4.9l Feedback Carburetor Eec Iv Testing Ford Club Wagon E350

DIAGNOSIS & TESTING

This diagnostic procedure is used to test and service the EEC-IV system. It is divided into 2 test formats: QUICK TEST , a functional system test, and CIRCUIT TESTS , a number of specific circuit and component tests. To test and service EEC-IV system, perform the QUICK TEST first.

If vehicle passes KEY ON/ENGINE OFF , KEY ON/ENGINE RUNNING , and CONTINUOUS SELF-TEST of QUICK TEST without running any CIRCUIT TESTS , the EEC-IV is okay. Problem exists somewhere else besides the EEC-IV system. If QUICK TEST fails, perform only those tests that are specified by the failed step.

PREPARATION FOR TESTING

Correct test results for system are dependent on the correct operation of several related non-EEC components and systems. All non EEC problems should be corrected before attempting to diagnose the EEC system.

Before hooking up any equipment to diagnose the EEC system, make the following checks

1. Verify condition of air cleaner and air ducting.
2. Check all vacuum hoses for leaks, restrictions, and proper routing.
3. Check the EEC-IV system wiring harness electrical connections for corrosion, loose or detached connectors, loose wires or terminals, and proper routing.
4. Check the ECA, sensors and actuators for physical damage.
5. Perform all necessary safety precautions to prevent personal injury or vehicle damage.
6. Set parking brake and place shift lever in "P" for auto. trans., and Neutral for man. trans. DO NOT move shift lever during testing unless specifically directed to do so.
7. Turn off all lights and accessories, and make sure that vehicle doors are closed when making readings.
8. Check and correct coolant level.
9. Start engine and idle until upper radiator hose is hot and pressurized and throttle is off fast idle. Check for leaks around exhaust manifold, exhaust gas oxygen sensor, and vacuum hose connections.
10. Turn ignition key off. Service items as required, then go to «EQUIPMENT HOOK-UP»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__equipment-hook-up-scheme-70) .

Note. If engine will not start, starts but stalls, idles rough or runs rough, go through KEY ON/ENGINE OFF SELF-TEST . If any of the above conditions are still present after a code 11 in the KEY ON/ENGINE OFF SELF-TEST , go to TEST A - NO START , step 2) for a no start condition. If engine stalls or runs rough, go to DIAGNOSIS BY SYMPTOM TEST.

Analog VOM

1. Turn ignition key off. Connect jumper wire from Self-Test Input (STI) pigtail to pin No. 2 (Signal Return) on SELF-TEST connector. Set VOM at 0-15V DC range and connect positive lead of VOM to positive battery terminal.
2. Connect negative VOM lead to pin No. 4 (STO) on SELF-TEST connector. (Scheme 70) Connect timing light, then go to «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test).

STAR Tester

Turn ignition key off. Connect color coded adapter cable leads to STAR tester. Connect adapter cable's 2 service connectors to vehicle's SELF-TEST connectors. Connect timing light, then go to KEY ON/ENGINE OFF SELF-TEST .

Equipment Hook-Up. Scheme 70

TEST EQUIPMENT

The following equipment is recommended to diagnose and test EEC-IV system. Some equipment is REQUIRED to perform tests. DO NOT attempt to test this system without proper equipment. Damage to vehicle components will result if improper equipment is used.

1. Self-Test Automatic Read-Out (STAR) Tester is recommended but not required. It is specially built for the EEC-IV system and is used to display, as numerals, the 2-digit service codes that are programmed into the control module.
2. Analog Volt/Ohmmeter (VOM) with 0-20V DC range. This can be used as an alternate to the STAR tester.
3. Digital Volt/Ohmmeter (DVOM) with minimum 10 megaohm input impedance.
4. Breakout Box (Part No. 014-00322). This is a jumper wire assembly which connects between the vehicle harness and the ECA. The breakout box is REQUIRED to perform certain tests on the system. Ford Motor Co. specifically states that using the probe from a DVOM will cause PERMANENT DAMAGE to the ECA 60 pin connector. "Test Pin" as called out in «CIRCUIT TESTS»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__circuit-tests) refers to the pins on the breakout box. Once the breakout box has been installed during a test sequence, it may be left connected for the remainder of the test.
5. Vacuum gauge with 0-30 in. Hg range and resolution (unit on scale) of 1 in. Hg.
6. Tachometer with 0-6000 RPM range, accuracy F 40 RPM, and a resolution of 20 RPM.
7. Vacuum pump with 0-30 in. Hg range.
8. Timing light.
9. Spark tester. A modified spark plug with side electrode removed and alligator clip attached may be used.
10. Fuel Injection Pressure Gauge (Part No. T80L-9974-A).
11. Non-powered test lamp.
12. Jumper wire, about 15" long.
13. MAP/BP Tester. Unit plugs into MAP/BP sensor circuit and DVOM to check input and output voltages to verify correct sensor operation.

Note. STAR is available from Hikok Electrical Instrument Co., 10514 Dupont Ave., Cleveland, OH 44106.

TEST CONNECTOR LOCATIONS

On Bronco and pick-ups, the connector can be found on the right front wheelwell, below starter relay. Econoline vans have the connector located on right front fender apron, near starter relay.

READING SELF-TEST CODES

Service codes are transmitted to Pin No. 4 (Self-Test Output) of SELF-TEST connector in the form of timed pulses. All service codes are 2 digit numbers which are generated one digit at a time. Codes are shown as voltage pulses (needle sweeps) on an analog volt/ohmmeter (VOM).

If a VOM is being used, careful attention to the length of the pauses is necessary in order to read the codes correctly. There will be a 2 second pause between each DIGIT in a code. There will be a 4 second pause between each CODE. The continuous memory codes are separated from the functional test service codes by a 6 second delay, a single 1/2 second sweep, and another 6 second delay.

If a Self-Test Automatic Read-Out (STAR) tester is used, it will count the pulses and display them as a digital code. The STAR tester will add a zero (0) to single digit (Separator and Dynamic Response) codes.

Separator Pulse

A single 1/2 second separator pulse is issued 6-9 seconds after last functional KEY ON/ENGINE OFF SELF-TEST code. Then 6-9 seconds after the single 1/2 second separator pulse, the continuous memory codes will be displayed.

Continuous Memory Codes

These codes are issued as a result of information stored during CONTINUOUS MONITOR (WIGGLE) TEST . These codes are displayed only during KEY ON/ENGINE OFF SELF-TEST and after separator code. These codes should be used to diagnose ONLY when KEY ON/ENGINE OFF and KEY ON/ENGINE RUNNING SELF-TEST result in Code 11 and all QUICK TEST steps have been successfully completed.

QUICK TESTS

The QUICK TEST diagnostic procedure is a functional test of the EEC-IV system. It consist of 4 basic test steps. These basic steps must be carefully followed in sequence, otherwise misdiagnosis, or replacement of non-faulty components may result.

Perform QUICK TEST as follows: Perform PREPARATION and EQUIPMENT HOOK-UP steps, KEY ON/ENGINE OFF SELF-TEST , TIMING CHECK , KEY ON/ENGINE RUNNING SELF-TEST , and CONTINUOUS SELF-TEST . After all tests, servicing, or repairs have been completed, repeat QUICK TEST to ensure EEC-IV system works properly.

1. The «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) is a static check of EEC-IV system inputs and outputs. The «TIMING CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__timing-check) verifies the system's ability to compute and maintain a fixed spark timing during SELF-TEST.
2. The «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) is a dynamic system check with the engine under actual operating conditions and at normal operating temperature. The «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) checks the sensor inputs for opens and shorts while the vehicle is in operation.
3. The KOEO and KOER SELF-TESTS are intended to detect faults present at the time of testing, not intermittent faults. Intermittent faults are detected by «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) .

KEY ON/ENGINE OFF SELF-TEST

Note. Continuous memory codes recorded in this step will be used for diagnosis in CONTINUOUS SELF-TEST .

Code Output

Correct test results for system are dependent on the correct operation of several related non-EEC components and systems. It may be necessary to correct faults in these areas before EEC-IV will pass QUICK TEST .

Verify that vehicle has been properly prepared. See PREPARATION and EQUIPMENT HOOK-UP . Turn ignition on to start SELF-TEST. DO NOT depress throttle during test. Observe and record all service codes.

1. If engine does not start, go to «TEST A - NO START»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-a-no-start) , step 2). If «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) code and continuous memory indicate a pass (Code 11), go to «TIMING CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__timing-check) .
2. If any «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) code is displayed with continuous memory code 11, «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) indicates a fault. Record codes and go to «TEST RESULTS & ACTION TO TAKE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) in this test.
3. If any «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) or any continuous memory code is displayed, «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) and continuous memory indicate a fault. Record codes, but DO NOT repair continuous memory codes at this time. All «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) and «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) codes MUST be repaired first. Go to «TEST RESULTS & ACTION TO TAKE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) in this test.
4. If «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) code 11 displayed with ANY continuous memory code (except 15), continuous memory indicates a fault. Record codes, but DO NOT repair continuous memory codes at this time. «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) and «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) codes MUST be repaired first. Go to «TIMING CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__timing-check) .
5. If «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) code 11 is displayed and continuous memory code is 15, go to «TEST HH - NO CODES/CODES NOT LISTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-hh-no-codescodes-not) , step 9). If NO CODES are displayed, repeat SELF-TEST and verify that no service codes are present, then go to «TEST HH - NO CODES/CODES NOT LISTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-hh-no-codescodes-not) , step 1).

Test Results & Action To Take

1. Perform the test indicated in the «KEY ON/ENGINE OFF SELF-TEST MENU»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) table for that specific engine. Start with the first code displayed. If the tests refer you to other checks, perform them as instructed.
2. When more than one code is displayed, repair problems in the order that codes are displayed. Whenever a repair is made, repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If NO CODES appear, repeat SELF-TEST to verify that no service codes are present, and then go to «TEST HH - NO CODES/CODES NOT LISTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-hh-no-codescodes-not) , step 1).

Note. See CIRCUIT TESTS at back of article.

KEY ON/ENGINE OFF SELF-TEST MENU

TIMING CHECK

Note. If engine will not start, go to TEST A - NO START . If engine starts but stalls while testing, go to DIAGNOSIS BY SYMPTOM TEST.

1. Turn ignition off and wait 10 seconds. Verify that SELF-TEST has been activated. Restart engine and check timing while in SELF-TEST mode. You are allowed 2 minutes to check timing from the time the last code is displayed.
2. Correct SELF-TEST timing equals base ignition timing (10° BTDC on all engines) plus 17-23° BTDC. If timing is not 27-33° BTDC, go to «TEST GG - SPARK TIMING CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-gg-spark-timing-check) . If timing is 27-33° BTDC, go to «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) .

KEY ON/ENGINE RUNNING SELF-TEST

Note. If engine will not start, go to TEST A - NO START . If engine starts but stalls while testing, go to DIAGNOSIS BY SYMPTOM TEST.

1. Deactivate SELF-TEST (disconnect jumper wire). Start and run engine at 2000 RPM for 2 minutes to warm up EGO sensor. Turn engine off and wait 10 seconds. Insert jumper to activate SELF-TEST. DO NOT depress throttle during test unless a Dynamic Response code occurs.
2. Start engine. The engine ID code will be displayed.
3. Run test. If Dynamic Response code 1 (10 with STAR tester) occurs, briefly accelerate engine to wide open throttle (WOT). The «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) service codes will then be displayed. Observe and record all codes.

Note. The Engine ID code is 1/2 the number of cylinders (a 2 equals a 4 cylinder engine). STAR tester adds a zero to all single digit readings. A "20" on STAR tester equals a 4 cylinder engine. Some vehicles do not require a brief WOT, they will not display a 1 (10).

1. If NO CODES appear, repeat SELF-TEST and verify that no service codes are present, and then go to «TEST HH - NO CODES/CODES NOT LISTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-hh-no-codescodes-not) , step 1). If engine ID code is 2, 3 or 4 (20, 30 or 40 with STAR tester), and code 11 is displayed, «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) portion is okay. If symptom was of an intermittent nature, go to «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) . If symptom is present, go to «DIAGNOSIS BY SYMPTOM TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__diagnosis-by-symptom-test) . Otherwise «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) is complete, and EEC-IV system is okay.
2. If Engine ID code is 2, 3 or 4 (20, 30 or 40 with STAR tester), and any code other than 11 appears, «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) portion is at fault. Perform the test indicated in the «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) table for that specific engine.
3. Start with the first code displayed. If the tests refer you to other checks, perform them as instructed. When more than one code is displayed, repair problems in the order that codes are displayed. Whenever a repair is made repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

KEY ON/ENGINE RUNNING SELF-TEST MENU

CONTINUOUS SELF-TEST

Note. CONTINUOUS SELF-TEST is subdivided into 4 steps: CONTINUOUS MEMORY CODES, CLEARING CONTINUOUS MEMORY CODES, CONTINUOUS MEMORY CODES TO BE TESTED, and TEST RESULTS & ACTION TO TAKE. Perform steps in sequence.

