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 P1403 will set if the EGR solenoid control feedback voltage is below a calibrated voltage when the EGR solenoid is commanded Off.
DTC PARAMETERS
DTC P1403 will set if the EGR solenoid control feedback voltage is below 2.6 volts when the EGR solenoid is commanded Off when:
| • | Condition exists for longer than 0.5 seconds |
| • | Battery is between 7.5 and 15.0 volts |
| • | Engine is cranking/running |
DTC P1403 diagnostic runs continuously with the ignition On and EGR solenoid commanded Off.
P1403 is a (type B) DTC
DIAGNOSTIC AIDS
Inspect harness for chaffed wires and connectors that may cause a short to ground condition.
DTC P1403 can set if a short to ground is detected on either circuits (251) at the ECM.
