R: Glow Plug Lamp (GPL)
Introduction
Introduction
1994 PCED OBDI-A | SECTION 18A: Diesel Diagnosis — 7.3L DI Engine |
R: Glow Plug Lamp (GPL) Introduction | R: Pinpoint Tests |
Glow Plug Relay — Battery voltage ON time normally varies between 10 to 120 seconds.
Glow Plug Wait Lamp — Is a lamp to intended to indicate to the operator when the glow plugs have been on long enough to crank the engine, controlled by the PCM. Wait light on time is a function of engine oil temperature, barometric pressure and battery voltage. ON time normally varies between 2 to 10 seconds. Note: Wait light ON time is independent from glow plug relay ON time.
An open or shorted to ground glow plug relay or wait lamp circuit can be detected by an on demand output circuit check performed during the KOEO test.
Glow plug and glow plug harness problems cannot be detected by the PCM.
Do not perform any voltage checks with the engine running 115 v DC at 10 amps present on injector circuits.
You should enter this pinpoint test only when directed here from symptom flow charts.
This pinpoint test is intended to diagnose only the following:
The glow plug light indicates when the glow plugs are energized. When the light goes off, the engine is ready to be started.
| R: Pinpoint Tests |