Honda ACCORD HYBRID 2005 Service Manual page 256

Fuel and Emissions Systems
S y s t e m D e s c r i p t i o n
Electronic Control System
The functions of the fuel and emission control systems are managed by the powertrain control m o d u l e (PCM).
Self-diagnosis
The PCM detects a failure of a signal f r o m a sensor or f r o m another control unit and stores a T e m p o r a r y DTC or a DTC.
Depending on the failure, a DTC is stored in the first or second drive cycle. W h e n a DTC is stored, the PCM turns on the
malfunction indicator lamp (MIL) by supplying ground to the MIL circuit.
• One Drive Cycle Detection Method
W h e n an abnormality occurs in the signal f r o m a sensor or f r o m another control unit, the PCM stores a T e m p o r a r y
DTC and a DTC at the same t i m e for the failure and turns on the MIL immediately.
• T w o Drive Cycle Detection Method
W h e n an abnormality occurs in the signal f r o m a sensor or f r o m another control unit in the first drive cycle, the PCM
stores a Temporary DTC. The MIL does not come o n . If the failure continues in the second drive cycle, the PCM
stores a DTC and turns on the MIL.
Fail-safe Function
W h e n an abnormality occurs in the signal f r o m a sensor or f r o m another control unit, the PCM ignores that signal and
assumes a p r e - p r o g r a m m e d value that allows the engine to continue running. A DTC is stored, and the MIL comes on.
MIL Bulb Check and Readiness Code Condition
W h e n the ignition switch is first t u r n e d ON (II), the PCM supplies ground to the MIL circuit for 15 to 20 seconds to
check the bulb condition. If any readiness codes are not set to complete, the MIL flashes five times. If all readiness
codes are set to complete, the MIL goes out.
Self Shut Down (SSD) Mode
After the ignition switch is t u r n e d OFF, the PCM stays on (up to 15 minutes) to m o n i t o r the vehicle. If the PCM
connector is disconnected d u r i n g this t i m e , the PCM may be d a m a g e d , To cancel this m o d e , disconnect the negative
cable f r o m the battery or j u m p the SCS line w i t h the HDS after t u r n i n g the ignition switch OFF.
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