P0412

DTC P0412
Secondary air valve power stage fault Drive cycle D:Signal out of range - above maximum.

Possible causes by suggested order of priority:
^ Connector C0572 C0573 C0575 ECM C634 (B) ECM C636 (B) C641 C0879
^ Open Circuit C636/43 (RG) - C641/1 (RG)
^ Short Circuit C636/43 (RG) - Ground
^ Open Circuit C636/42 (US) - C641/3 (US)
^ Short Circuit C636/43 (RG) - Ground
^ Open Circuit C641/2 (NK) - C634/8 (NO)
^ Short Circuit C641/2 (NK) - Ground
^ Open Circuit C0879/2 (R) - C0573/1 (R)
^ Short Circuit C0879/2 (R) - Ground
^ Open Circuit C0879/1 (B) - C0563/1
^ Open Circuit C0575/2 (NG) - ECM
^ Short Circuit C0575/2 (NG) - Ground
^ Open Circuit C0572/3 (NO) - C634/8 (NO)
^ Short Circuit C0572/3 (NO) - Ground
^ Fuse 37 (30 Amp)

Connector C0572 C0573 C0575 ECM C634 (B) ECM C636 (B) C641 C0879
CONNECTOR
^ Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.

Open Circuit C636/43 (RG) - C641/1 (RG)
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Short Circuit C636/43 (RG) - Ground
SHORT_CIRCUIT
^ Check resistance < 5.0 ohms

Open Circuit C636/42 (US) - C641/3 (US)
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Short Circuit C636/43 (RG) - Ground
SHORT_CIRCUIT
^ Check resistance < 5.0 ohms

Open Circuit C641/2 (NK) - C634/8 (NO)
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Short Circuit C641/2 (NK) - Ground
SHORT_CIRCUIT
^ Check resistance < 5.0 ohms

Open Circuit C0879/2 (R) - C0573/1 (R)
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Short Circuit C0879/2 (R) - Ground
SHORT_CIRCUIT
^ Check resistance < 5.0 ohms

Open Circuit C0879/1 (B) - C0563/1
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Open Circuit C0575/2 (NG) - ECM
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Short Circuit C0575/2 (NG) - Ground
SHORT_CIRCUIT
^ Check resistance < 5.0 ohms

Open Circuit C0572/3 (NO) - C634/8 (NO)
OPEN_CIRCUIT
^ Check resistance > 1M Ohm

Short Circuit C0572/3 (NO) - Ground
SHORT_CIRCUIT
^ Check resistance < 5.0 ohms

Fuse 37 (30 Amp)
POWER_DISTRIBUTION
^ Check for fuse not correctly inserted, fuse blown, fuse connections loose, damaged or corroded.
^ Certain diagnostics may also perform further checks to try and narrow down the fault, e.g. check if other circuits fed by the same fuse are also experiencing problems.