Engine Fire Test on Boeing 737 NG.
lets get Familiar with the locations of P7 and P8 panels in the cockpit.
you will find the P7 panel on the instrument Panel.
and, you will find the P8 panel on the control stand.
Do these steps to make sure the fire detection system is operational:
On the P8 panel, move the OVEAT HEAT DETECTION switches for Engine 1 and Engine 2 to the NORMAL position.
On the P8 panel, move and hold the TEST switch to the OVEATHEAT/FIRE position.
Make sure these lights on the P8 panel come on:
1) The amber ENG 1 OVERHEAT light.
2) The amber ENG 2 OVERHEAT light.
3) The red Engine 1 fire handle.
4) The red Engine 2 fire handle.
5) The red APU fire handle.
Make sure these lights on the P7 lightshield panel come on:
1) The two amber MASTER CAUTION lights.
2) The two red FIRE WARN lights.
3) The amber OVHT DET annunciator light.
Release the TEST switch.
1) Make sure all the above lights go off.
reference .
B737-600 AMM ENGINE FIRE DETECTION 26-11-00