DTCs P1516 (IMRC or IMSC input error bank No. 1) and P1517 (IMRC or IMSC input error bank No.
2) indicate KOEO or Continuous Memory self-test failed when IMRC or IMSC monitor circuit signal fell
below or exceeded expected calibrated range. Possible cause is binding, seizing, damage or obstruction of
IMRC or IMSC mechanical system.
DTCs P1518, P1537 and P1538 may indicate IMRC or IMSC Bank No. 1 or Bank No. 2 stuck open.
KOEO or Continuous Memory self-test failed when IMRC or IMSC monitor circuit signal falls below
expected calibrated range at closed throttle. Possible causes are:
z
IMRC Or IMSC SIG Circuit Shorted To PWR GND Or SIG RTN
z
Faulty IMRC Or IMSC Actuator
z
Faulty Powertrain Control Module (PCM)
DTC P1519 indicates IMRC or IMSC may be stuck closed. KOEO or Continuous Memory self-test failed
when IMRC or IMSC monitor circuit signal exceeded expected calibrated range with IMRC or IMSC
activated. Possible causes are:
z
Faulty Vacuum Hoses
z
Faulty Vacuum Solenoid
z
Faulty Vacuum Actuator
z
IMRC Or IMSC Actuator Cable, Lever Or Gears Binding Or Seized
z
Cables Improperly Routed, Binding Or Seized
z
Faulty IMRC Or IMSC Actuator
z
Damaged Or Disconnected IMRC Or IMSC Housing Return Springs
z
Lever Return Stop Obstructed Or Bent
z
Lever Wide Open Stop Obstructed Or Bent
z
IMRC Or IMSC Monitor Circuit Open Or Shorted To VREF
z
IMRC Or IMSC SIG RTN Circuit Open Or Shorted To VPWR Or GND
z
IMRC Or IMSC VPWR Circuit Open
On models equipped with cable operated IMRC or IMSC, check IMRC or IMSC cables for correct
routing and possible binding. Ensure cable core wire (if equipped) has slack at IMRC or IMSC housing
and that lever contacts close plate stop screw. Ensure return springs operate properly and plates open and
close fully. On models with vacuum operated systems, engine must run for 20 seconds, then perform
KOEO self-test. On all models, operate IMRC or IMSC plates at intake manifold while checking for
binding and sticking. If any faults are found, go to next step. If no faults are found, go to step 17).
16) Perform IMRC Or IMSC Physical Test
On Focus 2.0L 2V, Econoline and Pickup 4.2L, and Ranger 2.3L, remove electronic actuator assembly.
On all others, disconnect IMRC or IMSC linkage or cable(s) from intake runner(s). Rotate IMRC or
IMSC lever(s) from fully closed to fully open, and back to fully closed positions while checking for
WARNING:
Be careful when operating IMRC or IMSC by hand. IMRC or IMSC
return springs are strong and may cause plates to close suddenly.
2003 Ford Pickup F150
2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline