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Test Sequence II

  1. Turn ignition "OFF". Apply parking brake and place transmission lever in Park position. Disconnect Manifold Absolute Pressure (MAP) and Inlet Air Temperature (IAT) sensors from wiring harness. Install Yellow Test Fixture (203814) to MAP sensor connector.
  2. Install Brown Test Fixture (294156) to IAT sensor connector. Start and run engine until normal operating temperature is reached. Ensure engine is at curb idle.
  3. Set test selector switch to "MAP" and note voltage reading. Reading should be 3.5-5.5 volts. If not, perform MANIFOLD ABSOLUTE PRESSURE SENSOR NOT WITHIN LIMITS  procedure. See COMPONENT DIAGNOSIS  in this article. Perform testing and repairs as indicated before proceeding with test sequence.
  4. Set switch to "IAT". Note voltage reading. Reading should be 5.2-7.2 volts. If not, perform INLET AIR TEMPERATURE SENSOR NOT WITHIN LIMITS  procedure under COMPONENT DIAGNOSIS before proceeding with test sequence.
  5. Set switch to "TAB". Raise engine speed briefly to 1600-1800 RPM, release throttle, and measure voltage and time span. Voltage should go from 1.6 volts to more than 10.5 volts within 55-65 seconds. If not, complete test sequence before performing COMPONENT DIAGNOSIS testing and repairs.
  6. Set switch to "EVP". Install Speed Control Tester (Snap-On GA-437) and set engine speed to 1550-1650 RPM. Note voltage and spark advance data. See Ford's Vehicle Emission Control Information Label on valve cover. If voltage and spark are incorrect, complete test sequence COMPONENT DIAGNOSIS testing and repairs.
  7. Remove speed control tester and turn ignition off. Remove MAP and IAT sensor test fixtures. Reconnect sensors to harness, go to DATA ANALYSIS .
    NOTE: The Vehicle Emission Control Information label on some 1978 models is difficult to read. The TEST SEQUENCE II limits from label are given below. For California models (Calibration 8-11L-R11), spark advance is 27-34 degrees BTDC. EGR valve position sensor voltage is 3.50-4.50 volts. On all other models (Calibration 8-11D-RO), spark advance is 48-54 degrees BTDC. EGR valve position sensor voltage is 4.20-5.00 volts.
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