7.5l Eec-Iv Testing Ford Club Wagon E150

DIAGNOSIS & TESTING

Note. A number of tests or steps may have been deleted from some of the procedures. This is to eliminate testing which does not apply. Some graphics and tables may include others.

DIAGNOSTIC FORMATS

There are 2 diagnostic formats used to test and service the EEC-IV system: QUICK TEST and CIRCUIT TESTS. A DIAGNOSIS BY SYMPTOM chart is available to identify specific problems and reference specific CIRCUIT TESTS, if no Key On Engine Off (KOEO) or Key On Engine Running (KOER) fault code is identified.

Always start with the QUICK TEST procedures before attempting any CIRCUITS TESTS. The QUICK TEST procedure is designed to allow the technician to identify problems and retrieve service codes. The CIRCUIT TESTS give procedures for testing circuits and checking sensors and actuators. If a vehicle passes the QUICK TEST procedures, and there are no driveability problems, the EEC-IV system is okay. Problem exists somewhere else besides the EEC-IV system. If an intermittent driveability problem exists, use the KOER "Wiggle" Test procedure to set a code or identify the problem.

KOEO and KOER SELF-TEST Codes

Note. For codes display methods refer to illustrations (Scheme 215)- (Scheme 218) under CODE FORMAT DIAGRAMS.

All service codes are 2 digit numbers which are generated one digit at a time. These codes indicate a current fault in the system. They should be serviced in the order in which they appear. Use the appropriate code chart to find the correct CIRCUIT TEST. Codes are shown as voltage pulses (needle sweeps) on an analog Volt/Ohmmeter (VOM).

If a VOM is being used, pay careful attention to the length of the pauses in order to read the codes correctly. There will be a 1/2 second pause between the number of sweeps indicating a digit and a 2 second pause between each digit in a code. There will be a 4 second pause between each code. The KOEO SELF-TEST memory codes are separated from the Continuous Memory codes by a 6 second delay, a single 1/2 second sweep (Separator), and another 6 second delay. Always record the codes in the order received.

If a scan tool diagnostic 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 (10) and Dynamic Response (10) codes. The Dynamic Response code is displayed in the KOER SELF-TEST.

If the "CHECK ENGINE" light is used, service codes will be displayed as flashes. On Continental models, the "MESSAGE CENTER" may be used to display codes.

Separator Pulse

A single 1/2 second separator pulse is issued 6-9 seconds after last functional KOEO 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 by the ECA during continuous self test monitoring. These codes are displayed during the KOEO SELF-TEST after the separator pulse code. These codes should be used for diagnosis, ONLY when KOEO and KOER SELF-TEST results in a Code 11 (pass code) and all QUICK TEST steps have been successfully completed. There are a few exceptions which may be checked after the KOEO SELF-TEST codes have been repaired. These codes indicate a fault that has been recorded within the last 40 key starts. The fault may or may not be currently present.

Fast Codes

At the start of the KOEO testing and after the WOT request in the KOER test there is an output from the ECA known as "Fast Codes". These are short bursts of information that are used by the manufacturer during assembly. With most equipment these code bursts are not visible as the whole code sequence lasts less than 1/2 second. Ignore this fluctuation if noticed with your test equipment.

CLEARING CODES

Service codes are retrieved from the EEC-IV system through the Self-Test connector by using various test equipment. The KOEO and KOER SELF-TESTS are used for this purpose. After these codes have been recorded or repaired, they may be cleared from the ECA memory.

To clear continuous memory codes, run the KOEO SELF-TEST, when service codes begin to appear on your test equipment or "Check Engine" light, disconnect the jumper wire from the STI connector. If using a STAR tester, unlatch the center button. This will erase continuous memory codes from the processor's memory. If a problem has not been corrected, or the fault is still present, the code will be immediately reset into the ECA memory.

Scheme 215

Scheme 216

Scheme 217

Scheme 218

DESCRIPTION

The QUICK TEST diagnostic procedure is a functional test of the EEC-IV system. It consists of 7 basic test steps. These basic steps must be carefully followed in sequence, otherwise misdiagnosis, or replacement of non-faulty components may result.

1. VISUAL CHECK & VEHICLE PREPARATION
2. EQUIPMENT HOOK-UP
3. KEY ON ENGINE OFF (KOEO) SELF-TEST
4. COMPUTED TIMING CHECK
5. KEY ON ENGINE RUNNING (KOER) SELF-TEST
6. CONTINUOUS MONITOR MODE (WIGGLE TEST)
7. DIAGNOSIS BY SYMPTOM

After all tests, servicing, or repairs have been completed, repeat QUICK TEST to ensure all EEC-IV systems work properly.

The KOEO and KOER SELF-TESTS are intended to detect faults present at the time of testing, not intermittent faults. Intermittent faults are recorded and stored as Continuous Memory Codes, or may be detected by CONTINUOUS MONITOR MODE "WIGGLE" TEST, which is entered after the KOER SELF-TEST. See CONTINUOUS MEMORY MONITOR MODE . A fault discovered during the "Wiggle" Test, may or may not set a code in the Continuous Memory, but the "Wiggle" Test is always circuit specific as directed in the CIRCUIT TESTS.

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

VISUAL CHECK & VEHICLE PREPARATION

Before hooking up any equipment to diagnose the EEC system, make the following visual checks and perform the preparation procedures

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, bent or broken pins, loose wires or terminals, and proper routing.
4. Check the ECA, sensors and actuators for physical damage.
5. Check engine coolant level.
6. Perform all necessary safety precautions to prevent personal injury or vehicle damage.
7. Set parking brake and place shift lever in "P" for automatic transmissions, and Neutral for manual transmissions. DO NOT move shift lever during test unless specifically directed to do so.
8. Turn off all lights and accessories. Ensure vehicle doors are closed when making voltage or resistance readings.
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 off. Service items as required, then go to «TEST EQUIPMENT HOOK-UP»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) .

STAR Tester

Turn ignition switch to "OFF" position. Connect color coded adapter cable leads to diagnostic tester. Connect adapter cable's 2 service connectors to vehicle Self-Test and STI connectors. (Scheme 219) Connect timing light. Go to KEY ON ENGINE OFF (KOEO) SELF-TEST.

Scheme 219

Volt/Ohm Meter

1. Turn ignition switch to "OFF" position. 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 220) Connect timing light, and go to «KEY ON ENGINE OFF (KOEO) SELF-TEST»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing). KOEO SELF-TEST is activated by connecting jumper wire from Self-Test Input (STI) pigtail to pin No. 2 (Signal Return) on Self-Test connector with the ignition on.

Scheme 220

Key On Engine Off (KOEO) - Self-Test Special Notes

When preparing to perform the Key On Engine Off (KOEO) self-test. Be aware of the following conditions

1. It may be necessary to service non-EEC-IV faults before running Key On Engine Off (KOEO) Self-Test.
2. Continuous Memory Codes recorded in this step will be used for diagnosis in Continuous Self Test after a PASS code 11 is received in both the Key On Engine Off (KOEO) and the Key On Engine Running (KOER) Self-Tests. See «CONTINUOUS SELF TEST»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing).
3. Deviation from this procedure may cause the output of false codes.
4. The first set of codes to appear are the KOEO SELF-TEST codes, they will be repeated twice, followed by the SEPARATOR pulse signal and then the CONTINUOUS MEMORY codes [KOEO-Separator-Continuous Memory]. These codes will also be repeated twice. Example: for a code display of 11-1(0)-11. The first number 11 is a KOEO code 11, the second number is a separator code 10, and the third number is a continuous code 11. An illustration of this code sequence may be found in (Scheme 215) - (Scheme 218).

Key On Engine Off (KOEO) Self-Test - Test Procedure

Note. This test procedures has been revised based on updated procedures in Ford Technical Service Bulletin, 89-18A-10.

1. Turn ignition switch to "OFF" position. Ensure all procedures of «VISUAL CHECK & VEHICLE PREPARATION»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__visual-check-vehicle-preparation) and «TEST EQUIPMENT HOOK-UP»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) have been followed. Engine should be at normal operating temperature.
2. Activate the KOEO Self-Test.
3. Turn ignition switch to the "ON" position. If Star Tester is being used latch center button in down position at this time. If using an analog VOM, connect a jumper wire from Self-Test Input (STI) pigtail to pin No. 2 (Signal Return) on Self-Test connector. (Scheme 220)and (Scheme 217). If using "Check Engine" (MIL) light, connect a jumper wire from Self-Test Input (STI) pigtail to pin No. 2 (Signal Return) on Self-Test connector. This will activate the KOEO Self-Test, "Check Engine" (MIL) light will start to flash.
4. The ECA will run through a test cycle, opening and closing various solenoids and switches. After the completion of the test cycle the codes will appear. Record all codes.

Test Procedure - Code Output

Code Output, indications and actions to be taken.

1. Code Output [11-1(0)-11] Both tests indicate a PASS. Action to take: If engine idles rough or runs rough, Go to «TEST D19 - SYSTEM CHECK»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d19-system-check) , step 2). If this symptom is not present; Go to «COMPUTED TIMING CHECK»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__computed-timing-check) . If engine is a no start, go to «TEST A1 - NO START»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a1-no-start) .
2. Code Output [Any Code(s)-1(0)-11] KOEO tests indicates a FAULT. Action to take: Go to KOEO service codes. See «KEY ON ENGINE OFF (KOEO) CIRCUIT TEST MENU»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) . Always start with the first code displayed.
3. Code Output [11-1(0)-Exceptions] Continuous Memory indicates a FAULT. Action to take: DO NOT service continuous memory codes at this time. If engine idles rough or runs rough, go to «TEST D19 - SYSTEM CHECK»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d19-system-check) , step 2). If this symptom is not present, go to «COMPUTED TIMING CHECK»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__computed-timing-check) . Refer to code output. See «KOEO CONTINUOUS MEMORY CODE EXCEPTIONS»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__koeo-continuous-memory-code-exceptions) . Service only the KOEO CONTINUOUS MEMORY CODE EXCEPTIONS at this time. All other Continuous Memory Codes will be serviced after a Code 11 is displayed during the KOER SELF-TEST.
4. Code Output [Any Code(s)-1(0)-Any Code(s)] Both tests indicate a FAULT. Action to take: DO NOT service CONTINUOUS MEMORY CODES at this time. Go to KOEO service codes. See «KEY ON ENGINE OFF (KOEO) CIRCUIT TEST MENU»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) . Always start with the first code displayed.
5. Code Output [11-1(0)-15] Action to take: Go to «TEST D15 - KOEO CODE 15»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d15-koeo-code-15) .

KOEO Continuous Memory Code Exceptions

KOEO continuous memory code (any code(s) except) list. Only codes that apply to vehicle being diagnosed are listed. See KOEO CONTINUOUS MEMORY CODE EXCEPTIONS table.

KOEO CONTINUOUS MEMORY CODE EXCEPTIONS

No Starts

If engine does not start, go to TEST A1 - NO START , step 1). Proceed through this test procedure until engine is running and then repeat KOEO SELF-TEST. If engine stalls or is unable to complete KOEO SELF-TEST, DIAGNOSIS BY SYMPTOM may be used until engine is able to complete KOEO SELF-TEST.

No Codes Displayed Or Codes Displayed Not Listed

The KOEO SELF-TEST did not activate or non-system codes were displayed. Repeat KOEO SELF-TEST to verify condition. If condition still exists go to TEST D14 - NO CODES , step 1).

COMPUTED TIMING CHECK

1. Turn key off and wait 10 seconds. Start engine. Activate KOER SELF-TEST. After the last service code has been displayed, the timing will remain fixed for 2 minutes, unless KOER SELF-TEST is deactivated.
2. Correct Self-Test timing equals base ignition timing (10 degrees BTDC on most engines, see emission decal) plus 17-23 degrees BTDC. If timing is not 27-33 degrees BTDC, go to «TEST D13 - SPARK TIMING»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d13-spark-timing) . If timing is 27-33 degrees BTDC, proceed with «KEY ON ENGINE RUNNING (KOER) SELF-TEST»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) .

CODE/TEST MENU (KOEO)

KEY ON ENGINE OFF (KOEO) CIRCUIT TEST MENU

This test checks engine sensors under actual operating conditions and at operating temperature. The ECA operates and tests actuators and sensors during this test. A number of special test procedures may be requested by the ECA during this test, depending on vehicle equipment. These tests allow the ECA to test the following sensors.

Engine ID Codes

The first code displayed during the KOER SELF-TEST is an engine identification code. They indicate the number of cylinders in the engine. An engine ID Code of 2 (20), 3 (30), or 4 (40) indicates 4, 6, or 8 cylinder engines, respectively.

Dynamic Response or Wide Open Throttle (WOT) Check

Allows the ECA to check the TP, VAF and MAP sensors. This test is accomplished by a brief opening of the throttle to the full open position. It is also called the "Goose" test. It is requested by a single pulse or Code 10 approximately 6-20 seconds after the engine identification codes are displayed.

Special Notes

When preparing to perform the Key On Engine Off (KOEO) self-test. Be aware of the following conditions

1. If the engine starts but stalls, or stalls during Self-Test. Go to «TEST D19 - SYSTEM CHECK»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d19-system-check) , step 1).
2. On vehicles equipped with the Brake On/Off Switch (BOO), the brake pedal MUST be depressed and released AFTER the ID code.
3. On vehicles equipped with the Power Steering Pressure Switch (PSPS), within 1 to 2 seconds after the ID code, the steering wheel must be turned at least one-half turn and released. On vehicles equipped with E40D transmission, the Overdrive Cancel Switch (OCS) must be cycled after the ID code.
4. On vehicles equipped with E40D transmission, the Overdrive Cancel Switch (OCS) must be cycled after the ID code.
5. The Dynamic Response code is a single pulse (or a 10 code on the Scan Tester) that occurs 6-20 seconds after the engine running identification code. See «DYNAMIC RESPONSE OR WIDE OPEN THROTTLE (WOT) CHECK»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__dynamic-response-or-wide-open-throttle) .
6. When the Dynamic Response code occurs, perform a brief wide-open throttle.
7. Code Output [Engine ID-Dynamic Response-Engine Running] display description. Example: for a code display of 2(0)-1(0)-11, the first number 2 is Engine ID, this 2 indicates a four cylinder. The second number is a Dynamic Response code 10, and the third number is a Engine Running code 11. Also, see «ENGINE ID CODES»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__engine-id-codes) .

Test Procedure

Note. This test procedure has been revised due to Ford Technical Service Bulletin 89-18A-10.

1. Deactivate Self-Test by disconnecting STI jumper wire. Start and run engine at 2000 RPM for 2 minutes to warm up HEGO sensor. Turn engine off and wait 10 seconds
2. Activate "Self-Test". See «KEY ON ENGINE OFF (KOEO) SELF-TEST»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) .
3. Start engine. The engine ID code will be displayed. On vehicles equipped with Brake On/Off switch (BOO), the brake pedal MUST be depressed and released AFTER the ID code (within 1-2 seconds). On vehicles equipped with Power Steering Pressure Switch (PSPS), the steering wheel MUST be turned one-half turn and released AFTER the ID code. On vehicles equipped with an Overdrive Cancel Switch (OCS) the switch must be cycled AFTER the ID code.
4. If a Dynamic Response code occurs, briefly depress accelerator pedal to Wide Open Throttle (WOT). A Dynamic Response code is a Code 1 or 10 displayed after the Engine ID code and before the Engine Running codes. DO NOT depress throttle during test unless a Dynamic Response code occurs. The KOER Self-Test service codes will then be displayed. Observe and record all codes.

Test Procedure (Code Output)

Code Output, indications and actions to be taken.

1. Code Output [Eng. ID(0)-1(0) or No display-11] KOER Self-Test indicates a PASS. Action to take: If Continuous Memory Codes were present, Go to «CONTINUOUS SELF TEST»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) . If Continuous Memory is a PASS Code 11 and a symptom is present, Go to «DIAGNOSIS BY SYMPTOM»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__diagnosis-by-symptom) .
2. Code Output [Eng. ID(0)-1(0) or No Display-11] KOER Self-Test indicates a FAULT. Action to take: Go to KOER service codes. See «KEY ON/ENGINE RUNNING CIRCUIT TEST MENU»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) under KOER CODE/TEST MENU. Always start with the first code displayed.
3. Code Output [98-No Display-Any Code(s)] Code 98 in place of the I.D. code indicates that the vehicle is in FMEM (Failure Mode Effects Management), see «FAILURE MODE EFFECTS MANAGEMENT (FMEM), CODE 98»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__failure-mode-effects-management-fmem-code) under DIAGNOSTIC AIDS. Key On Engine Off (KOEO) Self-Test DID NOT PASS. Engine Running Self-Test will not initiate until a PASS Code 11 is obtained in KOEO Self-Test. Action to take: Perform Key On Engine (KOEO) Off Self-Test and address all codes displayed. Go to «KEY ON ENGINE OFF (KOEO) SELF-TEST»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) . Always start with the first code displayed.
4. Code Output [No Code Display-Codes Not Listed] Indicates Self-Test did not activate. Action to take: Rerun Key On Engine Running Self-Test to verify the above condition. If condition is still present. Go to «TEST D14 - NO CODES»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d14-no-codes) .

KOER CODE/TEST MENU

KEY ON/ENGINE RUNNING CIRCUIT TEST MENU

1. Verify that a PASS 11 was received in both Key On Engine Off (KOEO) and Key On Engine Running (KOER) Self-Tests before continuing with this test.
2. Refer to «CONTINUOUS MEMORY MONITOR MODE»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__continuous-memory-monitor-mode) for a detailed description of how to use the Continuous Monitor Mode.
3. If Continuous Memory is a PASS code 11 and a symptom is present. GO to «DIAGNOSIS BY SYMPTOM»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__diagnosis-by-symptom) .

Determining The Continuous Memory Codes To Be Serviced

1. Refer to the Continuous Memory Codes recorded from KOEO Self-Test.
2. The cause of some of the Continuous Memory Codes may have been eliminated during either Key On Engine Off or Engine Running Self-Test service.
3. Address only those Continuous Memory Codes for which faults have not been previously serviced. If the fault has been serviced in KOEO Self-Test for Computed Timing Check. Clear Continuous Memory Codes.
4. Go to service codes table of Continuous Self-Test. See «CONTINUOUS SELF-TEST CIRCUIT TEST MENU»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) .

CONTINUOUS MEMORY MONITOR MODE

The Continuous Monitor Mode allows a technician to attempt to recreate an intermittent fault while monitoring the system. This mode, also called the "Wiggle" test, may be used in both KOEO and KOER modes. The CIRCUIT TESTS specify the use of this procedure to identify intermittent faults in specific circuits or components.

KOEO "Wiggle" Test Procedure

Connect test equipment. See TEST EQUIPMENT HOOK-UP . Turn ignition on and activate Self-Test with jumper lead or diagnostic tester. Wait 10 seconds, deactivate, and then reactivate Self-Test. You are now in "Wiggle" test mode. Tap, move, and wiggle the suspected sensor and/or harness area. If a fault is detected, a service code may be stored in memory and indicated at the diagnostic tester or scan tool. Record or retrieve code and perform test indicated in CONTINUOUS SELF-TEST CIRCUIT TEST MENU table.

KOER "Wiggle" Test Procedure

Connect test equipment. See TEST EQUIPMENT HOOK-UP . Turn ignition off and wait 10 seconds. Start engine. Activate Self-Test with jumper lead or diagnostic tester. Wait 10 seconds, deactivate, and then reactivate Self-Test. DO NOT turn engine off. You are now in engine running "Wiggle" test mode. Tap, move, and wiggle the suspected sensor and/or harness area. If a fault is detected, a service code may be stored in memory and indicated at the diagnostic tester or scan tool. Record or retrieve code and perform test indicated in CONTINUOUS SELF-TEST CIRCUIT TEST MENU table.

CONTINUOUS CODE MENU

CONTINUOUS SELF-TEST CIRCUIT TEST MENU

DIAGNOSIS BY SYMPTOM

DIAGNOSIS BY SYMPTOM INDEX

DIAGNOSTIC AIDS

A number of additional diagnostic test features are available to aid in diagnosis of driveability problems.

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 command. This mode is entered from the KOEO SELF-TEST after all codes have been received. At this time, leave SELF-TEST activated and depress throttle to initiate the test sequence. Each time throttle is depressed and released, the output actuators will change state (go from on to off, or off to on).

Failure Mode Effects Management (FMEM), Code 98

The FMEM mode allows system operation when one or more sensors fail or transmit signals which are out of their normal operating range. The ECA will substitute a mid-range signal for the defective sensor and continue to monitor the sensor. If the faulty sensor signals return to within the normal operating range the ECA will use those signals. A Code 98 will be displayed when the FMEM mode is in effect.

7.5L (Except With E4OD) Service Code Definitions. Scheme 221

7.5L (With E4OD) Service Code Definitions (1 of 2). Scheme 222

7.5L (With E4OD) Service Code Definitions (2 of 2). Scheme 223

Note. The following tests, circuits and illustrations are supplied courtesy of Ford Motor Co.

Note. CIRCUIT TESTS are grouped in the following categories.

1. A1-A3 Preliminary Tests
2. B1-B17 Input Sensor Tests
3. C1-C2 Fuel Control Systems
4. D1-D25 ECA Output Tests

HOW TO USE CIRCUIT TESTS

1. DO NOT perform any CIRCUIT TEST unless directed to do so by a QUICK TEST procedure. Ensure all non-EEC related faults are corrected. FOLLOW EACH TEST STEP IN ORDER UNTIL FAULT IS FOUND. DO NOT replace any part unless directed to do so. When more than one service code is received, start with the first code displayed.
2. CIRCUIT TESTS require that you prove the electrical circuits are okay before you replace sensors or any other components. Always test circuits for continuity between the sensor and the ECA. Test all circuits for shorts to power, opens, or shorts to ground. Voltage Reference (VREF) and Voltage Power (VPWR) circuits should be tested with KOEO or as specified in CIRCUIT TESTS.
3. DO NOT measure voltage or resistance at ECA or connect any test light, unless specified in testing procedure. All measurements are made by probing REAR of connector. Isolate both ends of a circuit and turn key off whenever checking for shorts or continuity, unless specified. NOTE: When directed in testing procedure to service or repair TFI ignition system, see «IGNITION SYSTEM»(/ford/club-wagon-e150/1987-1991/remont/ignition-system/#ignition-system) article in ENGINE section.
4. Disconnect solenoids and switches from harness before measuring continuity, resistance, or applying voltage. After each repair, check all component connections and repeat CIRCUIT TEST.
5. An "open" is defined as any resistance reading greater than 5 ohms. This specification tolerance may be too high for some items in the EEC-IV system. If resistance approaches 5 ohms, always clean the suspected connector and coat with protective dielectric silicone grease. A "short" is defined as any resistance reading less than 10K ohms to ground, unless otherwise specified in CIRCUIT TEST.
6. On FUEL CONTROL CIRCUIT TESTS C1, and C2, to prevent replacement of good components, be aware that the following non-EEC related areas may also be at fault. These areas include ignition coil, distributor cap and rotor, spark plug wires, fouled spark plugs, canister purge problems, 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.
7. On FUEL CONTROL CIRCUIT TESTS C1, and C2, vacuum leaks in non-EEC related areas may also cause code 41 or 91 to be displayed. Check for unmetered air leaks between airflow meter and throttle body, leaking vacuum motors, engine seals, EGR system, PCV system, Canister Purge (CANP) problems, or contaminated HEGO sensor. Code 42 or 92 may be caused by fuel contaminated engine oil, ignition misfire, EGR system, or CANP problems.

Diagnostic Procedures Sequence Flow Chart. Scheme 224

TEST A1 - NO START

To prevent replacement of good components, ensure that the following non-EEC related areas are not at fault: fuel quantity and quality, ignition system damage, cracks, moisture, etc., engine mechanical conditions such as bad valves, timing belt, etc. Also included are starter and battery circuit problems.

Scheme 225

1. Starting System. Try to start engine. If engine does not crank, check vehicle starting and charging systems. Ensure fuel pump inertia switch is set (button pushed in). If engine cranks, but does not start or stalls after starting, go to next step.
2. Checking VREF Signal at TPS. 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 (KOEO). Measure voltage at TPS harness connector between VREF and SIGNAL RETURN. (Scheme 225)or appropriate wiring diagram. If reading is less than 4 volts or more than 6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If reading is between 4 and 6 volts, reconnect TPS and go to next step. (Scheme 225): TFI Module Circuit Diagram
3. Checking For Spark At Plugs. Disconnect any spark plug wire. Connect a spark tester between plug wire and engine ground. Crank engine. If spark exists, connect spark plug wire and go to step 12). If no spark, connect spark plug wire and go to next step.
4. Checking For Spark at Coil. 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 no spark exists, connect coil wire and go to next step.
5. Ignition Ground Continuity. Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Disconnect TFI connector. Measure resistance between test pin 16 of the breakout box and TFI harness connector Ignition Ground circuit. If reading is greater than 5 ohms, repair harness and repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
6. Isolating SPOUT Circuit Fault. Install breakout box and connect TFI connector. Connect distributor Hall connector. Connect ECA to breakout box. Set breakout box switch to "DISTRIBUTOR" position. Try to start vehicle. If vehicle starts, go to step 10). If vehicle does not start, go to next step.
7. Checking SPOUT Signal. Connect breakout box and ECA. Move breakout box timing switch to "COMPUTED" position. Turn key on with engine off. Set DVOM on 20-volt scale and measure voltage between test pin No. 36 of breakout box and negative battery post while cranking engine. If voltage is between 3 and 6 volts, EEC system is NOT at fault. TFI ignition system should be diagnosed. If voltage is not between 3-6 volts, go to next step.
8. Checking SPOUT and PIP For Shorts. Turn key off and wait 10 seconds. Install breakout box and disconnect ECA. Disconnect TFI and Hall connector. Set DVOM on 200K-ohm scale. For SPOUT circuit, measure resistance between test pin No. 36 (SPOUT) and test pins No. 16, 20, 40, 46, and 60 (short to ground), Nos. 26, 37 and 57 (short to power) and then No. 56 (short to PIP) at the breakout box. For PIP circuit, measure resistance between test pin No. 56 and test pins No. 16, 20, 40, 46, and 60 (short to ground), Nos. 26, 37 and 57 (short to power) and No. 36 (short to SPOUT). If any reading is less than 10K ohms, repair short in harness, reconnect components and repeat QUICK TEST. If engine still does not start, go to next step. If all readings are greater than 10K ohms, go to next step.
9. Isolating Shorts In Processor. Turn key off and wait 10 seconds. Install breakout box and connect ECA to breakout box. Disconnect TFI and Hall connector. Set DVOM on 200K ohm scale. On SPOUT circuit, measure resistance between test pin No. 36 (SPOUT) and test pins No. 37 and 57 (short to power) and Nos. 40 and 60 (short to ground) at the breakout box. On PIP circuit, measure resistance between test pin No. 56 (PIP) and test pins No. 37 and 57 (short to power) and Nos. 40 and 60 (short to ground) at the breakout box. If any reading is less than 500 ohms, remove breakout box, replace ECA and repeat QUICK TEST. If all readings are greater than 500 ohms, reconnect all components and go to next step.
10. Checking PIP Signal. With key off, install breakout box. Set DVOM on 20-volt scale. Measure voltage between test pins No. 56 and 16 at breakout box. Crank engine and record reading. If reading is between 3 and 7 volts, remove breakout box, replace ECA and repeat QUICK TEST. If reading is not between 3-7 volts, switch breakout box timing switch to "COMPUTED" position and go to next step.
11. Continuity of PIP Circuit. Turn key off and wait 10 seconds. Install breakout box and disconnect ECA. Disconnect TFI and Hall connector. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 56 at breakout box and TFI connector PIP circuit. If reading is not less than 5 ohms, repair open PIP circuit, remove breakout box and repeat QUICK TEST. If readings is less than 5 ohms, remove breakout box, reconnect all components and go to next step.
12. Verifying SPOUT Signal. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for damaged pins, corrosion, or loose wires. Repair as necessary. Install breakout box and connect ECA to breakout box. Switch breakout box timing switch is in "COMPUTED" position. Set DVOM on 20-volt scale. Measure voltage between test pin No. 36 and test pins No. 40 and 60 at breakout box, while cranking engine. If reading is between 3-6 volts, go to next step. If reading is not between 3-6 volts, go to step 8). CAUTION: Use safety precautions when working on fuel system. No smoking or open flame. If fuel starts leaking, immediately turn key off.
13. Fuel Pump Check. Connect pressure gauge to vehicle. Note initial pressure reading. Pressurize fuel system by turning key to "RUN" for one second and note pressure reading. Turn key off, and wait 10 seconds. Repeat sequence 5 times. If pressure increased, go to «TEST D19 - SYSTEM CHECK»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d19-system-check), step 1). If pressure did not increase, turn key off and go to next step.
14. Inertia Switch Check. Locate and disconnect fuel pump inertia switch. Set DVOM on 200-ohm scale. Measure resistance of switch. If resistance is greater than 5 ohms, ensure inertia switch is reset. If switch will not reset, replace switch, remove breakout box, reconnect components and repeat quick test. If resistance is less than 5 ohms, go to «TEST C2 - INERTIA SWITCH»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-c2-inertia-switch), step 1)

TEST A2 - VEHICLE BATTERY

Note. Perform this test when directed here by TEST A3 - REF. VOLTAGE, C2, or D13 test procedures.

