Doc. No. 503-0800ZE-M-01 ZP3-ECU Maintenance Manual
Page 16 Issue 1 (01/08/2006)
Extinguishing Door Monitor Unit "Fault" (Optional)
Indications
The Door Monitor buzzer sounds when it should not sound or does not sound when it should
sound.
Probable Cause
• Incorrect wiring to the board or door switch.
• A misunderstanding of the logic being applied.
Corrective Actions
1. Read the description of the function in the manual thoroughly and check that the operation is
well understood.
2. Inspect wiring and correct any faults.
3. Replace the door monitor board if you can’t correct the fault.
Extinguishing Control Unit Main Board Fault Diagnostic LED’s
Six LED’s are provided on the ECU main board for fault diagnosis as shown in Figure 1.
Figure 1: ECU Main Board
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