1. To ensure proper diagnosis of continuous memory codes, «PREPARATION»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__preparation-for-testing) , «EQUIPMENT HOOK-UP»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__equipment-hook-up-scheme-70) , «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) , TIMING CHECK, and «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) must be successfully completed. If both «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) and «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) display code 11 (Pass), go to «CLEARING CONTINUOUS MEMORY CODES»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__clearing-continuous-memory-codes) .
2. If not, return to «PREPARATION»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__preparation-for-testing) step and make the necessary repairs indicated in «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) and «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) before going to «CLEARING CONTINUOUS MEMORY CODES»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__clearing-continuous-memory-codes) .

Clearing Continuous Memory Codes

1. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) . When the first service code appears, exit SELF-TEST program by disconnecting STAR tester or by removing jumper wire from Self-Test Input (STI) pigtail. Exiting «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) in this manner will clear all codes stored in continuous memory.
2. Repeat «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) . If code output is 11-10-11, go to «CONTINUOUS MEMORY CODES TO BE TESTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-memory-codes-to-be-tested) . If code output is not correct, check Self-Test Input (STI) circuit for short to ground. Repair short and repeat «CLEARING CONTINUOUS MEMORY CODES»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__clearing-continuous-memory-codes) step.

Continuous Memory Codes To Be Tested

Check list of Continuous Memory codes that were recorded in KEY ON/ENGINE OFF and KEY ON/ENGINE RUNNING SELF-TEST . Disregard any codes that have already been repaired. To confirm remaining codes, go to TEST RESULTS & ACTION TO TAKE .

1. Ensure that all previous «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) steps have been successfully completed. Verify proper test equipment hook-up. See «EQUIPMENT HOOK-UP»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__equipment-hook-up-scheme-70) in this article. Make sure that SELF-TEST is deactivated. DO NOT activate SELF-TEST unless specifically instructed to do so.
2. Using service codes obtained in «CONTINUOUS MEMORY CODES TO BE TESTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-memory-codes-to-be-tested) , perform the test(s) indicated in the «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) table for that specific engine. While performing «CIRCUIT TESTS»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__circuit-tests) , one or both of the «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) may have to be used to find intermittent fault.

CONTINUOUS MONITOR (WIGGLE) TEST

The Self-Test Output (STO) will be activated each time a fault is detected. If the STO is activated long enough during the wiggle tests a service code will be stored. A fault is indicated by a 10.5 volt or greater deflection on VOM. STAR tester LED turns off.

1. «KEY ON/ENGINE OFF»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) Test: With SELF-TEST deactivated, turn ignition on to enter into wiggle mode.
2. «KEY ON/ENGINE RUNNING»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) Test: Activate SELF-TEST and perform ENGINE RUNNING SELF-TEST. After service code output has finished, do not turn engine off or deactivate SELF-TEST. About 2 minutes after code 11 has been displayed, wiggle mode will start. The system will remain in wiggle mode until SELF -TEST is deactivated or engine is turned off.

Note. An alternate method of entering CONTINUOUS MONITOR (WIGGLE) TEST with engine running is to start ENGINE RUNNING SELF-TEST, exit, and re-enter KEY ON/ENGINE RUNNING SELF-TEST without turning engine off.

1. Observe VOM while moving, wiggling, and tapping the system harness (in short sections), connectors, and sensors. If an intermittent condition is created, the monitor will indicate this by storing a service code. Carefully inspect harness and associated connectors of affected circuits.
2. If an intermittent condition is not created, carefully disconnect sensor from harness. Remove terminals from connector and visually inspect terminals at both ends for corrosion, bad crimps, improperly seated terminals, etc.
3. Reconnect harness after inspection. Disconnect ECA from harness as carefully as possible. Remove and inspect terminals associated with sensor being checked.
4. If an intermittent condition cannot be created, reconnect connector and erase the «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) service codes. To erase service codes, activate «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) .
5. Remove jumper from Self-Test Input (STI) terminal as soon as first service code appears. Repeat SELF-TEST with jumper to verify that service codes have been erased. «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) is complete.

CONTINUOUS SELF-TEST CIRCUIT TEST MENU

Dynamic Response Check

The Dynamic Response Check verifies movement of the TPS and MAP sensors during wide open throttle (WOT) as part of the KEY ON/ENGINE RUNNING SELF-TEST. The signal to perform WOT is a single pulse (1) when using a VOM or code 10 on STAR tester. Briefly accelerate engine to WOT for one second.

Output State Check

The Output State Check is used as an aid in servicing output actuators associated with the EEC-IV system. It allows you to energize and de-energize most of the system output actuators on and off on command.

This mode is entered after all codes have been received from KEY ON/ENGINE OFF and CONTINUOUS SELF-TEST . At this time, leave SELF-TEST activated and depress throttle. Each time throttle is depressed, the output actuators will change state (go from on to off, or off to on).

DIAGNOSIS BY SYMPTOM TEST

The DIAGNOSIS BY SYMPTOM TEST is divided into specific engine sections. Each section will describe testing procedures and codes for that engine. Use appropriate DIAGNOSIS BY SYMPTOM TEST . The CIRCUIT TESTS are common to all engines, unless noted in test procedures.

Use this test procedure ONLY when directed to do so by results of QUICK TEST or steps in CIRCUIT TESTS . Follow test procedure carefully.

1. When engine stalls in operation, runs rough, misfires, or lacks power perform the following checks: Check for, and repair, any bad ground or power connections. Check ignition components (cap, rotor, wires, coil and plugs). Check basic engine components (valves, cam timing, compression, etc.). Check fuel delivery. Check EGR valve for correct function.
2. If detonation (engine knock) occurs and/or engine idles roughly, check EGR valve for correct function, then go to «TEST U - EGR ON/OFF CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-u-egr-onoff-check) , step 1).
3. If engine lacks fast idle with A/C on, go to «TEST M - NEUTRAL A/C SWITCH INPUT»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) , step 1) and/or «TEST Y - ISC (DC MOTOR)»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-y-isc-dc-motor) , step 1).
4. If gasoline fumes accumulate in engine compartment, go to «TEST W - CANISTER PURGE (CANP) CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-w-canister-purge-canp) , step 1) and/or evaporative emission control system.
5. If shift indicator light is always on or off, go to «TEST BB - SIL»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-bb-sil-shift-indicator) , step 1).
6. If RPM is erratic, check and adjust idle.

4.9L FBC EEC-IV Wiring Diagrams. Scheme 71

CIRCUIT TESTS

1. DO NOT perform any «CIRCUIT TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__circuit-tests) unless told to do so by «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . Make sure all non-EEC related faults are corrected. DO NOT replace any part unless directed to do so. When more than one service code is received, start with the first code displayed. NOTE: Procedures in the TESTING section of this article are not in absolute numerical order. Procedures not related to this engine have been removed to eliminate confusion.
2. DO NOT measure voltage or resistance at ECA or connect any test lamps to it, unless specified. All measurements are made by probing the REAR of the connector. Isolate both ends of a circuit and turn key off whenever checking for shorts or continuity, unless specified.
3. Disconnect solenoids and switches from harness before measuring continuity, resistance, or applying 12 volts. Follow each test step in order until fault is found. After each repair, check all component connections and repeat «CIRCUIT TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__circuit-tests) .
4. An "open" is defined as any resistance reading higher than 5 ohms, unless specified in «CIRCUIT TESTS»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__circuit-tests) . A "short" is defined as any resistance reading less than 10,000 ohms to ground, unless specified in «CIRCUIT TESTS»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__circuit-tests) .
5. On «TEST Q - FBC FUEL CONTROL»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-q-fbc-fuel-control) , to prevent replacement of good components, be aware that the following non-EEC related areas may also be at fault. These include: ignition coil, distributor cap and rotor, spark plug wires, fouled spark plugs, CNAP problems, carburetor and electric choke problems (if used), EGR valve and gasket, air filter, poor power and ground circuits, fuel pressure, intake and exhaust manifold leaks, engine not at normal operating temperature, and problems with PCV valves or fuel contaminated engine oil.

Note. Fuel contaminated engine oil may affect some service codes. If this is suspected, remove PCV valve from valve cover and repeat QUICK TEST . If problem is corrected, change engine oil and filter.

TEST A - NO START

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: fuel quantity and quality, ignition system damage, cracks, moisture, etc., engine mechanical conditions such as valves, timing belt, etc. Also included are starter and battery circuit problems.

1. Try to start engine. If engine does not crank, check vehicle starting and charging systems. If engine cranks, but does not start or else stalls after starting, go to next step.
2. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale and disconnect Throttle Position Sensor (TPS). Turn key on, leaving engine off. Measure voltage at TPS harness connector between voltage reference (VREF) and signal return. If reading is less than 4.0 volts or higher than 6.0 volts, go to «TEST C - REFERENCE VOLTAGE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-c-reference-voltage) . If reading is between 4.0 and 6.0 volts, reconnect TPS and go to next step.
3. Disconnect any spark plug wire and connect spark tester between plug wire and engine ground. Crank engine and check for spark. If spark exists, connect spark plug wire and go to Step 13). If no spark, connect spark plug wire and go to next step.
4. Remove high tension coil wire from distributor and install spark tester. Check for spark while cranking engine. If spark exists, connect coil wire and service or repair TFI ignition system. If there is no spark, connect coil wire and go to next step.
5. Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale and disconnect TFI. Measure resistance between test pin 16 and TFI harness connector ignition ground. If reading is more than 5 ohms, repair harness and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 5 ohms, go to next step.
6. With breakout box installed and box timing switch on "Distributor" position, connect TFI and ECA. Try to start vehicle. If vehicle starts, go to Step 10). If vehicle does not start, go to next step.
7. Move breakout box timing switch to "Computed" position. Set DVOM on 20-volt scale and measure voltage between test pin 36 and chassis ground while cranking engine. If reading is between 3.0 and 6.0 volts, EEC-IV system is NOT at fault. Diagnose TFI ignition system. If reading is less than 3.0 volts or more than 6.0 volts, go to next step.
8. Turn key off and wait 10 seconds. With breakout box installed, disconnect ECA and TFI. Set DVOM on 200,000-ohm scale and measure resistance between test pin 36 and test pins 16, 20, 26, 40, and 60 for short to ground. Measure resistance between test pin 36 and test pins 37 and 57 for short to power. Measure resistance between test pins 36 and 56 for short to PIP. If any reading is less than 10,000 ohms, repair short in harness and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If engine still does not start, go to next step. If all readings are 10,000 ohms or higher, go to next step.
9. Turn key off and wait 10 seconds. With breakout box installed, connect ECA, but leave TFI disconnected. Set DVOM on 200 ohm scale. Measure resistance between test pin 36 and test pins 37 and 57 for short to power. Measure resistance between test pin 36 and test pins 40 and 60 for short to ground. If any reading is less than 5 ohms, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If all readings are 5 ohms or higher, connect TFI and go to next step.
10. With breakout box installed and DVOM on 20-volt scale, measure voltage between test pin 56 and 16, while cranking engine. If reading is between 3.0 and 6.0 volts, remove breakout box. Replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 3.0 volts or more than 6.0 volts, go to next step.
11. Install breakout box, turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Disconnect TFI and ECA. Measure resistance between test pin 56 and TFI connector PIP circuit. If reading is 5 ohms or more, repair open PIP circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If readings is less than 5 ohms, go to next step.
12. With breakout box installed and ECA disconnected, turn key off. Disconnect TFI connector and set DVOM on 200,000-ohm scale. Measure resistance between test pin 56 and test pins 16, 20, 26, 40, and 60 for short to ground. Measure resistance between test pin 56 and test pins 37 and 57 for short to power. Measure resistance between test pin 56 and test pin 36 for short to Spark Output (SPOUT). If any reading is less than 10,000 ohms, repair PIP circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If all readings are higher than 10,000 ohms, diagnose TFI ignition system.
13. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for damaged, loose, or corroded pins or wires. Repair wiring as necessary. Install breakout box and connect ECA. Make sure that box timing switch is in "Computed" position. Set DVOM on 20 volt scale and measure voltage between test pin 36 and chassis ground while cranking engine. If reading is between 3.0 and 6.0 volts on 4.9L FBC engines, check carburetor. If reading is less than 3.0 volts or more than 6.0 volts, go to step 10).

