Fig. 371: Identifying Output Shaft Speed Sensor Circuits & Harness Connector Terminals (All Others)
Courtesy of FORD MOTOR CO.
Testing
1) For Continuous Memory Only DTCs P0720, P0721, P0722, P0723 & P1900: Verify Drive Cycle
DTC P0720 is set when PCM detects insufficient input signal from OSS sensor. DTC P0721 is set when
PCM detects noise interference on OSS sensor signal. DTC P0722 is set when PCM detects missing OSS
sensor signal. DTCs P0723 and P1900 are set when PCM detects irregular or interrupted OSS sensor
signal. Possible causes are:
z
OSS Sensor Circuit Open, or Shorted To GND or PWR
z
Wiring Misrouted, Damaged Or Insulation Worn
z
After Market Add-On
z
Harness Intermittently Shorted Or Open, Connector Damaged Or Not Properly Seated
z
Faulty Or Incorrectly Installed OSS Sensor
z
Faulty PCM
Using scan tool, access OSS PID from PID/DATA MONITOR & RECORD menu. Road test vehicle and
observe OSS PID. Ensure transmission shifts through all gear ranges, up and down. If OSS PID value
increases and decreases with engine and vehicle speed, go to next step. If OSS PID value does not
increase and decrease with engine and vehicle speed, perform the following:
z
On Focus 2.0L M/T, go to step 3).
z
On all others, go to step 5).
2) Visual Inspection
Turn ignition switch to OFF position. Disconnect OSS sensor connector located on side of transmission.
Inspect connector for loose, damaged or corroded terminals. Repair as necessary. If connector is okay,
fault is unable to be duplicated at this time. Go to TEST Z, step 1) and check for intermittent faults.
NOTE:
For additional testing information, see DIAGNOSTIC AIDS.
2003 Ford Pickup F150
2003 ENGINE PERFORMANCE Self-Diagnostics - CNG, Flex-Fuel & Gasoline