Vehicle Battery Circuits Diagram. Scheme 226

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, alternator, or ignition switch. This test is intended to diagnose the ECA, power relay, battery voltage and the following harness circuits

1. Signal Return
2. STO
3. STI
4. Ground
5. VPWR
6. KAPWR
7. VREF
8. Ignition

1. Battery Voltage Check. Turn key on with engine off. Set DVOM on 20-volt scale and measure voltage across battery terminals. If reading is less than 10.5 volts, charge or replace battery. If reading is greater than 10.5 volts, go to next step.
2. Checking EEC Ground Circuit. Turn key off and wait 10 seconds. Inspect ECA connector and pins. Install breakout box and connected ECA to breakout box. Set DVOM on 200-ohm scale and measure resistance between test pin No. 40 of breakout box and negative post on battery. Also measure resistance between test pin No. 60 of breakout box and negative post on battery. If greater than 5 ohms, remove breakout box, reconnect ECA and repair open EEC ground circuit. Repeat QUICK TEST. If both readings are less than 5 ohms, go to next step.
3. Checking ECA Ground Insolation. Turn key off and wait 10 seconds. Install breakout box and connect ECA to it. Set DVOM on 200 ohm scale. Measure resistance between test pins No. 46 and 40 and between test pins No. 46 and 60 at breakout box. If both readings are less than 5 ohms, go to next step. If readings are greater than 5 ohms, disconnect ECA connector and inspect for corrosion or damaged pins. Repair if necessary. If fault is still present, replace ECA and repeat quick test.
4. Checking Continuity of Signal Return Circuit. 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 No. 46 at breakout box and signal return circuit in SELF-TEST connector. If reading is greater than 5 ohms, repair open circuit and repeat quick test. If reading is less than 5 ohms, go to next step.
5. Checking KAPWR Circuit. Turn key on with engine off. Install breakout box and connect ECA. Set DVOM on 20-volt scale. Measure voltage between battery negative post and test pin No. 1 at breakout box. If reading is less than 10.5 volts, check KAPWR and VPWR circuits for shorts to ground. Also check KAPWR circuit from EEC power relay to battery positive post for open circuit. Remove breakout box, reconnect ECA and repeat quick test. If reading is 10.5 volts or more, go to next step.
6. Ignition Circuit Voltage. Turn key on, leaving engine off. With breakout box and ECA connected, set DVOM on 20-volt scale. Measure voltage between battery negative post and ignition circuit at EEC power relay. If reading is less than 10.5 volts, check for open ignition switch circuits. Repair wiring and repeat QUICK TEST. If reading is 10.5 volts or more, go to next step.
7. Checking EEC Power Relay Ground Circuit. Turn key off and wait 10 seconds. Install breakout box and connect ECA. Set DVOM on 200-ohm scale. Measure voltage between battery negative post and EEC relay ground. If reading is greater than 5 ohms, repair wiring in ground circuit. Repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
8. Checking Power Circuit (VPWR) At EEC Power Relay. Turn key on, leaving engine off. Install breakout box and connect ECA. Set DVOM on 20-volt scale, measure voltage between battery negative post and VPWR circuit at EEC power relay. If reading is 10.5 volts or greater, repair open in VPWR circuit. If VPWR circuit is okay, repair short to ground in VPWR circuit. If reading is less than 10.5 volts, replace EEC power relay. Repeat quick test.

TEST A3 - REF. VOLTAGE

Note. Perform this test when check of VREF circuit has failed, or directed here by a sensor test or other CIRCUIT TEST.

Reference Voltage Circuits. Scheme 227

1. Checking Battery Power Circuit. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Install breakout box and connect ECA to it. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between test pin No. 37 of breakout box and SIGNAL RETURN in SELF-TEST connector. If reading is less than 10.5 volts, go to «TEST A2 - VEHICLE BATTERY»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a2-vehicle-battery) , step 1). If reading is 10.5 volts or more, go to next step.
2. Checking VREF Voltage. With breakout box installed and connect ECA to it. Turn key on, leaving engine off. Set DVOM on 20 volt scale and measure voltage between test pins No. 26 and 46 of breakout box. If reading is 6 volts or more, go to step 4). If reading is 4 volts or less, go to step 5). If reading is between 4 and 6 volts, go to next step.
3. VREF and Signal Return Continuity. With breakout box installed and ECA disconnected, turn key off. If directed here by a sensor test, ensure that sensor is disconnected. Set DVOM on 200-ohm scale. Measure resistance from test pin No. 26 of breakout box to VREF at harness connector of the sensor that sent you to this test. Measure resistance from test pin No. 46 of breakout box to signal return at harness connector of the sensor that sent you to this test. If both readings are less than 5 ohms, VREF voltage is okay. Reconnect components and repeat quick test. If any reading is 5 ohms or more, repair open circuit in VREF or signal return circuit. Remove breakout box, reconnect components and repeat quick test.
4. Checking For Excess VREF Circuit Voltage. 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 No. 26 of breakout box and battery ground. If reading is less than 0.5 volt, replace ECA and repeat QUICK TEST. If reading is 0.5 volt or more, repair short to battery power in EEC harness. Repeat QUICK TEST. 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 TPS from vehicle harness. Turn key on, leaving engine off. Set DVOM on 20-volt scale and measure voltage between test pins No. 26 and 46 of breakout box. If reading is 4 volts or more, replace TPS and repeat QUICK TEST. If less than 4 volts on models with EVP/PFE sensor, go to next step. If reading is less than 4 volts on all other models, go to step 7).
6. Shorted EVP/PFE Sensor. Turn key off and wait 10 seconds. With breakout box installed and ECA connected, disconnect EVP/PFE sensor. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between test pins No. 26 and 46 of breakout box. If reading is 4 volts or more, replace EVP/PFE sensor and repeat QUICK TEST. If reading is less than 4 volts, go to next step.
7. 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 pins No. 26 and 46 of breakout box. If reading is 4 volts or more, replace MAP/BP sensor and repeat QUICK TEST. If reading is less than 4 volts on models without Vane Airflow (VAF) sensor, go to step 9). If reading is less than 4 volts on models with VAF sensor, go to next step.
8. Shorted VAF Sensor. Turn key off and wait 10 seconds. With breakout box installed and ECA connected, disconnect VAF sensor. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between test pins No. 26 and 46 of breakout box. If reading is 4 volts or more, replace VAF sensor and repeat QUICK TEST. If reading is less than 4 volts, go to next step.
9. VREF Shorted to Ground. With breakout box installed and ECA disconnected, turn key off and wait 10 seconds. Disconnect TPS, MAP/BP, EVP/PFE, and VAF sensor (if equipped). Set DVOM on 200-ohm scale. Measure resistance between test pin No. 26 and test pins No. 20, 40, 46, and 60 of breakout box. If any resistance is less than 5 ohms, repair short to ground, connect all sensors and repeat QUICK TEST. If original problem still occurs, replace ECA and repeat QUICK TEST. If reading is 5 ohms or more, connect sensors, replace ECA and repeat QUICK TEST.

TEST B1 - VAT SENSOR

Note. Perform this test only when service code 24, 28, 54, 58, 64, or 68 is received in QUICK TEST. Ambient air temperature must be at least 50°F (10°C) for test results to be valid. Avoid performing test in unusually hot or cold conditions.

VAT Sensor Circuit. Scheme 228

VANE AIR TEMPERATURE (VAT) SENSOR SPECIFICATIONS

1. Code 24 or 28: Check Ambient Temperature. Codes 24 and 28 indicate that the VAT sensor is out of Self-Test range. Correct range for measurement is.35-3.5 volts. Possible causes are; low ambient temperature, Faulty VAF meter, faulty ECA, faulty wiring or connector. Ensure ambient air temperature is at least 50°F (10°C). If not, repeat QUICK TEST. If temperature is at least 50°F (10°C), go to next step.
2. Check For VREF at TPS. 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 SIG RTN. If reading is not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If voltage is 4-6 volts, connect TPS and go to next step.
3. Checking VAT Sensor. Ensure ambient temperature is greater than 50°F. Turn key off and wait 10 seconds. Disconnect harness from vane meter. Set DVOM on 200K-ohm scale. Measure resistance at VAT sensor between VAT SIG and SIG RTN. (Scheme 228) If resistance is 125 ohms at 240°F (116°C) to 3700 ohms at 50°F (10°C), replace ECA. Connect vane meter and repeat QUICK TEST. If reading is out of range, remove vane meter. Spray carburetor cleaner on a clean cloth and pass cloth through meter to remove oil film buildup. DO NOT spray inside vane meter. Reinstall vane meter. Repeat quick test. If code is still present, replace vane meter and repeat QUICK TEST.
4. Code 54 or 58: Induce Opposite Code. Code 54 and 58 indicate VAT sensor signal is greater than the Self-Test maximum of 3.5 volts (temperature is too low). Possible causes are a lack of continuity between the vane meter harness connector and ECA, a faulty vane meter, or a faulty ECA. Turn key off and wait 10 seconds. Disconnect harness from vane meter. Inspect and repair any damaged wiring. Install a jumper wire between VAT SIG and SIG RTN at vane meter harness connector. Perform KOEO SELF-TEST. If Code 64 or 68 is displayed, replace vane meter, remove jumper wire, reconnect vane meter, and repeat QUICK TEST. If code 64 or 68 is not displayed, remove jumper wire and go to next step.
5. Checking Continuity of VAT Signal and Signal Return. Turn key off and wait 10 seconds. Disconnect vane meter and keep jumper wire removed. 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 No. 25, at the breakout box and VAT SIG at vane meter harness connector. Also measure resistance between test pin No. 46 and SIG RTN at vane meter harness connector. If both readings are less than 5 ohms, replace ECA. Remove breakout box and connect wiring to ECA and vane meter. Repeat QUICK TEST. If either reading is 5 ohms or more, repair open circuit. Remove breakout box, connect wiring to ECA and vane meter. Repeat QUICK TEST.
6. Code 64 or 68: Opposite Code Test. Service Code 64 or 68 indicates VAT sensor signal is less than Self-Test minimum value of 0.35 volts (Temperature is too High). Possible causes are, VAT signal output shorted to SIG RTN, ground, or VREF. A faulty vane meter or ECA. Turn key off and wait 10 seconds. Disconnect harness from vane meter. Inspect for and repair any damaged wiring. Perform KOEO SELF-TEST. If Code 54 or 58 is displayed, replace vane meter and reconnect harness. Repeat QUICK TEST. If Code 54 or 58 is not displayed, go to next step.
7. Checking VREF at TPS. Turn key off and wait 10 seconds. Disconnect TPS. Set DVOM on 20-volt scale. Turn key on, leaving engine off. Measure voltage between VREF and SIG RTN at TPS harness connector. If reading is not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If reading is 4-6 volts, connect TPS and go to next step.
8. Checking VAT Signal For Shorts. Turn key off and wait 10 seconds. Disconnect vane meter. Disconnect ECA 60-pin connector. Inspect and repair as necessary. Install breakout box, with ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 25 and test pins No. 40, 46, and 60 of breakout box. If any reading is less than 10K ohms, repair shorts in circuit(s). Remove breakout box, connect ECA and vane meter. Repeat QUICK TEST. If all readings are greater than 10K ohms, replace ECA. Remove breakout box and connect ECA. Repeat QUICK TEST.
9. Continuous Code 54 or 58: VAT Sensor Check. A Continuous Memory Code 54 or 58 indicates that the VAT signal was greater than the Self-Test maximum of 4.5 volts. The code was set during normal driving conditions. Possible causes are, faulty harness or connectors, ECA or vane meter. Enter KOEO CONTINUOUS MONITOR (WIGGLE) TEST. Observe VOM or diagnostic tester for indication of fault while lightly tapping vane meter and then by wiggling connector. If fault is indicated, inspect connector and terminals and repair or replace as necessary. If connector and terminals are good, replace vane meter and repeat QUICK TEST. If a fault is not indicated, go to next step.
10. EEC-IV Harness Check. While in CONTINUOUS MONITOR (WIGGLE) TEST, wiggle and bend EEC-IV harness from VAT sensor to instrument panel, a small section at a time. Also check harness from instrument panel to ECA. If fault is indicated, isolate fault and repair as necessary. Repeat QUICK TEST. If no fault is found, go to next step.
11. Checking ECA Harness and Connectors. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connector and connector terminals for obvious damage. If connectors and terminals are damaged, repair or replace as necessary and repeat QUICK TEST. If connectors and terminals are okay, and you are unable to duplicate fault at this time, clear codes and repeat QUICK TEST.
12. Continuous Memory Codes 64 or 68: VAT Sensor Check. A Code 64 or 68 indicates VAT signal was less than Self-Test minimum of 0.3 volt. The code was set during normal driving conditions. Possible causes for this fault: faulty harness or connectors, ECA or VAF meter. Enter KOEO CONTINUOUS MONITOR (WIGGLE) TEST, observe VOM or diagnostic tester for indication of fault while tapping VAT sensor lightly and wiggling connector. If fault is indicated, inspect connector and terminals. If connector and terminals are good, replace vane meter and repeat QUICK TEST. If no fault is indicated, repeat steps 10) and 11).

TEST B2 - ACT SENSOR

Note. Perform this test when Service Code 24, 54, or 64 is displayed during QUICK TESTS or when directed here by other test procedures.

Air Charge Temperature (ACT) Sensor Circuit. Scheme 229

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: cooling system, improper engine oil level, or air cleaner duct problems. Ambient air temperature must be at least 50°F (10°C) for test results to be valid. Avoid performing test in unusually hot or cold conditions.

AIR CHARGE TEMPERATURE (ACT) SENSOR SPECIFICATIONS

1. Service Code 24: Checking ACT Sensor. Code 24 indicates that the ACT is out of the Self-Test limit range. Correct range for Self-Test measurement is 0.3-3.7 volts. Possible causes for this code are: ACT resistance out of limits or a faulty ECA. For vehicles with ACT sensor mounted in intake manifold, go to next step. If sensor is properly mounted in air cleaner on all other models, go to next step. If sensor is not properly mounted, install ACT sensor properly and repeat QUICK TEST.
2. Checking VREF at TPS. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale and disconnect TPS. With KOEO, measure voltage between VREF and SIG RTN at TPS harness connector. If reading is less than 4 volts or more than 6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage) . VOLTAGE, step 1). If reading is between 4 and 6 volts, connect TPS and go to next step.
3. Checking ACT With Engine Off. Start engine and ensure engine reaches normal operating temperature. Turn key off and wait 10 seconds. Disconnect ACT sensor, set DVOM on 200K-ohm scale and measure ACT sensor resistance. If reading is less than 1100 ohms or more than 58K ohms, check function of heat stove duct valve. If valve is operating correctly, replace ACT sensor. Connect ACT sensor, and repeat QUICK TEST. If reading is between 1100 and 58K ohms, go to next step.
4. Checking ACT With Engine Running. Turn key off. Disconnect ACT sensor harness. Set DVOM on 200K-ohm scale and run engine for 2 minutes. While engine is running, measure ACT sensor resistance. If reading is between 2400 and 29K ohms, replace ECA. Connect ACT harness, and repeat QUICK TEST. If reading is less than 2400 ohms or more than 29,000 ohms, check function of heat stove duct valve. If valve works properly, replace ACT sensor. Repeat QUICK TEST.
5. Code 54: Generate Code 64. Code 54 indicates the ACT signal is greater than the Self-Test maximum value of 4.6 volts, which could also indicate an open circuit. Possible causes for this code are, open in harness wiring, faulty ACT sensor or faulty ECA. Turn key off and wait 10 seconds. Disconnect ACT sensor harness. Inspect for and repair any damaged wiring. Install a jumper wire between ACT SIGNAL and SIGNAL RETURN at connector. Perform KOEO SELF-TEST. If code 64 is displayed, replace ACT sensor. Remove jumper wire, connect ACT sensor, and repeat QUICK TEST. If code 64 is not displayed, remove jumper wire and go to next step.
6. Continuity Check of ACT Signal and Signal Return. Turn key off and wait 10 seconds. Leave ACT sensor harness disconnected. 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 No. 25 and ACT SIGNAL at ACT connector, and between test pin No. 46 and SIGNAL RETURN at ACT connector. If both readings are less than 5 ohms, replace ECA and remove breakout box. Connect ECA and ACT sensor, and repeat QUICK TEST. If either reading is 5 ohms or more, repair opens in circuit. Remove breakout box, and connect ECA and ACT sensor. Repeat QUICK TEST.
7. Code 64: Generate Code 54. Code 64 indicates that the ACT signal is less than the Self-Test minimum value of 0.2 volt (grounded circuit). Possible cause for this fault are, faulty ACT sensor, short to ground in harness, faulty ECA. Turn key off and wait 10 seconds. Disconnect ACT sensor. Inspect for and repair any damaged wiring. Perform KOEO SELF-TEST. If code 54 is displayed, replace ACT sensor. Connect harness, and repeat QUICK TEST. If code 54 is not displayed, go to next step.
8. Checking VREF at TPS. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale and disconnect TPS. Turn key on, leaving engine off. Measure voltage at TPS harness connector between VREF and SIGNAL RETURN at TPS connector (refer to wiring diagram for TEST B8 - TPS). If reading is less than 4 volts or more than 6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage) . VOLTAGE, step 1). If reading is between 4 and 6 volts, connect TPS and go to next step.
9. Checking ACT Signal for Ground Short. Turn key off and wait 10 seconds. Disconnect harness at ACT sensor. Disconnect ECA 60 pin connector. Inspect for and repair any damaged wiring. Install breakout box and set DVOM on 200K-ohm scale. Measure resistance between test pin No. 25 and test pins No. 40, 46, and 60. If any reading is less than 10K ohms, repair shorts. Remove breakout box, and connect ECA and ACT sensor. Repeat QUICK TEST. If all readings are 10K ohms or more, replace ECA. Remove breakout box, and connect ECA and ACT sensor. Repeat QUICK TEST.
10. Continuous Memory Code 54: Check ACT Sensor. Code 54 indicates that the ACT signal was greater then the Self-Test maximum value sometime during vehicle operation. Possible causes for this fault are; faulty ACT sensor, open in harness or faulty ECA. Using KOEO CONTINUOUS MONITOR (WIGGLE) TEST, observe VOM or diagnostic tester for indication of fault while tapping ACT sensor lightly and wiggling connector. If fault is indicated, inspect connector and terminals. If connector and terminals are good, replace ACT sensor and repeat QUICK TEST. If no fault is indicated, go to next step.
11. Wiggle Testing ACT Harness. While in CONTINUOUS MONITOR (WIGGLE) TEST, wiggle and bend small sections of harness from ACT sensor to firewall. Repeat action from firewall to ECA. If fault is indicated, isolate fault and repair as necessary. Clear continuous memory codes and repeat QUICK TEST. If no fault is indicated, go to next step.
12. Inspecting Connectors and Terminals. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connector and connector terminals for obvious damage. If connectors and terminals are not okay, repair as necessary, clear continuous memory code and repeat QUICK TEST. If connectors and terminals are okay, and you are unable to duplicate fault at this time, clear continuous memory and repeat QUICK TEST.
13. Continuous Memory Code 64: Check ACT Sensor. Code 64 indicates that the ACT sensor signal was less than the Self-Test minimum value of 0.2 volt sometime during vehicle operation. Possible causes of this fault are; faulty ACT sensor, open in harness or faulty ECA. Using KOEO CONTINUOUS MONITOR (WIGGLE) TEST, observe VOM or diagnostic tester for indication of fault while tapping ACT sensor lightly and wiggling connector. If fault is indicated, inspect connector and terminals. If connector and terminals are good, replace ACT sensor and repeat QUICK TEST. If no fault is indicated, repeat step 11).

TEST B4 - EVP, EGRC, EGRV

Note. Perform this test when Service Code 31, 32, 33, 34, 35, 83, or 84 is displayed during QUICK TESTS or when directed here by other test procedures.

EVP, EGRC & EGRV Solenoid Circuits. Scheme 230

EVP SENSOR SPECIFICATIONS

To prevent replacement of good components, be aware that the following non-EEC related area may be at fault: damaged EGR valve.