TFI Module Circuits. Scheme 72

TEST B - VEHICLE BATTERY

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: battery cables and ground straps, voltage regulator and alternator, and ignition switch.

1. Turn key on, leaving engine off. Set DVOM on 20-volt scale and measure voltage across battery terminals. If reading is less than 10.5 volts, service or replace discharged battery. If reading is 10.5 volts or higher, go to next step.
2. Turn key on, leaving engine off. With ECA connected, set DVOM on 20-volt scale and measure voltage between battery negative post and signal return circuit in SELF-TEST connector. If reading is less than 0.5 volts, go to step 6). If reading is 0.5 volts or higher, go to next step.
3. With breakout box installed and ECA connected, turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between battery negative post and test pins 40 and 60. If either reading is 0.5 volts or higher, repair ground circuit having a resistance higher than 0.5 volts and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If both readings are less than 0.5 volts, go to next step.
4. With breakout box installed and ECA connected, turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Measure resistance between test pin 46 and test pins 40 and 60. If either reading is 5 ohms or higher, disconnect ECA connector and inspect for corrosion or damage. Repair wiring and recheck resistance. If reading is still too high, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If both readings are less than 5 ohms, go to next step.
5. With breakout box installed and ECA connected, turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Measure resistance between test pin 46 and signal return circuit at SELF-TEST connector. If reading is less than 5 ohms, system is okay, repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 5 ohms or higher, repair cause of excessive resistance in signal return circuit, then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
6. Turn key on, leaving engine off. With ECA connected, set DVOM on 20-volt scale. Measure voltage between battery negative post and Keep Alive Power (KAPWR) circuit at EEC power relay. If reading is less than 10.5 volts, check KAPWR and vehicle power (V Power) circuits for shorts to ground. Also check KAPWR circuit from EEC power relay to battery positive post for open circuit. If reading is 10.5 volts or higher, go to next step.
7. Turn key on, leaving engine off. With ECA connected, set DVOM on 20-volt scale. Measure voltage between battery negative post and ignition circuit at EEC power relay. If readings is less than 10.5 volts, check for open ignition switch circuits. Repair wiring and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10.5 volts or higher, go to next step.
8. Turn key on, leaving engine off. With ECA connected, set DVOM on 20-volt scale. Measure voltage between battery negative post and ground circuit at EEC power relay. If reading is 0.5 volts or higher, repair open circuit or short to ground in ground circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If you entered this test for a code 78 and if reading is less than 0.5 volts, go to step 10). If you entered this test for any other code and if reading is less than 0.5 volts, go to next step.
9. Turn key on, leaving engine off. With ECA connected, set DVOM on 20-volt scale. Measure voltage between battery negative post and vehicle power circuit at EEC power relay. If reading is less than 10.5 volts, replace EEC power relay and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10.5 volts or higher, repair short to ground or open in vehicle power circuit from EEC power relay to test pins 37 and 57. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
10. Turn key on, leaving engine off. Connect VOM or STAR tester to SELF-TEST connector. With SELF-TEST deactivated, enter into «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) . Observe VOM or STAR tester LED for indication of fault while bending and twisting harness from EEC power relay to ECA. If code 78 is displayed or if fault is indicated, isolate fault in vehicle power circuit, and repair as necessary. If code 78 is not displayed or if fault is not indicated, inspect EEC power relay and connectors for damaged pins, corrosion, etc. If okay, replace EEC power relay and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

Battery Circuits. Scheme 73

TEST C - REFERENCE VOLTAGE

1. Install breakout box, leaving ECA connected. Turn key on, leaving engine off. Set DVOM on 20-volt scale and measure voltage between test pin 37 and signal return in SELF-TEST connector. If reading is less than 10.5 volts, go to «TEST B - VEHICLE BATTERY»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-b-vehicle-battery) , step 1). If reading is 10.5 volts or higher, go to next step.
2. With breakout box installed and ECA connected, turn key on, leaving engine off. Set DVOM on 20-volt scale and measure voltage between test pins 26 and 46. If reading is 6.0 volts or higher, go to step 4). If reading is 4.0 volts or lower, go to step 5). If reading is between 4.0 and 6.0 volts, go to next step.
3. With breakout box installed and ECA disconnected, turn key off. Set DVOM on 200-ohm scale. Measure resistance from test pins 26 and 46 to suspect VREF sensor harness connector. If all readings are less than 5 ohms, connect sensors. VREF circuit is okay, repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If any reading is 5 ohms or higher, repair open circuit in VREF or signal return and then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
4. Turn key off and wait 10 seconds. With breakout box installed and ECA disconnected, turn key on, leaving engine off. Set DVOM on 20-volt scale and measure voltage between test pin 26 and battery ground. If reading is less than 0.5 volts, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 0.5 volts or higher, repair short to battery power in EEC-IV harness. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . Replace ECA if fault still occurs.
5. Shorted TPS Sensor. Turn key off and wait for 10 seconds. With breakout box installed and ECA connected, disconnect Throttle Position Sensor (TPS) from vehicle harness. Turn key on, leaving engine off. Set DVOM on 20-volt scale and measure voltage between test pin 26 and 46. If reading is 4.0 volts or higher, replace TPS and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If less than 4.0 volts, go to next step.
6. Shorted MAP/BP Sensor. Turn key off and wait 10 seconds. With breakout box installed and ECA connected, disconnect MAP/BP sensor. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between test pin 26 and 46. If reading is 4.0 volts or higher, replace MAP/BP sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 4.0 volts, go to next step.
7. With breakout box installed and ECA disconnected, turn key off and wait 10 seconds. Disconnect TPS, MAP/BP, and EVP sensor. Set DVOM on 200-ohm scale. Measure resistance between test pin 26 and test pins 20, 40, 46, and 60. If reading is less than 5 ohms, repair short to ground, connect all sensors and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If original problem still occurs, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 5 ohms or higher, connect sensors, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

Reference Voltage Circuits. Scheme 74

TEST F - COOLANT TEMPERATURE SENSOR

Note. For purposes of this test, a "warmed up" engine has a coolant temperature of 50-240°F (10-116°C) for KEY ON/ENGINE OFF SELF-TEST and 180-240°F (82-116°C) for KEY ON/ENGINE RUNNING SELF-TEST. The test procedure will be invalid outside these ranges.

COOLANT TEMP (ECT) SENS RESISTANCE

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: Coolant or oil level. Blocked or obstructed air flow. Engine not at normal operating temperature. Cooling fan.

1. Code 21 Displayed. Start and run engine at 2000 RPM for 2 minutes. Check that upper radiator hose is hot and pressurized. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) before continuing. If vehicle stalls, DO NOT service code 21 at this time, go directly to «DIAGNOSIS BY SYMPTOM TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__diagnosis-by-symptom-test) . If code 21 is not displayed, service other codes as necessary (if displayed). If code 21 appears, go to next step.
2. Turn key off and wait 10 seconds. Disconnect TPS. Set DVOM on 20-volt scale. Turn key on, leaving engine off. Measure voltage at TPS harness connector between VREF and signal return. If voltage is less than 4.0 volts or higher than 6.0 volts, go to «TEST C - REFERENCE VOLTAGE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-c-reference-voltage) , step 1). If voltage is between 4 and 6 volts, reconnect TPS and go to next step.
3. Make sure engine is fully warmed up for this step. Turn key off and wait 10 seconds. Disconnect wiring harness at ECT sensor. Set DVOM on 200,000-ohm scale and measure resistance of ECT sensor. If reading is 1300-7700 ohms at engine coolant temperature of 240-140°F (116-60°C) with engine off and 1550-4550 ohms at 230-180°F (110-82°C) with engine running, replace ECA, connect ECT sensor, then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If readings are not correct for coolant temperature, replace ECT sensor, connect harness, and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
4. Code 51 Displayed. Turn key off and wait 10 seconds. Disconnect ECT sensor at wiring harness and inspect wiring for damage or corrosion. Connect a jumper wire between ECT signal and signal return terminals in sensor harness connector. Repeat «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) . If code 61 is displayed, replace ECT sensor and remove jumper wire. Connect harness to ECT sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If code 61 is not displayed, go to next step.
5. Turn key off and wait 10 seconds. With harness disconnected at ECT sensor and jumper removed from harness connector, disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between ECT signal at ECT connector and test pin 7. Measure resistance between signal return at ECT connector and test pin 46. If both readings are less than 5 ohms, replace ECA. Remove breakout box and connect ECA and ECT sensor. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If either reading is 5 ohms or higher, repair open circuits. Remove breakout box, connect ECA and ECT sensor. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
6. Code 61 Displayed. Turn key off and wait 10 seconds. Disconnect ECT sensor and inspect connector for damage or corrosion. Repair wiring and repeat «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) . If code 51 is displayed, replace ECT sensor, connect sensor, then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If code 51 is not displayed, go to next step.
7. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale. Disconnect TPS. Turn key on, leaving engine off. Measure voltage between VREF and signal return at TPS connector. If reading is less than 4.0 volts or higher than 6.0 volts, go to «TEST C - REFERENCE VOLTAGE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-c-reference-voltage) , step 1). If voltage is between 4.0 and 6.0 volts, connect TPS and go to next step.
8. Turn key off and wait 10 seconds. Disconnect harness from ECT sensor. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 7 and test pins 40, 46, and 60. If any reading is less than 10,000 ohms, repair short circuits. Remove breakout box, connect ECA and ECT sensor, then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If all readings are 10,000 ohms or higher, replace ECA. Remove breakout box, connect ECA and ECT sensor. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
9. Continuous Code 21 Displayed. Turn key off and wait 10 seconds. Disconnect all SELF-TEST equipment and prepare vehicle for test drive. While driving vehicle, attempt to copy driving style in which complaint was noticed. If problem occurs, try to maintain condition for 1 or more minutes. After road test, repeat «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) . If code 21 is present in «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) , make sure that thermostat is working properly. If thermostat functions properly, replace ECT sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If code 21 is not displayed, fault cannot be duplicated at this time. Continuous code 21 testing is complete.
10. Continuous Code 51 or 61 Displayed. Using «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , observe VOM or STAR tester LED while tapping ECT sensor and wiggling ECT connector. If fault is indicated, disconnect and inspect ECT connector and terminals. If connector and terminals are okay, replace ECT sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If no fault is indicated, go to next step.
11. While in «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , observe VOM or STAR tester LED for fault as you bend, shake or wiggle EEC-IV harness. Start at sensor connector and work toward firewall. Also test harness from firewall to ECA in same manner. If fault is indicated, isolate fault in wiring and repair as necessary. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If fault is not indicated, go to next step.
12. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connector and terminals for obvious damage. If connector and terminals are damaged, repair as necessary and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If connector and terminals are okay, fault cannot be duplicated at this time. Continuous code 51 or 61 testing is complete.

Engine Coolant Temperature (ECT) Sensor Circuit. Scheme 75

TEST G - MAP/BP SENSOR

Note. Barometric pressure sensor output is digital and must be measured with MAP/BP tester.

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: Unusually high/low atmospheric barometer reading. Kinked or blocked vacuum lines. Engine condition (valves, vacuum leaks, valve timing, EGR valve, etc.).

