State Emission Test and Key On/Engine Off Wiggle Test
87ford22
EEC IV - STATE EMISSION TEST AND KOEO Article No.
WIGGLE TEST - SHOP MANUAL CORRECTION 87-22-15
FORD: 1988 ESCORT/EXP, TEMPO, MUSTANG, TAURUS, THUNDERBIRD, FORD
LINCOLN-MERCURY: 1988 TOPAZ, SABLE, COUGAR, MERCURY, MARK VII, CONTINENTAL, LINCOLN TOWN CAR
LIGHT TRUCK: 1988 RANGER, BRONCO II, E SERIES, F SERIES, BRONCO, AEROSTAR
ISSUE: The state emission test and keyon/engine-off (KOEO) wiggle test are incorrect as published in the 1988 Engine/Emission Diagnosis Manual, Volume H, Sections 2-19, 2-20, 16-25, and 16-26.
ACTION: If service is required, use the diagnostic procedures on the following Pages.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY"
Diagnostic Routines
222 STATE EMISSION TEST FAILURE
NOTE: Canada and some states or metropolitan areas in the United States require periodic Idle Emission Tests. All Ford products have been designed to pass these tests. If a Ford product fails an Idle Emission Test, it is probable that 1) The engine temperature was not warm and stabilized prior to the test. 2) The vehicle had idled excessively long prior to the test.
Prior to starting any services, complaints of Idle Emission Test failure should be verified by using the test procedure of the area which failed the vehicle if the area is approved by Ford for performance warranty.
The following example encompasses most of the emissions measurement modes of the current state idle test procedures:
Ensure that the engine is at normal operating temperature and that all accessories are turned off.
Read emissions at idle.
Run engine at 2500 +/- 300 RPM.
Read emissions within 30 seconds.
Return engine speed to idle.
Read emissions within 30 seconds.
Diagnostic Routines
APPENDIX: Diagnostic Aids
CONTINUOUS MONITOR MODE (WIGGLE TEST)
SPECIAL NOTES:
^ The Continuous Monitor Modes allow the technician to ATTEMPT to recreate an intermittent fault.
^ The STAR Tester and the "Check Engine" Light (MIL) will flash the LED. The STAR Tester may also sound an alert when a fault is recreated.
^ The needle of the VOM will sweep across the face of the meter when a fault is recreated.
KEY ON ENGINE OFF
1. Hook up a STAR Tester or VOM as shown in Quick Test Step 2.0.
2. Turn the ignition key to the ON position.
3. Activate, de-activate, and re-activate Self-Test.
4. You are now in the Continuous Monitor Mode.
5. Tap, move, and wiggle the suspect sensor and/or harness. If a fault is detected, a Service Code will be stored in memory and will be indicated as explained above depending on the type of equipment being used.
ENGINE RUNNING
1. Hook up a STAR Tester or VOM as shown in Quick Test Step 2.0.
2. Start the engine.
3. Activate Self-Test, wait 10 seconds, deactivate and reactivate Self-Test. DO NOT shut the engine off.
4. You are now in the Engine Running Continuous Monitor Mode.
5. Tap, move, and wiggle the suspect sensor and/or harness. If a fault is detected, a Service Code will be stored in memory and will be indicated as explained above depending on the type of equipment being used.
APPENDIX: Diagnostic Aids
HOW TO CLEAR THE CONTINUOUS MEMORY CODES
1. Run the Key On Engine Off Self-Test according to Quick Test Step 3.0A.
2. When the Service Codes begin to be displayed, deactivate Self-Test:
- STAR Tester: Unlatching the center button (up position).
- Analog VOM: Remove the jumper wire from between Self-Test Input (STI) connector and the Signal Return Pin of the Self-Test connector.
- "Check Engine" Light (MIL): Remove the jumper wire from. between Self-Test Input (STI) connector and the SIGNAL RETURN pin of the SelfTest connector.
- Message Center (Continental Only): Remove the jumper wire from between Self-Test input (STI) connector and the SIGNAL RETURN pin of the Self-Test connector.
4. The continuous service codes will be erased from the processor's memory.
OUTPUT STATE CHECK
The output state check aids in servicing output actuators associated with the EEC-IV system. It enables the technician to energize and de-energize most of the system output actuators on command. This mode is entered after all codes have been received from Key On Engine Off and Continuous Testing. At this time, leave Self-Test activated and depress the throttle. Each time the throttle is depressed the output actuators will change state from energized to deenergized or from de-energized to energized.
1. Enter Self-Test.
2. Code Output Ends.
3. Do Brief WOT.
4. EEC-IV Output To Actuators Energized.
5. Do Brief WOT.
6. EEC-IV Output To Actuators De-Energized.