HE5 PERFORM WIGGLE TEST ON D.P.F. EGR SENSOR AND CIRCUIT WHILE MONITORING DPFEGR PID FOR A SUDDEN CHANGE
While monitoring DPFEGR PID, tap on the D.P.F. EGR sensor and wiggle the wiring while looking for a sudden change in value as an indication of an intermittent.
HE19 COMPLETE A WIGGLE TEST ON D.P.F. EGR SENSOR AND CIRCUIT WHILE MONITORING DPFEGR PID FOR A SUDDEN CHANGE
While monitoring DPFEGR PID, tap on the D.P.F. EGR sensor and wiggle the wiring while looking for a sudden change in value as an indication of an intermittent.
HE20 DTC P0402: CHECK FOR EGR FLOW AT IDLE WITH EGR VACUUM HOSE DISCONNECTED
Note: If DTC P1405 is in continuous memory, diagnose that first starting with HE50.
Disconnect vacuum hose at EGR valve and plug hose.
Run Key On Engine Running (KOER) Self-Test.
Is KOER DTC P0402 output or unable to run KOER Self-Test due to engine stall or no start? Yes
KEY OFF. INSPECT pressure hoses first for pinching and icing.
If OK, REMOVE and INSPECT the EGR valve and EGR tube for signs of contamination,
unusual wear, carbon deposits, binding and other damage. REPAIR as necessary.
Fault is intermittent. INSPECT pressure hoses for pinching and
icing. REPAIR as necessary. If OK, GO to HE30
.
HE22 CHECK EGR SYSTEM VACUUM HOSES FOR INTEGRITY AND CONNECTION
Note: A pinched or plugged EGR vacuum hose can trap vacuum between the EGR vacuum regulator solenoid and EGR valve not allowing the EGR valve to close.
Trace each vacuum hose from EGR vacuum regulator solenoid and verify that each hose is connected correctly. (Refer to vehicle vacuum diagram label.)
Verify that the EGR valve vacuum hose is not pinched or plugged and routed properly.
Are vacuum hoses OK? Yes
RECONNECT vacuum hoses. GO to HE23
.
No
REPAIR vacuum hoses as necessary.
HE23 CHECK D.P.F. EGR SENSOR OUTPUT BY APPLYING VACUUM WITH HAND PUMP
HE24 CHECK FOR EGR FLOW AT IDLE WITH EGR VACUUM REGULATOR SOLENOID CONNECTOR OFF
Disconnect vacuum hose at EGR valve and connect hose to vacuum gauge.
Start engine and bring to an idle.
While monitoring vacuum gauge, disconnect the EGR vacuum regulator solenoid harness connector.
The EGR valve requires vacuum greater than 5.4 kPa (1.6 in-Hg) to begin to open. If the vacuum reading remains greater than 5.4 kPa (1.6 in-Hg) after the EGR vacuum regulator solenoid is electrically disconnected, this would indicate a mechanical fault in the EGR vacuum regulator solenoid.
Does the EGR vacuum remain greater than 5.4 kPa (1.6 in-Hg) at idle even after EGR vacuum regulator solenoid is electrically disconnected? Yes
This indicates a fault in the EGR vacuum regulator solenoid.
KEY OFF. GO to HE25
.
No
KEY OFF. GO to HE26
.
HE25 INSPECT EGR VACUUM REGULATOR SOLENOID VENT FOR PLUGGING
Note: A plugged EGR vacuum regulator solenoid vent will not allow EGR vacuum to vent to atmosphere.
Remove EGR vacuum regulator solenoid vent cap (if removable).
Remove filter and inspect for blockage or icing in some cases.
With the EGR vacuum supply port plugged, apply 34 to 51 kPa (10 to 15 in-Hg) of vacuum directly to EGR vacuum regulator solenoid vacuum source port with a hand vacuum pump. If the vacuum holds or is slow to release to atmosphere, the EGR vacuum regulator solenoid vent could be plugged or restricted.
Is the EGR vacuum regulator solenoid vent or vent filter plugged or restricted? Yes
REPAIR EGR vacuum regulator solenoid as necessary. If unable