Scheme 76

1. Code 22 Displayed, Engine Off. Turn key off. Disconnect MAP/BP sensor from harness. Connect MAP/BP tester between wiring harness and MAP/BP sensor. Connect banana plugs of tester into DVOM and set DVOM on 20-volt scale. (Scheme 70) Go to next step. (Scheme 76): Correct Hookup For MAP/BP Tester
2. With MAP/BP tester connected, turn key on. If only Green light on tester is lit, VREF is correct. Go to step 4). If "less than 4 volts" Red light or no lights come on, VREF is too low. If "more than 6 volts" Red light comes on, VREF is too high. If VREF is too high or too low, go to next step.
3. With MAP/BP tester connected, turn key on. Disconnect MAP/BP sensor and repeat step 2). If only Green light comes on, VREF is correct. Replace MAP/BP sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If "less than 4 volts" Red light or no lights come on, VREF is too low. If "more than 6 volts" Red light comes on, VREF is too high. If VREF is too high or too low, remove MAP/BP tester, connect sensor, then go to «TEST C - REFERENCE VOLTAGE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-c-reference-voltage), step 1).
4. With MAP/BP tester connected and key on, measure sensor output voltage. If voltage output is in correct range for altitude of vehicle being tested, go to next step. If output reading is outside range, go to step 6). NOTE: Measure several known good MAP/BP sensors on available vehicles. Mean voltage reading will be typical for your location on date of testing. MAP VOLTAGE OUTPUT Elevation (Ft.) Voltage Output (Volts) 0 1.55-1.63 1000 1.52-1.60 2000 1.49-1.57 3000 1.46-1.54 4000 1.43-1.51 5000 1.40-1.48 6000 1.37-1.45 7000 1.35-1.43
5. Turn key off and wait 10 seconds. Disconnect MAP/BP sensor from harness. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between MAP/BP signal at sensor connector and test pin 45. If reading is less than 5 ohms, replace ECA. Connect ECA and MAP/BP sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If reading is 5 ohms or higher, repair opens in wiring. Remove breakout box, connect ECA and MAP/BP sensor. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).
6. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Disconnect harness at MAP/BP sensor. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 45 and test pins 26, 46, 40, and 60. If any reading is less than 10,000 ohms, repair shorts in wiring. Remove breakout box and connect ECA and MAP/BP sensor. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If all readings are 10,000 ohms or higher, replace MAP/BP sensor. Remove breakout box and connect all wiring. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).
7. Code 22 Displayed, Engine Running. Turn key off and wait 10 seconds. Disconnect vacuum line from MAP sensor. Hook vacuum pump to MAP sensor and apply 18 in. Hg. vacuum to sensor. If sensor does not hold vacuum, replace MAP sensor, connect vacuum line and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If MAP sensor does hold vacuum, go to next step.
8. Turn key off and wait 10 seconds. Plug vacuum supply hose to MAP sensor. Start engine and hold in 1400-1600 RPM range. Slowly apply 15 in. Hg vacuum to MAP sensor. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) while holding RPM range. Ignore all other codes at this time. If code 22 is still displayed, replace MAP sensor. Connect vacuum hose and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If code 22 is not displayed, check vacuum hose to sensor and repair. If hose is good, service other codes as necessary, then check engine for low vacuum condition. NOTE: Use «DYNAMIC RESPONSE CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__dynamic-response-check) as specified in step 9). For additional information see «QUICK TEST DIAGNOSTIC AIDS»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing), «DYNAMIC RESPONSE CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__dynamic-response-check) in front of this article.
9. Code 72 Displayed. Turn key off and wait 10 seconds. Install vacuum gauge with "T" in manifold vacuum line at MAP sensor. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) and observe vacuum reading before and during «DYNAMIC RESPONSE CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__dynamic-response-check) portion of test. Record service codes. If vacuum decreased 10 in. Hg or more and code 72 is not displayed, disconnect vacuum gauge and service other codes as necessary. If vacuum decreased 10 in. Hg and code 72 is displayed, replace MAP sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If vacuum decreased less than 10 in. Hg, go to next step.
10. Check vacuum lines for correct routing, using vehicle emissions decal as a guide. Also check MAP sensor vacuum lines for kinks or blockage. If lines are good, EEC-IV system is okay. Check engine for cause of low vacuum. If vacuum lines are bad, repair as necessary and repeat step 9).
11. Turn key off. Disconnect MAP/BP sensor from harness. Connect MAP/BP tester between wiring harness and MAP/BP sensor. Connect banana plugs of tester into DVOM and set DVOM on 20-volt scale. (Scheme 70) Go to next step.
12. Turn key on and measure sensor output. Compare values to MAP VOLTAGE OUTPUT table. If reading is out of range, replace MAP/BP sensor. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If reading is within range, go to next step.
13. Check MAP sensor vacuum lines for leaks, bad connections, kinks or blockage. If vacuum lines are okay, go to «DIAGNOSIS BY SYMPTOM TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__diagnosis-by-symptom-test). If vacuum lines are bad, repair as necessary and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).
14. Continuous Code 22 Displayed. Using «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test), observe VOM or STAR tester LED for indication of fault while doing the following: connect vacuum pump to MAP sensor and slowly apply 25 in. Hg. Bleed vacuum slowly, tap MAP sensor lightly, and wiggle MAP connector. If fault is indicated, disconnect sensor. Inspect connector and terminals for damage. If connector and terminals are okay, replace MAP sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If no fault is indicated, go to next step.
15. Stay in «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test). Observe VOM or STAR tester LED for indication of fault while shaking, bending or wiggling small sections of harness from sensor connector to firewall. Check harness from firewall to ECA in same manner. If fault is indicated, isolate fault in harness and repair as necessary. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If no fault is indicated, go to next step.
16. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connector and terminals for obvious damage. If connector and terminals are damaged, repair as necessary. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If connector and terminals are okay, fault cannot be duplicated at this time. Continuous code 22 testing is complete.

MAP/BP Sensor Circuit. Scheme 77

TEST I - THROTTLE POSITION SENSOR (TPS)

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: idle speed/throttle stop adjustment, binding throttle shaft/linkage or cruise control linkage, or choke/high cam system, if equipped.

1. Code 23 Displayed. If «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) code 68 or «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) codes 31, 41, or 58 are displayed, service these codes first. If these codes have been serviced or are not displayed, go to next step.
2. Inspect carburetor/throttle body and linkage for mechanical binding or sticking. Make sure linkage is set with throttle in closed position. If throttle plate or linkage is binding, check for binding throttle or cruise control linkage, vacuum line or harness interference, etc. Repair problem(s) and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If no mechanical problem is found, go to next step.
3. Turn key off and wait 10 seconds. Disconnect TPS from harness at throttle body. Inspect for and repair any damaged wiring. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) . Check for code 63. Ignore all other codes at this time. If code 63 is not displayed, go to step 5). If code 63 is displayed, go to next step.
4. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale and disconnect TPS from harness. Inspect for and repair any damaged wiring. Turn key on, leaving engine off. Measure voltage at TPS connector between VREF and signal return. If reading is less than 4.0 volts or higher than 6.0 volts, go to «TEST C - REFERENCE VOLTAGE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-c-reference-voltage) , step 1). If reading is between 4.0 and 6.0 volts, replace TPS and «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
5. Turn key off and wait 10 seconds. Disconnect TPS from harness. Set DVOM on 200,000-ohm scale. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Measure resistance between test pin 47 and test pins 26 and 57. If either reading is less than 10,000 ohms, repair short in harness and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If both readings are 10,000 ohms or higher, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
6. Code 63 Displayed. Turn key off and wait 10 seconds. Disconnect TPS from harness. Install a jumper wire between VREF and TPS signal at connector. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) . Check for codes 53 or 23. Ignore all other codes at this time. If no codes are displayed, immediately remove jumper wire, and go to step 9). If either code 53 or 23 are displayed, replace TPS and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If neither code 53 or 23 are displayed, go to next step.
7. Turn key off and wait 10 seconds. Disconnect TPS from harness. Inspect for and repair any damaged wiring. Set DVOM on 20 volt scale. Turn key on, leaving engine off. Measure voltage between VREF and signal return at TPS connector. If reading is less than 4.0 volts or more than 6.0 volts, go to «TEST C - REFERENCE VOLTAGE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-c-reference-voltage) , step 1). If reading is between 4.0 and 6.0 volts, go to next step.
8. Turn key off and wait 10 seconds. Leave TPS disconnected. Set DVOM on 200-ohm scale and disconnect ECA 60-pin connector. Inspect for any repair any damaged wiring. Install breakout box and connect ECA. Measure resistance between TPS signal at connector and test pin 47. If reading is 5 ohms or more, repair faulty circuit. Remove breakout box, connect ECA and TPS, and then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 5 ohms, go to next step.
9. Turn key off and wait 10 seconds. Leave TPS disconnected. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box and set DVOM on 200,000-ohm scale. Measure resistance at connector between TPS signal and ground, and between TPS signal and test pin 46. If either reading is less than 10,000 ohms repair short circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If both readings are 10,000 ohms or more, replace ECA. Remove breakout box, connect TPS, and then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . NOTE: Code 73 in step 10) indicates that TPS did not exceed 25% of its rotation during DYNAMIC RESPONSE CHECK. For additional information see «QUICK TEST DIAGNOSTIC AIDS»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) , «DYNAMIC RESPONSE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__dynamic-response-check) CHECK in front of this article.
10. Code 73 Displayed. Turn key off. Install breakout box and set DVOM on 20-volt scale. Connect DVOM to test pins 46 and 47. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . Verify that DVOM reading exceeds 3.5 volts during WOT of «DYNAMIC RESPONSE CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__dynamic-response-check) . If reading exceeds 3.5 volts, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading does not exceed 3.5 volts, make sure that TPS is correctly installed and adjusted. If okay, replace TPS and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
11. Continuous Code 53 Displayed. Using «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , observe VOM or STAR tester LED for indication of fault while slowly opening throttle to WOT. Slowly bring throttle to closed position and lightly tap TPS and wiggle connector. If no fault is indicated, go to step 13). If fault is indicated, go to next step.
12. Turn key off and wait 10 wait seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA connected. Stay in «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) and connect DVOM between test pin 47 and 46. Set DVOM on 20-volt scale. Turn key on, leaving engine off. Observe DVOM and repeat step 11). If fault occurs below 4.25 volts, inspect TPS connectors and terminals. If okay, replace TPS and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If fault does not occur below 4.25 volts, TPS over-travel may have caused continuous code 53. TPS is good, go to next step to check harness.
13. While in «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , shake, bend and wiggle small sections of EEC-IV harness from TPS sensor to firewall, and from firewall to ECA. If fault is indicated, isolate fault in wiring and repair as necessary. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If no fault is indicated, go to next step.
14. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connector and terminals for obvious damage. If connector and terminals are damaged, repair as necessary. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If connector and terminals are okay, fault cannot be duplicated at this time. Continuous code 53 testing is complete.
15. Continuous Code 63 Displayed. Using «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , observe VOM or STAR tester LED for indication of fault while slowly opening throttle to WOT. Slowly bring throttle to closed position and lightly tap TPS and wiggle connector. If fault is indicated, disconnect TPS. Inspect connectors and terminals. If connectors and terminals are okay, replace TPS and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If no fault is indicated, go to next step.
16. While in «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , shake, bend and wiggle small sections of EEC-IV harness from TPS sensor to firewall, and from firewall to ECA. If fault is indicated, isolate fault in wiring and repair as necessary. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If no fault is indicated, go to next step.
17. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connector and terminals for obvious damage. If connector and terminals are damaged, repair as necessary. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If connector and terminals are okay, fault cannot be duplicated at this time. Continuous code 63 testing is complete.

Throttle Position Sensor (TPS) Circuit. Scheme 78

Scheme 79

1. Code 67 Displayed. When this code is displayed, determine which engine and system is being tested and proceed to correct step as listed. For 4.9L FBC models with Man. Trans., go to step 7). For 4.9L FBC models with Auto.Trans., go to next step.
2. Turn key off and wait 10 seconds. Make sure heater control is in "OFF" position and that transmission is in Neutral or Park. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box and connect ECA. Turn key on, leaving engine off. Set DVOM on 20-volt scale and measure voltage between test pin 30 and chassis ground. If reading is less than 1.0 volt, go to step 4). If reading is 1.0 volt or higher, go to next step.
3. Turn key off and wait 10 seconds. Leave breakout box installed and ECA connected. Locate neutral drive switch and disconnect harness at switch. Set DVOM on 200-ohm scale and measure resistance across switch. If reading is less than 5 ohms, repair open in neutral drive switch circuit. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If reading is 5 ohms or more, replace neutral drive switch and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).
4. Install breakout box and connect ECA. Turn key on, leaving engine off. Set DVOM on 20-volt scale, and turn A/C control switch off. Measure voltage between test pin 10 and chassis ground. If reading is 1.0 volt or more, repair short to power in A/C clutch circuit. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If reading is less than 1.0 volt, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). (Scheme 79): Neutral Drive-A/C Input Circuit (A/T Models)
5. Turn key off and wait 10 seconds. Make sure that A/C is off, if equipped. Ensure that transmission is in Neutral and that clutch is released. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box and connect ECA. With DVOM on 200-ohm scale, measure resistance between test pins 30 and 46. If reading is less than 5 ohms, go to step 4). If reading is 5 ohms or more, go to next step.
6. Turn key off. With breakout box and ECA connected, set DVOM on 200-ohm scale. Locate neutral switch (on transmission) and clutch switch (under dash). Disconnect wiring harness from both switches. Measure resistance across each switch. If reading at both switches is less than 5 ohms, go to step 4). If reading at either or both switches is 5 ohms or more, replace defective switch(es). Connect harness and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).
7. Turn key off and wait 10 seconds. Verify that A/C switch is off, if equipped. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box and connect ECA. Set DVOM on 20-volt scale. Measure resistance between test pin 30 and neutral input circuit at SELF-TEST connector. If reading is less than 5 ohms, go to step 4). If reading is ohms or more, repair open in neutral input circuit. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).

