Service CD says:
HE50 DTC P1405: INSPECT UPSTREAM PRESSURE HOSE CONNECTIONS
Diagnostic Trouble Code (DTC) P1405 indicates that Continuous Memory Self-Test has detected the exhaust manifold side (upstream) differential pressure feedback D.P.F. EGR sensor pressure hose is off or plugged.
Possible causes:
-- Improper upstream pressure hose connection.
-- Upstream pressure hose plugged.
-- Plugged or damaged pressure pickup tubes.
l Inspect upstream hose at D.P.F. EGR sensor and orifice tube assembly for disconnect or poor connection.
l Is hose off or poorly connected?
Yes
REPAIR as necessary. RESTORE vehicle. COMPLETE PCM Reset to clear DTCs. COMPLETE EGR Monitor Repair Verification Drive Cycle (Refer to Section 2A, �«Drive Cycles�»). RERUN �«Quick Test�».
No
GO to �«HE51�».
HE51 INSPECT UPSTREAM PRESSURE HOSE FOR PLUGGING
NOTE:
It is essential that the D.P.F. EGR pressure hose used is the correct repair part and not a substitute.
l Visually inspect upstream pressure hose routing. Hose must not be pinched or have dips in it where water could settle or freeze.
l Remove upstream pressure hose and carefully inspect for plugging, water or leaks.
l Is there a fault detected in the hose?
Yes
REPAIR or REPLACE upstream pressure hose as necessary. RESTORE vehicle. COMPLETE PCM Reset to clear DTCs. COMPLETE EGR Monitor Repair Verification Drive Cycle (Refer to Section 2A, �«Drive Cycles�»). RERUN �«Quick Test�».
No
GO to �«HE52�».
HE52 CHECK ORIFICE TUBE ASSEMBLY AND D.P.F. EGR SENSOR
l Inspect the connection marked HI on the D.P.F. EGR sensor for plugging or damage at the sensor.
l Inspect the exhaust manifold side pressure pickup tube at the orifice tube assembly for plugging or damage.
l Is the D.P.F. EGR sensor or orifice tube assembly plugged or damaged?
Yes
REPAIR or REPLACE D.P.F. EGR sensor or orifice tube assembly as necessary. RESTORE vehicle. COMPLETE PCM Reset to clear DTCs. COMPLETE EGR Monitor Repair Verification Drive Cycle (Refer to Section 2A, �«Drive Cycles�»). RERUN �«Quick Test�».
No
GO to �«HE53�».
HE53 CHECK D.P.F. EGR SENSOR OUTPUT BY APPLYING VACUUM WITH HAND PUMP
l Disconnect pressure hoses at D.P.F. EGR sensor.
l Connect a hand vacuum pump to the downstream connection at sensor (intake manifold side of sensor or the smaller diameter pickup tube).
l Key on, engine off.
l Access DPFEGR PID with a scan tool and note PID value.
l Apply 27 to 30 kPa (8 to 9 in-Hg) vacuum to the D.P.F. EGR sensor and hold for a few seconds.
l Quickly release vacuum.
-- The DPFEGR PID voltage must be between 0.2 and 1.3 volt with the key on and no vacuum applied.
-- The DPFEGR PID voltage must increase to greater than 4.0 volts with the vacuum applied.
-- The DPFEGR PID must drop to less than 1.5 volts in less than 3 seconds when vacuum is released.
l Key off.
l Did the DPFEGR PID voltage indicate a fault in the D.P.F. EGR sensor?
Yes
REPLACE damaged D.P.F. EGR sensor. RESTORE vehicle. COMPLETE an EGR Monitor Repair Verification Drive Cycle (Refer to Section 2A, �«Drive Cycles�»). RERUN �«Quick Test�».
No
Fault not found. RESTORE vehicle. COMPLETE PCM Reset to clear DTCs. RERUN �«Quick Test�».
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Steve
