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Inspect engine for obvious defects in specified systems. Repair as necessary. If no faults are found, go to 42) Perform KOER Self-Test z If KOER DTCs P0040, P0041, P1127, P1128 or P1129 are present, go to appropriate system test. z If KOER DTC (P1131, P2195) or (P1151, P2197) is present, go to next step. z If KOER DTC (P1132, P2196) or (P1152, P2198) is present, go to step 49). If none of these DTCs are present, proceed as follows: z If Continuous Memory DTC P0171, P0172, P0174 or P0175 is present, go to step 52). z If DTCs P1132, P2196 and/or P1152, P2198 are no longer present, reconnect fuel vapor hose. z If directed to this test to diagnose DTCs P1131, P1132, P1151 and/or P1152, perform evaporative z If no DTCs have repeated and no DTCs are present, fault is unable to be duplicated at this time. Go 43) HO2S Circuit Test (With Lean DTCs) If HO2S PID voltage is 1.3 volt or more, check SIG RTN circuit for open. Go to next step. If voltage is 44) Check SIG RTN Circuit For Open 45) Check HO2S SIG RTN Circuit For Open In Harness NOTE: If spark occurs when connecting jumper wire (indicating a short circuit),
2003 Ford Pickup F150 2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline
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