PCM Controlled Lamps

The instrument panel indicators ignition 1 feed powers the PCM controlled lamps. The PCM controlled lamps operate as follows:

^ Hot Lamp, the PCM commands the Hot lamp ON when the engine coolant temperature exceeds 124°C (255°F). The PCM commands the Hot lamp OFF when the engine coolant temperature falls below 120°C (248°F).

^ Generator Lamp the PCM commands the generator lamp ON under the following conditions:

- When the engine speed is greater than 1200 RPM and system voltage falls below 10 volts for longer than 10 seconds. The PCM commands the generator ON when system voltage rises to above 12 volts.

- When the generator control circuit (L terminal) remains low for longer than 10 seconds.

- When the engine speed is below 2000 RPM and the generator PWM control circuit (F terminal) duty cycle remains low for longer than 20 seconds.

- When the engine speed is above 4000 RPM and the generator PWM control circuit (F terminal) duty cycle remains high for longer than 20 seconds.

^ Low Oil Level Lamp: The PCM commands the Low Oil Level Lamp ON if the Engine Oil Level sensor indicates that a low oil level condition exists. The PCM determines whether or not to test for low oil level based on the difference between engine coolant temperature at the last shutdown and engine coolant temperature at start-up. This is to ensure that the oil has drained back into the oil pan before testing.