1. KOER Service Code 31: Perform Engine Running Self-Test With EGR Vacuum Signal Line Disconnected at EGR Valve. Code 31 indicates that during KOER SELF-TEST, EVP sensor signal to ECA is out of range with the EGR valve closed. Possible causes are: a faulty EGRC/EGRV solenoids or a clogged EGRV filter. Turn key off and wait 10 seconds. Disconnect and plug vacuum line at EGR valve. Repeat KOER SELF-TEST. If Code 31 is not displayed, reconnect vacuum and go to step 8). If Code 31 is displayed, go to next step. Ignore all other service codes at this time.
2. KOEO Service Code 31: Checking EVP Resistance With Vacuum Applied To EGR Valve. Code 31 displayed during the KOEO SELF-TEST indicates that the EVP sensor signal to ECA is out of range with the EGR valve closed. Possible causes are: an open or shorted circuit, faulty EGR valve, faulty EVP sensor, or a faulty ECA. Turn key off and wait 10 seconds. Leave EGR vacuum line disconnected and plugged. Disconnect EVP sensor harness. Set DVOM on 200K-ohm scale and connect vacuum pump to EGR valve. Measure resistance at EVP sensor between EVP and VREF terminals while vacuum is slowly increased to 10 in. Hg. (Scheme 230) If reading is less than 100 ohms or more than 5500 ohms, replace EVP sensor. Connect vacuum line and harness. Repeat QUICK TEST. If reading does not decrease or valve does not hold vacuum, go to step 11). If reading gradually decreases from a maximum of 5500 ohms to a minimum of 100 ohms, go to next step.
3. Checking for VREF At The EVP. With KOEO, disconnect harness from EVP sensor. Set DVOM on 20-volt scale. Measure voltage between VREF and SIG RTN at EVP harness connector. (Scheme 230) If reading is not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If reading is 4-6 volts, go to next step.
4. Checking EVP Signal Circuit Continuity. Turn key off and wait 10 seconds. Disconnect harness at EVP sensor and ECA 60-pin connector. Inspect and repair as necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 27 at breakout box and EVP SIG at EVP harness connector. (Scheme 230) If reading is 5 ohms or more, repair open in circuit. Remove breakout box, connect ECA and EVP sensor, and repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
5. Checking EVP Signal for Shorts To VREF And SIG RTN. Turn key off and disconnect EVP sensor. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 27 and test pins No. 26, 40, 46, and 60 at breakout box. If any reading is less than 10K ohms, repair short circuit. Remove breakout box, connect ECA and EVP sensor. Repeat QUICK TEST. If all readings are 10K ohms or more, go to next step.
6. EVP Sensor and EGR Valve Substitution Test. Turn key off and wait 10 seconds. Connect known good EVP sensor and EGR valve assembly to harness and vacuum lines. Connect ECA to breakout box. Perform KOEO SELF-TEST. If code 31 is displayed, replace ECA. Connect original EVP sensor and EGR valve assembly. Repeat QUICK TEST. If Code 31 is not displayed, go to next step.
7. Testing EVP Sensor. Turn key off and wait 10 seconds. Ensure breakout box is installed and ECA connected to it. Use original EVP sensor on a known good EGR valve. Connect harness to EVP sensor and perform KOEO SELF-TEST. If Code 31 is displayed, replace EVP sensor and repeat QUICK TEST. If Code 31 is not displayed, remove breakout box, connect ECA and service EGR system.
8. Codes 32, 33, or 34 Displayed. Codes 32, 33 or 34 indicate that the EGR valve did not open when instructed to by the ECA. Code 34 indicates the valve would not open. Code 32 indicates unable to hold valve open. Code 33 indicates unable to close valve correctly. Possible causes are: faulty vacuum lines, clogged EGRV filter, faulty EVP sensor, EGR valve, EGRC/EGRV solenoid or ECA. With key off, disconnect vacuum line at EGR valve. Connect a vacuum gauge to the vacuum line, leaving the EGR valve disconnected. Observe vacuum gauge while running KOER SELF-TEST. Disregard all other codes produced during this test. If vacuum reading increased from less than one in. Hg to greater than 5 in. Hg, within 10 seconds and return to less than one in. Hg, go to step 10). If vacuum did not increase, remove vacuum gauge and go to next step. If vacuum increased but did not return to less than one in. Hg within 10 seconds, check EGRV filter for obstructions and replace as necessary. If filter is okay, replace solenoid assembly. Reconnect all vacuum lines and repeat QUICK TEST.
9. Checking Vacuum Supply to EGRC/EGRV Solenoids. With key off, disconnect vacuum source to EGRC/EGRV solenoids. Install a vacuum gauge at the source vacuum line. Start engine and check vacuum. If vacuum is greater than 10 in. Hg, check vacuum line from EGRC/EGRV solenoids to EGR valve for blockage, leaks or damage, repair or replace as necessary. If supply line is okay, replace solenoid assembly and repeat QUICK TEST. If vacuum was less than 10 in. Hg, check vacuum source to EGRC/EGRV solenoids and repair as necessary. Reconnect vacuum lines and repeat quick test.
10. Checking EVP Resistance. With key off, disconnect EVP sensor harness. Inspect for and repair any damaged wiring. Set DVOM on 200K-ohm scale. Disconnect vacuum line at EGR valve and connect vacuum pump to valve. Measure resistance of EVP sensor between EVP and VREF terminals while increasing vacuum to 10 in. Hg If resistance gradually change between 5500 ohms and 100 ohms, replace ECA. Reconnect EVP sensor and EGR vacuum line. Repeat QUICK TEST. If reading does not change as specified, go to next step.
11. Manual Test of EVP Sensor. With key off, disconnect EVP sensor harness. Remove EVP sensor and vacuum line from EGR valve. Measure resistance of EVP sensor at EVP and VREF terminal while sensor shaft is slowly pushed and slowly released. If resistance changes gradually between 5500 and 100 ohms, service EGR system. Reconnect EVP sensor and EGR vacuum line. Repeat QUICK TEST. If resistance did not change as specified, replace EVP sensor. Reconnect harness and EGR vacuum line. Repeat QUICK TEST. NOTE: It is normal for EVP sensor total resistance to drop to less than 100 ohms when disconnected from EGR valve. A defective sensor will change resistance suddenly between 5500 and 100 ohms.
12. Service Code 83 or 84: Checking EGRV/EGRC Solenoid Resistance. A Code 83 indicates an EGRC circuit failure. A Code 84 indicates an EGRV circuit failure. Possible causes are: an open or shorted circuit, faulty EGRC/EGRV solenoid or ECA. Turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Disconnect EGRV and EGRC solenoids from harness. Inspect and repair any damaged wiring. Measure resistance of both solenoids. If either reading is less than 30 ohms or more than 70 ohms, replace EGRC/EGRV solenoid assembly. Repeat QUICK TEST. If both readings are between 30 and 70 ohms, go to next step.
13. Check For VPWR At EGRC/EGRV Solenoids. Disconnect EGRC and EGRV solenoids from harness. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between battery negative terminal and VPWR circuit on both EGR solenoid harness connectors. (Scheme 230) If either reading is less than 10.5 volts, repair open circuit, reconnect solenoids and repeat QUICK TEST. If both readings are 10.5 volts or more, go to next step.
14. Continuity Check Of EGRC/EGRV Circuits. Turn key off and wait 10 seconds. Disconnect EGRC/EGRV solenoids. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 33 of breakout box and EGRV circuit at EGRV solenoid harness connector. (Scheme 230) Measure resistance between test pin No. 52 and EGRC circuit at EGRC solenoid harness connector. If either reading is 5 ohms or more, repair open circuit. Remove breakout box, reconnect components, and repeat QUICK TEST. If both readings are less than 5 ohms, go to next step.
15. Checking EGRC/EGRV Circuits For Short To Ground. Turn key off and wait 10 seconds. Set DVOM on 200K-ohm scale. Install breakout box, leaving ECA disconnected. Disconnect EGRC and EGRV solenoids. Measure resistance between test pin No. 33 and test pins No. 40, 46, and 60 of breakout box. Measure resistance between test pin No. 52 and test pins No. 40, 46, and 60. If any reading is less than 10K ohms, repair short to ground. Remove breakout box, reconnect components and repeat QUICK TEST. If all readings are 10K ohms or more, go to next step.
16. Checking For Shorts To Power. With key off, disconnect EGRC and EGRV solenoids from harness. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 33 and test pins No. 37 and 57 at breakout box. Measure resistance between test pin No. 52 and test pins No. 37 and 57 at breakout box. If any reading is less than 10K ohms, repair short in circuit. Remove breakout box, reconnect components and repeat QUICK TEST. If all resistances are greater than 10K ohms, replace ECA. Remove breakout box, reconnect components and repeat QUICK TEST.
17. Service Code 35: Check For Code 12. This code indicates that engine RPM was too low perform EGR test. Possible causes are: faulty ISC system or faulty ECA. If Code 12 is also displayed go to CIRCUIT TEST D5, step 1). If Code 12 is not displayed with Code 35, go to next step.
18. Retest at 1500 RPM. Turn key off and wait 10 seconds. Install tachometer. Perform KOER SELF-TEST at 1500 RPM. Ignore all other codes at this time. If code 35 is still displayed, replace ECA, clear codes and repeat QUICK TEST. If code 35 is not displayed, repeat QUICK TEST and repair any other codes as necessary.
19. Continuous Memory Code 31. Continuous Code 31 indicates that sometime during vehicle operation the EVP signal was out of the Self-Test range. Possible causes are: an open or shorted circuit or a faulty EVP sensor. Using KOEO CONTINUOUS MONITOR (WIGGLE) TEST, observe VOM or diagnostic tester for indication of fault while doing the following: connect vacuum pump to EGR valve. Very slowly apply 6 in. Hg vacuum to EGR valve. Bleed vacuum slowly and lightly tap on EVP sensor. Wiggle EVP sensor connector. If fault is indicated, go to next step. If no fault is indicated, go to step 21).
20. EVP Signal Voltage During Operation Of EVP Sensor. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box and connect ECA to it. Connect DVOM between test pins No. 27 and 46. Set DVOM on 20-volt scale. Re-enter KOEO CONTINUOUS MONITOR (WIGGLE) TEST. Monitor DVOM and repeat step 19). If fault occurs below 4.25 volts, disconnect EVP sensor from harness. Inspect for and repair any damaged wiring. If wiring is okay, replace EVP sensor. Clear continuous memory and repeat QUICK TEST. If fault does not occur below 4.25 volts, EGR valve overshoot may have caused Continuous Memory Code 31. Sensor test is complete. Go to next step for harness test.
21. Checking EEC-IV Harness. While in KOEO CONTINUOUS MONITOR (WIGGLE) TEST, bend, shake, and wiggle small sections of EEC-IV harness from sensor to firewall and from firewall to ECA. If fault is indicated, isolate fault and repair as necessary. Clear codes and repeat QUICK TEST. If no fault is indicated, go to next step.
22. Checking ECA and Harness Connectors. 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. If connector and terminals are okay, fault cannot be duplicated at this time. Continuous Code 31 testing is complete.

TEST B5 - ECT SENSOR

Note. Perform this test when directed to by a Code 21, 51, or 61 during QUICK TEST procedure. For purposes of this test, a "WARMED UP" engine has a coolant temperature of 50-240°F (10-116°C) for KOEO SELF-TEST and 180-240°F (82-116°C) for KOER SELF-TEST. The test procedure will be invalid outside these ranges.

Engine Coolant Temperature (ECT) Sensor Circuit. Scheme 231

ECT SENSOR SPECIFICATIONS

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 airflow, engine not at normal operating temperature, or cooling fan.

1. Service Code 21: Check Engine Operating Temperature. Code 21 indicates that the ECT is out of the 0.3-3.5 volt Self-Test range. Possible causes are: ECT resistance out of limits or faulty ECA. If engine will not start, go to step 4). Start engine and run at 2000 RPM for 2 minutes. Check that upper radiator hose is hot and pressurized. Repeat QUICK TEST before continuing. If vehicle stalls, DO NOT service code 21 at this time, go to «TEST D19 - SYSTEM CHECK»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d19-system-check). If code 21 is not displayed, service other codes as necessary. If code 21 appears, go to next step.
2. Checking for VREF at TPS. Turn key off and wait 10 seconds. Disconnect TPS. Set DVOM on 20-volt scale. With KOEO measure voltage at TPS harness connector between VREF and SIG RTN. (Scheme 231) If voltage is not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If voltage is 4-6 volts, reconnect TPS and go to next step.
3. ECT Sensor Resistance. Ensure engine is fully warmed up for this step. Turn key off and wait 10 seconds. Disconnect wiring harness at ECT sensor. Set DVOM on 200K-ohm scale and measure resistance of ECT sensor. If reading is 1300 ohms (240°F) to 7700 ohms (140°F) with engine off and 1550 ohms (230°F) to 4550 ohms (170°F) with engine running, replace ECA. Reconnect ECT sensor and repeat QUICK TEST. If readings are not as specified, replace ECT sensor, connect harness, and repeat QUICK TEST.
4. Checking ECT Sensor Resistance With A No Start Condition. With key off, disconnect ECT sensor and set DVOM on 200K-ohm scale. Measure resistance of ECT sensor and compare with above «ECT SENSOR SPECIFICATIONS»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) table. If resistance is within specifications, DO NOT service Code 21 at this time. Go to «TEST A1 - NO START»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a1-no-start). If resistance is not within specification, replace ECT sensor, connect ECT sensor and repeat quick test.
5. Service Code 51: Attempt To Generate Code 61. Code 51 indicates that the ECT signal is greater than the Self-Test maximum value of 4.6 volts (open circuit). Possible causes are: faulty ECT sensor, open circuit or faulty ECA. Turn key off and wait 10 seconds. Disconnect wiring harness from ECT sensor. Inspect and repair wiring as necessary. Connect a jumper wire between ECT SIGNAL and SIGNAL RETURN terminals of ECT harness connector. Perform KOEO SELF-TEST. If Code 61 is displayed, replace ECT sensor, remove jumper wire, reconnect ECT sensor and repeat QUICK TEST. If Code 61 is not displayed, remove jumper wire and go to next step.
6. ECT Signal and Signal Return Continuity Check. Turn key off and wait 10 seconds. Disconnect harness from ECT sensor. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between ECT SIGNAL at ECT harness connector and test pin No. 7 at breakout box. Measure resistance between SIGNAL RETURN at ECT harness connector and test pin No. 46 at breakout box. If both readings are less than 5 ohms, replace ECA, remove breakout box, reconnect components and repeat QUICK TEST. If either reading is not less than 5 ohms, repair open circuit(s). Remove breakout box, and connect ECA and ECT sensor. Repeat QUICK TEST.
7. Service Code 61: Attempt To Generate Code 51. Code 61 indicates that the ECT signal is less than the 0.2 volt Self-Test minimum value (grounded circuit). Possible causes are: faulty ECT, grounded circuit or faulty ECA. Turn key off and wait 10 seconds. Disconnect ECT sensor. Inspect and repair connector and/or wiring as necessary. Perform KOEO SELF-TEST. If Code 51 is displayed, replace ECT sensor, connect sensor, and repeat QUICK TEST. If Code 51 is not displayed, go to next step.
8. Checking For VREF at TPS. 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 harness connector. (Scheme 234) If reading is not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If reading is 4-6 volts, reconnect TPS and go to next step.
9. Checking ECT Signal for Short to Ground. Turn key off and wait 10 seconds. Disconnect harness from ECT sensor. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 7 and test pins No. 40, 46, and 60 at breakout box. If any reading is less than 10K ohms, repair short circuits. Remove breakout box, connect ECA and ECT sensor, and repeat QUICK TEST. If all readings are 10K ohms or more, replace ECA. Remove breakout box, connect ECA and ECT sensor and repeat QUICK TEST.
10. Continuous Memory Code 51: Check ECT Sensor. Code 51 indicates that the ECT signal was greater than the Self-Test maximum voltage of 4.6 volts sometime during vehicle operation. Possible causes are: faulty ECT sensor, open harness or faulty ECA. Enter KOEO CONTINUOUS MONITOR (WIGGLE) TEST. Observe VOM or diagnostic tester for indication of fault 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, clear continuous memory and repeat QUICK TEST. If no fault is indicated, go to next step.
11. Checking EEC-IV Harness. While in KOEO CONTINUOUS MONITOR (WIGGLE) TEST, observe VOM or diagnostic tester for indication of fault as you bend, shake or wiggle EEC-IV harness. Start at sensor connector and work toward dash panel. Also test harness from dash panel to ECA in same manner. If fault is indicated, isolate fault in wiring and repair as necessary. Clear continuous memory and repeat QUICK TEST. If fault is not indicated, go to next step.
12. Checking ECA and Harness Connectors. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connectors and terminals for damage and repair as necessary. Repeat QUICK TEST. If connectors and terminals are okay, fault cannot be duplicated at this time. Go to next step.
13. Continuous Memory Code 61: Check ECT Sensor. Code 61 indicates that the ECT signal was less than the 0.2 volt Self-Test minimum value (grounded circuit) sometime during vehicle operation. Possible causes are: faulty ECT, grounded circuit or faulty ECA. Using KOEO CONTINUOUS MONITOR (WIGGLE) TEST, observe VOM or diagnostic tester for indication of fault 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. If no fault is indicated, repeat step 11).

TEST B6 - MAP/BP SENSOR

Note. This test should be performed when Service Code 22 or 72 is displayed in QUICK TEST procedures, or other symptom. Barometric pressure sensor output is digital and must be measured with an oscilloscope or MAP/BP tester.

MAP/BP Tester Hook-Up. Scheme 232

MAP SENSOR SPECIFICATIONS

MAP/BP SENSOR SPECIFICATIONS

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, or engine condition (valves, vacuum leaks, valve timing, EGR valve, etc.).

1. Service Code 22. Code 22 indicates that the MAP/BP sensor is out of Self-Test voltage range (1.4-1.6 volts). Possible causes are: MAP/BP signal circuit open between sensor harness connector and ECA, MAP/BP signal circuit shorted to VREF, SIG RTN or ground, faulty MAP/BP sensor, vacuum trapped at MAP/BP sensor, high atmospheric pressure, faulty ECA or VREF or SIG RTN circuit open at sensor. Turn key off. Disconnect MAP/BP sensor from harness. Connect MAP/BP tester between wiring harness and MAP/BP sensor and connect tester to DVOM. (Scheme 232) Set DVOM on 20-volt scale. Go to next step.
2. Checking Power to MAP/BP Sensor. Green light on tester indicates VREF is okay (4-6 volts). Red light or no light on tester indicates VREF is either too low or too high. Turn key on. If Green light on tester is on, VREF is okay, go to step 4). If Green light is not on, go to next step.
3. VREF Isolation. With MAP/BP tester connected, turn key on. Disconnect MAP/BP sensor. If Green light is on, VREF is correct. Replace MAP/BP sensor and repeat QUICK TEST. If green light is not on, remove MAP/BP tester. Reconnect sensor, and go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1).
4. MAP/BP Tester Output Reading. If accessible, measure several known good MAP sensors on available vehicles. The measured voltage will be typical for your location on day of testing. With MAP/BP tester connected and key on, measure MAP sensor voltage output. See «MAP SENSOR VOLTAGE OUTPUT»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) table below. If voltage output is in correct range for altitude, remove MAP/BP tester and go to next step. If output reading is not within range, remove MAP/BP tester and go to step 6). MAP SENSOR VOLTAGE OUTPUT Elevation (Ft.) 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. Checking MAP/BP Signal Continuity. Turn key off and wait 10 seconds. Disconnect harness from MAP/BP sensor. Disconnect ECA 60 pin connector. Inspect 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 harness connector and test pin No. 45 at breakout box. (Scheme 232) If reading is less than 5 ohms, replace ECA. Connect ECA and MAP/BP sensor and repeat QUICK TEST. If reading is not less than 5 ohms, repair open in circuit. Remove breakout box, connect ECA and MAP/BP sensor. Repeat QUICK TEST.
6. Check MAP/BP Signal For Shorts To VREF, Signal Return And Ground. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Disconnect harness from MAP/BP sensor. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 45 and test pins No. 26, 46, 40, and 60 at breakout box. If any reading is less than 10K ohms, repair short(s) in wiring. Remove breakout box and connect ECA and MAP/BP sensor. Repeat QUICK TEST. If all readings are above 10K ohms, replace MAP/BP sensor. Remove breakout box, reconnect components and repeat QUICK TEST.
7. Service Code 22: Check for EGR Codes. Possible causes are: faulty MAP/BP sensor, faulty vacuum lines or excess EGR. If Service Codes 31, 32, 33, 34 or 35 are present, go to KOER SELF-TEST CODES, CIRCUIT TEST & STEP table in the beginning of this article and perform appropriate circuit test. If codes are not present, go to next step.
8. Checking MAP Sensor. Turn key off and wait 10 seconds. Disconnect vacuum hose from MAP sensor. Connect vacuum pump to MAP sensor and apply 18 in. Hg vacuum to sensor. If sensor does not hold vacuum, replace sensor, connect vacuum line and repeat QUICK TEST. If MAP sensor holds vacuum, release vacuum and go to next step.
9. Attempt To Eliminate Code 22 (Engine Running). Turn key off and wait 10 seconds. Plug vacuum hose going to MAP sensor. Start engine and increase engine speed to 1400-1600 RPM. Slowly apply 15 in. Hg. vacuum to MAP sensor. While maintaining RPM, perform KOER SELF-TEST. Check for Code 22 and disregard any other codes at this time. If Code 22 is still present, replace MAP sensor, reconnect vacuum line and repeat quick test. If Code 22 is no longer displayed, inspect and repair vacuum hose going to MAP sensor. If hose is okay, service other engine running codes. If there are no codes, check engine for cause of low vacuum.
10. Service Code 72: Check Vacuum Lines. Code 72 indicates that MAP sensor output did not change enough during dynamic response ("Goose") test. Possible causes are: incorrect MAP sensor vacuum line routing or faulty MAP sensor. With key on, check vacuum lines for correct routing. Check for disconnections, kinks or blockage. Repair vacuum lines as necessary and repeat quick test. If vacuum lines are okay, go to next step.
11. Checking MAP Sensor. Turn key off and wait 10 seconds. Disconnect vacuum line from MAP sensor. Install vacuum pump to sensor and apply 18 in. Hg vacuum to sensor. If MAP sensor holds vacuum, release vacuum, remove vacuum pump, reconnect vacuum line and go to next step. If vacuum was not held, replace MAP sensor, reconnect components and repeat quick test.
12. Checking Vacuum Supply During "Goose" Test. Turn key off, wait 10 seconds. Use a "T" fitting to install a vacuum gauge in the intake manifold MAP sensor supply line. Run the KOER SELF-TEST while observing the vacuum gauge. If vacuum decreased by more than 10 in. Hg during dynamic response ("Goose") test, remove gauge, replace MAP sensor and repeat QUICK TEST. If vacuum did not decrease by 10 in. Hg or more, EEC-IV system is okay, repair engine mechanical components as necessary to increase engine vacuum.
13. Service Code 22: Continuous Test: Operating MAP/BP Sensor. Continuous Memory Code 22 indicates the MAP/BP sensor was out of Self-Test range (1.4-1.6 volts) during normal driving conditions. Possible causes are: faulty MAP/BP sensor, faulty wiring harness or connectors and unusually high or low barometric pressure. Using KOEO CONTINUOUS MONITOR TEST mode, observe test equipment while performing the following: Connect a vacuum pump to the MAP/BP sensor. Slowly apply 25 in. Hg vacuum to sensor. Slowly bleed off vacuum from sensor. Lightly tap on sensor (to simulate road shock). "Wiggle" sensor connector.

If a fault is indicated, disconnect sensor, inspect and repair connectors as necessary. If connectors are okay, replace MAP/BP sensor. If a fault is not indicated, go to next step.

14) Checking EEC-IV Harness. Stay in KOEO CONTINUOUS MONITOR (WIGGLE) TEST. Observe VOM or diagnostic tester for indication of fault while shaking, bending or wiggling small sections of harness from sensor connector to dash panel. Also check harness from dash panel to ECA in same manner. If fault is indicated, isolate fault area in harness and repair as necessary. Clear codes and repeat QUICK TEST. If no fault is indicated, go to next step.

15) Checking ECA Connector and Harness. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connectors and terminals for obvious damage. If connectors and terminals are not okay, repair as necessary. Repeat QUICK TEST. If connectors and terminals are okay, fault cannot be duplicated at this time. Continuous Code 22 testing is complete.

TEST B7 - KNOCK SENSOR

Note. Perform this test when Service Code 25 is received during QUICK TEST procedure or you are directed here by other diagnostic tests. Use DYNAMIC RESPONSE CHECK as specified in steps 1) and 6). There is no need to perform WOT during this test. For additional information see QUICK TEST DIAGNOSTIC AIDS, DYNAMIC RESPONSE CHECK in front of this article.

Knock (Detonation) Sensor Circuit. Scheme 233

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: fuel quality, engine condition (valves, vacuum leaks, valve timing, EGR valve, etc.) and spark timing.

1. Service Code 25: Generate Knock Manually. Code 25 indicates that the Knock Sensor (KS) signal was not sensed during the dynamic response ("Goose") test after the engine ID code in the KOER SELF-TEST. Possible causes are: a faulty KS, open or shorted harness or faulty ECA. Ensure engine is at normal operating temperature. Perform KOER SELF-TEST. When DYNAMIC RESPONSE CHECK code is given, lightly tap exhaust manifold, above knock sensor with 4 oz. hammer. DO NOT "Goose" throttle. If code 25 is present, go to next step. Ignore all other codes at this time. If Code 25 is not present, knock system is okay. Repeat KOER SELF-TEST and service other codes.
2. Circuit Voltage Check. Turn key off and wait 10 seconds. Disconnect knock sensor. Inspect for and repair any damaged wiring. Set DVOM on 20-volt scale. With KOEO measure voltage at knock sensor harness connector between KS and SIGNAL RETURN. (Scheme 233) If voltage is greater than 4 volts, go to step 5). If voltage is 1-4 volts, go to step 6). If reading is less than one volt, go to next step.
3. Check Continuity of KS and Signal Return Circuit. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA and knock sensor disconnected. With DVOM on 200-ohm scale, measure resistance between SIGNAL RETURN at sensor harness connector and test pin No. 46 at breakout box, and between knock sensor harness connector KS and test pin No. 23 at breakout box. (Scheme 233) If either reading is 5 ohms or more, service open circuit, remove breakout box, reconnect components and repeat QUICK TEST. If both readings are less than 5 ohms, go to next step.
4. Checking KS Circuit for Short to Ground. Turn key off and wait 10 seconds. With breakout box installed, ECA and knock sensor disconnected, set DVOM on 200K-ohm scale. Measure resistance between knock sensor harness connector KS signal and test pins No. 40, 46 and 60 at breakout box. If all readings are 10K ohms or more, remove breakout box, reconnect components and go to step 6). If any reading is less than 10K ohms, repair short in harness, remove breakout box, reconnect components and repeat QUICK TEST.
5. Checking KS Circuit for Short to Power. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect and repair as necessary. Install breakout box, leaving ECA disconnected. Disconnect KS. Set DVOM on 20-volt scale. Turn key on, leaving engine off. Measure voltage between test pins No. 23 and 40 at breakout box. If reading is 0.5 volt or more, repair knock sensor harness short to power. Remove breakout box, reconnect components and repeat QUICK TEST. If reading is less than 0.5 volt, remove breakout box, reconnect ECA and go to next step.
6. Test ECA By Sensor Substitution. Turn key off and wait 10 seconds. Without installing a known good knock sensor on engine, connect it to harness. Substitute should have the same part number. Ensure engine is at normal operating temperature. Perform KOER SELF-TEST. When DYNAMIC RESPONSE code is given, lightly tap knock sensor with 4 oz. hammer. DO NOT "Goose" throttle. If Code 25 is displayed replace ECA, reconnect original knock sensor and rerun QUICK TEST. Ignore all other codes at this time. If Code 25 does not appear, install new knock sensor and repeat QUICK TEST.

TEST B8 - TPS

Note. Perform this test when Service Code 23, 53, 63, or 73 is displayed during QUICK TEST.

TPS Electrical Circuit. Scheme 234

TPS SPECIFICATIONS

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.

1. Service Code 23. Code 23 indicates that the TPS rotational setting may be out of the Self-Test range. See «TPS SPECIFICATIONS»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) table above. If KOEO SELF-TEST Code 68 or KOER SELF-TEST Codes 31, 41, or 58 are displayed, service these codes first. Disregard Code 23 at this time. If these codes are not displayed, go to next step.
2. Check for Stuck Throttle Plate. Inspect throttle body and linkage for binding or sticking. Ensure 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 any problem and repeat QUICK TEST. If no mechanical problem is found, go to next step.
3. Service Code 53: Attempt To Generate Code 63. Code 53 indicates that TPS signal is greater than Self-Test maximum value. See «TPS SPECIFICATIONS»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) table above. Possible causes are: faulty TPS, short to power in harness or faulty ECA. Turn key off and wait 10 seconds. Disconnect TPS harness connector at throttle body. Inspect and repair any damaged wiring. Perform KOEO 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. Check VREF to Signal Return. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale. Disconnect TPS harness connector at throttle body. Inspect and repair any damaged wiring. With KOEO, measure voltage at TPS harness connector between VREF and SIG RTN. (Scheme 234) If reading is not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If reading is 4-6 volts, replace TPS, adjust and repeat QUICK TEST.
5. Checking TP Signal For Short to Power. Turn key off and wait 10 seconds. Disconnect TPS. Set DVOM on 200K-ohm scale. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Measure resistance between test pin No. 47 and test pins No. 26 and 57 at breakout box. If either reading is less than 10K ohms, repair short in harness. Remove breakout box, reconnect components and repeat QUICK TEST. If both readings are 10K ohms or more, replace ECA. Remove breakout box, reconnect components and repeat QUICK TEST.
6. Service Code 63: Attempt To Generate Code 53. Code 63 indicates that TP signal is less than minimum Self-Test value. Possible causes are: faulty TPS, open harness, grounded harness or faulty ECA. Turn key off and wait 10 seconds. Disconnect TPS harness. Install a jumper wire between VREF and TP at TPS harness connector. (Scheme 234) Perform KOEO SELF-TEST. Check for Codes 53/23. Ignore all other codes at this time. If no codes are displayed, immediately remove jumper wire, and go to step 9). If Code 53/23 is displayed, replace TPS, remove jumper wire, reconnect components and repeat QUICK TEST. If Code 53/23 is not displayed, remove jumper wire and go to next step.
7. Service Code 63: Check Voltage VREF To SIG RTN. Turn key off and wait 10 seconds. Disconnect TPS harness at throttle body. Inspect and repair any damaged wiring. Set DVOM on 20-volt scale. With KOEO, measure voltage between VREF and SIG RTN at TPS harness connector. If reading is not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If reading is 4-6 volts, go to next step.
8. Checking TP Circuit Continuity. Turn key off and wait 10 seconds. Leave TPS disconnected. Set DVOM on 200-ohm scale. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box and connect ECA to it. Measure resistance between TP signal at TPS harness connector and test pin No. 47 at breakout box. If reading is 5 ohms or more, repair open circuit. Remove breakout box, connect ECA and TPS, and repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
9. Checking Resistance Of TP Circuit To Ground/SIG RTN. Turn key off and wait 10 seconds. Leave TPS disconnected. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box and set DVOM on 200K-ohm scale. Measure resistance at TPS harness connector between TP signal and ground. Also measure between TP signal and test pin No. 46 at breakout box. If either reading is less than 10K ohms, repair short circuit, remove breakout box, reconnect components and repeat QUICK TEST. If both readings are 10K ohms or more, replace ECA. Remove breakout box, reconnect components, and repeat QUICK TEST. NOTE: Engine Running Service Code 73 in step 10) indicates that TPS did not exceed 25% of its rotation during DYNAMIC RESPONSE ("Goose") CHECK. For additional information see KOER SELF- TEST, DYNAMIC RESPONSE CHECK in this article.
10. Engine Running Service Code 73: TPS Movement During Dynamic Response Test. Turn key off. Disconnect ECA. Inspect and repair any damaged wiring. Install breakout box and connect ECA to it. Set DVOM on 20-volt scale. Connect DVOM to test pins No. 46 and 47 at breakout box. Perform KOER SELF-TEST. If voltage increases to greater than 3.5 volts during Dynamic Response test, remove breakout box, replace ECA and repeat quick test. If voltage does not exceed 3.5 volts, ensure TPS is correctly installed and adjusted. If okay, replace TPS and repeat QUICK TEST.
11. Continuous Memory Code 53: Monitor TP Circuit. Using KOEO CONTINUOUS MONITOR (WIGGLE) TEST. Observe VOM or diagnostic tester for indication of fault while slowly opening throttle to WOT. Slowly release throttle to closed position and lightly tap TPS and wiggle TPS harness connector. If no fault is indicated, go to step 13). If fault is indicated, go to next step.
12. TPS Voltage Measurement. 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 to it. Stay in KOEO CONTINUOUS MONITOR (WIGGLE) TEST as in previous step 11). Connect DVOM between test pins No. 47 and 46 at breakout box. Set DVOM on 20 volt scale. Turn key on, leaving engine off. Observe DVOM and repeat step 11). If fault occurs at less than 4.25 volts, inspect TPS connectors and terminals. If okay, replace TPS, clear continuous memory code 53 and repeat QUICK TEST. If fault does not occur at less than 4.25 volts, TPS over-travel may have caused Continuous Code 53. TPS is okay, go to next step to check harness.
13. Checking EEC-IV Harness. While in KOEO CONTINUOUS MONITOR (WIGGLE) TEST, shake, bend and wiggle small sections of EEC-IV harness from TPS to dash panel, and from dash pane to ECA. If fault is indicated, isolate fault in wiring and repair as necessary. Clear continuous memory code 53 and repeat QUICK TEST. If no fault is indicated, go to next step.
14. Checking ECA And Harness Connectors. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connectors and terminals for damage. Repair as necessary. Clear codes and repeat QUICK TEST. If connectors and terminals are okay, fault cannot be duplicated at this time. Clear Continuous Memory Code 53. Testing is complete.
15. Continuous Memory Code 63: Monitor TP Circuit. Enter KOEO CONTINUOUS MONITOR (WIGGLE) TEST. Observe VOM or diagnostic tester 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. Clear continuous memory code 63 and repeat QUICK TEST. If no fault is indicated, go to next step.
16. EEC-IV Harness Test. While in KOEO CONTINUOUS MONITOR (WIGGLE) TEST, shake, bend and wiggle small sections of EEC-IV harness from TPS sensor to dash panel, and from dash panel to ECA. If fault is indicated, isolate fault in wiring and repair as necessary. Clear continuous memory code 63 and repeat QUICK TEST. If no fault is indicated, go to next step.
17. ECA Connector Test. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connectors and terminals for obvious damage. If connectors and terminals are damaged, repair as necessary. Clear codes and repeat QUICK TEST. If connectors and terminals are okay, fault cannot be duplicated at this time. Clear Continuous Memory Code 63, testing is complete.

