94 Ranger 2.3L SOHC Trouble Code Help
#1
94 Ranger 2.3L SOHC Trouble Code Help
Well, the truck is still running, but I have some trouble codes.
I didn't want to start a new thread, even though the truck is now running.
I got some continuous memory code:
172- Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal indicates "Lean" (Bank #1)
181 - Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal not switching: indicates "lean" during part throttle engine operation (Bank #1).
332- Insufficient EGR flow detected.
542 - fuel pump circuit open connection - Electronic Control Assembly (ECA) to motor ground,
Then KOER test -
172 - Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal indicates "Lean" (Bank #1)
332 - Insufficient EGR flow detected.
538 - Insufficient RPM chang during Dynamic Response test (Engine Self Run Test)
I didn't want to start a new thread, even though the truck is now running.
I got some continuous memory code:
172- Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal indicates "Lean" (Bank #1)
181 - Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal not switching: indicates "lean" during part throttle engine operation (Bank #1).
332- Insufficient EGR flow detected.
542 - fuel pump circuit open connection - Electronic Control Assembly (ECA) to motor ground,
Then KOER test -
172 - Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal indicates "Lean" (Bank #1)
332 - Insufficient EGR flow detected.
538 - Insufficient RPM chang during Dynamic Response test (Engine Self Run Test)
#3
So on your trouble shoot, maybe consider backing up all the way to the EGR's VSV (Vacuum Switching Valve), to check it's diaphragm for leaks, then it's vacuum lnes all the way to the EGR valve & the EGR's diaphragm for leaks, along with the DPFE sensor & it's vacuum lines.
The code 538 suggests you didn't punch the gas pedal far enough on the "throttle up" portion of the KOER test, that checks the TPS sensor, so I wouldn't worry about it just now.
Just some more thoughts for consideration.
Let us know what you find.
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