Neutral Drive-A/C Input Circuit (Man. Trans. Models). Scheme 80

TEST N - KEY POWER CHECK

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: Charging system overcharging. Battery charger connected with engine running. Jump starting vehicle.

1. Turn key off and wait 10 seconds. Install breakout box and connect ECA. Set DVOM on 20-volt scale and connect to test pins 5 and 60. During «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) , observe DVOM and record codes. If reading is above 17.5 volts, repair charging system for overcharging condition. If reading is below 17.5 volts and code 65 is displayed, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is below 17.5 volts and code 65 is not displayed, go to next step.
2. Continuous Code 65 Displayed. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) and record service codes. If continuous code 65 is displayed, check charging system for intermittent overcharging condition (above 17.5 volts). If code 65 is not displayed, fault cannot be duplicated at this time. Continuous code 65 testing is complete.
3. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box and connect ECA. Set DVOM on 20-volt scale. Measure voltage between test pin 5 and 60, and perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . If reading is above 7.5 volts and code 55 is displayed, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is above 7.5 volts and code 55 is not displayed, go to step 5). If reading drops below 7.5 volts, go to next step.
4. Turn key off. With breakout box installed and ECA connected, set DVOM on 200-ohm scale. Measure resistance between test pin 5 and key power terminal on EEC power relay. If reading is 5 ohms or less, check charging system for undercharging condition. If reading is more than 5 ohms, repair open in key power circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
5. Continuous Code 55 Displayed. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) and record service codes. If continuous code 55 is displayed, check charging system for intermittent overcharging condition (above 17.5 volts). If code 55 is not displayed, fault cannot be duplicated at this time. Continuous code 55 testing is complete.

Key Power Circuit. Scheme 81

TEST Q - FBC FUEL CONTROL

Note. See CIRCUIT TESTS before performing this test.

1. Code 41 Displayed. If engine ran for more than 2 minutes before performing «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) , go to next step. If engine did not run for more than 2 minutes, prepare vehicle and repeat «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) .
2. Turn key off. Connect ECA and EGO sensor. Disconnect thermactor air supply hose at air pump and cap hose. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . If code 11 or 42 is present, treat as code 44. Return to «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) and service code(s) as necessary. If code 44 is present, return «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) and service code as necessary. If code 41 is present, leave thermactor hose disconnected and go to next step.
3. Turn key off and wait 10 seconds. With thermactor hose disconnected, disconnect harness at Feedback Control (FBC) solenoid. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . Check for code 41. Ignore all other codes at this time. If code 41 is not displayed, go to step 5). If code 41 is displayed, go to next step.
4. Turn key off and wait 10 seconds. With FBC solenoid and thermactor hose disconnected, start and run engine at part throttle for 2 minutes. Turn key off and wait 10 seconds. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) while holding choke 3/4 closed. DO NOT stall engine. If code 41 is displayed, connect all components and go to step 6). If code 41 is not displayed, replace FBC solenoid and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If code 41 is still present, service carburetor.
5. Turn key off and wait 10 seconds. Connect thermactor air hose. Leave FBC solenoid disconnected. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. With DVOM on 200,000-ohm scale, measure resistance from test pin 58 to pins 20, 40 and 46. If any reading is less than 10,000 ohms, repair short circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If all readings are 10,000 ohms or more, replace ECA. Connect all components and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
6. Turn key off. With EGO sensor disconnected, start and run engine for 2 minutes. Set DVOM on 20-volt scale. With engine running, hold choke 3/4 closed. DO NOT stall engine. Measure voltage between EGO sensor pigtail and battery negative terminal. If reading is less than 0.45 volts, replace EGO sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 0.45 volts or more, go to next step.
7. Turn key off and wait 10 seconds. Disconnect EGO sensor. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. With DVOM on 200-ohm scale, measure resistance between test pin 29 and EGO circuit at EGO sensor connector. Measure resistance between test pin 49 and pins 40 and 60. If any reading is 5 ohms or more, repair open circuit. Remove breakout box, connect ECA and EGO sensor, then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If all readings are less than 5 ohms, go to next step.
8. Turn key off and wait 10 seconds. With thermactor and FBC solenoid connected, disconnect harness at EGO sensor. With DVOM on 200,000-ohm scale, measure resistance between negative battery terminal and EGO circuit at EGO sensor connector. If reading is less than 10,000 ohms, repair short circuit. Remove breakout box, connect ECA and EGO sensor, then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10,000 ohms or more, replace ECA. Connect ECA and EGO sensor, then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
9. Codes 42 & 47 Displayed. If choke assembly binds or sticks, service choke assembly and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If choke functions properly without sticking or binding, go to next step.
10. Start and run engine at part throttle for 2 minutes. Turn key off and wait 10 seconds. Disconnect harness at EGO sensor. Install a jumper wire and connect harness EGO circuit to ground. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . Check for code 41. Ignore all other codes at this time. If code 41 is not displayed, go to step 16). If code 41 is displayed, go to next step.
11. Turn key off and wait 10 seconds. Disconnect a 7/32" vacuum hose to create a vacuum leak. Set DVOM on 20-volt scale. Disconnect EGO sensor from harness and connect DVOM from EGO sensor to engine ground. Run engine at 2000 RPM for 2 minutes while observing DVOM. If reading is more than 0.4 volts, replace EGO sensor, connect vacuum hose, and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 0.4 volts, EGO sensor is okay. Go to next step.
12. Turn key off and wait 10 seconds. Connect 7/32" vacuum hose. Disconnect FBC solenoid and set DVOM on 200-ohm scale. Measure FBC solenoid resistance. If resistance is 15 to 30 ohms on 2150 carburetor or 30 to 60 ohms on YFA carburetor, connect FBC solenoid and go to next step. If resistance is incorrect, replace FBC solenoid and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
13. Turn key off and wait 10 seconds. Deactivate «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) and disconnect harness at FBC solenoid. Set DVOM on 20-volt scale. Turn ignition on, leaving engine off. Measure voltage between negative battery terminal and VPWR at FBC solenoid connector. If reading is less than 10 volts, connect FBC solenoid, repair open circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10 volts or more, go to next step.
14. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. With DVOM on 200,000-ohm scale, and FBC solenoid disconnected, measure resistance between test pin 58 and 37. If reading is less than 10,000 ohms, repair short circuit to power and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10,000 ohms or more, go to next step.
15. Turn key off and wait 10 seconds. Leave FBC solenoid disconnected. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. With DVOM on 200-ohm scale, measure resistance between test pin 58 and FBC circuit at harness connector. If reading is less than 5 ohms, replace ECA. Remove breakout box, connect ECA and FBC solenoid, then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 5 ohms or more, repair open circuit. Remove breakout box, connect ECA and FBC solenoid, then repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
16. Turn key off and wait 10 seconds. Disconnect vacuum hose between canister purge solenoid and canister, plug both ends. Repeat «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . If code 42 is not displayed, go to CIRCUIT TEST W, step 1). If code 42 is displayed, go to next step.
17. Turn key off and wait 10 seconds. Install breakout box. Measure resistance between test pin 49 and EGO sensor ground at engine block. Measure resistance between test pin 29 and EGO sensor harness connector. If both readings are less than 5 ohms, disconnect ECA and check connector for damage or corrosion. If there is no damage or corrosion, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If resistance is higher than 5 ohms, repair circuit having a resistance greater than 5 ohms and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
18. Code 43 Displayed. Start and run engine at 2000 RPM for 2 minutes. Turn key off and wait 10 seconds. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . If code 43 is not displayed, service other codes as necessary. If code 43 is displayed, go to next step.
19. If there are any exhaust leaks at manifold or inlet pipe, repair as necessary and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If there are no leaks present, go to next step.
20. Start engine and allow to idle. If idle quality weakens and remains poor during and after «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) , service carburetor. If idle quality is stable, replace EGO sensor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

FBC Fuel Control Circuits. Scheme 82

TEST T - INERTIA SWITCH

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: fuel lines, fuel filters, throttle body, fuel pump or contaminated fuel.

1. Install fuel pressure gauge. Check if fuel pump runs. Cycle key from off to on several times. DO NOT crank engine. Pump should operate each time key is on. If pump runs as indicated, check electric fuel pump system for problems. If pump does not run as indicated, go to next step.
2. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box and connect ECA. Turn key on, leaving engine off. Set DVOM on 20 volt scale. Measure voltage between test pin 37 and 40, and between test pin 57 and 60. If either reading is less than 10.5 volts, go to «TEST B - VEHICLE BATTERY»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-b-vehicle-battery) , step 1). If both readings are 10.5 volts or more, go to next step.
3. Turn key off and wait 10 seconds. Leave breakout box installed and ECA connected. Locate and disconnect fuel pump inertia switch. Set DVOM on 200-ohm scale and measure switch resistance. If reading is 5 ohms or more, replace inertia switch and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 5 ohms, go to next step.
4. Turn key on, leaving engine off. Leave breakout box installed and ECA connected. Locate fuel pump(s). Set DVOM on 20-volt scale. Measure voltage between chassis ground and power-to-pump(s) circuit at fuel pump(s) while cranking. If reading is 8 volts or more, service electric fuel pump(s). If reading is less than 8 volts, repair open in power-to-pump(s) circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

Fuel Pump (Inertia Switch) Circuits. Scheme 83

TEST U - EGR ON/OFF CHECK

Note. Code 34 may be result of high volume exhaust vent system reducing backpressure. If this is suspected, perform test in well-ventilated area without exhaust vent connected.

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: air or vacuum leaks, EGR flow restrictions or EGR value.

1. Code 34 Displayed. Use only VOM/DVOM, not STAR tester, for this step. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale. Connect negative DVOM lead to STO at SELF-TEST connector and positive lead to positive battery terminal. Insert jumper wire between STI and signal return circuit at SELF-TEST connector. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) until end of «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) codes (DVOM reads zero volts). Depress and release throttle and observe DVOM reading. If DVOM did not show high voltage, depress throttle to WOT and release. If output voltage does not go too high, go to «TEST HH - NO CODES/CODES NOT LISTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-hh-no-codescodes-not) , step 15). Leave test equipment hooked up. If DVOM registered high reading, stay in «OUTPUT STATE CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__output-state-check) and go to next step.
2. Set DVOM on 20-volt scale. Connect DVOM positive lead to VPWR circuit at EGR solenoid and negative lead to EGR output circuit. Depress and release throttle several times to cycle EGR solenoid output on and off. If output does not cycle on and off, remove jumper wire and go to step 5). If output cycles on and off, go to next step.
3. Connect vacuum pump to solenoid vacuum supply port and vacuum gauge to output port of solenoid. Apply minimum vacuum of 6 in. Hg. Depress and release throttle several times to cycle EGR solenoid output while maintaining vacuum at supply port. Note gauge reading. If vacuum output does not cycle, replace EGR solenoid and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If vacuum output cycles, go to next step.
4. With vacuum lines disconnected at EGR solenoid, start engine. If vacuum is present, EEC-IV system is not cause of problem. Check exhaust gas recirculation system. If vacuum is not present, correct vacuum source blockage or leak and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
5. Turn key off and wait 10 seconds. Disconnect EGR solenoid. Set DVOM on 200-ohm scale and measure solenoid resistance. If reading is less than 65 ohms or more than 110 ohms, replace solenoid and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If resistance is between 65 and 110 ohms, connect solenoid and go to next step.
6. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage at EGR solenoid connector between VPWR circuit and ground. If reading is less than 10.5 volts, repair open in harness and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10.5 volts or higher, go to next step.
7. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin 35 and EGR circuit at connector. If reading is 5 ohms or higher, repair open circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 5 ohms, go to next step.
8. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Disconnect EGR solenoid. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 35 and test pins 40, 46, and 60. If any reading is less than 10,000 ohms, repair short to ground and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If any reading is 10,000 ohms or more, go to next step.
9. Turn key off and wait 10 seconds. Leave breakout box installed with ECA and EGR solenoid disconnected. With DVOM on 200,000-ohm scale, measure resistance between test pin 35 and test pins 37 and 57. If any reading is less than 10,000 ohms, repair short to power and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If code is still repeated, replace ECA. If any reading is 10,000 ohms or more, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

EGR ON/OFF Circuit. Scheme 84

TEST V - AIR MANAGEMENT SYSTEM

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: thermactor air system drive belt, air pump or valve.