TEST B10 - PFE, EVR

Note. Perform this test when Service Code 31, 32, 33, 34, 35, or 84 is displayed during QUICK TESTS or when directed here by other test procedures.

Pressure Feedback EGR (PFE) & EGR Valve Regulator (EVR) Circuits. Scheme 235

PFE SENSOR SPECIFICATIONS

1. Service Code 31: Induce Code 35. Code 31 indicates the PFE sensor signal is less than the Self-Test minimum of 0.2 volt. Turn key off. Disconnect PFE harness at sensor. Install a jumper wire between VREF and PFE SIGNAL at PFE harness connector. (Scheme 235) Perform KOEO SELF-TEST. Check for Code 35. Ignore all other codes at this time. If no codes are displayed, immediately remove jumper wire and go directly to step 4). If Code 35 is displayed, remove jumper wire, replace PFE sensor and repeat QUICK TEST. If Code 35 is not displayed, go to next step.
2. Measure VREF to SIG RTN Voltage. With key off and PFE harness disconnected, set DVOM on 20-volt scale. With KOEO, measure voltage at PFE harness connector between VREF and SIG RTN. (Scheme 235) If reading is less than 4 volts or more than 6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If reading is between 4 and 6 volts, go to next step.
3. PFE Signal Continuity. With key off and PFE harness disconnected, set DVOM on 200-ohm scale. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Measure resistance between PFE SIGNAL at harness connector and test pin No. 27 at breakout box. If reading is 5 ohms or more, repair faulty circuit. Connect PFE sensor and remove breakout box. Repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
4. PFE Signal Circuit Resistance. With key off and PFE harness disconnected, install breakout box leaving ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between ground and PFE signal at harness connector. Measure resistance between PFE signal at harness connector and test pin No. 46. If either reading is less than 10K ohms, repair short circuit. Connect PFE and remove breakout box. Repeat QUICK TEST. If both readings are 10K ohms or more, replace ECA. Connect PFE and remove breakout box. Repeat QUICK TEST.
5. Service Code 35: Induce Code 31. Code 35 indicates the PFE sensor signal is greater than the Self-Test maximum of 4.8 volts. Possible causes are: faulty PFE sensor, shorted harness or faulty ECA. Turn key off and disconnect PFE sensor. Inspect for and repair any damaged wiring. Perform KOEO SELF-TEST. Check for Code 31. Ignore all other codes at this time. If Code 31 is not displayed, go to step 7). If Code 31 is displayed, go to next step.
6. Measure VREF to SIG RTN Voltage. With key off and PFE harness disconnected, set DVOM on 20-volt scale. Turn key on, leaving engine off. Measure voltage at PFE harness connector between VREF and SIG RTN. (Scheme 235) If reading is 4-6 volts, replace PFE sensor and repeat QUICK TEST. If reading is not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1).
7. Checking PFE Circuit For Shorts. With key off and PFE harness disconnected, disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 27 and test pins No. 26, 37 and 57 at breakout box. If either reading is less than 10K ohms, repair short. Connect PFE and remove breakout box. Repeat QUICK TEST. If both readings are 10K ohms or more, replace ECA. Connect PFE and remove breakout box. Repeat QUICK TEST.
8. Service Code 34: PFE Sensor Out Of Range. Code 34 indicates that PFE sensor is out of Self-Test range of 2.6-4.2 volts and that PFE sensor is probably faulty. Possible causes are: faulty PFE sensor, obstructed pressure feed tube or garage exhaust ventilation system deflecting PFE sensor. The PFE system can detect lack of pressure in exhaust system. An efficient garage exhaust ventilation system installed during KOEO SELF-TEST, may cause PFE sensor to generate Code 34. Remove exhaust ventilation system and properly vent to atmosphere. Repeat KOEO SELF-TEST. If Code 34 is not displayed, service other codes displayed during KOEO SELF-TEST. If no other codes are displayed, continue with QUICK TEST. If Code 34 is displayed, go to next step.
9. Check Pressure Feed Tube to PFE Sensor. Remove pressure feed tube from PFE sensor. Inspect complete tube, including PFE inlet for blockage. If blockage is found, repair as necessary and repeat QUICK TEST. If no blockage is found, go to next step.
10. Measuring VREF to SIG RTN Voltage. Turn key off and disconnect PFE sensor. Inspect for and repair any damaged wiring. Set DVOM on 20-volt scale. Turn key on, leaving engine off. Measure voltage at PFE harness connector between VREF and SIG RTN. If reading is between 4 and 6 volts, replace PFE sensor and repeat QUICK TEST. If reading is less than 4 volts or more than 6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1).
11. Service Code 84: Measure EVR Solenoid Resistance. Code 84 indicates a failure in EVR solenoid circuit. Possible causes are: faulty EVR solenoid, open or shorted harness or faulty ECA. Turn key off. Set DVOM on 200-ohm scale. Disconnect EVR solenoid connector and measure solenoid resistance. If reading is not 30-70 ohms, replace EVR solenoid assembly. Repeat QUICK TEST. If reading is 30-70 ohms, go to next step.
12. Checking For VPWR At EVR Solenoid. With EVR solenoid disconnected from harness, set DVOM on 20-volt scale. Turn key on, leaving engine off. Measure voltage between negative battery terminal and VPWR circuit at EVR solenoid harness connector. (Scheme 235) If reading is less than 10.5 volts, repair VPWR open circuit. Repeat QUICK TEST. If reading is 10.5 volts or more, go to next step.
13. Checking Continuity of EVR Circuit. Turn key off and disconnect EVR solenoid from harness. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 33 at the breakout box and EVR signal at the EVR solenoid harness connector. If reading is 5 ohms or more, repair open circuit. Reconnect components, remove breakout box and repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
14. Checking EVR Circuit For Ground Shorts. Turn key off. Install breakout box, leaving ECA disconnected. Disconnect EVR solenoid. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 33 and test pins No. 37, 57, 40, and 60 at the breakout box. If any reading is less than 10K ohms, repair short circuit. Remove breakout box. Connect ECA and EVR solenoid. Repeat QUICK TEST. If code is repeated, replace ECA. If all readings are 10K ohms or more, replace ECA. Remove breakout box. Connect ECA and EVR solenoid. Repeat QUICK TEST.
15. Service Code 32: Verify Engine Running Codes. Code 32 indicates EGR valve is not fully seated. Possible causes are: obstructed vacuum line, contaminated EVR filter, faulty EGR valve or faulty EVR solenoid. The PFE system can detect a lack of pressure in exhaust system. An efficient garage exhaust ventilation system, installed during KOER SELF-TEST may cause PFE sensor to generate Code 32. Temporarily remove exhaust ventilation system, properly vent to atmosphere and retest. If Code 32 is not displayed, service other codes displayed during KOER SELF-TEST. If no other codes, continue with QUICK TEST. If Code 32 is displayed, go to next step.
16. Service Code 31: Separating EVR From PFE. Code 31 indicates PFE sensor signal is less than Self-Test minimum. Turn key off. Disconnect and plug EGR valve vacuum hose. Perform KOER SELF-TEST. If Codes 31 or 32 are present, go to next step. If not, go to step 18).
17. Checking PFE Sensor Supply Tube For Blockage. With key off, check PFE sensor supply tube for blockage or leaks. If these faults are found, repair as necessary. Connect all lines and repeat QUICK TEST. If no faults are found, service EGR system.
18. EVR Filter Inspection. Turn key off. Remove and inspect EVR filter for contamination. A blocked filter will cause vacuum to be applied to EGR valve prematurely. If filter is contaminated, replace filter. Connect all lines and repeat QUICK TEST. If filter is not contaminated, replace EVR solenoid. Repeat QUICK TEST.
19. Service Code 34 or 35: Check for Excessive Backpressure. Codes 34 and 35 in KOER SELF-TEST indicate excessive exhaust backpressure. Possible causes are: the exhaust system is blocked, or faulty PFE sensor. Turn key off. Substitute known good PFE sensor in place of original. Repeat KOER SELF-TEST. If Code 34 or 35 is not displayed, replace PFE sensor. Repeat QUICK TEST. If Code 34 or 35 is displayed, check exhaust system for restrictions.
20. Service Code 33: Verify Vacuum at EGR Valve. Code 33 indicates PFE sensor input did not change after EVR solenoid received signal from ECA to open the EGR valve. Possible causes are: vacuum hose leaks, obstructed vacuum hose, faulty EVR solenoid, faulty PFE sensor, faulty EGR valve. Turn key off and wait 10 seconds. Using a vacuum "T", connect vacuum gauge at EGR valve. Perform KOER SELF-TEST while observing vacuum gauge. Disregard code output. If vacuum reading is greater than one in. Hg, go to step 26). If vacuum reading is one in. Hg or less, go to next step.
21. Vacuum Supply Verification. With key off, check vacuum hose from EVR solenoid to EGR valve and from vacuum source to EVR solenoid for loose connections, obstructions, cracks, etc. If vacuum hoses are damaged, repair or replace as necessary. Repeat QUICK TEST. If hoses are okay, go to step 24).
22. Supply Hose to EVR Verification. Turn key off and wait 10 seconds. Attach vacuum gauge to supply line between throttle body and EVR solenoid. Start and run engine at 2000 RPM. If vacuum reading is greater than 10 in. Hg, go to next step. If vacuum reading is less than 10 in. Hg, replace vacuum line to EVR, remove vacuum gauge and rerun QUICK TEST.
23. Checking PCV Valve for Operation. With key off, disconnect vacuum hose at PCV valve from EVR solenoid. Connect vacuum pump to PCV valve. Slowly apply 10 in. Hg vacuum. If PCV valve opens and does not leak down, remove vacuum gauge, reconnect valve and go to step 25). If PCV valve does not open, service or replace PCV valve.
24. Vacuum Supply to EVR Verification. Turn key off and wait 10 seconds. Attach vacuum gauge to source line from manifold. Start engine and run at idle. If vacuum is present, go to step 35). If no vacuum is present, replace vacuum hose to EVR solenoid and repeat QUICK TEST.
25. Checking EGR Valve Operation. With KOEO, disconnect vacuum hose at EGR valve. Connect vacuum pump to EGR valve. While observing EGR valve, slowly apply 10 in. Hg vacuum. The EGR valve should begin to open with a very small amount of vacuum (1-1.5 in. Hg) and be fully open with about 4 in. Hg. If EGR opens freely and smoothly, check EVR solenoid filter for obstructions. If filter is okay, replace EVR solenoid and rerun QUICK TEST. If EGR valve does not open freely and smoothly, service or replace EGR valve.
26. Checking PFE Sensor Supply Tube. With key off, check control pressure input tube to PFE sensor for cracks, obstructions or faulty connections. If supply tube is faulty, repair as necessary. If supply tube is okay, go to next step.
27. Substitute Known Good PFE Sensor. Turn key off and wait 10 seconds. Substitute known good PFE sensor in place of original. Rerun KOER SELF-TEST. If Code 33 is present, service or replace EGR valve as necessary. If Code 33 is not present, original PFE sensor was the cause of the original Code 33. Replace PFE sensor and rerun QUICK-TEST.
28. Continuous Memory Code 31 or 35: Testing PFE Sensor. Code 31 or 35 indicates that PFE sensor signal was less than (Code 31) or greater than (Code 35) the Self-Test voltage sometime during vehicle operation. Using KOEO CONTINUOUS MONITOR (WIGGLE) TEST, observe VOM or diagnostic tester for indication of fault while performing the following steps. Connect a vacuum pump to PFE sensor and slowly apply 5 in. Hg vacuum to sensor. Slowly bleed vacuum off PFE sensor. Lightly tap on PFE sensor and wiggle PFE connector. If fault is indicated, disconnect harness and inspect connector. If connector and terminals are okay, replace PFE sensor. Repeat QUICK TEST. If no fault is indicated, go to next step.
29. Checking EEC-IV Harness. Observe VOM or diagnostic tester for fault indication while grasping harness close to sensor connector, then wiggling, shaking or bending small sections of harness while working your way to dash panel. Also wiggle, shake or bend harness from dash panel to ECA. If fault is indicated, isolate fault and repair as necessary. Repeat QUICK TEST. If fault is not indicated, go to next step.
30. Checking ECA and Harness Connectors. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect both connector and terminals for damage. If connector and terminals are damaged, repair as necessary. Repeat QUICK TEST. If connector and terminals are okay, fault is intermittent and cannot be duplicated at this time.
31. Continuous Memory Code 34: Checking PFE Supply Tube for Blockage. Code 34 indicates that the PFE sensor was restricted sometime during vehicle operation. Turn key off. Remove PFE sensor and inspect sensor supply inlet for liquids or any type of blockage. Inspect PFE supply tube at EGR valve base for liquids or blockage. If supply tube is blocked, clean or service as necessary. Repeat QUICK TEST. If supply tube is not blocked, fault is intermittent and cannot be duplicated at this time.
32. Continuous Memory Code 32: Check EGR Valve Operation. Code 32 indicates that the EGR valve did not seat itself fully sometime during vehicle operation. Turn key off. Connect vacuum pump to EGR valve and apply 10 in. Hg of vacuum. While observing EGR valve, release vacuum, and repeat step if necessary. If EGR valve does not operate smoothly, service or replace EGR valve. If EGR valve works smoothly, go to next step.
33. Vacuum Line Inspection. Inspect EGR valve vacuum supply line, from EVR solenoid to EGR valve for kinks or obstructions. If vacuum supply line is blocked, repair as necessary. Repeat QUICK TEST. If vacuum supply line is okay, go to next step.
34. EVR Solenoid Filter Inspection. Carefully check EVR filter for contamination or obstructions. If EVR filter is contaminated, replace filter and repeat QUICK TEST. If EVR filter is not contaminated, fault is intermittent and cannot be duplicated at this time. Continuous Memory Code 32 testing is complete.
35. Continuous Memory Code 33: Checking EGR Valve Operation. Code 33 indicates that EGR valve intermittently did not open during vehicle operation. Turn key off. Connect a vacuum pump to EGR valve. While observing EGR valve, slowly apply 10 in. Hg of vacuum. EGR valve should begin to open at 1-1.5 in. Hg and be fully open at 4 in. Hg of vacuum. If EGR valve does not move freely and smoothly, service exhaust gas recirculation system. If EGR valve moves freely and smoothly, go to next step.
36. EVR Harness Test. With key off, disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box and connect ECA to box. Enter OUTPUT STATE CHECK. Set DVOM on 20 volt scale. Connect DVOM negative test lead to test pin No. 40 at breakout box and DVOM positive test lead on test pin No. 33. Move throttle valve to indicate 10.5 volts or more and maintain position. While observing DVOM, grasp harness closest to EVR connector. Wiggle, shake or bend small sections of harness while working your way to dash panel. Lightly tap EVR solenoid to simulate road vibration. If DVOM reads 10.5 volts or less, isolate fault and repair as necessary. Repeat QUICK TEST. If DVOM reads 10.5 volts or more, fault cannot be duplicated at this time. Continuous Memory Code 33 testing is complete.

TEST B11 - EVP, EVR

Note. Perform this test when Service Code 31, 32, 33, 34, 35, 38 or 84 is displayed during QUICK TESTS or when directed here by other test procedures.

EVP Sensor & EVR Solenoid Circuits. Scheme 236

1. Service Code 31: Generate Code 35. Code 31 indicates that EVP signal is less than the Self-Test minimum of 0.2 volt. Turn key off and wait 10 seconds. Disconnect EVP harness at sensor. Install a jumper wire between VREF and EVP SIGNAL at EVP sensor harness connector. Perform KOEO SELF-TEST. Check for code 35. Ignore all other codes at this time. If Code 35 is displayed, remove jumper and replace EVP sensor. Repeat QUICK TEST. If Code 35 is not displayed, remove jumper wire and go to next step.
2. Checking VREF to SIG RTN Voltage. With KOEO and EVP disconnected, set DVOM on 20-volt scale. Measure voltage at EVP harness connector between VREF and SIG RTN. If reading is less than 4 or more than 6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1). If reading is between 4 and 6 volts, go to next step.
3. Checking EVP SIGNAL Continuity. Turn key off, wait 10 seconds. Disconnect EVP sensor, set DVOM on 200-ohm scale. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, and connect ECA to box. Measure resistance between EVP SIGNAL at harness connector and test pin No. 27 at breakout box. If reading is 5 ohms or more, repair open circuit. Connect EVP sensor and remove breakout box. Repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
4. Checking EVP SIGNAL For Shorts To Ground. With key off and EVP harness disconnected, leave breakout box installed and ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 27 and test pins No. 40, 46 and 60 at breakout box. If any reading is less than 10K ohms, repair short circuit(s). Remove breakout box, reconnect components and repeat QUICK TEST. If all readings are 10K ohms or more, replace ECA. Connect EVP and remove breakout box. Repeat QUICK TEST.
5. Service Code 35: Attempt To Generate Code 31. Code 35 indicates EVP signal is greater than the Self-Test maximum of 4.81 volts. Possible causes are: faulty EVP sensor or short to power in harness. Turn key off and wait 10 seconds. Disconnect EVP sensor. Perform KOEO SELF-TEST. Check for Code 31. Ignore all other codes at this time. If code 31 is not displayed, go to step 7). If Code 31 is displayed, go to next step.
6. Checking VREF To SIG RTN Voltage. With EVP harness disconnected, set DVOM on 20-volt scale. With KOEO, measure voltage at EVP harness connector between VREF and SIG RTN. (Scheme 236) If reading is 4-6 volts, replace EVP sensor. Repeat QUICK TEST. If reading is not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1).
7. Checking EVP SIGNAL For Short To Power. Turn key off and disconnect EVP. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 27 and test pins No. 26 and 57 at breakout box. If either reading is less than 10K ohms, repair short in harness. Remove breakout box, reconnect components and repeat QUICK TEST. If both readings are 10K ohms or more, replace ECA. Reconnect components and remove breakout box. Repeat QUICK TEST.
8. Service Code 84: Checking EVR Solenoid Resistance. Code 84 indicates a faulty EVR circuit. Possible causes are: faulty EVR solenoid, open or shorted harness or faulty ECA. Turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Disconnect EVR solenoid and measure solenoid resistance. If reading is not between 30 and 70 ohms, replace EVR solenoid assembly. Repeat QUICK TEST. If reading is between 30 and 70 ohms, go to next step.
9. Check For VPWR at EVR Solenoid. Leave EVR solenoid disconnected and set DVOM on 20-volt scale. Turn key on, leaving engine off. Measure voltage between negative battery terminal and VPWR circuit at EVR solenoid harness connector. (Scheme 236) If reading is less than 10.5 volts, repair VPWR open circuit. Repeat QUICK TEST. If reading is 10.5 volts or more, go to next step.
10. Check EVR Circuit Continuity. With key off and EVR solenoid disconnected, disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 33 and EVR SIGNAL at EVR solenoid harness connector. (Scheme 236) If reading is 5 ohms or more, repair open circuit. Remove breakout box, reconnect components and repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
11. Checking EVR Circuit For Short To Power And Ground. With key off, breakout box installed, and ECA and EVR solenoid disconnected, set DVOM on 200K-ohm scale. Measure resistance between test pin No. 33 and test pins No. 37/57, 40/60, and 46 at breakout box. If any reading is less than 10K ohms, repair short circuit(s). Remove breakout box, reconnect components and repeat QUICK TEST. If code is repeated, replace ECA. If all readings are 10K ohms or more, replace ECA. Remove breakout box, reconnect components and repeat QUICK TEST.
12. KOEO Code 34: Check For Service Code 84. KOEO Code 34 indicates EGR valve and/or EVP is not fully seated in the closed position. EVP voltage signal, in the closed position, is greater than the Self-Test maximum of 0.67 volt. Because of the preload on the installed EVP sensor it is very difficult to determine if the EGR valve is seated or the EVP sensor is in contact with the EGR valve stem. Possible causes are: poor continuity at EVP sensor, non-seated EGR valve, faulty EGR valve or faulty EVP sensor. Turn key off and wait 10 seconds. Check for Code 84 in KOEO SELF-TEST. If Code 84 is present, go to step 8). If Code 84 is not displayed, go to next step.
13. Functional Test of EVP Sensor and EGR Valve. Turn key off and wait 10 seconds. Disconnect EVP sensor. Inspect harness and connector, service as necessary. Remove vacuum line from EGR valve. Test EGR valve operation by applying and releasing vacuum to valve, using a vacuum pump. Reconnect vacuum line to EGR and reconnect EVP sensor. Repeat KOEO and KOER SELF-TEST. If Code 34 is still displayed, go to next step. If Code 34 is not displayed, the original code was set by a faulty connection or a sticking EGR valve. Testing is complete.
14. Substitute EVP Sensor on Original EGR Valve. Turn key off and wait 10 seconds. Install a good known EVP sensor on original EGR valve. Perform KOEO SELF-TEST. If Code 34 is still present, check EGR valve for mechanical malfunction. If Code 34 is not present, replace original EVP sensor. Repeat QUICK TEST.
15. KOEO and KOER Code 32: Checking EVP Sensor and EGR Valve. Code 32 indicates that EGR valve and/or EVP sensor lower than normal in the closed position. The EVP voltage is less than closed limit voltage of 0.29 volt. Preload on EVP sensor makes it difficult to determine whether the EGR valve has malfunctioned or if the EVP sensor has abnormally high resistance. Possible causes are: poor continuity at EVP sensor connector, non-seated or faulty EGR valve or faulty EVP sensor. Turn key off and wait 10 seconds. Disconnect EVP sensor. Inspect connector and harness for damage and service as necessary. Remove vacuum line from EGR valve. Test EGR valve operation by applying and releasing vacuum to valve, using a vacuum pump. Reconnect vacuum line to EGR and reconnect EVP sensor. Perform KOEO and KOER SELF-TEST. If Code 32 is still present, go to next step. If Code 34 is not displayed, the original code was set by a faulty connection or a sticking EGR valve. Testing of EGR valve is complete.
16. Substitute EVP Sensor On Original EGR Valve. Turn key off and wait 10 seconds. Install a known good EVP sensor on original EGR valve. Perform KOEO SELF-TEST. If Code 32 is present, check EGR valve for mechanical malfunction. If Code 32 is not present, replace original EVP sensor. Repeat QUICK TEST.
17. KOER Service Code 33: Checking Vacuum at EGR Valve. KOER Code 33 indicates that EVP sensor input did not change after ECA signaled EGR operation. Because a Code 84 was not received in the KOEO SELF-TEST, the EVR solenoid electrical function is okay. The lack of Code 32 or 34 indicate the EVP sensor is within the closed position specifications. Possible causes are: leaking vacuum hose, restricted vacuum hose, restricted EVR solenoid filter, or a faulty EGR valve. Turn key off. Using vacuum "T", connect vacuum gauge at EGR valve. Perform KOER SELF-TEST and observe vacuum gauge. If reading is 1.5 in. Hg or greater, go to step 20). If reading is less than 1.5 in. Hg, remove vacuum gauge and reconnect EGR valve, or go to next step.
18. Checking Vacuum Supply to EVR Solenoid. Turn key off. Disconnect vacuum source to EVR solenoid. Install vacuum gauge at vacuum source. Start engine. If vacuum is 10 in. Hg or more, go to next step. If reading is less than 10 in. Hg, check vacuum hose to EVR solenoid. Replace if necessary. Repeat QUICK TEST.
19. Checking Vacuum Hoses. Carefully check vacuum line for cracks, loose connections, blockage, kinks, and leaks. If vacuum hose is not okay, replace hose. Connect new vacuum hose and repeat QUICK TEST. If vacuum hose is okay, check EVR solenoid filter for obstructions. Replace if necessary. If filter is okay, replace EVR solenoid. Connect all vacuum hoses and repeat QUICK TEST.
20. Checking EVP Sensor and EGR Valve. Turn key off and wait 10 seconds. Disconnect EVP sensor. Inspect connector and harness or damage and service as necessary. Remove vacuum line from EGR valve. Test EGR valve operation by manually depressing and releasing the diaphragm. Reconnect vacuum line to EGR valve and electrical connector to EVP sensor. Repeat KOEO and KOER SELF-TEST. If Code 33 is still present, go to next step. If Code 33 is not displayed, the original code was set by poor continuity or a sticking EGR valve. Testing is complete.
21. Checking EGR Valve Vacuum Control. With key off, disconnect EGR valve vacuum supply. Connect a vacuum gauge to EGR valve and apply 2-3 in. Hg for 2 minutes. If EGR holds vacuum, reconnect supply line and go to next step. If EGR valve will not hold vacuum, replace EGR valve.
22. Substitute Known Good EVP Sensor. Turn key off and wait 10 seconds. Install a known good EVP sensor on original EGR valve. Perform KOER SELF-TEST. If Code 33 is present, check EGR valve and/or system for mechanical malfunction. If Code 33 is not present, service or replace original EVP sensor. Repeat QUICK TEST.
23. Service Code 34: EGR Valve Operation, KOER SELF-TEST With EGR Vacuum disconnected. Code 34 indicates that EVP voltage is greater than closed limit voltage of 0.67 volts. Possible causes are: obstructed EVR solenoid filter, faulty EVR solenoid, faulty EGR valve or EVP sensor. Turn key off. Disconnect and plug EGR valve vacuum hose. Perform KOER SELF-TEST. If Code 34 is not present, check EVR filter for obstructions and replace if necessary. If filter is okay, replace EVR solenoid assembly. Reconnect all vacuum hoses and repeat QUICK TEST. If Code 34 is present, go to next step.
24. Checking EVP Resistance, While Applying Vacuum to EGR. Turn key off and wait 10 seconds. Disconnect harness from EVP sensor. Inspect connectors for damaged pins or corrosion. Repair as necessary. Set DVOM on 200K-ohm scale. Disconnect vacuum hose to EGR valve and connect vacuum pump to valve. Measure resistance at EVP sensor between EVP SIGNAL and VREF while gradually increasing vacuum to 10 in. Hg. If reading decreases gradually from no more than 5500 ohms to no less than 100 ohms, check EGR valve for mechanical malfunction and service or replace as necessary. If reading does not change as indicated, replace EVP sensor. Reconnect vacuum hose and repeat QUICK TEST.
25. Continuous Memory Code 32: Check EVP Signal Voltage While Operating EVP Sensor. Code 32 indicates that EGR valve closed further than normal with engine at idle and at normal operating temperature or that EVP sensor has failed with an intermittent low voltage spike symptom. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box and connect ECA to it. Disconnect EGR valve vacuum hose and connect vacuum pump to EGR valve. Set DVOM on 20-volt scale and connect between test pins No. 27 and 46 at breakout box. With KOEO, observe DVOM readings. Slowly apply 6 in. Hg vacuum to EGR valve. Slowly bleed vacuum off EGR valve while lightly tapping on EVP sensor (simulate road shock). If voltage drops to less than.29 volt, the EGR valve may have caused Code 32. Clear Continuous Memory Codes. Check EGR valve for mechanical malfunction and repair or replace as necessary. If voltage does not drop to less than.29 volt, Code 32 fault cannot be duplicated at this time. Testing is complete.
26. Continuous Memory Code 32/31: Check EVP Sensor While In Continuous Monitor Mode. Code 31 indicates sometime during vehicle operation, EVP signal was out of SELF-TEST range. Possible causes are: open or shorted circuit or faulty EVP sensor. Enter KOEO CONTINUOUS MONITOR (WIGGLE) TEST. Observe VOM or diagnostic tester for fault indication while very slowly dappling 6 in. Hg vacuum to EGR valve. Slowly bleed vacuum off EGR valve and lightly tap EVP sensor (simulate road shock). Wiggle EVP sensor connector. If fault is indicated, go to next step. If no fault is indicated, go to step 28).
27. Measure EVP Signal Voltage While Operating EVP Sensor. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector and terminals for obvious damage and repair as necessary. Install breakout box and connect ECA to it. Set DVOM on 20 volt scale. Connect DVOM between test pin 27 and 46 at breakout box. Enter KOEO CONTINUOUS MONITOR test. While observing DVOM, repeat step 26). If fault occurs below 4.25 volts, disconnect and check connectors. If connectors are okay, replace EVP sensor. Clear continuous memory and repeat quick test. If fault did not occur below 4.25 volts, go to next step.
28. Continuous Memory Code 31 and/or 35: EEC-IV Harness Check. Code 31 indicates an open in the EVP SIG or VREF, or a short to SIG RTN with engine at normal operating temperature and at idle. Code 35 indicates a short to VREF and/or VPWR, or an open in SIG RTN with engine at normal operating temperature and at idle. Enter KOEO CONTINUOUS MONITOR Mode. Observe VOM or test indicator for a fault indication while grasping harness close to sensor connector. Wiggle, shake and bend a small section of EEC-IV harness and work toward dash panel. Also check harness from dash panel to ECA. If a fault is indicated, isolate and repair or replace as necessary. Clear continuous memory and repeat quick test. If no fault is indicated, go to next step.
29. Check ECA And Harness Connectors. Turn key off and wait 10 seconds. Disconnect 60-pin ECA connector. Check and repair pins and wiring if necessary. Clear continuous memory and repeat quick test. If connector, pin and wiring are okay, check for intermittent faults, clear continuous memory and check EGR valve diagnosis.
30. Continuous Memory Code 33: Leak Test. Code 33 indicates EGR valve did not open with engine at normal operating temperature and with an EVR solenoid duty cycle present. Turn key off and wait 10 seconds. Disconnect vacuum hose at EGR valve and connect a vacuum pump to the vale. Apply 20 in. Hg to EGR valve. If EGR valve opens and holds vacuum, remove vacuum pump, reconnect EGR valve and go to next step. If EGR valve did not open or hold vacuum, remove pump, reconnect EGR valve. Clear continuous memory Code 33 and diagnosis EGR valve malfunction.
31. EVR Check. Use Continuous Monitor Mode. Observe VOM or diagnostic tester for indication of a fault. Grasp harness close to EVR solenoid connector. Wiggle, shake and bend a small section of the harness, working toward ECA. Inspect connectors and terminals for obvious damage and repair as necessary. If any faults are indicated, isolate and repair. Clear Continuous Memory and repeat quick test. If no fault is indicated, fault cannot be duplicated at this time. Testing is complete.
32. Continuous Memory Code 34: Check EVP Resistance While Applying Vacuum To EGR Valve. EVP circuit indicated that EGR valve was open with engine at normal operating temperature and at idle. Turn key off. Disconnect harness from EVP sensor. Disconnect vacuum hose at EGR valve an attach vacuum pump to EGR valve. Set DVOM on 200K-ohm scale. Measure resistance between EVP SIGNAL and VREF at the EVP sensor. Observe DVOM reading while increasing vacuum to 10 in. Hg. (Scheme 236) If resistance gradually changes from no more than 5500 ohms to no less than 100 ohms, remove vacuum pump and reconnect EGR valve. Clear Continuous Memory Code 34 and go to next step. If resistance did not change as specified, remove vacuum pump and reconnect EGR valve. Clear Continuous Memory Code 34. Check for EGR valve mechanical malfunction.
33. EVR Check. Turn key off. Disconnect vacuum hose from EGR valve and plug hose. Perform KOER SELF-TEST. If Code 34 is present, check EVR filter for obstructions and replace if necessary. If filter is okay, replace EVR solenoid. Connect all vacuum hoses, clear Continuous Memory and repeat QUICK TEST. If Code 34 is not present, fault cannot be duplicated at this time. Testing is completed.

