TEST
ACTION
APPLICABILITY
7
Disconnect the vacuum hose from the EGR Valve. Inspect the vacuum hose for any
obstructions.
Connect a Vacuum Pump to the EGR Valve.
Start the engine.
Using the Vacuum Pump, apply vacuum to the EGR Valve.
Does the engine run rough or stall at idle?
All
Yes
→ Go To 8
No
→ Remove the EGR Valve and inspect the valve for an obstruction
that would keep the valve form opening. If OK, replace the EGR
Valve.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
8
Turn the igntion off.
Disconnect the EGR Solenoid harness connector.
Turn the ignition on.
Using a 12-volt Test Light connected to ground, probe the (F202) Fused Ignition
Switch Output circuit in the EGR Solenoid harness connector.
Does the 12-volt test light illuminate?
All
Yes
→ Go To 9
No
→ Repair the (F202) Fused Ignition Switch Output circuit for an
open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
9
Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Turn the ignition on.
Measure the voltage of the (K35) EGR Solenoid Control circuit in the EGR Solenoid
connector.
Is the voltage above 1.0 volts?
All
Yes
→ Repair the (K35) EGR Solenoid Control circuit for a short to
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 10
10
Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the EGR Solenoid harness connector.
Measure the resistance of the (K35) EGR Solenoid Control circuit between the PCM
harness connector and the EGR Solenoid harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 11
No
→ Repair the (K35) EGR solenoid control circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
111
DRIVEABILITY - SBEC
P0401 - EGR SYSTEM FAILURE —
Continued