Glow Plug Inhibit Switch - Diagnosis

Number: 84-196

Section: 6D (VIv)

Date: Sept., 1984

Subject: GLOW PLUG INHIBIT SWITCH


Model and Year: 1984 "C/K/G/P/D" TRUCKS
WITH 6.2L DIESEL ENGINE

TO: ALL CHEVROLET DEALERS


DIAGNOSIS OF SWITCH

The following procedure is provided for proper diagnosis of the glow plug inhibit switch.

1. Run engine for approximately fifteen (15) minutes to warm engine.

2. With the engine not running and coolant temperature above 52~C (125~F), disconnect plug from inhibitor switch terminals.

3. Use ohm-meter on lowest scale to check for an open circuit. A self-powered test light may also be used. Test across terminals, then from each terminal to ground.

4. If the switch is closed or grounded (test light on or low ohm reading on meter), the switch is faulty. if switch is open and not grounded (test light off or high reading on meter), the switch is functioning properly.


INSTALLATION OF SWITCH

The inhibit switch can be damaged easily during installation. DO NOT use an open-end wrench to install this switch. A socket should be used. The inhibit switch can fail from being installed with too high of a torque. Use 19 to 27 N-m (13 to 20 lbs.ft.) torque when installing this switch. DO NOT OVERTORQUE.



1. Battery

2. Ignition Switch

3. 20 amp

4. TOC, Brake, Switch

5. 15 amp

6. Fuel Solenoid

7. Glow Plug Relay

8. Inhibit Switch

9. Glow Plugs

10. Glow Plugs Light

11. Glow Plugs Controller

12. Generator

13. Generator Tell-Tale

14. Fast Idle Solenoid
15. Cold Advance Solenoid

16. Temperature Switch (Opens at 95~F)