1. Codes 44 (94), 45 (95) & 46 (96) Displayed. Ensure correct vacuum line routing to TAB/TAD solenoids and by-pass diverter valve. Use vehicle emissions label as a guide. Check for kinked or blocked vacuum lines. Check for kinked or blocked air hoses. Check for disconnected vacuum lines. If problems are detected, correct hose routing, repair faults and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If hoses are good and code 44 (94) is displayed, go to step 4). If code 46 (96) is displayed, go to step 3). If code 45 (95) is displayed, go to next step.
2. Code 45 (95) Displayed. This test applies to TAD equipped models only. Disconnect and plug vacuum line at diverter valve. Turn key off and wait 10 seconds. Repeat «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) and record codes. If code 45 (95) is displayed, EEC-IV system is okay. Check diverter valve and/or check valve for problem. If code 45 (95) is not displayed, go to step 4).
3. Code 46 (96) Displayed. This test applies to TAB equipped models only. Disconnect and plug vacuum line at by-pass valve. Turn key off and wait 10 seconds. Repeat «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) and record codes. If code 46 (96) is displayed, EEC-IV system is okay. Check by-pass valve for problem. If code 46 (96) is not displayed, go to next step.
4. Use only VOM/DVOM, not STAR tester, for this step. Turn key off and wait 10 seconds. With DVOM on 20-volt scale, connect DVOM negative test lead to STO at SELF-TEST connector and positive test lead to battery positive terminal. Using a jumper wire, connect STI circuit to signal return at SELF-TEST connector. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) until end of «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) codes (DVOM reads zero volts). Depress and release throttle. DVOM should change to a high voltage reading. If reading did not change, depress throttle to WOT and release. If STO voltage does not go high, go to «TEST HH - NO CODES/CODES NOT LISTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-hh-no-codescodes-not) , step 15). Leave test equipment hooked up. If reading changed, remain in «OUTPUT STATE CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__output-state-check) and go to next step.
5. Set DVOM on 20-volt scale. Connect DVOM positive test lead to VPWR circuit and negative test lead to TAB circuit at TAB solenoid. While observing DVOM, depress and release throttle several times to cycle output on and off. Repeat for TAD solenoid. Connect positive test lead to VPWR circuit and negative test lead to TAD circuit at TAD solenoid. Cycle output on and off. If either solenoid does not cycle on and off, remove jumper and go to step 8). If both solenoids cycle on and off, go to next step.
6. Connect vacuum pump to TAB solenoid vacuum supply port. Connect vacuum gauge to output port. Maintain vacuum at source while depressing and releasing throttle to cycle output on and off. Observe vacuum gauge. Repeat for TAD solenoid. If either vacuum output does not cycle on and off, replace solenoid assembly and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If both vacuum outputs cycle on and off, go to next step.
7. With vacuum lines disconnected at TAB/TAD solenoid assembly, start engine and check for vacuum. If vacuum is present, EEC-IV system is okay. Check thermactor valve and air pump for problem. If no vacuum is present, repair blockage and/or leaks as required and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
8. Turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Disconnect TAB and TAD solenoid connectors. Measure resistance of both solenoids. If either reading is less than 50 ohms or more than 100 ohms, replace TAB/TAD solenoid assembly and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If both readings are between 50 and 100 ohms, connect TAB and TAD solenoids. Go to next step.
9. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between TAB solenoid VPWR circuit and battery ground. Repeat for TAD solenoid. If either voltage reading is less than 10.5 volts, repair open circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If both readings are higher than 10.5 volts, go to next step.
10. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. With DVOM on 200-ohm scale, measure resistance between test pin 51 and TAB circuit at harness connector. Measure resistance between test pin 11 and TAD circuit at harness connector. If either reading is 5 ohms or higher, repair harness open circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If both readings are less than 5 ohms, go to next step.
11. Turn key off and wait 10 seconds. Set DVOM on 200,000-ohm scale. Leave breakout box installed and ECA disconnected. Disconnect TAB and TAD solenoid, and measure resistance between test pins 51 and/or 11 and test pins 37 and 57. If any reading is less than 10,000 ohms, repair short to power and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If any reading is 10,000 ohms or more, go to next step.
12. Turn key off and wait 10 seconds. Set DVOM on 200,000-ohm scale. Leave breakout box installed and ECA disconnected. Disconnect TAB and TAD solenoid, and measure resistance between test pins 51 and/or 11 and test pins 40, 46 and 60. If any reading is less than 10,000 ohms, repair circuit short to ground. Remove breakout box, connect harness to ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If code is repeated, replace ECA. If any reading is 10,000 ohms or more, replace ECA. Remove breakout box, connect harness to ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

Air Management Circuits. Scheme 85

TEST W - CANISTER PURGE (CANP) CHECK

1. Use only VOM/DVOM, not STAR tester, for this step. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale. Connect DVOM negative test lead to STO at SELF-TEST connector and positive test lead to positive battery terminal. Using a jumper wire, connect STI circuit to signal return at SELF-TEST connector. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) until end of «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) codes (DVOM reads zero volts). Depress and release throttle, DVOM should change to a high voltage reading. If reading did not change, depress throttle to WOT and release. If STO voltage does not go high, go to «TEST HH - NO CODES/CODES NOT LISTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-hh-no-codescodes-not) , step 15). Leave test equipment hooked up. If reading changed, remain in «OUTPUT STATE CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__output-state-check) and go to next step.
2. Set DVOM on 20-volt scale. Connect DVOM positive test lead to VPWR on CANP solenoid and negative test lead to CANP output circuit on solenoid. Depress and release throttle several times to cycle solenoid on and off. If CANP solenoid does not cycle, remove jumper wire and go to step 4). If CANP solenoid does cycle, go to next step.
3. Turn key off and wait 10 seconds. Remove jumper wire from STI to signal return. Disconnect vacuum hose from CANP solenoid on PCV side. Apply 16 in. Hg vacuum to solenoid. If CANP solenoid does not hold vacuum, replace it and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If code 42 is still displayed, service fuel evaporation system. If CANP holds vacuum, EEC IV is okay. Check fuel system.
4. Turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Disconnect CANP solenoid connector. Measure solenoid resistance. If reading is less than 40 ohms or more than 90 ohms, replace CANP solenoid and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is between 40 and 90 ohms, connect solenoid and go to next step.
5. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between VPWR at CANP harness connector and battery ground. If reading is less than 10.5 volts, repair open circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10.5 volts or more, go to next step.
6. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between CANP signal at connector and test pin 35. If reading is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 5 ohms, go to next step.
7. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Disconnect CANP solenoid. Set DVOM on 200,000-ohm scale. Measure resistance between test pins 40, 46, 60 and test pin 35. If any reading is less than 10,000 ohms, repair short to power. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If all readings are 10,000 ohms or more, go to next step.
8. Turn key off and wait 10 seconds. Leave CANP solenoid disconnected. Leave breakout box installed and ECA disconnected. Measure resistance between test pins 37, 57 and test pin 35. If all readings are less than 10,000 ohms, repair short to ground and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If code is repeated, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If any reading is 10,000 ohms or more, remove breakout box. Replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

Canister Purge (CANP) Circuit. Scheme 86

TEST X - IDLE SPEED CONTROL (BY-PASS AIR)

Note. If engine is running rough or has rough idle, correct before running test. Causes may be in ignition system, fuel system or EGR system.

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: engine not up to operating temperature, engine over operating temperature, improper idle speed/throttle stop adjustment or cruise control linkage.

1. Turn key off. Connect engine tachometer and start engine. Disconnect Idle Speed Control (ISC) harness. If RPM drops or if engine stalls, go to next step. If not, go to step 3).
2. If EGR service codes 31, 32, 33 or 34 are displayed, go to «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) table and perform appropriate test. If not, service next code. If codes 12 or 13 are displayed, go to next step.
3. Turn key off. Disconnect ISC harness. With DVOM on 200-ohm scale, measure resistance of ISC solenoid. If resistance is less than 7 ohms or more than 13 ohms, replace ISC solenoid and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If resistance is between 7 and 13 ohms, go to next step.
4. With key off and ISC harness disconnected, set DVOM on 200,000-ohm scale. Measure resistance from either ISC pin to ISC solenoid housing. If reading is 10,000 ohms or greater, go to step 5). If reading is less than 10,000 ohms, replace ISC solenoid. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
5. Leave ISC harness disconnected. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between VPWR circuit at ISC harness and battery ground terminal. If reading is less than 10.5 volts, repair open in circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10.5 volts or more, go to next step.
6. Turn key off and wait 10 seconds. Leave ISC harness disconnected. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. With DVOM on 200-ohm scale, measure resistance between test pin 21 and ISC circuit at ISC harness connector. If reading is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 5 ohms, go to next step.
7. Turn key off and wait 10 seconds. Leave ISC harness disconnected. Install breakout box, leaving ECA disconnected. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 21 and test pins 40, 46, and 60. If all readings are less than 10,000 ohms, repair short to ground and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If any reading is 10,000 ohms or more, go to next step.
8. Turn key off and wait 10 seconds. Leave breakout box installed. Leave ECA and ISC solenoid disconnected. With DVOM on 200,000-ohm scale, measure resistance between test pin 21 and 37. If reading is less than 10,000 ohms, repair short to power and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10,000 ohms or more, go to next step.
9. With key off, connect ECA and ISC. Leave breakout box installed. With vehicle prepared for «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) , set DVOM on 20-volt scale. Connect DVOM between test pin 21 and 40. Start engine and observe DVOM. If meter reading varies during «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) , replace ISC and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If meter reading does not vary during «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) , go to next step.
10. Code 13 Displayed. Disconnect ISC harness. Connect tachometer and repeat «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . Record service codes. If engine speed remains below 1500 RPM during test, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If engine speed does not remain below 1500 RPM, check engine vacuum hoses for proper routing and/or bad connections. Use vehicle emissions label as a guide. Make sure curb idle is correct. Ensure throttle plates are fully closed and throttle linkage is not binding. Check that cruise control linkage is not binding. If no mechanical problems appear, replace ISC and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
11. Turn key off and wait 10 seconds. Deactivate SELF-TEST. Start and run engine at 2000 RPM for 2 minutes, until inlet radiator hose is hot and pressurized. Turn key and wait 10 seconds. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . If code 17 is still displayed, inspect throttle body and air inlet for contamination. Service as necessary. If okay, adjust curb idle speed and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If code 17 is not displayed, service other codes as necessary.

Idle Speed Control (By-Pass Air) Circuit. Scheme 87

TEST Y - ISC (DC MOTOR) IDLE SPEED CONTROL (DC MOTOR/IDLE TRACKING SWITCH ASSEMBLY)

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: anti-diesel (run-on) speed set too high, engine condition (valves, vacuum leaks, valve timing, EGR valve, etc.), vacuum leaks, sticking throttle or on high cam.