TEST B12 - VSS

Note. Perform this test when Service Code 29 is displayed during QUICK TESTS or when directed here by other test procedures.

Vehicle Speed Sensor Circuit. Scheme 237

To prevent replacement of good components, be aware that the following circuit test is to be used only when Continuous Memory Code 29 is displayed. This test checks vehicle speed sensor, wiring harness, and ECA. Before testing the VSS, perform the following drive cycle procedure on all vehicles.

Automatic Transaxle/Transmission Equipped Vehicles

Record and clear CONTINUOUS SELF-TEST codes. Warm vehicle to normal operating temperature. In Low gear, accelerate moderately to 25 MPH and coast down to idle and then stop. Shut engine off. Perform KOEO SELF-TEST. If Code 29 is present, go to step 1). If not, fault cannot be duplicated at this time. If any other codes are present, return to QUICK TEST. If codes are not present, test is completed.

Manual Transaxle/Transmission Equipped Vehicles

Record and clear CONTINUOUS SELF-TEST codes. Warm vehicle to normal operating temperature. Start in First gear, shift to Second gear, and accelerate moderately to 40 MPH. Coast down to idle and stop. Shut engine off. Perform KOEO SELF-TEST. If Code 29 is present, go to step 1). If not, fault cannot be duplicated at this time. If any other codes are present, return to QUICK TEST. If codes are not present, test is completed.

1. Continuous Memory Code 29. Code 29 indicates there is insufficient input to the ECA from the VSS. Possible causes are: faulty VSS, open or shorted circuit or a faulty ECA. If Code 29 is displayed, go to next step. If not, fault cannot be duplicated at this time.
2. Checking VSS Sensor. Turn key off and wait 10 seconds. Disconnect vehicle speed sensor. Set DVOM on 200K-ohm scale. Measure resistance across vehicle speed sensor. If reading is between 190-240 ohms, go to next step. If reading is incorrect, replace vehicle speed sensor and repeat drive cycle procedure.
3. VSS Harness Continuity. Turn key off and wait 10 seconds. Remove ECA 60-pin connector and inspect for damaged pins, corrosion, or loose wires. Repair as necessary. Install breakout box. With ECA and VSS disconnected, set DVOM on 200-ohm scale. Measure resistance between test pin No. 3 at breakout box and VSS harness connector. Also measure resistance between test pin No. 6 at breakout box and VSS harness connector. If both readings are 5 ohms or less, go to next step. If readings are 5 ohms or more, service open circuit in VSS wiring harness. After repairs, repeat step 1).
4. Checking VSS Harness For Shorts To Power Or Ground. Turn key off. With ECA and VSS disconnected, set DVOM on 200K-ohm scale. Measure resistance between test pin No. 3 and test pins No. 37, 40 and 6 at breakout box. Also measure resistance between test pin No. 6 and test pin No. 37. If all readings are greater than 10K ohms, go to next step. If any reading is less than 10K ohms, repair short(s) in VSS wiring harness. After repairs, repeat step 1).
5. Test By Substitution. Substitute VSS with known good sensor and repeat drive cycle procedure. Connect ECA and VSS. Repeat step 1), and return to this step. If Code 29 is present, replace ECA and repeat step 1). If no code is present, replace original vehicle speed sensor.

TEST B13 - NDS & A/C

Note. Perform this test when Service Code 67 or 79 is displayed during QUICK TESTS or when directed here by other test procedures. This test is designed to diagnose the following

1. A/C input to ECA.
2. Clutch engagement switch.
3. Neutral clutch switch.
4. Neutral drive switch.
5. ECA
6. Harness connector and electrical circuits.

Scheme 238

1. Code 67 System Identification. Code 67 indicates that during engine cranking or KOEO SELF-TEST, signal voltage was greater than specification at test pin No. 10 (A/C input) or test pin No. 30 (NDS). Possible causes for this fault are: A/C circuit shorted to power, Neutral clutch/drive circuits open, Neutral clutch/drive switch open, or a faulty ECA. Go to next step. (Scheme 238): Neutral Gear/Clutch Circuit Diagram NOTE: There is a break in test step sequence between steps 1) and 9). No test steps have been omitted.

Scheme 239

1. 9) Checking A/C Input Voltage. Ensure A/C is switched "OFF". If A/C was on, rerun QUICK TEST. If Code 67 or 79 is displayed, continue with this test. Install breakout box and leave ECA disconnected. With KOEO, set DVOM on 20-volt scale. Measure voltage at test pin No. 10 at the breakout box and chassis ground. If reading is greater than one volt, remove breakout box and repair short in A/C clutch power circuit. If voltage is less than one volt replace ECA, except on vehicles equipped with E4OD transmissions. Vehicles equipped with E4OD transmissions, go to «TEST D25 - E4OD TRANS»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d25-e4od-trans), step 1). Reconnect all components and rerun QUICK TEST.
2. 10) Checking A/C Input Circuit. A low idle with A/C switched "ON" could result in the ECA not receiving or recognizing A/C input on pin No. 10. Turn key off and wait 10 seconds. Disconnect ECA, inspect pins, and install breakout box. Leave ECA disconnected. Set DVOM on 20-volt scale. With KOEO, and A/C on, measure voltage between test pins No. 10 and 40. If voltage is greater than 10.5 volts, replace ECA. Reconnect all components and rerun QUICK TEST. If voltage is less than 10.5 volts, service open in A/C circuit and rerun QUICK TEST. (Scheme 239): A/C Clutch Circuit Diagram
3. 11) Checking Inoperative A/C With High Idle. A high idle condition with the A/C dash switch in the "ON" position may be the result of a lack of signal reaching the A/C clutch. Turn key off and wait 10 seconds. Disconnect ECA, inspect pins, and install breakout box. Leave ECA disconnected. Disconnect A/C clutch connector. Set DVOM on 20-volt scale. With KOEO, turn on A/C. Measure voltage between input pin on fan connector and test pin No. 40 at the breakout box. If voltage is greater than 10.5 volts, go to next step. If voltage is less than 10.5 volts, repair open circuit and rerun QUICK TEST.
4. 12) Check Continuity of A/C Clutch. With KOEO, disconnect A/C clutch harness connector. Measure resistance across both pins of A/C clutch. If resistance is within normal specification of 2.14-3.34 ohms, fault was probably due to faulty connection. If resistance was not within specification repair or replace A/C clutch as necessary.
5. 13) Checking Continuity of A/C Cycle Pressure Switch Circuit. Turn key off and wait 10 seconds. Disconnect ECA, inspect pins, and install breakout box. Leave ECA disconnected. Disconnect A/C cycle pressure switch. Turn on A/C switch. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 43 at the breakout box and battery positive side of the A/C cycle pressure switch. Measure resistance between test pin No. 10 at the breakout box and negative side of the A/C cycle pressure switch connector. If both resistances are less than 5 ohms, EEC-IV system is not at fault. Repair or replace cycle pressure switch. If resistances are greater than 5 ohms, repair open circuit and rerun QUICK TEST.
6. 14) Check A/C Demand and A/C Cycle Pressure Switch For Short to Power. Turn key off. Disconnect ECA, inspect pins, and install breakout box. Leave ECA disconnected. Ensure A/C switch is off. Set DVOM on 20-volt scale. With KOEO, measure voltage between test pin No. 43 and chassis ground. If voltage is greater than 1.0 volt, EEC-IV is not at fault. Repair or replace A/C switches or electrical circuit. If voltage is less than 1.0 volt, reconnect components and check switch operation. If switches are okay, repair short in circuit wiring and rerun QUICK TEST.
7. 15) Checking NDS Circuit For Short to Ground or Closed NDS. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector, inspect pins, and install breakout box. Place transmission in Drive. Set DVOM on 200K-scale. Measure resistance between test pin No. 30 and test pin No. 40 or 60 at breakout box. If resistance is greater than 10K ohms service high idle condition. If resistance is less than 10K ohms, service circuit short or closed NDS and retest.

TEST B14 - BOO SWITCH

Note. Perform this test when Service Code 74 or 75 is displayed during QUICK TESTS or when directed here by other test procedures.

7.5L "E" Series With E4OD Brake ON/OFF (BOO) Circuit. Scheme 240

7.5L "F" Series With E4OD Brake ON/OFF (BOO) Circuit. Scheme 241

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: brake light bulb, brake light switch, or brake light fuse. This test is intended to diagnose a faulty BOO circuit or ECA.

1. Service Code 74: Verify Brake Pedal Was Depressed. If brake was NOT depressed during KOER SELF-TEST, repeat test and depress brake pedal ONLY once during test. Depress and release brake pedal AFTER dynamic response code but before brief WOT. If pedal was depressed, go to next step.
2. Checking Power Circuit. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, and loose wires. Install breakout box, leaving ECA disconnected. Set DVOM on 20-volt scale. Measure voltage between test pins No. 2 and 40 at breakout box, while applying and releasing brake. If voltage cycles, switch circuit is okay, replace ECA and repeat QUICK TEST. If voltage does not cycle, go to next step.
3. Checking For Short To Ground. Turn key off. Leave breakout box installed and ECA disconnected. Set DVOM on 200K-ohm scale. Disconnect BOO circuit. Measure resistance between test pins No. 2 and 40 at the breakout box. If resistance is greater than 10K ohms, repair stoplamp circuit as necessary. If resistance is less than 10K ohms remove breakout box repair short, and repeat KOER SELF-TEST.
4. Service Code 75: Cycle BOO Circuit. Turn key off, wait 10 seconds. Disconnect 60-pin connector. Check and repair wiring as necessary. Install breakout box leaving ECA disconnected. Set DVOM on 20-volt scale. Measure voltage between test pins No. 2 and 40 at the breakout box while depressing and releasing the brake pedal. If voltage cycles, remove breakout box. Replace ECA, and rerun QUICK TEST. If voltage does not cycle, go to next step.
5. Checking BOO Circuit For Short To Power. Turn key off. Install breakout box, leaving ECA disconnected. Set DVOM on 20-volt scale. Disconnect BOO circuit connectors. Measure voltage between test pin No. 2 at the breakout box and engine block ground. If voltage is greater than one volt, remove breakout box, reconnect ECA and repair short circuit. Repeat KOER SELF-TEST. If voltage is less than one volt, go to next step.
6. Check BOO Circuit Continuity. Turn key off. Install breakout box leaving ECA disconnected. Set DVOM on 200-ohms scale. Disconnect BOO harness connectors. Measure resistance between test pin No. 2 at breakout box and BOO signal at connector. If resistance is less than 5 ohms, fault is in lighting system stoplight circuit. Repair or replace as necessary. If greater than 5 ohms, remove breakout box, reconnect ECA, repair open circuit and repeat KOER SELF-TEST.
7. Service Code 74: Verify Brake Pedal Was Depressed. Code 74 indicates that brake was NOT depressed during KOER SELF-TEST, the BOO signal did not cycle high and low. Repeat test and depress brake pedal ONLY once during test. Depress and release brake pedal AFTER dynamic response code, but before brief WOT. If pedal was depressed, go to next step. If voltage did not cycle, repeat KOER SELF-TEST and depress brake pedal once during test.
8. Checking BOO Circuit Cycling. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, and loose wires. Install breakout box, leaving ECA disconnected. Set DVOM on 20-volt scale. Measure voltage between test pins No. 2 and 40 at breakout box while applying and releasing brake. If voltage cycles, switch circuit is okay, replace ECA and repeat QUICK TEST. If voltage does not cycle, go to next step.
9. Checking Continuity of BOO Circuit. Turn key off. Leave breakout box installed and ECA disconnected. Set DVOM on 200-ohm scale. Disconnect BOO circuit connector. Measure resistance between test pin No. 2 at breakout box and BOO circuit harness connector (12A581). If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, remove breakout box, reconnect ECA, repair open circuit, and repeat KOER SELF-TEST.
10. Checking BOO Circuit For Short to Power. Turn key off. Install breakout box, leaving ECA disconnected. Set DVOM on 20-volt scale. Disconnect BOO circuit connector (12A581 to 14290 or 14401 Connectors). Measure voltage between test pin No. 2 at the breakout box and engine block ground. If voltage is greater than 1.0 volt, remove breakout box, reconnect ECA, repair short circuit, and repeat KOER SELF-TEST. If voltage is less than 1.0 volt, go to next step.
11. Check BOO Circuit For Short to Ground. Turn key off. Leave breakout box installed and ECA disconnected. Set DVOM on 200K ohm scale. Disconnect BOO circuit connector (12A581 to 14290 or 14401 Connectors). Measure resistance between test pin No. 2 and test pin No. 40 at the breakout box. If resistance is greater than 10K ohms, repair stoplamp circuit as necessary. If resistance is less than 10K ohms remove breakout box repair short, and repeat KOER SELF-TEST.

TEST B15 - PSPS

Note. Perform this test when Service Code 52 is displayed during QUICK TESTS or when directed here by other test procedures. Some vehicles ECA's may be equipped with PSPS software strategy but do not have power steering. If a KOEO Code 52 is displayed, check to see that vehicle is equipped with power steering. If not, disregard Code 52.

Power Steering Pressure Switch (PSPS) Circuit. Scheme 242

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.

Note. When a service Code 52 is received in KOEO test and vehicle is not equipped with Power Steering, disregard Code 52 and service all other Codes.

1. Attempt To Eliminate Code 52. Code 52 indicates that PSPS circuit is open. Turn key off and wait 10 seconds. Disconnect PSPS. Install a jumper wire between PSPS CKT and SIG RTN at harness connector. (Scheme 242) Repeat KOEO SELF-TEST. If Code 52 is not displayed, replace PSPS and repeat QUICK TEST. If Code 52 is still displayed, go to next step.
2. PSPS Harness Check. Turn key off and wait 10 seconds. Disconnect PSPS and ECA 60-pin connector. Inspect and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale and measure resistance between test pin No. 46 at breakout box and SIG RTN at the PSPS harness connector. Also measure resistance between PSPS CKT at the harness connector and test pin No. 24 at breakout box. If both readings are less than 5 ohms, replace ECA. Repeat QUICK TEST. If readings are greater than 5 ohms, repair open in circuit. Repeat QUICK TEST.
3. Checking Switch Integrity. Connect tachometer and start engine. Allow engine to idle in Park or Neutral. Disconnect PSPS at switch. If RPM increases, replace PSPS. If RPM does not increase, go to next step.
4. Checking PSPS Harness. Turn key off and wait 10 seconds. Disconnect PSPS and ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 24 and test pin No. 46 at the breakout box. If resistance is 10K ohms or less, repair short in harness. If reading is greater than 10K ohms, replace ECA. Repeat QUICK TEST.
5. KOER SELF-TEST Service Code 52 Displayed. If you turned steering wheel 1/2 turn within 1-2 seconds AFTER engine ID code, but BEFORE dynamic response code, go to next step. If steering wheel was not turned, ensure front wheels are centered (no load condition). Repeat QUICK TEST.
6. Checking ECA Open Circuit Identifying Capabilities. Turn key off and wait 10 seconds. Disconnect PSPS. Perform KOEO SELF-TEST. If Code 52 is present, go to step 8). If Code 52 is not present, go to next step.
7. PSPS Harness Check. Turn key off and wait 10 seconds. Disconnect PSPS and ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Install breakout box, leaving ECA disconnected, and set DVOM on 200K-ohm scale. Measure resistance between test pins No. 46 and 24 at breakout box. If reading is 10K ohms or less, repair short circuit and repeat QUICK TEST. If reading is 10K ohms or more, replace ECA and repeat QUICK TEST.
8. PSPS Position Comparison. Turn key off and wait 10 seconds. Install breakout box and connect ECA to it. Connect PSPS. Set DVOM on 200-ohm scale. Turn key on and measure resistance between test pins No. 24 and No. 46 at breakout box. Start engine. If resistance remains less than 10 ohms between KOEO and KOER, go to next step. If not, go to step 11).
9. PSPS Position: Load/No Load. Install breakout box and connect ECA to it. Connect PSPS and set DVOM on 200-ohm scale. Start engine and allow it to idle. Measure resistance between test pins No. 24 and No. 46 at breakout box. Turn steering wheel at least 1/2 turn and return. If reading changes from less than 10 ohms to infinity (indicating PSPS opening) and then returns to 10 ohms or less when steering wheel is returned to centered, PSPS system is okay. Remove breakout box and return to QUICK TEST. If reading did not change as indicated, go to next step.
10. PSPS Always Closed VS. Low Hydraulic Pressure. At this point, there are only 2 possible causes for the original Code 52. They are a PSPS switch that will not open, or low available hydraulic pressure. Turn key off and wait 10 seconds. Substitute original switch with a known good PSPS switch. Perform KOER SELF-TEST and turn steering wheel at least 1/2 turn after engine ID code. If Code 52 is still present, check for low hydraulic pressure. If Code 52 is not present, replace original PSPS switch. Service other codes if necessary.
11. PSPS Always Open VS. High Hydraulic Pressure. At this point, there are only 2 possible causes for original Code 52. They are a PSPS switch that is always open, or excessively high hydraulic pressure. Turn key off and wait 10 seconds. Substitute original switch with a known good PSPS switch. Perform KOER SELF-TEST and turn steering wheel at least 1/2 turn after engine ID code. If Code 52 is still present, check for high hydraulic pressure. If Code 52 is not present, replace original PSPS switch. Service other codes if necessary.

TEST B16 - RPM SENSOR

Note. You should perform this test when Code 14 is displayed, or when directed here by other test procedure. To prevent replacement of good components, ensure the RPM sensor is installed correctly and electrical connection is complete. This circuit test is intended to diagnose only the following: engine RPM sensor, sensor harness circuits and ECA.

RPM Sensor Circuit. Scheme 243

1. Continuous Memory Code 14: Erratic Engine RPM Signal. Code 14 indicates RPM signal output was missing pulses while the engine is running. Check EEC-IV system harness for loose wires or connectors, and the present of an onboard telephone or 2-way radio. If a telephone or 2-way radio is installed, ensure manufacturers cable routing instructions and specifications have been followed. With KOEO, enter Continuous Monitor Mode. Observe tester while lightly tapping sensor and "Wiggle" testing sensor connector. It may be necessary to reenter Continuous Monitor Mode during test if when a fault is found. If a fault is indicated, repair fault as necessary, and rerun QUICK TEST. If a fault is not found, go to next step.
2. Checking EEC-IV Harness. While still in Continuous Monitor Mode as in step 1), observe test meter for a fault indication while performing "Wiggle" test on harness from sensor to ECA. If a fault is indicated, isolate and repair as necessary. Clear Code 14 and repeat QUICK TEST. If a fault is not found, go to next step.
3. Checking Continuity Of Engine RPM Sensor Harness. If an engine I.D. code other than "5" is received during the KOER Self-Test, a faulty or disconnected engine RPM sensor may be the cause. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Insect pins and wiring at connector for corrosion or damage, repair as necessary. Install breakout box, leaving ECA disconnected. Disconnect RPM sensor. Set DVOM on 200k-ohm scale. Measure resistance between test pin No. 4 at the breakout box and the RPM sensor harness connector. Measure resistance between test pin No. 44 at the breakout box and the RPM sensor harness connector. If both resistances are less than 5 ohms, go to next step. If not, repair open circuit as necessary. Remove breakout box, reconnect ECA and rerun QUICK TEST procedure.
4. Check Engine RPM Sensor Harness For Short To Power Or Ground. Turn Key off and install breakout box, leaving ECA disconnected. Disconnect RPM sensor. Set DVOM on 200k-ohm scale. Measure resistance between test pins No. 4 and 37/57, 40 and 44 at the breakout box. Measure the resistance between test pin No. 44 and test pins No. 37/57 at the breakout box. If all resistances are greater than 10k-ohms, go to next step. If not, repair short circuit and rerun QUICK TEST procedure.
5. Checking RPM Sensor. With key off and engine RPM sensor disconnected, set DVOM on 200k-ohm scale. Measure resistance between engine RPM sensor terminals at the RPM sensor. If resistance is 2400-2800 ohms, replace ECA, reconnect sensor and rerun QUICK TEST procedure. If resistance is within specifications, repair or replace sensor as necessary.

