DPDT switch has two center poles, two top-end poles, two bottom-end poles
Left-side center pole connects to left-side up-end pole and left-side down-end pole
Right-side center pole connects to right-side up-end pole and right-side down-end pole
'Nother words - two separate switches in one little box, both controlled by one toggle-lever
Left-side = LS
Right-side = RS
Cut the Yellow control wire on pin B of the glow controller .
You will need to splice to each of the separated Yellow wires, so leave enough on B to be workable.
Connect a wire from LS bottom pole on the switch to +12v.
Splice a wire from the LS top pole to the Yellow wire NOT CONNECTED to pin B of your glow controller.This is PCM control wire.
Splice a wire from the LS center pole to the Yellow wire connected to pin B on the controller.
PCM monitors power on the glow plugs, setting a P0380 DTC if not as commanded.This step should prevent upsetting the PCM, but ya just never know...........
Cut the BROWN wire in one leg of large wiring to glow plugs.
Both ends will need splicing, so each should be of workable length.
Connect a wire from the RS top pole to Brown wire to PCM
Connect a wire from the RS center pole to Brown wire on glow plug wire.
RS bottom pole has no connection
Mount the switch such that lever up position is manual glow, down position is PCM glow.
Flip switch to MANUAL after PCM-commanded glow ends, WAIT-TO-START indicator is off.
A spring-loaded return type switch will ensure switch cannot be left in manual glow position, resulting in damaged glow plugs.
An alternative to this would be to connect a single-pole double-throw spdt switch in the Engine Coolant Sensor wire.
Center-pole to PCM
Bottom-pole to 100kohm resistor to ground
Top-pole to Engine Coolant Sensor
This scheme would convince PCM to give more glow-time because of extremely low coolant temps.
UP = extended glow duration and advance
DOWN = Engine Coolant Sensor control
Wait till PCM-commanded extended glow time ends, flip switch to off when engine is running smoothly
Spring-loaded return ensures no controlling errors
And, remember - you saw it here, first.