The exhaust gas recirculation (EGR) value consists of a pintle valve that moves by the use of an internal solenoid and an internal position sensor (potentiometer) which used to determine pintle valve position. The EGR solenoid receives power through the main relay when the ignition key is in the crank or run position. The ECM controls the EGR solenoid by supplying a ground to the EGR solenoid whenever exhaust gas needs to be recirculated into the intake manifold. The ECM monitors the EGR solenoid control feedback and EGR sensor signal (valve position) circuits for correct voltage levels at certain times. DTC P1405 will set if the EGR solenoid control feedback voltage is above a calibrated voltage when the EGR solenoid is commanded On.
DTC PARAMETERS
DTC P1403 will set if the EGR solenoid control feedback voltage is above 4.6 volts when the EGR solenoid is commanded On when:
| • | Condition exists for longer than 0.5 seconds |
| • | Battery is between 7.5 and 15.0 volts |
| • | Engine is cranking/running |
DTC P1405 diagnostic runs continuously with the ignition On and EGR solenoid commanded On.
P1405 is a (type B) DTC
DIAGNOSTIC AIDS
Inspect harness for chaffed wires and connectors that may cause a short to voltage condition.
DTC P1405 can set if a short to voltage is detected on either circuits (251) at the ECM.