Scheme 88

1. Code 68 Displayed. Turn key off and wait 10 seconds. Move throttle away from Idle Speed Control (ISC) motor shaft to simulate no throttle contact. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test). Check for code 68. Ignore all other codes at this time. If code 68 is displayed, release throttle and go to step 3). If code 68 is not displayed, release throttle and go to next step.
2. Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Install a jumper wire between test pins 41 and 1, and between test pin 21 and ground. If ISC motor does not retract, remove jumper wire and go to step 5). If ISC motor retracts and contacts throttle lever, check ISC mechanical adjustments. If ISC motor retracts, but does not contact throttle lever, remove jumper wire and go to step 23). NOTE: DO NOT leave jumper wire in test pins if ISC motor will not move. Remove jumper wire as it will damage breakout box wiring.
3. Turn key off and wait 10 seconds. Disconnect harness at ISC motor. Install a jumper wire between pin 3 and 4 at ISC connector to simulate closed contact condition. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test). If code 68 is not displayed, replace motor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If code 68 is displayed, go to next step. (Scheme 88): ISC Motor Jumper Wire Installation
4. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Leave ISC harness disconnected. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 46 and signal return circuit at ISC connector. Also measure resistance between test pin 28 and Idle Tracking Switch (ITS) circuit at ISC connector. If either reading is 5 ohms or more, repair bad circuit. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If both readings are less than 5 ohms, replace ECA. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).
5. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Disconnect ISC motor harness and set DVOM on 200-ohm scale. Measure resistance between test pin 41 and ISC ground circuit, and between test pin 21 and ISC power circuit at ISC connector. If either reading is 5 ohms or more, repair wiring and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If both readings are less than 5 ohms, go to next step.
6. Turn key on, leaving engine off. Leave breakout box installed and ECA disconnected. Leave harness disconnected from ISC motor and set DVOM on 20-volt scale. Measure voltage between test pin 41 and test pins 40 and 60. Also measure voltage between test pin 21 and test pins 40 and 60. If any reading is 1 volt or more, repair short to power. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If code 12 is still displayed, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If all readings are less than 1 volt, go to next step.
7. Turn key off and wait 10 seconds. Leave breakout box installed with ECA and ISC motor disconnected. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 41 and test pins 40, 46, and 60. Also measure resistance between test pin 21 and test pins 40, 46, and 60. If any reading is 10,000 ohms or less, repair bad circuit. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If code 12 is still displayed, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If all readings are more than 10,000 ohms, go to next step.
8. Turn key off and wait 10 seconds. Leave breakout box installed with ECA and ISC motor disconnected. Set DVOM on 20-volt scale. Connect DVOM positive test lead to test pin 1 and negative test lead to ground. If reading is less than 10.5 volts, repair open in KAPWR circuit. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If code 12 is still displayed, go to next step. If reading is 10.5 volts or more, go to next step.
9. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Connect ISC motor. Install a jumper wire between test pin 21 and 1, and between test pin 41 and ground to extend ISC motor shaft. If shaft does not extend 2 in. (51 mm) or more, replace motor. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If shaft does extend far enough, go to next step.
10. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Install a jumper wire between test pin 41 and test pin 1, and between test pin 21 and ground to retract ISC motor shaft. If shaft does not retract, replace motor. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If shaft does retract, go to next step.
11. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Install a jumper wire between test pin 21 and test pin 1, and between test pin 41 and ground to extend ISC motor shaft. If shaft does not extend, replace motor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If shaft does extend, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).
12. Code 58 Displayed. Turn key off and wait 10 seconds. Press on ISC motor shaft to simulate throttle contact. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) while maintaining pressure on shaft. Check for code 68. Ignore all other codes at this time. If code 68 is displayed, go to step 5). If code 68 is not displayed, go to next step.
13. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Install a jumper wire between test pin 41 and test pin 1, and between test pin 21 and ground to retract ISC shaft. If shaft retracts, check ISC motor adjustments. If shaft does not retract, go to next step.
14. Turn key off and wait 10 seconds. Connect ECA and disconnect harness from ISC. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test). Check for code 68. Ignore all other codes at this time. If code 68 is displayed, replace motor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If code 68 is not displayed, go to next step.
15. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Leave ISC harness disconnected. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 28 and test pins 40, 46, and 60. If any reading is less than 10,000 ohms, repair short to ground. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If all readings are 10,000 ohms or more, replace ECA. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).
16. Code 12 Displayed. If codes 58, 68, 31, or 41 are also displayed, go to «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) table for appropriate test(s). If these codes are not displayed, go to next step.
17. Check throttle plates and linkage for binding. If vehicle is equipped with cruise control, make sure that cruise control linkage is not binding. If throttle or linkage is binding, repair problem as necessary and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If no problem is found with linkage or throttle plates, go to next step.
18. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Install a jumper wire between test pin 21 and test pin 1, and between test pin 41 and ground to extend ISC motor shaft. If shaft does not extend, replace motor and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If shaft does extend, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).
19. Code 13 & 16 Displayed. Prepare vehicle for normal operation. Deactivate SELF-TEST and turn A/C off. Start and run engine at idle for 30 seconds, then at part throttle for 5 seconds. Repeat this sequence for 3 minutes. If idle speed is erratic, check for vacuum leaks or codes 22, 31, 41, or 58. Repair vacuum leaks and service codes as necessary before going on with test. If idle speed is not erratic, go to next step.
20. Check throttle plate linkage for sticking or binding. Check choke for sticking or binding. Make sure throttle does not hang on high cam step. If any fault is found, repair and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If no fault is found, go to next step.
21. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) and record service codes. Leave key on. Turn engine off. If code 68 is displayed, go to step 1). If code 68 is not displayed, check anti-diesel (run-on) speed adjustment.
22. Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Disconnect harness from ISC motor and set DVOM on 200,000-ohm scale. Measure resistance between test pin 41 and test pins 40, 46, and 60. Also measure resistance between test pin 21 and test pins 40, 46, and 60. If any reading is 10,000 ohms or less, repair bad circuit. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If code 12 is still displayed, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If all readings are greater than 10,000 ohms, go to next step.
23. Turn key on, leaving engine off. Leave breakout box installed with ECA and ISC disconnected. Set DVOM on 20-volt scale. Measure voltage between test pin 41 and test pins 40 and 60. Also measure voltage between test pin 21 and test pins 40 and 60. If any reading is 1 volt or more, repair short circuit to power. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If code 12 is still displayed, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If all voltage readings are less than 1 volt, go to next step.
24. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Connect ISC motor. Install a jumper wire between test pin 21 and 1, and between test pin 41 and ground to extend ISC motor shaft. If shaft does not extend, replace motor. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing). If shaft does extend, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing).

Idle Speed Control (DC Motor/Idle Tracking Switch Assembly) Circuit. Scheme 89

TEST BB - SIL (SHIFT INDICATOR LIGHT)

1. Use only VOM/DVOM, not STAR tester, for this step. Turn key off and wait 10 seconds. Put transmission in Neutral. Set DVOM on 20-volt scale. Connect DVOM negative test lead to STO at SELF-TEST connector and positive test lead to positive battery terminal. Install a jumper wire between STI and signal return at SELF-TEST connector. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) until end of «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) codes (DVOM reads zero volts). Depress and release throttle while watching DVOM reading. If reading did not change to a high voltage, depress throttle to WOT position and release. If STO voltage does not go to high reading, go to step 7). Leave test equipment hooked up. If reading changes to high voltage, remain in «OUTPUT STATE CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__output-state-check) and go to next step.
2. If truck is equipped with 4.9L FBC engine, go directly to step 5). On all others, set DVOM on 20-volt scale. Connect DVOM positive test lead to battery positive terminal and negative test lead to pin 1 on dimmer relay. Depress and release throttle several times to cycle relay on and off. If relay does not cycle, go to step 5). If relay cycles, go to next step.
3. Set DVOM on 20-volt scale. Connect DVOM positive test lead to battery positive terminal and negative test lead to pin 2 on dimmer relay. Depress and release throttle several times to cycle relay on and off. If relay does not cycle, remove jumper wire and replace dimmer relay. If relay does cycle, remove jumper wire and go to next step.
4. Turn key off and wait 10 seconds. With DVOM set to 200-ohm scale, measure resistance between pin 2 of dimmer relay and SIL bulb. If reading is less than 5 ohms, replace SIL bulb. If reading is 5 ohms or more, repair open circuit in harness. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
5. Set DVOM on 20-volt scale. Connect DVOM positive test lead to battery positive terminal and negative test lead to SIL circuit of top gear switch. Depress and release throttle several times to cycle SIL circuit on and off. If truck uses a 4.9L FBC engine and SIL circuit cycles, change SIL bulb. If SIL circuit cycles on all others, repair open circuit in harness and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If SIL circuit does not cycle (all models), go to next step.
6. Set DVOM on 20-volt scale. Connect DVOM positive test lead to positive battery terminal and negative test lead to STO circuit of top gear switch. Depress and release throttle several times to cycle STO circuit on and off. If STO circuit cycles, replace top gear switch. If STO does not cycle, repair open circuit in harness and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
7. Use only VOM/DVOM, not STAR tester, for this step. Turn key off and wait 10 seconds. Put transmission in top gear. Set DVOM on 20-volt scale. Connect DVOM negative test lead to STO at SELF-TEST connector and positive test lead to positive battery terminal. Install a jumper wire between STI and signal return at SELF-TEST connector. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) until end of «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) codes (DVOM reads zero volts). Depress and release throttle while watching DVOM reading. If reading changed to high voltage, check SIL bulb and fuse No. 15. If bulb and fuse are good, repair short to ground in SIL circuit. If reading did not change to high voltage, go to «TEST HH - NO CODES/CODES NOT LISTED»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-hh-no-codescodes-not) , step 15).

Shift Indicator Light (SIL) Circuits. Scheme 90

TEST EE - DYNAMIC RESPONSE TEST

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: person testing EEC-IV system did not perform brief wide open throttle (WOT) after Dynamic Response code, mechanical engine problems, or engine did not go over 2000 RPM.

Code 77 Displayed. Repeat KEY ON/ENGINE RUNNING SELF-TEST . With SELF-TEST activated, restart engine. Code 2 (20 on STAR tester) indicates start of test. After Dynamic Response code 1 (10 on STAR tester) is displayed, perform brief WOT. Dynamic Response service codes will be displayed. If code 77 is still present, replace ECA and repeat QUICK TEST . If code 77 is not displayed, TEST EE - DYNAMIC RESPONSE TEST passed. Service other codes (if displayed) as required.

TEST FF - IGNITION DIAGNOSTIC MONITOR (IDM)

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: ignition module, ignition coil, spark plugs and/or high tension cables, distributor and PIP sensor.

1. Turn key off and wait 10 seconds. Disconnect E-Core ignition connector from coil. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 4 and negative terminal on ignition coil. If reading is less than 20,000 ohms or higher than 24,000 ohms, repair open circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is between 20,000 and 24,000 ohms, go to next step.
2. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. With DVOM on 200,000-ohm scale, measure resistance between test pin 4 and test pins 40, 46, and 60. If any reading is less than 10,000 ohms, repair short to ground and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If all readings are 10,000 ohms or more, go to next step.
3. Turn key off and wait 10 seconds. Deactivate SELF-TEST. Using «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , observe VOM or STAR tester LED for indication of fault while lightly tapping on TFI module and wiggling TFI harness connector. If fault is indicated, disconnect TFI harness. Inspect connector and terminals for damage. If connector and terminals are okay, check TFI ignition system. If no fault is indicated, go to next step.
4. While in «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , observe VOM or STAR tester LED for indication of fault while wiggling, shaking, or bending small sections of harness while working from TFI connector toward firewall. Repeat process from firewall to ECA. Perform this test to check for faults in the following circuits: PIP Open/Shorted to Ground - Check circuit at Test Pin 56. SPOUT Shorted to Ground - Check circuit at Test Pin 36. Ignition Ground Open - Check circuit at Test Pin 16. IDM Open/Shorted to Ground/Power - Check circuit at Test Pin 4.
5. Perform «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) on circuits one at a time in order to isolate fault. If fault is indicated, isolate and repair harness. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If no fault is indicated, go to next step.
6. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector and terminals for damage. If connector and terminals are damaged, repair as necessary and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If connector and terminals are okay, fault cannot be duplicated at this time. IDM testing is complete. Connect ECA.

IDM Circuits. Scheme 91

TEST GG - SPARK TIMING CHECK

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: engine condition (valves, vacuum leaks, valve timing, EGR valve, etc.), PIP sensor, TFI ignition module.

1. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) and verify that SELF-TEST is activated. Check and record timing while in «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . System locks timing then returns to normal 2 minutes after last service code is displayed. If timing is 27-33°, spark timing is correct. Go to «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . If timing is not 27-33°, go to next step.
2. Locate Spark Output (SPOUT) connector and open the connection. Start engine and check for 10° BTDC base timing F 3°. If base timing is correct, go to next step. If base timing is not correct, adjust base timing. After timing is adjusted, connect SPOUT and perform «TIMING CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__timing-check) . See «TIMING CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__timing-check) in «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) (ALL VEHICLES) section of this article.
3. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box. Turn key on, leaving engine off. With DVOM on 20-volt scale, measure voltage between test pin 37 and 40, and between test pin 57 and 60. If either reading is less than 10.5 volts, go to «TEST B - VEHICLE BATTERY»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-b-vehicle-battery) , step 1). If both readings are 10.5 volts or more, go to next step.
4. Turn key off and wait 10 seconds. Disconnect harness connector at TFI module. With DVOM on 200-ohm scale, measure resistance between test pin 36 and pin 2 (SPOUT circuit) at TFI harness connector. If reading is greater than 5 ohms, repair open circuit. Connect SPOUT connector and check timing as described in step 1). If reading is 5 ohms or less, go to next step.
5. Leave breakout box installed and TFI harness disconnected. Turn key off and set DVOM on 200-ohm scale. Measure resistance between test pin 16 and pin 6 (IGN GRND circuit) at TFI harness connector. If reading is less than 5 ohms, go to «TEST A - NO START»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-a-no-start) , step 7). If reading is 5 ohms or more, repair harness as necessary and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

Spark Timing Check Circuit. Scheme 92

TEST HH - NO CODES/CODES NOT LISTED

1. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale. Disconnect Throttle Position Sensor (TPS). Turn key on, leaving engine off. Measure voltage between VREF circuit at TPS harness connector and signal return circuit in SELF-TEST connector. If reading is less than 4 volts or more than 6 volts, go to «TEST C - REFERENCE VOLTAGE»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-c-reference-voltage) , step 1). If reading is between 4 and 6 volts, connect TPS and go to next step.
2. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin 48 and Self-Test Input (STI) at SELF-TEST connector pigtail. If reading is 5 ohms or more, repair open in circuit. If reading is less than 5 ohms, go to next step.
3. With breakout box installed and DVOM on 200-ohm scale, measure resistance between test pin 17 and Self-Test Output (STO) at SELF-TEST connector. If reading is 5 ohms or more, repair open in circuit. If reading is less than 5 ohms, go to next step.
4. Turn key off. With breakout box installed and DVOM on 200-ohm scale, measure resistance between test pin 49 and EGO sensor engine block ground. If reading is 5 ohms or more, repair EGO sensor ground wire or open circuit bad connection. If reading is less than 5 ohms, go to next step.
5. With breakout box installed and DVOM on 200-ohm scale, measure resistance between STO at SELF-TEST connector and engine block ground. If reading is more than 5 ohms, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 5 ohms, go to next step.
6. Leave key off and breakout box installed. Set DVOM on 20 volt scale. Connect DVOM between test pin 30 and test pin 40 or 60. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . If reading is greater than 1 volt, repair intermittent fault in NDS harness connector or switch. If okay, go to «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) for appropriate service codes. If reading is not greater than 1 volt, repair intermittent fault in NDS harness connector or switch. If okay, go to next step.
7. Leave key off and breakout box installed. Set DVOM on 20 volt scale. Connect DVOM to test pin 37 or 57 and test pin 40 or 60. Turn key on, then off. Wait 10 seconds. If reading does not changes from 10.5 volts (or higher) to zero volts, replace EEC power relay. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading changes from 10.5 volts (or higher) to zero volts, go to next step.
8. If vehicle is not equipped with shift indicator light, repair Self-Test Output (STO) circuit for short to ground. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If vehicle is equipped with shift indicator light, go TEST BB - SIL, step 7).
9. Continuous Code 15 Displayed. Clear continuous memory codes using procedure described in «CONTINUOUS SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-self-test) . Repeat «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) through continuous memory code output. If continuous code 15 is not displayed, continuous code 15 testing is complete. If continuous code 15 is displayed, go to next step. NOTE: Continuous code 15 is displayed when power to Keep Alive Memory (KAM), test pin 1 at ECA is interrupted. Code 15 may also be displayed the first time SELF-TEST is performed and power is restored to ECA. Repeat SELF-TEST to ensure correct diagnosis.
10. Ensure that EEC-IV components and wiring are not close to high tension secondary voltage wires or ignition components. If EEC-IV wiring is close to high tension wires, reroute EEC-IV wiring and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If continuous code 15 is no longer displayed, continuous code 15 testing is complete. If continuous code 15 is still displayed, go to next step.
11. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Install breakout box, leaving ECA disconnected. Set DVOM on 20-volt scale. Connect DVOM positive test lead to test pin 1 and negative test lead to pin 40 or 60. Turn key on and observe voltage reading. If reading is less than 10 volts, repair open to KAM circuit. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is 10 volts or greater, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
12. Check or perform diagnosis of non-EEC related areas. Check all areas that may contribute to a particular condition in order of probability, ease of accomplishment, and accessibility. Use your technical knowledge and experience to determine which areas may be the source of problem before starting a more involved diagnosis. After correcting faults, go to next step.
13. Turn key off and wait 10 seconds. Install tachometer. Start engine and attempt to maintain engine at 2000 RPM for 2 minutes. If 2000 RPM can be maintained, go to «TEST A - NO START»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-a-no-start) , step 13). If 2000 RPM cannot be maintained, go to next step.
14. With engine at operating temperature and tachometer installed, turn key off and wait 10 seconds. Perform «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) while maintaining engine at 2000 RPM. If code 11 (Pass) is displayed, go to «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-running-self-test) . If any other service code is displayed, go to «KEY ON/ENGINE RUNNING SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) table and service code(s) as instructed. If no codes are displayed, go to step 1).
15. Output State Check Not Functioning. Turn key off and wait 10 seconds. Perform «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__key-onengine-off-self-test) and leave key on to enter «OUTPUT STATE CHECK»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__output-state-check) . If codes 23, 53, 63 or 68 are displayed, go to «KEY ON/ENGINE OFF SELF-TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) table and service code(s) as instructed. If no codes are displayed, go to step 1). If code 11 (Pass) is displayed, go to next step.
16. Check throttle and linkage for sticking or binding. If throttle and linkage are okay, replace TPS and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If throttle and linkage are binding, repair as necessary and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .
17. Power To ECA Check. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between test pin 37 and 40, and between test pin 57 and 60. If either reading is less than 10.5 volts, go to «TEST B - VEHICLE BATTERY»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-b-vehicle-battery) , step 1). If both readings are 10.5 volts or more, replace ECA and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

No Codes/Codes Not Listed Circuits. Scheme 93

TEST II - SYSTEM CHECK

1. ISC Check. Attempt to start engine at part throttle. If engine runs only at part throttle, go to «TEST X - IDLE SPEED CONTROL (BY-PASS AIR)»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-x-idle-speed-control) , step 3). If engine does not run, go to next step.
2. MAP Check. Turn key off. Disconnect MAP sensor. Connect MAP tester between harness and MAP sensor. Connect banana plugs of tester into DVOM. Set DVOM on 20-volt scale. Turn key to "ON". Measure sensor voltage output while cranking engine. If DVOM reading does not decrease from specified range, go to «TEST G - MAP/BP SENSOR»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__test-g-mapbp-sensor) , step 13). If DVOM reading decreases from specified range, go to next step.

MAP VOLTAGE OUTPUT

TEST JJ - ERRATIC IGNITION

1. Code 14 Displayed. This code indicates that 2 successive erratic Profile Ignition Pick-Up (PIP) pulses were sent to ECA, causing possible engine miss or stall. Check EEC-IV and TFI ignition system for loose wires and connections, arcing secondary ignition components (coil, cap, wires, etc.), or an on-board 2-way radio. Make sure radio antenna and power leads are routed properly. If any of the above conditions are present, repair as necessary and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If none are present, go to next step.
2. Turn key off and wait 10 seconds. Deactivate SELF-TEST. Using «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , observe VOM or STAR tester LED for indication of fault while lightly tapping on TFI ignition module and distributor, and while wiggling TFI harness connector. If fault is indicated, disconnect and inspect connectors and terminals. If connectors and terminals are okay, diagnose TFI ignition system. If no fault is indicated, go to next step.
3. While in «CONTINUOUS MONITOR (WIGGLE) TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing__continuous-monitor-wiggle-test) , observe VOM or STAR tester LED for fault while wiggling, shaking, or bending small sections of harness from TFI module to firewall. Also check harness from firewall to ECA. Isolate PIP circuit, if required. If fault is indicated, isolate and repair problem. Repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If no fault indicated, go to next step.
4. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector and terminals for damage. If connector and terminals are okay, fault cannot be duplicated at this time. Diagnose TFI ignition system. If connector and terminals are damaged, repair as necessary and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) .

TEST KK - INLET AIR SOLENOID (IAS)

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: air or vacuum leaks, heat riser or stovepipe.

1. Locate and disconnect Air Charge Temperature (ACT) sensor. Start vehicle. If inlet air door on air cleaner closes, IAS is functioning correctly. Check non-EEC related areas. If inlet air door does not close, go to next step.
2. With key off, disconnect both vacuum hoses from IAS. Connect both vacuum hoses and start vehicle. If inlet air door closes, connect vacuum hose at source and go to step 4). If inlet air door does not close, go to next step.
3. Turn key off. Connect vacuum pump to inlet air valve vacuum hose and apply vacuum. If inlet air door closes, verify proper vacuum source. If inlet air door does not close, check inlet air duct and valve assembly.
4. Turn key off and wait 10 seconds. Disconnect IAS solenoid connector. With DVOM on 200-ohm scale, measure IAS solenoid resistance. If reading is less than 65 ohms or higher than 110 ohms, replace IAS solenoid and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is between 65 and 110 ohms, connect IAS solenoid and go to next step.
5. Turn key on, leaving engine off. With DVOM on 20-volt scale, measure voltage between VPWR circuit at IAS solenoid and ground. If voltage reading is less than 10.5 volts, repair open circuit in harness and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If voltage reading is 10.5 volts or higher, go to next step.
6. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin 59 and IAS circuit at harness connector. If reading is 5 ohms or higher, repair open circuit and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If reading is less than 5 ohms, go to next step.
7. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Disconnect IAS solenoid. Set DVOM on 200,000-ohm scale. Measure resistance between test pin 59 and test pins 40, 46, and 60. If any reading is less than 10,000 ohms, repair short to ground and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If all readings are 10,000 ohms or higher, go to next step.
8. Turn key off and wait 10 seconds. Leave breakout box installed and ECA and IAS solenoid disconnected. Set DVOM on 200,000 ohm scale. Measure resistance between test pin 59 and test pins 37 and 57. If any reading is less than 10,000 ohms, repair short to power and repeat «QUICK TEST»(/ford/club-wagon-e350/1985-1988/remont/testing-diagnostics/#49l-feedback-carburetor-eec-iv-testing) . If all readings are 10,000 ohms or higher, go to next step.
9. Turn key off. Connect IAS solenoid. Leave breakout box installed and ECA disconnected. Install a jumper wire between test pin 59 and 40. Start engine. If inlet air door closes, replace ECA. If inlet air door does not close, replace IAS solenoid.

Inlet Air Solenoid (IAS) Circuit. Scheme 94

See also:
• QUICK TEST
• CIRCUIT TESTS
• KEY ON/ENGINE OFF
• KEY ON/ENGINE RUNNING
• CONTINUOUS SELF-TEST
• EQUIPMENT HOOK-UP
• TEST A - NO START
• CONTINUOUS MONITOR (WIGGLE) TEST
• PREPARATION
• TIMING CHECK
• TEST HH - NO CODES/CODES NOT LISTED
• DIAGNOSIS BY SYMPTOM
• TEST GG - SPARK TIMING CHECK
• CLEARING CONTINUOUS MEMORY CODES
• CONTINUOUS MEMORY CODES TO BE TESTED
• TEST U - EGR ON/OFF CHECK
• TEST Y - ISC (DC MOTOR)
• TEST W - CANISTER PURGE (CANP) CHECK
• TEST BB - SIL
• TEST Q - FBC FUEL CONTROL
• TEST C - REFERENCE VOLTAGE
• TEST B - VEHICLE BATTERY
• DYNAMIC RESPONSE CHECK
• OUTPUT STATE CHECK
• TEST EE - DYNAMIC RESPONSE TEST
• TEST X - IDLE SPEED CONTROL (BY-PASS AIR)
• TEST G - MAP/BP SENSOR