TEST B17 - FIPL SENSOR

Note. You should perform this test when Code 23, 53 or 63 is displayed, or when directed here by other test procedure. To prevent replacement of good components, ensure the following non-EEC-IV are not at fault: idle speed and throttle stop adjustment, binding or sticking throttle shaft/linkage or speed control linkage. This circuit test is intended to diagnose only the following: FIPL sensor, sensor harness circuits and ECA.

FIPL Sensor Circuit. Scheme 244

Scheme 245

Scheme 246

Scheme 247

1. Service Code 23: Checking For Stuck Throttle Plate. Visually inspect throttle linkage for binding or sticking. Ensure linkage is capable of moving freely to the fully closed position. If linkage is okay, go to next step. If not, service or replace as necessary.
2. Service Code 53: Attempt To Set Code 63. Turn key off and wait 10 seconds. Disconnect FIPL sensor harness connector at throttle body. Inspect for damaged pins, corrosion or loose wires. Service or repair as necessary. Repeat KOEO SELF-TEST. If Code 63 is present, go to next step. If not, go to step 4). Ignore all other codes at this time.
3. Checking Voltage At VREF To SIG RTN. Turn key off and wait 10 seconds. Disconnect FIPL sensor harness connector at throttle body. Inspect for damaged pins, corrosion or loose wires. Service or repair as necessary. Set DVOM on 20-volt scale. With KOEO, measure voltage between VREF and SIG RTN at FIPL harness connector. (Scheme 244) If voltage is 4-6 volts, go to step 9) for FIPL adjustment procedures. If not 4-6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1).
4. Check FIPL Signal For Short To Power. Turn key off and wait 10 seconds. Ensure FIPL sensor harness is disconnected and DVOM is set on 200K-ohm scale. Disconnect ECA 60-pin connector. Inspect for damaged pins, corrosion or loose wires. Service or repair as necessary. Install breakout box, leaving ECA disconnected. Measure resistance between test pin No. 47 and test pins No. 26 and 57 at the breakout box. If both resistances are greater than 10k-ohms, remove breakout box, replace ECA, reconnect FIPL and repeat QUICK TEST procedure. If resistance is not greater than 10k-ohms, repair short circuit, remove breakout box, reconnect FIPL sensor and repeat QUICK TEST.
5. Service Code 63: Attempt To Set Code 53. Turn key off and wait 10 seconds. Disconnect FIPL harness connector. Connect a jumper wire between VREF and FIPL at FIPL vehicle harness connector. Perform KOEO Self-Test. If no codes are generated, go directly to step 8). If Code 23 or 53 is present, remove jumper wire and go to step 9) for FIPL sensor adjustment procedure. If Code 23 or 53 is not present, go to next step. Ignore other codes at this time.
6. Code 63: Checking Voltage From VREF To SIG RTN. Turn key off and wait 10 seconds. Disconnect FIPL vehicle harness connector at throttle body. Inspect for damaged pins, corrosion or loose wires. Service or repair as necessary. Set DVOM on 20-volt scale. With KOEO, measure voltage between VREF and SIG RTN at FIPL vehicle harness connector. If voltage is 4.0-6.0 volts, go to next step. If not, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE.
7. Checking Continuity Of FIPL Circuit. Turn key off and wait 10 seconds. Set DVOM on 200-ohm scale and disconnect FIPL harness connector. Disconnect ECA 60-pin connector. Inspect for damaged pins, corrosion or loose wires. Service or repair as necessary. Install breakout box and connect ECA. Measure resistance between FIPL at vehicle harness connector and test pin No. 47 at the breakout box. If resistance is less than 5.0 ohms, go to next step. If not, repair open circuit and retest.
8. Checking Resistance Of FIPL Circuit To Ground And/Or SIG RTN. Turn key off and wait 10 seconds. Disconnect FIPL harness connector. Disconnect ECA 60-pin connector. Inspect for damaged pins, corrosion or loose wires. Service or repair as necessary. Set DVOM on 200K-ohm scale. Measure resistance between FIPL at vehicle harness connector and test pin No. 46 at the breakout box and between FIPL, at vehicle harness connector, and ground. If resistance is greater than 10k ohms, remove breakout box and replace ECA. Reconnect components and retest. If resistances are not greater than 10k ohms, repair short circuit, reconnect components and retest.
9. Checking FIPL Sensor Adjustment. Perform KOEO Self-Test with throttle in WOT position. Remain in Self-Test after last service code is displayed. Place a.515 in (13.08 mm) Rotunda Gauge Block (T83T-7B200-AH ) between the Max Throttle Travel Screw and the Gauge Boss. (Scheme 245)& 31. Cycle Overdrive Cancel Switch (OCS) once. Observe Self-Test Output (STO) signal at VOM, DVOM or STAR tester. A constant signal (light or tone) indicates the signal is within range. An erratic or broken signal indicates adjustment is required. CAUTION: DO NOT turn the Max Throttle Travel Screw. This screw has been preset and should not be tampered with. If adjustment is required (Scheme 247) If FIPL sensor and bracket screws are tight and there are no signs of wear at any contact points, loosen FIPL sensor attachment screws and rotate sensor in either direction until a constant signal is obtained. Tighten attachment screws, remove Rotunda Gauge Block and rerun QUICK TEST. If bracket is loose or shows signs of wear, remove epoxy from bracket mounting screw heads. Loosen bracket screws and turn FIPL bracket assembly into adjustment range. Retighten screws and apply epoxy to screw heads. Remove gauge block and rerun QUICK TEST. If service codes are present after adjustment procedure, replace FIPL sensor. (Scheme 245): Top View of Fuel Injection Pump (Scheme 246): Throttle Side View of Fuel Injection Pump (Scheme 247): FIPL Side View of Fuel Injection Pump
10. Code 53: Monitor FIPL Circuit Under Simulated Road Shock Conditions. Enter KOEO Continuous Monitor Mode. Observe VOM or STAR LED for indication of a fault while performing the following procedures. Move throttle slowly to the WOT position. Release throttle slowly to closed position and lightly tap on FIPL sensor to simulate road shock. Wiggle FIPL harness connector. If a fault is indicated, go to next step. If a fault is not indicated, go to step 12).
11. Measure FIPL Position Signal Voltage While Exercising FIPL Sensor. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for damaged pins, corrosion or loose wires. Service or repair as necessary. Install breakout box and connect ECA. Ensure tester is connected to STO as in previous step. Connect a DVOM between test pins No. 46 and 47. Set DVOM on 20-volt scale. With KOEO, observe DVOM while repeating procedure in step 10). If a fault is indicated at less than 4.25 volts, disconnect and inspect connectors. If connector and terminals are okay, clear codes and go to step 9). If a fault does not occur at less than 4.25 volts, ensure harness and connectors are okay and go to next step.
12. Check EEC-IV Harness. Ensure vehicle is still in KOEO Continuous Monitor Mode. Observe tester for a fault indication while performing wiggle test on system harness and connectors. If a fault is indicated, isolate it and repair as necessary. Clear codes and repeat QUICK TEST. If a fault is not indicated, go to next step.
13. Checking ECA Harness and Connectors. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for damaged pins, corrosion or loose wires. Service or repair as necessary. If connectors and terminals are okay, fault may not be duplicated at this time. Clear continuous memory codes. If a fault is found, repair as necessary, clear codes and rerun QUICK TEST.
14. Continuous Memory Code 63: Monitor FIPL Circuit Under Simulated Road Shock. Enter KOEO Continuous Monitor mode. Observe tester while performing the following. Move throttle slowly to WOT position. Release throttle slowly to closed position and lightly tap on FIPL sensor to simulate road shock. Wiggle FIPL harness connector. If a fault is indicated, inspect connectors and clear codes. Rerun QUICK TEST and go to step 9). If a fault is not indicated, go to next step.
15. Checking EEC-IV Harness. Ensure vehicle is still in KOEO Continuous Monitor Mode. Observe tester for a fault indication while performing wiggle test on system harness and connectors. If a fault is indicated, isolate it and repair as necessary. Clear codes and repeat QUICK TEST. If a fault is not indicated, go to next step.
16. Checking ECA Harness and Connectors. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for damaged pins, corrosion or loose wires. Service or repair as necessary. If connectors and terminals are okay, fault may not be duplicated at this time. Clear continuous memory codes. If a fault is found, repair as necessary, clear codes and rerun QUICK TEST.

TEST C1 - FUEL CONTROL

Note. Perform this test when Service Code 41, 91, 42, 92, 43, 65, 85, 86 or 93 is displayed during QUICK TESTS or when directed here by other test procedures.

Note. See HOW TO USE CIRCUIT TESTS, at beginning of circuit tests before performing this test. Fuel contaminated engine oil may affect Service Codes 41, 91 and 42, 92. If this is suspected, remove PCV valve from valve cover and repeat QUICK TEST. If problem is corrected, change engine oil and filter.

To prevent replacement of good components, be aware of the following non-EEC areas which may be cause of driveability concerns

1. Ignition coil, distributor cap or rotor
2. Faulty spark plugs or wires
3. Faulty CANP system
4. DIS ignition system
5. EGR valve and gasket
6. Air filter
7. Fuel or engine oil contamination
8. Poor electrical ground
9. Faulty fuel pressure
10. Intake or exhaust manifold leaks
11. Engine below normal operating temperature

This test is intended to diagnose only the following components

1. HEGO sensor
2. HEGO signal and ground circuit
3. HEGO sensor connection
4. Vacuum systems
5. Fuel injector
6. ECA
7. Electrical circuits HEGO GRD, HEGO, INJ 1-8, and VPWR

INDIVIDUAL INJECTOR RESISTANCE (1)

INJECTOR BANK RESISTANCE

FUEL PRESSURE SPECIFICATIONS: psi (kg/cm 2 )

MPFI Test Schematic. Scheme 248

1. Checking Fuel Pressure. Turn ignition key off, wait 10 seconds. Install fuel pressure gauge. Verify that manifold vacuum supply is connected to fuel pressure regulator (if equipped). Run engine at idle and check fuel pressure. If vehicle will not start, cycle key on and off several times. See «FUEL PRESSURE SPECIFICATIONS»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) table. If fuel pressure is within specification, go to next step. If pressure is not to specification, remove fuel pressure gauge. Repair electric fuel pump or fuel pressure regulator.
2. Checking Fuel Pressure Check Valve. With KOEO, check that fuel pressure remains to specification for approximately 60 seconds. If system holds pressure, go to next step. If system does not hold pressure, go to step 6).
3. Fuel Delivery Test. Ensure fuel is of good quality. With key off, install fuel pressure gauge and pressurize fuel system as in step 1). Disconnect inertia switch. Crank engine for 5 seconds. If fuel pressure drop is greater than 5 psi after 5 seconds of cranking, the EEC-IV system is not the cause of the no start condition. Check additional DIAGNOSIS BY SYMPTOM tests. Reconnect inertia switch and remove fuel pressure gauge. If problem is rough running, missing, or a fuel service code, go to next step. If fuel pressure drop is less than 5 psi, remove fuel pressure gauge, reconnect inertia switch, and go to next step.
4. Checking Injector and Harness Resistance. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect pins for damage. Install breakout box, leave ECA disconnected, and set DVOM on 200-ohm scale. Measure resistance of injector banks between test pins No. 37 and 58 (bank No. 1) or 59 (bank No. 2) at breakout box. Record resistance. Refer to «INJECTOR BANK RESISTANCE»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) table. Compare resistance with appropriate specification in «INJECTOR BANK RESISTANCE»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) table. If injector is within specification, go to step 6). If injector is not within specification, go to next step.
5. Isolating Faulty Injector Circuit. Turn key off. Install breakout box leaving ECA disconnected. Disconnect all injectors on suspect bank. With DVOM set on 200-ohm scale, connect one injector and measure resistance between test pins No. 37 and 58 or 59. Disconnect injector and repeat process for all other injectors. See «INDIVIDUAL INJECTOR RESISTANCE»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing) table for specifications. If injectors are within specifications, go to step 6). If injectors are not to specification, remove breakout box, reconnect ECA and injectors. Repair open/short in injector harness. If okay, replace injector. Rerun QUICK TEST.
6. Checking Injector Drive Signal. With key off and breakout box installed, connect ECA to breakout box. Using a non-powered 12 volt test light, connect test light between test pins No. 37 and 58 at the breakout box. Connect light between test pins No. 37 and 59 at the breakout box. Crank or start engine. A properly operating system will show a dim glow on test light. If light glows dim, go to next step. If test light does not come on, verify 12 volts at test pins No. 37 and 57. If test light glows bright, check injector circuit for shorts to ground. If okay, remove breakout box and replace ECA. Rerun QUICK TEST.
7. Fuel Pressure Problems: External Sources. Pressurize fuel system as per step 1). Visually inspect, fuel injector "O" rings, fuel pressure regulator, and fuel rails. If there is a visible leak, remove pressure gauge. Repair leak as necessary. Rerun QUICK TEST. If there is no leak, go to next step
8. Injector Balance Test. Connect tachometer to engine. Start and run engine at idle. Disconnect and reconnect injectors one at a time. Note RPM drop for each injector. Each injector should produce a momentary RPM drop of about 100 RPM drop. Note that ISC will attempt to re-establish correct RPM. If each injector does not produce at least 100 RPM drop when disconnected, service or replace faulty injector(s) and repeat QUICK TEST. If RPM drop is correct for all injectors, fuel delivery is okay. Problem is in area common to all cylinders such as a vacuum leak, fuel contamination, EGR, etc.
9. This step procedure does not apply to trucks.
10. Service Code 41/91: Fuel Control Always Lean. If vehicle is equipped with dual HEGO's, Code 41 refers to the Right, or No. 1 HEGO and Code 91 refers to the Left, or No. 2 HEGO. Run engine at 2000 RPM for 2 minutes. Turn key off and wait 10 seconds. Rerun KOER SELF-TEST. Check for Code 41 or 91. If Code 41 or 91 is not displayed, go to step 19). If Code 41 and 91 is displayed, go to appropriate step number listed below. Engines equipped with MAP sensors: Go to next step. Engines equipped with VAF meters: Go to step 12). Engines equipped with MA meters: Go to step 13).
11. Checking HEGO Sensor on Engines With MAP Sensors. Turn key off and set DVOM on 20-volt scale. Disconnect appropriate HEGO sensor from vehicle harness. Connect DVOM to HEGO SIGNAL lead at sensor and engine ground. Disconnect and plug vacuum line at MAP sensor. Apply 10-14 in. Hg vacuum to Manifold Absolute Pressure (MAP) sensor. Start engine and run engine at 2000 RPM for 2 minutes. If reading is less than 0.5 volt within 2 minutes, replace HEGO sensor(s) and then repeat QUICK TEST. If reading is greater than 0.5 volt within 2 minutes, go to step 14). If reading is less than 0.5 volt within 2 minutes, replace HEGO sensor, reconnect MAP, and rerun QUICK CHECK. NOTE: Vacuum or air leaks in non-EEC-IV related areas may cause Code 41 or 91. Check the following areas: A/C control motor, engine seals, EGR system, PCV system and lead contamination of HEGO sensor.
12. Checking HEGO Sensor on Engines With VAF meters. With key off and DVOM set on 20-volt scale, disconnect HEGO sensor from harness. Connect DVOM between HEGO SIGNAL at sensor and engine ground. Remove air cleaner in order to reach airflow meter inlet. Use a pencil to prop air meter door in partially open position. Start and run engine at 2000 RPM for 2 minutes. If reading is not greater than 0.5 volt within 2 minutes, replace HEGO sensor and repeat QUICK TEST. If reading is greater than 0.5 volt within 2 minutes, go to step 14).
13. Checking HEGO Sensor on Engines With MA Sensor. The purpose of this test is to verify HEGO sensor can generate a voltage signal of greater than 0.5 volt during KOER SELF-TEST. With key off and DVOM set on 20-volt scale, disconnect HEGO sensor from harness. Connect DVOM between HEGO SIGNAL at sensor and battery negative post. Rerun KOER SELF-TEST and monitor HEGO sensor voltage. If voltage is greater than 0.5 volt at end of SELF-TEST, go to next step. If voltage is less than 0.5 volt at end of SELF-TEST, replace HEGO sensor and rerun QUICK TEST.
14. Checking Continuity of HEGO Signal and Ground Circuits. Turn key off. Install breakout box, leaving ECA and HEGO disconnected. Set DVOM on 200-ohm scale and measure resistance between test pin No. 49 and battery negative post. Measure resistance between test pin No. 29 and HEGO SIGNAL at vehicle harness connector. For vehicles with dual HEGO sensors, measure resistance between test pin No. 43 and HEGO SIGNAL at vehicle harness connector. If all readings are greater than 5 ohms, repair open in appropriate circuit, connect HEGO sensor and ECA, and repeat QUICK TEST. If all readings are less than 5 ohms, go to next step.
15. Checking HEGO Circuit For Short to Ground. Turn key off. Leave breakout box installed and ECA disconnected. Disconnect HEGO sensor and set DVOM on 200K-ohm scale. Measure resistance between test pin No. 29 and test pin No. 40 at the breakout box. For vehicles with dual sensors measure resistance between test pin No. 43 and test pin No. 40. If any reading is less than 10K ohms, repair short to ground and repeat QUICK TEST. If reading is 10K ohms or more, go to next step.
16. Checking HEGO Sensor For Short to Ground. With key off, breakout box installed, and ECA disconnected, set DVOM to 200K-ohm scale. Disconnect HEGO sensor. Measure resistance between PWR GND and HEGO SIGNAL at the HEGO sensor connector. If resistance is less than 10K ohms, replace HEGO sensor and rerun QUICK TEST. If resistance is greater than 10K ohms, do the appropriate following procedure: Engines equipped with MAP sensor: Go to next step. Engines equipped with VAF meter: Go to step 18). Engines equipped with MA (Mass Air Sensor): Remove breakout box, reconnect HEGO sensor, replace ECA and rerun QUICK TEST.
17. Eliminating Code 41: Engines With MAP Sensor. Turn key off. Install breakout box and connect ECA and HEGO sensor. Ensure MAP sensor vacuum hose is disconnected and plugged. Apply 10-14 in. Hg to MAP sensor. Start and run engine at 2000 RPM for 2 minutes. Allow engine to return to idle. Perform KOER SELF-TEST. If Code 41 is still present, check ECA connector for corroded or damaged pins. If connector is okay, replace ECA. Connect MAP sensor vacuum hose and repeat QUICK TEST. If Code 41 is not present, connect MAP sensor vacuum hose. HEGO input circuit is okay. Return to step 1).
18. Eliminating Code 41: Engines With VAF Meter. With key off, install breakout box and connect ECA. Reconnect HEGO sensor. Remove air filter and insert a pencil in VAF meter inlet. Start engine and run at 2000 RPM for approximately 2 minutes. Rerun SELF-TEST. If Code 41 is not present, the HEGO circuit is okay, Remove breakout box, reconnect ECA and go to step 1) of this test. If Code 41 is displayed, remove test set-up, replace ECA, and rerun QUICK TEST.
19. Checking Resistance of HEGO Heating Element. Turn key off, disconnect HEGO sensor, and set DVOM on 200-ohm scale. Measure resistance between KEY POWER circuit and POWER GROUND circuit at HEGO connector. Hot-to-warm resistance should be 5-20 ohms. Room temperature resistance is 2-5 ohms. If resistance is within specification, go to next step. If resistance is not within specifications, replace HEGO sensor and rerun QUICK TEST.
20. Checking Power at HEGO Harness Connector. With KOEO, and HEGO disconnected, set DVOM on 20-volt scale. Measure voltage between KEY POWER circuit and POWER GROUND circuit at HEGO harness connector. If voltage is greater than 10.5 volts, HEGO system is okay, go to step 1) of this test. If voltage is less than 10.5 volts, go to next step.
21. Checking Continuity of Power Ground Circuit. Turn key off and wait 10 seconds. Disconnect HEGO sensor and set DVOM on 200-ohm scale. Measure resistance between POWER GROUND circuit at HEGO vehicle harness connector and battery negative post. If resistance is less than 5 ohms, repair open in KEY POWER circuit and rerun QUICK TEST. If resistance is more than 5 ohms, reconnect HEGO sensor and repair open in POWER GROUND circuit. Rerun QUICK TEST.
22. Service Code 42/92: Fuel Control Rich, Check HEGO SIGNAL For Short To Power. On dual HEGO systems, Code 42 refers to right side HEGO, Code 92 refers to left side HEGO. Turn key off and wait 10 seconds. Disconnect appropriate HEGO sensor. Set DVOM on 20-volt scale. With KOEO, measure voltage between HEGO SIGNAL and POWER GROUND at HEGO harness connector. If reading is more than .5 volt, repair short to power in HEGO circuit. Repeat QUICK TEST. If reading is less than 0.5 volt, go to next step.
23. Checking HEGO Sensor For Short to Key Power Circuit. Turn key off and leave HEGO disconnected. Set DVOM on 200K-ohm scale. Measure resistance from KEY POWER circuit to HEGO SIGNAL circuit at HEGO sensor connector. If reading is 10K ohms or less, replace HEGO sensor and repeat QUICK TEST. If reading is greater than 10K ohms, go to next step.
24. Attempt to Generate Code 41/91. The following non-EEC areas may cause these codes: fuel contaminated engine oil, ignition misfire and faulty CANP system. Turn key off and wait 10 seconds. Disconnect appropriate HEGO sensor. Using jumper wire, connect HEGO SIGNAL circuit at HEGO harness connector to battery negative terminal. Repeat KOER SELF-TEST. If Codes 41/91 are present, remove jumper wire and go to next step for engines with MAP. All others, go to step 27). If codes 41/91 are not present, remove jumper wire. Disconnect ECA connector and inspect for damage. If connector is okay, replace ECA. Repeat QUICK TEST. NOTE: Because the MAP sensor has a large influence on fuel control, a Code 42/92 may be the result of a faulty MAP sensor, even though a Code 22 has not been set. The next 2 test steps will verify the MAP vacuum circuit.
25. Checking MAP Sensor For Vacuum Leaks. Turn key off and wait 10 seconds. Disconnect vacuum hose from MAP sensor and connect vacuum pump to sensor. Apply 18 in. Hg of vacuum to MAP sensor. If sensor does not hold vacuum, replace MAP sensor. Connect vacuum hose and repeat QUICK TEST. If MAP holds vacuum, release vacuum and go to next step.
26. Checking For Loss of Vacuum to MAP Sensor. Using vacuum "T", connect vacuum gauge in intake manifold vacuum hose at MAP sensor. Start engine and note vacuum reading. Turn key off and wait 10 seconds. Remove "T" and vacuum gauge. Reconnect hose to MAP sensor. Connect vacuum gauge at a different intake manifold location. Start engine and note vacuum reading. If readings differ by more than one in. Hg, inspect vacuum hoses for leaks, kinks, or blockage. Repair as required. If readings are within one in. Hg of each other, go to next step.
27. HEGO Sensor Check. Turn key off and wait 10 seconds. Disconnect HEGO sensor. Set DVOM on 20-volt scale and connect to HEGO SIGNAL at HEGO sensor connector and negative battery post. disconnect PCV valve hose to create a vacuum leak, which will cause the HEGO sensor to go lean. Start engine and run at 2000 RPM. The DVOM should indicate 0.4 volt within 30 seconds. If voltage is within specification, HEGO is okay, go to step 1) of this test. If voltage is not within specification, replace HEGO sensor and repeat QUICK TEST.
28. Continuous Memory Code 41 or 91. Indicates that a HEGO circuit has not switched during closed loop fuel control. In this situation a Code 41 or 91 may not indicate a lean condition. Diagnose all other driveability complaints in the DIAGNOSIS BY SYMPTOM test before attempting to service a Continuous Memory Code 41 or 91. Check the following areas. Unmetered Air/Vacuum Leaks Canister Purge System PVC System Engine Sealing Crimped Fuel Lines Plugged Fuel Filter Fouled Injectors HEGO Fuel Fouled If an over-rich condition is suspected of fouling the HEGO sensor, run the vehicle at sustained high (legal) speeds followed by a few hard acceleration runs. This will allow the HEGO contamination to be burned off. Ignition System Check for DEFAULT base timing in QUICK TEST procedure. Improper Fuel Used Lead Fouled HEGO Sensor. Fuel Pressure Check Pressure Using Steps 1) and 2). TP Sensor With KOEO, move throttle slowly to WOT. Measure voltage between test pins No. 47 and 46 at breakout box. If voltage does not increase with throttle opening, replace TP sensor or linkage as necessary. If vehicle still has driveability problems, perform test steps 3) through 6).
29. Continuous Memory Codes 41, 42, 43, 65, 85 or 86. Diagnose all other driveability complaints before servicing these codes. Code 41 - HEGO indication that the fuel system was lean for more than 15 seconds when the fuel system should have been in closed loop fuel control. Code 42 - HEGO indication that the fuel system was rich for more than 15 seconds when the fuel system should have been in closed loop fuel control. Code 43 - HEGO indicated that the fuel system was lean during WOT for more than 3 seconds. Code 65 - Closed loop not activated on HEGO switching. Code 85 - Excessive rich mixture condition corrected by adaptive fuel strategy. Code 86 - Excessive lean mixture condition corrected by adaptive fuel strategy. If an over-rich fuel condition is suspected or experienced, check ignition system. Burn off fuel deposits on HEGO by operating the vehicle at sustained high (legal) speeds followed by a few hard acceleration runs. This will allow the HEGO contamination to be burned off. Check the following areas: Code 41 Intermittent HEGO signal (Signal or Ground circuit). If Code 65 also present, repair faulty HEGO circuit (Signal or Ground circuit). If Code 43 also present, service Code 43 first. Check VAF for leaks or sticking (caused by contamination or frost). Low fuel pressure at WOT, check fuel supply. Low fuel flow at WOT (pressure okay), check clogged injectors or low battery voltage. Code 42 Intermittent HEGO signal (Signal or Ground circuit). Airflow meter indicating incorrect airflow, check for high voltage output due to sticking air vane ("flapper door"). Excessive fuel flow, pressure regulator vacuum supply disconnected or blocked fuel return line. Excessive fuel flow, damaged or stuck open injector(s). Code 41 and 42 Intermittent HEGO signal (Signal or Ground circuit). Sticking air vane ("flapper door"), due to contamination. Contaminated HEGO sensor, lead or silicone fouled. Code 43 Low fuel pressure at WOT, fuel pump or restricted supply. Low fuel flow at WOT, injectors plugged or low battery voltage (less than 11 volts). Code 65 Check for faulty HEGO signal (Signal or Ground circuit). Code 85 If Code 42 also displayed, service it first. Excessive fuel pressure, check regulator vacuum line and fuel supply line. Excessive fuel flow, check for damaged injector pintles or injector stuck open. Code 86 If Code 41 also displayed, service it first. Low fuel pressure, low pressure pump or restricted fuel supply. Low fuel flow, clogged injectors or low battery voltage.

TEST C2 - INERTIA SWITCH

Note. Perform this test when Service Code 87, 95, or 96 is displayed during QUICK TESTS or when directed here by other test procedures.

Fuel Pump Circuit Wiring Diagram. Scheme 249

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.

