Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
Z15 KOER WIGGLE TEST PROCEDURE FOR THE PCM SENSORS
WARNING: WHEN CARRYING OUT ANY TEST STEPS, ALWAYS BE AWARE OF HANDS, CLOTHING OR TOOLS NEAR COOLING FANS, BELTS OR HOT SURFACES. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
Note: Remember that PIDs selected from the PCM PIDS/SIGNALS Chart display commanded values only. A DMM measurement is needed to display the actual values. Be sure to compare them. Look for fluctuations to occur during any part of the following test. The output state test may not control some outputs, such as injectors and ignition coils and may not be available for all actuators.
• Using the circuits chosen from the PCM PIDS/SIGNALS Chart, select only the recommended PIDs/signals to monitor with the scan tool. If a PID is not available for the circuit, use a DMM to check the value.
• Ignition ON, engine OFF.
• With the scan tool, turn on selected outputs using output state control. Refer to the scan tool instruction manual.
• Proceed to the area of the suspect wiring or component concern.
• Monitor the PID or DMM while tapping on the component.
• Monitor while wiggling the sensor harness wire from the component to the PCM.
• Look for abrupt changes in the values. Compare these actual values to the reference values in Section 6 , Reference Values.
Is there a mismatch between command and actual or are any values fluctuating in and out of range when compared to the reference value charts in Section 6 , Reference Values?
Yes | No |
|---|---|
REPAIR as necessary. VERIFY the repair. Clear the PCM DTCs. REPEAT the self-test. | GO to Z16 . |
Z16 KOER OUTPUT TEST PROCEDURE FOR THE PCM ACTUATORS
WARNING: WHEN CARRYING OUT ANY TEST STEPS, ALWAYS BE AWARE OF HANDS, CLOTHING OR TOOLS NEAR COOLING FANS, BELTS OR HOT SURFACES. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
Note: Remember that PIDs selected from the PCM PIDS/SIGNALS Chart display commanded values only. A DMM measurement is needed to display the actual values. Be sure to compare them. Look for fluctuations to occur during any part of the following test. The output state test may not control some outputs, such as injectors and ignition coils and may not be available for all actuators.
• Ignition ON, engine running.
• Proceed to the area of the suspect wiring or component concern.
• Monitor the PIDs with the scan tool and note the values. Compare the scan tool values with values from a DMM with the engine at idle. While tapping on the suspect component look for fluctuations in the values.
• If a coil for a coil on plug application is suspect, turn off the ignition. Gain access to the coil and measure continuity from the spark plug terminal to the signal terminal while tapping the coil. A large fluctuation in resistance indicates an intermittent open or short.
• Monitor while wiggling the sensor harness wire from the component to the PCM.
• Look for abrupt changes in the values. Compare these actual values to the reference values in Section 6 , Reference Values.
Is there a scan tool to DMM value mismatch or an idle fluctuation?
Yes | No |
|---|
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.