Scheme 250

Scheme 251

1. No Fuel Pressure: Electrical Check. Install fuel pressure gauge. Cycle key from off to on several times to check if fuel pump runs. DO NOT crank engine. Pump should operate briefly each time key is on. If pump runs as indicated, service or replace fuel pump as necessary. If pump does not run as indicated, go to next step.
2. Checking For VPWR to ECA. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Install breakout box and connect ECA to it. With KOEO, DVOM on 20-volt scale, measure voltage between test pins No. 37 and 40 at breakout box, and between test pins No. 57 and 60 at breakout box. If either reading is less than 10.5 volts, go to «TEST A2 - VEHICLE BATTERY»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a2-vehicle-battery), step 1). If both readings are 10.5 volts or more, go to step 5).
3. Does not apply to trucks. (Scheme 250): Fuel Pump Relay Terminal Identification
4. Does not apply to trucks.
5. Check Voltage to Power-to-Pump Circuit. With KOEO, breakout box installed and ECA connected to it. Disconnect fuel pump circuit fuse (fuse No. 20). Reconnect fuel pump relay. Set DVOM on 20 volt scale. Measure voltage between chassis ground and power-to-pump circuit at fuel pump relay while cranking engine. If reading is less than 8 volts, go to next step. If reading is 8 volts or more, check the following: open in power-to-pump circuit, open in fuel pump and open in fuel pump ground circuit.
6. Checking BATT+ Circuit to Fuel Pump Relay. Turn key on, leaving engine off. Leave breakout box installed and ECA connected, locate fuel pump relay. Set DVOM on 20-volt scale. Measure voltage between chassis ground and BATT+ circuit at fuel pump relay. If reading is less than 10.5 volts, repair open in BATT+ circuit between fuel pump relay and battery positive post. Repeat QUICK TEST. If reading is 10.5 volts or greater, go to step 11).
7. Service Code 87: Checking VPWR Circuit to Fuel Pump Relay. Code 87 indicates a fuel pump primary circuit failure. Possible causes are: inertia switch not reset or electrically open, faulty fuel pump relay, ECA or open or shorted circuit. Turn key on, leaving engine off. Leave breakout box installed and ECA connected. Locate fuel pump relay. Set DVOM on 20-volt scale. Measure voltage between chassis ground and VPWR circuit at fuel pump relay. If reading is 10.5 volts or more, go to next step. If reading is less than 10.5 volts, ensure inertia switch is on. If inertia switch will not reset, replace switch. If switch is okay, repair open in VPWR circuit between EEC power relay and fuel pump relay. Repeat QUICK TEST.
8. Checking Fuel Pump Circuit Continuity. Turn key off and wait 10 seconds. Leave breakout box installed and ECA connected. With DVOM on 200-ohm scale, measure resistance between fuel pump circuit at pump relay and test pin No. 22 at breakout box. If reading is 5 ohms or more, repair open in fuel pump circuit. Repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
9. Checking For Short to Power. Disconnect ECA and fuel pump relay. With key on, breakout box installed, set DVOM on 20-volt scale. Measure voltage between test pin No. 22 and battery negative terminal. If voltage is less than one volt, go to next step. If voltage is more than one volt, repair short circuit. Reconnect ECA and attempt to start vehicle. If vehicle fails to start, replace ECA. Rerun QUICK TEST.
10. Checking For Short to Ground. Turn key off. Leave breakout box installed and disconnect ECA. Disconnect fuel pump relay. With DVOM on 200K-ohm scale, measure resistance between test pin No. 22 and test pins No. 40 and 60 at breakout box. If reading is less than 10K ohms, repair short in fuel pump circuit. Repeat QUICK TEST. If reading is 10K ohms or more, go to next step.
11. Checking Voltage at Power-to-Pump Circuit. Leave breakout box installed and ECA disconnected. Install a jumper wire between test pin No. 22 and test pins No. 40 or 60 at breakout box. Set DVOM on 20 volt scale. With KOEO, measure voltage between chassis ground and power-to-pump circuit at fuel pump relay. If reading is 10.5 volts or more, replace ECA and repeat QUICK TEST. If reading is less than 10.5 volts, replace fuel pump relay. Connect ECA and repeat QUICK TEST.
12. Service Code 95: Check Inertia Switch. A KOEO code 95 indicates that one of the following has occurred: Inertia switch not reset or electrically open. Open circuit in or between ECA and fuel pump. Faulty ground connection at fuel pump. Fuel pump secondary circuit shorted to power. Fuel pump relay contacts always closed. Faulty ECA. Turn key off and wait 10 seconds. Locate and disconnect inertia switch. Set DVOM on 200-ohm scale. Measure resistance of inertia switch. If resistance is less than 5 ohms, reconnect inertia switch and go to next step. If resistance is more than 5 ohms, replace or reset inertia switch and rerun QUICK TEST.
13. Verifying Fuel Pump is Off. With key off, listen for fuel pump noise. If fuel pump is off, go to step 15). If fuel pump is on, go to next step.
14. Fuel Pump Relay Check. Turn key off. Remove fuel pump relay. If fuel pump turns off, replace fuel pump relay. Repeat QUICK TEST. If fuel pump does not turn off, repair short to power-to-pump circuit. Repeat QUICK TEST.
15. Checking Continuity of Fuel Pump Monitor (FPM) Circuit. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Install breakout box and leave ECA disconnected. Disconnect fuel pump relay. Set DVOM on 200-ohm scale and measure resistance between test pin No. 8 at the breakout box and power-to-pump circuit at the fuel pump relay harness. (Scheme 251) If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair open circuit and rerun QUICK TEST. (Scheme 251): Fuel Pump Relay Vehicle Harness Connector
16. Checking Continuity Between FPM Circuit and Ground. Turn key off. Install breakout box and disconnect ECA. Disconnect fuel pump relay. Set DVOM on 200-ohm scale and measure resistance between test pin No. 8 at the breakout box and battery negative terminal. If resistance is less than 10 ohms, remove test set-up, reconnect fuel pump relay, replace ECA and rerun QUICK TEST. If resistance is more than 10 ohms, remove test set-up and check the following: open circuit in fuel pump, poor ground connection at fuel pump, or an open in power-to-pump circuit.
17. Checking Fuel Pump Primary Circuit For Short to Ground. Turn key off and wait 10 seconds. Install breakout box and disconnect ECA. Disconnect fuel pump relay and set DVOM on 200K-ohm scale. Measure resistance between test pins No. 22 and 40 at the breakout box. If resistance is greater than 10K ohms, remove test set-up. Replace ECA, and rerun QUICK TEST. If resistance is less than 10K ohms, remove test set-up. Repair short circuit and rerun QUICK TEST.
18. Service Code 96: Checking BATT+ to Fuel Pump Relay. Service code 96 indicates a fuel pump secondary circuit failure between the BATT+ supply and the FPM connection to the POWER-to-PUMP connection. Possible causes are: faulty fuel pump relay or ECA, open circuit. Turn key off and wait 10 seconds. Locate fuel pump relay. With the DVOM on 20-volt scale, measure voltage between BATT+ circuit at fuel pump relay and battery negative. If voltage is greater than 10.5 volts, go to next step. If voltage is less than 10.5 volts, repair open circuit and rerun QUICK TEST.
19. Verifying Fuel Pump Operation. With key off, set DVOM on 20-volt scale. Connect DVOM between POWER-to-PUMP circuit at fuel pump relay and battery negative post. Check voltage while turning key to RUN position (one second) and OFF position (10 seconds). Repeat cycle at least 5 times. If voltage is greater than 10.5 volts for approximately one second after key is turned to RUN position, go to next step. If voltage is not to specification, inspect relay harness connector and if okay, replace fuel pump relay.
20. Checking Continuity of Power-to-Pump Circuit. Turn key off and disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Install breakout box and leave ECA disconnected. With DVOM on 200-ohm scale, measure resistance between test pin No. 8 at breakout box and POWER-to-PUMP circuit at relay harness connector. If resistance is less than 5 ohms, remove test set up, replace ECA, and rerun QUICK TEST. If resistance is more than 5 ohms, repair open circuit between FPM connecting splice and relay. Rerun QUICK TEST.
21. Continuous Memory Code 95: Checking EEC-IV Harness. A continuous code 95 indicates that one of the following conditions has occurred intermittently: Open circuit in or between the fuel pump and FPM circuit at the ECA. Faulty ground circuit at the fuel pump. Start engine and perform WIGGLE TEST on harness assembly to fuel pump, and to pump ground circuit harness. Lightly tap inertia switch and pump to simulate road shock. Check for engine miss or stumble while performing test. With key off, check harness connectors for corrosion or damage. Isolate and repair any faults that are found, clear Code 95 and rerun QUICK TEST. If no fault is found, go to next step.
22. Checking FPM Circuit. Turn key off. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Install breakout box and leave ECA disconnected. With KOEO, connect a test light between test pin No. 8 and test pin No. 37. With test light lit, perform WIGGLE test on FPM circuit between pump and monitor. Light should go out if fault is found during WIGGLE TEST. Isolate and repair any found faults, remove test set-up and rerun QUICK TEST. If no faults are found, go to next step.
23. Check For Short to Power. With KOEO, breakout box installed and ECA disconnected. Connect a test light between test pin No. 8 and test pin No. 40. Observe test light, perform WIGGLE test on FPM circuit and POWER-to-PUMP circuit. Lightly tap the fuel pump relay to simulate road shock. Light should go on when fault is found during WIGGLE TEST, indicating a short to power. Listen for sound of fuel pump turning on. Isolate and repair any found faults, remove test set up and rerun QUICK TEST. If no faults are found, fault is intermittent and cannot be duplicated at this time.
24. Continuous Code 96: Check For Code 87. If Code 87 is also present with Code 96, go to step 26). If code 87 is not displayed, go to next step.
25. Checking EEC-IV Harness. A continuous code 96 without an accompanying code 87 indicates one of the following occurred during vehicle operation: An open in the BATT+ circuit between the BATT+ and the fuel pump relay, relay contacts opened or open in the POWER-to-PUMP circuit from the fuel pump relay to the FPM splice. With engine running attempt to cause a miss or stumble while performing WIGGLE TEST on pump harness and connectors. With engine off, inspect all connectors for damage or corrosion. If a fault is found, isolate and repair it. Clear codes and rerun QUICK TEST. If no fault is found, fault may not be duplicated at this time. Clear memory codes, code 96 testing is complete.
26. Continuous Memory Code 87: Checking EEC-IV Harness. A continuous Code 87 indicates the primary fuel pump circuit has failed during vehicle operation. Possible causes for this fault are; An open in the VPWR circuit between the EEC power relay and the fuel pump relay, open coil in fuel pump relay or open in fuel pump circuit. Faulty inertia switch. With engine running, attempt to cause a miss or stumble while performing WIGGLE TEST on VPWR circuit between EEC power relay and fuel pump relay. Wiggle fuel pump circuit harness (test pin No. 22) between ECA and the fuel pump relay. Lightly tap fuel pump relay to simulate road shock. With key off, inspect ECA 60-pin connector for damage or corrosion. If a fault is found, isolate and repair it. Rerun QUICK TEST. If no fault is found, fault may not be duplicated at this time.

TEST D1 - EGR ON/OFF

Note. Perform this test when Service Code 34 is displayed during QUICK TESTS or when directed here by other test procedures. 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.

EGR On/Off Circuit. Scheme 252

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 valve.

1. Service Code 34: Enter Output State Check. KOER Code 34 indicates that with engine RPM above idle and stable, a specified RPM drop did not occur when EGR was cycled. Possible causes are: Faulty EGR On/Off control solenoid, Faulty EGR solenoid, Faulty EGR vent solenoid, Faulty EVP sensor, Faulty wiring harness, Faulty ECA, Manifold vacuum line blocked or leaking. Use only VOM/DVOM, not diagnostic 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. Jumper STI to SIGNAL RETURN at SELF-TEST connector. Rerun KOEO SELF-TEST until end of CONTINUOUS SELF-TEST code display (DVOM will read zero volts). Depress and release throttle and observe DVOM reading. If DVOM reading changes to a higher voltage, stay in OUTPUT STATE CHECK and go to next step. If DVOM did not show high voltage, depress throttle to WOT and release. If STO voltage does not go high, go to «TEST D16 - OUTPUT STATE»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d16-output-state) , step 1). Leave test equipment hooked up.
2. Checking Solenoid Electrical Operation. 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 STI jumper wire and go to step 5). If output cycles on and off, go to next step.
3. Checking Solenoid For Vacuum Cycling. 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. If vacuum output cycles, go to next step.
4. Checking Manifold Vacuum Lines. With vacuum lines disconnected at EGR solenoid, start engine. If vacuum is present, EEC 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.
5. Measuring Solenoid Resistance. 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 EGR solenoid and repeat QUICK TEST. If reading is between 65 and 110 ohms, go to next step.
6. Checking VPWR Circuit. With KOEO, set DVOM on 20-volt scale. Measure voltage between VPWR circuit at EGR solenoid harness connector and battery ground. If reading is less than 10.5 volts, repair open in harness and repeat QUICK TEST. If reading is 10.5 volts or more, go to next step.
7. Checking Continuity of EGR Circuit. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 35 at the breakout box and EGR circuit at harness connector. If reading is 5 ohms or more, repair open circuit and repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
8. Checking Circuit For Short to Ground. Turn key off and wait 10 seconds. Leave breakout box installed and ECA disconnected. Disconnect EGR solenoid. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 35 and test pins No. 40, 46, and 60 at breakout box. If any reading is less than 10K ohms, repair short to ground and repeat QUICK TEST. If all readings are 10K ohms or more, go to next step.
9. Checking For Short to Power Circuit. Turn key off and wait 10 seconds. Leave breakout box installed. Disconnect ECA and EGR solenoid. With DVOM on 200K-ohm scale, measure resistance between test pin No. 35 and test pins No. 37 and 57. If any reading is less than 10K ohms, repair short to power and repeat QUICK TEST. If code is still repeated, replace ECA. If all readings are 10K ohms or more, replace ECA and repeat QUICK TEST.

TEST D3 - AIR SYSTEM

Note. Perform this test when Service Codes 44, 45, 46, 81, 82 or 94 is displayed during QUICK TESTS or when directed here by other test procedures.

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.

Air Management Circuits. Scheme 253

1. Service Codes 44 (94), 45 & 46: Verify Vacuum Line Routing. Code 44 (94) indicates thermactor system is inoperative. Code 45 indicates thermactor air not flowing upstream when signaled to do so by ECA. Code 46 indicates thermactor air not by-passed when directed. Possible causes for these faults are: vacuum hoses leaking, blocked or kinked, diverter valve or thermactor pump inoperative or AM solenoid defective or blocked. Check for correct vacuum hose routing to AM1/AM2 solenoids and by-pass diverter valve. Use vehicle emissions label as a guide. Check for kinked or blocked vacuum hoses. Check for kinked or blocked air hoses. Check for disconnected vacuum hoses. If problems are detected, correct hose routing, repair faults and repeat QUICK TEST. If vacuum routing is okay, and Code 44 (94) is displayed, go to step 4). If Code 46 is displayed, go to step 3). If Code 45 is displayed, go to next step.
2. Eliminating Displayed Code 45 (AM2). This step checks AM2 solenoid only. Disconnect and plug vacuum hose at diverter valve. Turn key off and wait 10 seconds. Repeat KOER SELF-TEST and record codes. If Code 45 is displayed, EEC system is okay. Check diverter valve and/or check valve for problem. If Code 45 is not displayed, go to step 4).
3. Eliminating Displayed Code 46 (AM1). This step checks AM1 solenoid only. Disconnect and plug vacuum hose at by-pass valve. Turn key off and wait 10 seconds. Repeat KOER SELF-TEST and record codes. If Code 46 is displayed, EEC system is okay. Check by-pass valve for problem. If Code 46 is not displayed, go to next step.
4. Output Check. Enter OUTPUT STATE CHECK, see OUTPUT STATE CHECK, under DIAGNOSTIC AIDS. Use only DVOM, not diagnostic tester, for this step. Turn key off and wait 10 seconds. With DVOM on 20-volt scale, connect DVOM negative test lead to STO circuit at SELF-TEST connector and positive test lead to battery positive terminal. Using jumper wire, connect STI to SIG RTN at SELF-TEST connector. Perform KOEO SELF-TEST until end of CONTINUOUS SELF-TEST codes (DVOM reads zero volts). Depress and release throttle. DVOM should change to a high voltage reading. If reading changed, remain in OUTPUT STATE CHECK and go to next step. If reading did not change, depress throttle to WOT and release. If STO voltage does not go high, go to «TEST D16 - OUTPUT STATE»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d16-output-state), step 1). Leave test equipment hooked up.
5. Checking AM1/AM2 Solenoid Operation. Set DVOM on 20-volt scale. Connect DVOM positive test lead to VPWR circuit and negative test lead to AM1 circuit at AM1 solenoid harness connector. (Scheme 253) While observing DVOM, depress and release throttle several times to cycle output on and off. Repeat for AM2 solenoid. Connect positive test lead to VPWR circuit and negative test lead to AM2 circuit at AM2 solenoid harness connector. Cycle AM2 solenoid on and off. If either solenoid does not cycle on and off, remove jumper and go to step 9). If both solenoids cycle on and off, go to next step.
6. Checking AM1/AM2 Solenoids For Vacuum Cycling. Connect vacuum pump to AM1 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 AM2 solenoid. If either output does not cycle on and off, replace solenoid assembly and repeat QUICK TEST. If both outputs cycle on and off, go to next step.
7. Checking Manifold Vacuum Lines. With vacuum hoses disconnected at AM1/AM2 solenoid assembly, start engine and check for vacuum. If vacuum is present, EEC system is okay. Check thermactor valve and air pump for problems. If no vacuum is present, repair blockage as required and repeat QUICK TEST.
8. Service Codes 81 and 82: Checking Voltage to VPWR Circuit. Code 81 and 82 indicates voltage output for thermactor air solenoid did not change when activated. Possible causes are: shorted or open circuits, solenoid resistance out of range or faulty ECA. Turn key on, leaving engine off. Set DVOM on 20-volt scale. Measure voltage between AM1 solenoid VPWR circuit and battery ground. Repeat test for AM2 solenoid. If either voltage reading is less than 10.5 volts, repair harness circuit open and repeat QUICK TEST. If both readings are greater than 10.5 volts, go to next step.
9. Measuring Solenoid Resistance. Turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Disconnect AM1 and AM2 solenoid connectors. Measure resistance of both solenoids. If either reading is less than 50 ohms or more 100 ohms, replace solenoid assembly and repeat QUICK TEST. If both readings are between 50 and 100 ohms, connect TAB and TAD solenoids. Go to next step.
10. Checking Circuit Continuity. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires and repair as necessary. Install breakout box, leaving ECA disconnected. With DVOM on 200-ohm scale, measure resistance between test pin No. 51 and AM1 circuit at harness connector. (Scheme 253) Measure resistance between test pin No. 11 and AM2 circuit at harness connector. If either reading is 5 ohms or more, repair harness open circuit and repeat QUICK TEST. If both readings are less than 5 ohms, go to next step.
11. Checking For Shorts to Ground. Turn key off and wait 10 seconds. Set DVOM on 200K-scale. Leave breakout box installed and ECA disconnected. Disconnect AM1/AM2 solenoids. Measure resistance between test pin No. 51 and test pins No. 40, 46 and 60, and between test pin No. 11 and test pins No. 40, 46 and 60 at breakout box. If any reading is less than 10K ohms, repair short to power. Remove breakout box, connect harness to ECA and repeat QUICK TEST. If all readings are 10K ohms or more, go to next step.
12. Checking For Shorts to Power Circuit. Turn key off and wait 10 seconds. Set DVOM on 200K-ohm scale. Leave breakout box installed with ECA and solenoids disconnected. Measure resistance between test pin No. 51 and test pins No. 37 and 57 and between test pin No. 11 and test pins No. 37 and 57. If any reading is less than 10K ohms, repair short to power. Remove breakout box, connect harness to ECA and repeat QUICK TEST. If code is repeated, replace ECA. If all readings are 10K ohms or more, replace ECA and repeat QUICK TEST.

TEST D4 - CANISTER PURGE

Note. Perform this test when Service Code 85 is displayed during QUICK TESTS or when directed here by other test procedures.

Canister Purge (CANP) Circuit. Scheme 254

1. Checking System Function. Enter OUTPUT STATE CHECK. See OUTPUT STATE CHECK, under DIAGNOSTIC AIDS in QUICK TEST. Use only DVOM, not diagnostic tester, for this step. Turn key off and wait 10 seconds. Set DVOM on 20-volt scale. Connect DVOM negative test lead to STO and positive test lead to positive battery terminal. Using jumper wire, connect STI circuit to SIGNAL RETURN at SELF-TEST connector. Perform KOEO SELF-TEST until end of Continuous Memory 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 D16 - OUTPUT STATE»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d16-output-state) , step 1). Leave test equipment hooked up. If reading changed, remain in OUTPUT STATE CHECK and go to next step.
2. Checking Solenoid Electrical Function. With KOEO, set DVOM on 20-volt scale. Disconnect CANP solenoid. Connect DVOM positive test lead to VPWR circuit and negative test lead to CANP output circuit on harness connector. While observing DVOM, depress and release throttle several times to cycle output on and off. If CANP circuit does not cycle on and off, remove jumper wire and go to step 6). If CANP circuit cycles, go to next step.
3. Checking Solenoid For Vacuum Leaks. Turn key on. Leave CANP solenoid disconnected. Disconnect vacuum hose at canister purge solenoid from manifold vacuum side of engine. Apply 16 in. Hg vacuum to manifold vacuum side of CANP solenoid. If CANP solenoid does not hold vacuum for 20 seconds, replace it and repeat QUICK TEST. If fault is still present, service fuel evaporation canister. If CANP holds vacuum for 20 seconds, leave vacuum pump attached and go to next step.
4. Checking Solenoid Mechanical Operation. While still in OUTPUT STATE CHECK, cycle CANP circuit off (no voltage). Reconnect CANP solenoid connector. Apply 16 in. Hg vacuum to CANP solenoid as in step 3). Depress and release throttle. If vacuum is released, check hose from solenoid to canister for leaks or cracks, if okay, remove jumper wire from STI and go to next step. If vacuum is not released, replace CANP solenoid and repeat QUICK TEST.
5. Checking Vacuum Supply. Disconnect vacuum hose from canister purge solenoid on manifold vacuum (PVC) side. Start engine. If vacuum is present at vacuum hose, EEC system is okay. Check evaporative canister. If vacuum is not present at hose, check vacuum hose for proper routing, kinks, or blockage, If okay, check engine for cause of low vacuum.
6. Measuring CANP Solenoid Resistance. Code 85 indicates a fault in the CANP solenoid circuit. Turn key off and wait 10 seconds. Set DVOM on 200-ohm scale. Disconnect CANP solenoid connector and measure solenoid resistance. If reading is between 40-90 ohms, go to next step. If reading is incorrect, replace CANP solenoid and repeat QUICK TEST.
7. Checking Voltage of VPWR Circuit. With KOEO, and CANP solenoid disconnected, set DVOM on 20-volt scale. Measure voltage between VPWR circuit at CANP solenoid harness connector and battery negative terminal. If reading is 10.5 volts or greater, go to next step. If reading is less than 10.5 volts, repair open in circuit and repeat QUICK TEST.
8. Checking Continuity of CANP Circuit. Turn key off and wait 10 seconds. Disconnect CANP solenoid and ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Connect breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 31 and CANP harness connector. If reading is less than 5 ohms, go to next step. If reading is 5 ohms or more, repair open circuit and repeat QUICK TEST.
9. Checking For Short to Ground. Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale and disconnect CANP solenoid. Measure resistance between test pin No. 31 and test pins No. 40, 46, and 60 at breakout box. If all readings are 10K ohms or more, go to next step. If any reading is less than 10K ohms, repair short to ground and repeat QUICK TEST.
10. Checking For Short to Power. Turn key off and wait 10 seconds. Disconnect CANP solenoid. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale and disconnect CANP solenoid. Measure resistance between test pin No. 31 and test pins No. 37 and 57 at breakout box. If all reading are 10K ohms or more, remove breakout box. Replace ECA and repeat QUICK TEST. If any reading is less than 10K ohms, repair short to power and repeat QUICK TEST. If code is repeated, replace ECA and repeat QUICK TEST.
11. Check If CANP Caused Codes 16 or 26. With key off, disconnect vacuum hose at canister purge solenoid on canister side. Start engine and allow to idle. If vacuum is present on canister side of canister purge solenoid, go to step 1), in this test. If vacuum is not present, and a Code 26 is displayed, check for vacuum leaks or lack of vacuum. If Code 16 is present, check for vacuum leaks at injector "O" rings, vacuum lines and fittings, or between air meter and throttle body. Service as necessary and rerun QUICK TEST.

TEST D5 - ISC

Note. Perform this test when Service Code 12, 13, 16, 17, 19, 47 or 48 displayed during QUICK TESTS or when directed here by other test procedures. If engine is running rough or has rough idle, correct these conditions before performing test. Causes may be in ignition system, fuel system or EGR system.

Idle Speed Control (Air By-Pass) Circuit. Scheme 255

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

Scheme 256

1. Service Code 12: Check For RPM Drop. Code 12 indicates that during KOER Self-Test engine RPM could not be controlled within Self-Test minimum RPM. Possible causes are: Open or shorted circuit, Sticking or binding throttle linkage, Incorrect idle adjustment, Throttle body or ISC solenoid contamination, Faulty ISC solenoid, Faulty ECA, Non-ECC mechanical faults. 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. Checking For EGR Codes. If EGR service codes 31, 32, 33 or 34 are displayed, reconnect ISC solenoid and go to ENGINE RUNNING SELF-TEST table and perform appropriate CIRCUIT TEST. If these codes are not displayed, go to next step.
3. Checking For Other Codes. If Codes 22, 41, 42, 91, or 92 are displayed, reconnect ISC solenoid, go to ENGINE RUNNING SELF-TEST table and perform appropriate CIRCUIT TEST. If these codes are not displayed, go to next step.
4. Measuring ISC Solenoid Resistance. Turn key off. Disconnect ISC solenoid. Set DVOM on 200-ohm scale, and measure resistance of ISC solenoid connector. (Scheme 256) If resistance is between 7 and 13 ohms, go to next step. If resistance is less than 7 ohms or more than 13 ohms, replace ISC solenoid and repeat QUICK TEST. (Scheme 256): ISC Solenoid Connector
5. Checking For Internal Short to ISC Solenoid Case. With key off and ISC solenoid disconnected, set DVOM on 200K-ohm scale. Measure resistance from either ISC terminal pin to ISC solenoid housing. If reading is greater than 10K ohms, go to next step. If reading is 10K ohms or less, replace ISC solenoid. Repeat QUICK TEST.
6. Checking VPWR Circuit. Leave ISC harness disconnected. With KOEO, set DVOM on 20-volt scale. Measure voltage between VPWR circuit at ISC harness connector and battery ground terminal. If reading is less than 10.5 volts, repair open in circuit and repeat QUICK TEST. If reading is 10.5 volts or more, go to next step.
7. Checking ISC Circuit Continuity. Turn key off and wait 10 seconds. Leave ISC solenoid disconnected. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Install breakout box, leaving ECA disconnected. With DVOM on 200-ohm scale, measure resistance between test pin No. 21 and ISC circuit at ISC harness connector. If reading is greater than 5 ohms, repair open circuit and repeat QUICK TEST. If reading is less than 5 ohms, go to next step.
8. Checking For Circuit Short to Ground. Turn key off and wait 10 seconds. Leave ISC solenoid disconnected. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 21 and test pins No. 40, 46, and 60 at breakout box. If any reading is less than 10K ohms, repair short to ground and repeat QUICK TEST. If all readings are 10K ohms or more, go to next step.
9. Checking For Short to Power. Turn key off and wait 10 seconds. Leave breakout box installed. Leave ECA and ISC solenoid disconnected. Set DVOM on 200K-ohm scale. Measure resistance by connecting DVOM negative lead to test pin No. 21 and positive lead to test pin No. 37. If reading is greater than 10K ohms, go to next step. If reading is 10K ohms or less, repair short to power and repeat QUICK TEST. If code or symptom is still present, replace ECA.
10. Checking ISC Signal From ECA. With key off, connect ECA and ISC. Leave breakout box installed and set DVOM on 20-volt scale. Connect DVOM between test pins No. 21 and 40. Start engine and observe DVOM while slowly increasing and decreasing engine RPM. If DVOM reading varies, go to next step. If DVOM reading does not vary, replace ECA and repeat QUICK TEST.
11. Checking Base/Curb Idle. Verify base/curb idle speed. Remove ISC solenoid and inspect for contamination, service as necessary. Rerun QUICK TEST, if code or symptom is still present, replace ISC solenoid. If curb idle speed is incorrect, reset idle speed to specification. Rerun QUICK TEST. If unable to set idle to specification, go to next step.
12. Check Faults Which Affect Idle Speed. Check the following mechanical items for faults: Throttle linkage and/or cruise control linkage for sticking or binding. Throttle body for contamination. Vacuum hoses (check emission decal). Remove ISC solenoid and inspect for contamination. Service as necessary and rerun QUICK TEST. If code or symptom is still present, replace ISC. If any of the above items are faulty, service as necessary and rerun QUICK TEST.
13. Service Code 13: Verify Idle Speed is Within Specification. Service code 13 indicates that during KOER SELF-TEST, engine RPM could not be controlled within the SELF-TEST lower limit range. Possible causes are: Incorrect idle setting, Vacuum leaks, Sticking or binding throttle linkage, Throttle plates open, Incorrect ignition timing (TFI ignition only), Throttle body or ISC solenoid contamination, ISC circuit shorted to ground or faulty ISC solenoid. If all of the above components are okay, and idle is set to specification, remove ISC solenoid and inspect for contamination. Service as necessary and rerun QUICK TEST. If code or symptom is still present, replace ISC solenoid. If idle speed is not set to specification, reset and rerun QUICK TEST. If idle speed cannot be reset to specification, go to step 6) of this test.
14. Check For Conditions Affecting Idle Speed. Check the following mechanical components for faults: Engine vacuum hoses (refer to emission decal). Throttle linkage and/or cruise control linkage for sticking or binding. Check throttle plates are fully closed. Check for vacuum leaks in induction system. Check throttle body for contamination. Ensure base ignition timing is to specification on emission decal (TFI vehicles only). If all above checks are okay, go to next step. If a fault has been found, service as necessary and rerun QUICK-TEST.
15. Checking For Internal Short to ISC Solenoid Case. With key off and ISC solenoid disconnected, set DVOM on 200K-ohm scale. Measure resistance from either ISC terminal pin to ISC solenoid housing. If reading is greater than 10K ohms, go to next step. If reading is 10K ohms or less, replace ISC solenoid. Repeat QUICK TEST.
16. Checking For Circuit Short to Ground. Turn key off and wait 10 seconds. Leave ISC solenoid disconnected. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 21 and test pins No. 40, 46, and 60 at breakout box. If any reading is less than 10K ohms, repair short to ground and repeat QUICK TEST. If all readings are 10K ohms or more, go to next step.
17. Checking ISC Signal From ECA. With key off, reconnect ISC. Leave breakout box installed and connect ECA to it. Set DVOM on 20-volt scale. Connect DVOM between test pins No. 21 and 40. Start engine and observe DVOM while slowly increasing and decreasing engine RPM. If DVOM voltage reading varies, remove ISC solenoid and inspect for contamination, service as necessary. Rerun QUICK TEST, if code or symptom is still present, replace ISC solenoid. If DVOM voltage does not vary, replace ECA and rerun QUICK TEST.
18. Service Code 47: Check For Low Flow of Unmetered Air. Code 47 indicates that measured airflow at base idle was lower than ECA specification. Possible causes are: air/vacuum leaks in fuel charging system or faulty or leaking purge solenoid and/or injector "O" rings. Service any faults as necessary and rerun QUICK TEST. If no faults are present, EEC-IV system is okay, service other codes as necessary.
19. Service Code 48: Check For High Flow of Unmetered Air. Code 48 indicates that measured airflow at base idle was higher than ECA specification. Possible causes for this fault are: air/vacuum leaks in fuel charging system or loss of ignition or fuel. Check for and repair holes, cracks, and/or bad connections at air cleaner outlet tube (between vane airflow meter and fuel charging assembly). Check for loss of ignition or injection on one or more cylinders. If any faults are found, service as necessary. Rerun QUICK TEST. If no faults are found, EEC-IV system is okay for metered air.
20. Service Code 16: High ISC RPM. Code 16 indicates that with ISC off, engine RPM was above Self-Test specification limit. Possible causes for this fault are: incorrect idle adjustment, faulty purge solenoid, air/vacuum leaks. If Code 48 is also present, reset throttle plate. Refer to Vehicle Emission Control Decal for curb idle set procedure. Rerun QUICK TEST. If Code 48 is still present, go to step 19) of this test. If Code 48 is not present, go to step 13) of this test.
21. Service Code 19: ISC RPM Low. Code 19 indicates that with ISC off, engine RPM dropped below Self-Test limit (about 600 RPM). Possible causes are: engine below normal operating temperature, throttle body/air inlet contamination or incorrect idle speed adjustment. Turn key off and wait 10 seconds. Deactivate SELF-TEST. Start and run engine at 2000 RPM for 2 minutes or until top radiator hose is hot and pressurized. Turn key off and wait 10 seconds. Rerun KOER SELF-TEST. If engine stumbles and/or Code 19 is still displayed, inspect throttle body and air inlet for contamination, service as necessary and adjust curb idle. Rerun QUICK TEST. If Code 19 has been cleared, service other codes as necessary.
22. Service Code 17: ISC RPM Low. Code 17 indicates that with the ISC off, engine RPM was below Self-Test limit. Possible causes for this fault are: excessive engine accessory load, engine temperature below normal operating temperature, throttle body/air inlet contamination or incorrect idle adjustment. Check and correct excessive engine load conditions, cooling fans, lights, etc. Run engine at 2000 RPM for 2 minutes. Turn key off and wait 10 seconds. Rerun KOER SELF-TEST. If Code 17 is displayed, inspect throttle body and air inlet for contamination and clean as necessary. If okay, adjust base/curb idle speed and repeat QUICK TEST. If Code 17 is not displayed, service other codes as necessary.

Shift Indicator Light (SIL) Circuits. Scheme 257

1. Checking SIL Operation. Inspect SIL while driving vehicle. SIL should turn on when optimum shift RPM is reached in each gear. Light should be off in highest gear. If SIL light is always on, check for a short in SIL circuit. If light is always off, check for an open in SIL circuit. If light is always on, go to step 6). If light is always off, go to next step.
2. Check SIL Circuit Fuse. Turn key off and wait 10 seconds. Remove and inspect SIL fuse (No. 18). If fuse is okay, reconnect and go to next step. If fuse is blown, repair short to ground between fuse and SIL bulb. Replace fuse and check SIL operation.
3. Check SIL Bulb. With key off, remove and inspect SIL bulb. If bulb is okay, go to next step. If bulb has failed, replace and check SIL operation.
4. Check Continuity of SIL Dimmer Relay. With key off, disconnect SIL dimmer relay. Set DVOM on 200-ohm scale. Measure resistance between pins No. 3 and 5 on SIL dimmer relay. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, replace SIL dimmer relay and check operation.
5. Check SIL Dimmer Relay Function. With key off, disconnect SIL dimmer relay. Apply 12 volts across pins No. 1 and 2 of SIL dimmer relay. With DVOM on 200-ohm scale, measure resistance between pins No. 3 and 5 on SIL dimmer relay. If resistance is between 40 and 55 ohms, go to next step. If resistance is not 40-55 ohms, replace SIL dimmer relay and retest operation.
6. Check Voltage at SIL Dimmer Relay. With KOEO, disconnect SIL dimmer relay. Set DVOM on 20-volt scale. Measure voltage between test pin No. 5 of the SIL dimmer relay harness connector and the battery negative post. If voltage is greater than 5 volts, reconnect relay and go to next step. If voltage is less than 5 volts repair circuit between top gear switch and SIL dimmer relay. Recheck SIL operation.
7. Check Voltage at Top Gear Switch. With KOEO, disconnect top gear switch. Set DVOM on 20-volt scale. Measure voltage between the SIL dimmer relay side of the top gear switch harness connector and battery negative post. If voltage is greater than 5 volts, go to next step. If voltage is less than 5 volts, repair circuit between high gear switch and dimmer relay. Check SIL operation.
8. Checking Operation of Top Gear Switch. Turn key off and wait 10 seconds. Disconnect high gear switch. Set DVOM on 200-ohm scale. Measure resistance of top gear switch while shifting transmission from top gear to the next lower gear. If switch opens and closes, go to next step. If circuit does not open and close, replace switch and check operation.
9. Checking Continuity of SIL Circuit. Turn key off, and disconnect high gear switch. Install breakout box and leave ECA disconnected. Set DVOM on 200-ohm scale, and measure resistance between test pin No. 53 and the ECA side of the high gear switch. If resistance is less than 5 ohms, reconnect high gear switch, shift transmission into high gear and go to next step. If resistance is more than 5 ohms, repair circuit between high gear switch and ECA.
10. Checking SIL Circuit For Short to Ground. Turn key off, and place transmission in highest gear. Set DVOM on 200K-ohm scale, and install breakout box, leaving ECA disconnected. Measure resistance between test pin No. 53 and test pin No. 60. If resistance is less than 10K ohms, repair short between high gear switch and ECA. If resistance is greater than 10K ohms, replace ECA and rerun QUICK TEST.

TEST D10 - DYNAMIC RESPONSE

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: person testing EEC system did not perform brief Wide Open Throttle (WOT) after Dynamic Response code, mechanical engine problems, or engine did not go over 2000 RPM. This test is intended to diagnose the throttle movement (Minimum 3/4 throttle), Vane Airflow Meter (VAF) open at least 50% and RPM increase greater than 2000 RPM.

Note. If throttle is snapped open briefly it may not pass the WOT test. Ensure that the throttle is depressed fully to WOT and that engine exceeds 2000 RPM.

Code 77 Displayed: System Failed to Recognize WOT Test. Rerun KOER SELF TEST as follows

1. Start engine.
2. Activate KOER SELF-TEST.
3. Observe ID code 2 (0 with STAR tester).
4. Observe Dynamic Response Code 1 (0 with STAR tester).
5. Perform brief WOT.
6. Testing complete, service code output begins.

If Code 77 is still displayed, replace ECA and rerun QUICK TEST. If Code 77 is no longer present, vehicle has passed Dynamic Response test, service other codes as necessary.

TEST D11 - CHECK ENGINE

Note. To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: fuses, bulb, or socket. This circuit test checks STO-MIL circuit and ECA. You should perform this test when Codes 70, 71 or 72 is displayed, or when directed here by other test procedure.

"CHECK ENGINE" Light (Malfunction Indicator) Circuit. Scheme 258

Note. All service codes, except a Code 11 (pass), must be cleared before continuing.

1. "CHECK ENGINE" Light Always On: Checking For Short to Ground. If vehicle will not start, go to «TEST A1 - NO START»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a1-no-start) , step 1). Turn key off. Disconnect ECA 60-pin connector. Inspect connector and wires for damage, corrosion, or loose wires and repair as necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 200K-ohm scale. Connect DVOM between test pins No. 17 and No. 40 at the breakout box. If resistance is greater than 10K ohms, replace ECA. If reading is less than 10K ohms, repair short between test pin No. 17 and SELF-TEST connector or "CHECK ENGINE" light.
2. "CHECK ENGINE" Light Never On: Check Continuity of STO/MIL Circuit. If vehicle will not start, go to «TEST A1 - NO START»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a1-no-start) , step 1). Turn key off. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 17 and "CHECK ENGINE" light. If resistance is less than 5 ohms, go to next step. If not, repair open circuit in wiring harness and rerun QUICK TEST.
3. Checking For Power to "CHECK ENGINE" Light Bulb. If power exists at bulb, replace bulb or socket and go to next step. If no power exists at socket, check fuse and input circuit, and then go to next step.
4. Confirming Circuit Repair. Remove breakout box and reconnect ECA to harness. Turn key to "RUN" position. See if "CHECK ENGINE" light is on. If light is on, malfunction indicator system is okay. If light does not come on, replace ECA.
5. "CHECK ENGINE" Light Intermittently ON: Check For Short From STO to Ground. If vehicle does not start, go to «TEST A1 - NO START»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a1-no-start) , step 1). Service all Continuous Memory Codes before proceeding. If no codes are outputted, proceed with this test. Enter KOEO CONTINUOUS MONITOR MODE ("WIGGLE TEST"). Observe DVOM for indication of fault while performing "Wiggle" test on the harness in the following areas. From Self-Test connector to dash panel. Dash panel to ECA. Dash panel to "CHECK ENGINE" light. If a fault is indicated, repair as necessary and rerun QUICK TEST. If a fault is not indicated, fault cannot be duplicated at this time.
6. "CHECK ENGINE" Light Flashes With Erratic Idle: Check STI Short to Ground. Vehicle symptoms indicate STI is grounded and ECA is performing Self-Test without tester installed. With key off, disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Set DVOM on 200K-ohm scale. Measure resistance between STI connector and engine block ground. If resistance is less than 10K ohms, repair short circuit. Reconnect ECA and retest. If reconnect ECA and test for other rough idle symptoms.
7. "CHECK ENGINE" Message Displayed. If vehicle will not start, go to «TEST A1 - NO START»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a1-no-start) , step 1). Perform KOEO SELF-TEST, if the result is a pass code (11-10-11), repair fault in electronic message center Data Communications Link (DCL). If Pass Code is not displayed, service codes as described in Self-Test procedures.
8. Continuous Memory Code 70, 71 and 72: "CHECK ENGINE" Light On. Codes 70, 71 and 72 indicate a circuit failure has occurred on the Data Communications Link (DCL). These codes can occur alone or together. "CHECK ENGINE" message will be on. Code 70 indicates ECA is unable to transmit data. Code 71 indicates Cluster Control Assembly (CCA) is unable to transmit data. Code 72 indicates that Message Center Control Assembly (MCCA) is unable to transmit data. Perform KOEO SELF-TEST, if the result is a Pass Code (11-10-11), repair fault in electronic message center Data Communications Link (DCL). If pass code is not displayed, service codes as described in Self-Test procedures.

TEST D12 - IDM

Note. Perform this test when Service Code 14, 18, 19, 28, 45, 46, 48 or 88 is displayed during QUICK TESTS or when directed here by other test procedures.

7.5L TFI IDM Circuit. Scheme 259

To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault

1. TFI ignition module.
2. Ignition coil.
3. Spark plugs and/or high tension cables.
4. Distributor and PIP sensor.
5. Secondary ignition component arcing.

This test is intended to diagnose the following circuits and components: Harness circuits: IGNITION GROUND, SPOUT, PIP, IDM & DPI and ECA assembly.

On 7.5L trucks, Closed Bowl Distributor (CBD) is used. TFI module is located on the cowl, away from the distributor. The previous mounting window in the bowl of the distributor is closed. Two connectors are used, one connecting the harness to the vehicle Hall sensor, located in the distributor, and another connecting the harness to the TFI module.

1. Code 14: Erratic Ignition. Code 14 indicates two successive erratic Profile Ignition Pickup (PIP) pulses occurred, resulting in a possible engine miss or stall. Possible causes for this fault are: loose wires or connectors, arcing secondary ignition components or on-board transmitter equipment (2-way radio). If any of the above are present, service as necessary, clear code and rerun QUICK TEST. If the items listed are not present, go to step 3).
2. Check For Other Codes. If Codes 45, 46 or 48 are present, go to step 12). If Codes 45, 46 or 48 are not present, go to next step.
3. Continuous Memory Codes 14, 18, 28 or 48: Check IDM Circuit Continuity. Code 18 indicates a loss of IDM input signal. Possible causes: Open harness circuit Shorted harness Faulty TFI module Faulty ECA Code 28 indicates IDM input signal always low. Possible causes: Open or shorted harness Faulty CID sensor VBAT (battery voltage) low at DIS Faulty ECA Code 48 indicates IDM input signal always high. Possible causes: Open signal in harness VBAT open at secondary coil VBAT low at secondary coil NOTE: On TFI vehicles the IDM circuit has a 22K-ohm resistor between test pin No. 4 and the ignition coil negative terminal. Turn key off an wait 10 seconds. Disconnect E-core ignition coil. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Install breakout box, leave ECA connected and set DVOM on 200K-ohm scale. On TFI equipped vehicles, measure resistance between test pin No. 4 at the breakout box and negative terminal of ignition coil harness connector. If resistance is between 20K and 24K ohms, go to next step. If resistance is not to specification, repair open circuit, clear codes, retest and reconnect E-core coil.
4. Checking IDM Circuit For Short to Ground. Turn key off and wait 10 seconds. Disconnect E-core ignition coil on TFI vehicles. Install breakout box and ECA disconnected. With DVOM on 200K-ohm scale, measure resistance between test pin No. 4 and test pins No. 40, 46, and 60. If any reading is less than 10K ohms, repair short to ground in IDM circuit, reconnect all components and rerun QUICK TEST. If all readings are 10K ohms or more, reconnect components and go to next step.
5. Checking ECA For Short to Ground. Turn key off and wait 10 seconds. Disconnect E-core ignition coil. Install breakout box and connect ECA. With DVOM on 200K-ohm scale, measure resistance between test pin No. 4 and test pins No. 40, 46, and 60. If any reading is less than 10K ohms, replace ECA, reconnect all components and rerun QUICK TEST. If all readings are 10K ohms or more, reconnect components and go to next step.
6. Checking Ignition Module. Turn key off and wait 10 seconds. Deactivate SELF-TEST. Using CONTINUOUS MONITOR (WIGGLE) TEST, observe VOM or diagnostic tester for indication of fault while lightly tapping on TFI module to simulate road shock. Wiggle TFI harness connectors. On Closed Bowl Distributor (CBD) models, wiggle TFI and distributor hall connectors. If fault is indicated, disconnect and inspect TFI harness connectors and terminals for damage. If connector and terminals are okay, check TFI ignition system, if ignition is okay, replace ECA. If no fault is indicated, go to next step.
7. Checking EEC-IV Harness. While in CONTINUOUS MONITOR (WIGGLE) TEST, observe VOM or diagnostic tester 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. On CBD systems also test distributor Hall connector. Perform this test to check for faults in the following circuits: PIP Open/Shorted to Ground. Check circuit at test pin No. 56. SPOUT Shorted to Ground. Check circuit at test pin No. 36. Ignition Ground Open. Check circuit at test pin No. 16. IDM Open to Ground. Check circuit at test pin No. 4. IDM Shorted to Power. Check circuit at test pin No. 4. Perform CONTINUOUS MONITOR (WIGGLE) TEST on these circuits one at a time in order to isolate fault. If fault is indicated, isolate fault and repair harness. Repeat QUICK TEST. If no fault is indicated, go to next step.
8. Checking ECA and Harness Connectors. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion or loose wires. If connector is damaged, repair as necessary, clear codes and repeat QUICK TEST. If connector is okay, perform the following procedure based on the Continuous Memory Code displayed: Code 14: Unable to duplicate erratic ignition fault in EEC system. Remove breakout box, reconnect all components. Code 18: Replace ECA, remove breakout box and reconnect all components. Start and run engine for about one minute and rerun QUICK TEST. Codes 28 and 48: Remove breakout box and reconnect all components. Diagnose ignition system. If ignition system is okay, replace ECA.

TEST D13 - SPARK TIMING

Note. Perform this test when Service Code 18 or 49 is displayed during QUICK TESTS or when directed here by other test procedures.

Spark Timing Check Circuit. Scheme 260

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, and TFI ignition module. This test is intended to diagnose the SPOUT circuit in the harness, base timing and the ECA.

Scheme 261

1. KOER Code 18: Check Computed Spark Timing. On TFI vehicles, Code 18 indicates SPOUT circuit is open. Possible causes for this fault are: open harness circuit or faulty ECA or TFI module. Perform KOER SELF-TEST and verify that SELF-TEST is activated. Check and record timing while in KOER SELF-TEST. System locks timing for a period of 2 minutes after last service code is displayed. Computed timing during these 2 minutes is equal to base timing plus 20 degrees (+/- 3 degrees). If computed timing is correct, go to KOER SELF-TEST. If timing is not to specification, go to next step.
2. Checking Base Timing. Locate Spark Output (SPOUT) connector and open the connection. Start engine and check for 10 degrees BTDC base timing +/- 3 degrees. If base timing is correct, go to next step. If base timing is incorrect, on TFI equipped vehicles adjust base timing as necessary. After timing is reset, reconnect SPOUT and perform COMPUTED TIMING CHECK.
3. Checking For Power to ECA. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Install breakout box. With KOEO, and DVOM set on 20-volt scale, measure voltage between test pins No. 37 and 40, and between test pins No. 57 and 60 at the breakout box. If either reading is less than 10.5 volts, go to «TEST A2 - VEHICLE BATTERY»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a2-vehicle-battery), step 1). If both readings are 10.5 volts or more, go to next step.
4. Checking SPOUT Circuit For Continuity. Turn key off and wait 10 seconds. Install breakout box. Disconnect ECA and TFI module. With DVOM set on 200-ohm scale, measure resistance between test pin No. 36 (SPOUT) at breakout box and SPOUT pin 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. (Scheme 261): TFI Module Connector
5. Check SPOUT For Shorts. Turn key off and wait 10 seconds. Install breakout box and disconnect ECA. Set DVOM on 200K-ohms scale. Perform the following measurements: Short To Ground. Measure resistance between test pin No. 36 and test pins No. 16, 20, 40, 46 and 60. Short To Power. Measure resistance between test pin No. 36 and test pins No. 26,37 and 57. Short to PIP Circuit. Measure resistance between test pin No. 36 and test pin No. 56. If all resistances are greater than 10K ohms, go to next step. If resistances are not greater than 10K ohms, service short circuit. Remove breakout box, reconnect components and repeat QUICK TEST.
6. Checking ECA. Turn key off and wait 10 seconds. Install breakout box. Ensure ECA and TFI module are connected. Set breakout box timing switch to "DIST" position. Set DVOM on 20-volt scale. Measure voltage between test pin No. 36 at the breakout box and battery negative terminal during KOER SELF-TEST. If voltage is between 4 and 10 volts, EEC system is okay, remove breakout box and diagnose TFI ignition system. If voltage is not between 4 and 10 volts, remove breakout box, replace ECA and rerun QUICK TEST.
7. Continuous Memory Code 49: Check Harness Continuity. Code 49 indicates SPOUT signal has defaulted to 10 degrees BTDC. The SPOUT signal has a variable duty cycle with an amplitude of 4 volts to battery voltage (VBAT). If the SPOUT signal fails, the TFI module generates a fixed dwell and constant spark signal based on CID and PIP signals. This is the Failure Management Effects Mode (FMEM). Possible causes are: DIS module or faulty SPOUT signal circuit from ECA to DIS module. Turn key off and wait 10 seconds. Install breakout box and leave ECA disconnected. Disconnect DIS module. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 36 at the breakout box and pin No. 5 at the DIS module connector. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, ensure SPOUT connector is okay. If okay, repair open circuit, reconnect all components and rerun QUICK TEST.
8. Check Spout Circuit For Short to Power or Ground. Turn key off and wait 10 seconds. Install breakout box. Disconnect ECA and DIS module. Set DVOM on 200K-ohm scale. Measure resistance between test pin No. 36 at the breakout box and test pins No. 16, 40 and battery positive. If all resistances are greater than 10K ohms, diagnose TFI or DIS ignition system. If resistances are less than 10K ohms, service SPOUT circuit for shorts. Reconnect all components and rerun QUICK TEST.

TEST D14 - NO CODES

Note. Perform this CIRCUIT TEST when directed by other test procedures.

No Codes/Codes Not Listed Circuits. Scheme 262

1. Checking For VREF. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Install breakout box, and connect ECA. Set DVOM on 20-volt scale. With KOEO, measure voltage between test pin No. 26 and SIGNAL RETURN at Self-Test connector. If reading is less than 4 volts or more than 6 volts, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage) . VOLTAGE, step 1). If reading is between 4 and 6 volts, go to next step.
2. Checking SELF-TEST Input Continuity. Turn key off and wait 10 seconds. With breakout box installed and ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 48 at the breakout box and Self-Test Input (STI) at SELF-TEST connector pigtail. If reading is 5 ohms or more, repair open in circuit, remove breakout box and reconnect ECA. Rerun QUICK TEST. If reading is less than 5 ohms, go to next step.
3. Checking SELF-TEST Output Circuit Continuity. With breakout box installed and ECA disconnected, set DVOM on 200-ohm scale. Measure resistance between test pin No. 17 at the breakout box and Self-Test Output (STO) at SELF-TEST connector. If reading is 5 ohms or more, repair open circuit, remove breakout box and reconnect ECA. Rerun QUICK TEST. If reading is less than 5 ohms, go to next step.
4. Checking EGO Sensor Ground Continuity. Turn key off. With breakout box installed and DVOM on 200-ohm scale, measure resistance between test pin No. 49 and EGO GROUND on engine block. If reading is 5 ohms or more, repair EGO sensor ground wire or open circuit. If reading is less than 5 ohms, go to next step.
5. Checking For STO Short to Ground. With breakout box installed and ECA disconnected, set DVOM on 200K-ohm scale. Measure resistance between STO at Self-Test connector and engine block ground. Rerun QUICK TEST. If reading is 10K ohms or less, repair STO or MIL/SIL circuit for short to ground and repeat QUICK TEST. If reading is greater than 10K ohms, go to next step.
6. Intermittent: Neutral Drive Switch (NDS), No Codes Displayed. Turn key off. Install breakout box, and connect ECA to breakout box. Set DVOM on 20-volt scale. Connect DVOM between test pin No. 30 and test pins No. 40 or 60 at the breakout box. Refer to the circuit diagram in «TEST B13 - NDS & A/C»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-b13-nds-ac) for this step. Perform KOER SELF-TEST. If reading is greater than one volt, repair intermittent open in NDS harness connector or switch. If okay, reconnect ECA and go to KOER SELF-TEST for appropriate service codes. If reading is less than one volt, go to next step.
7. Power Relay Always On. Leave key off and breakout box installed. Set DVOM on 20-volt scale. Connect DVOM between test pins No. 37 or 57 and pins No. 40 or 60. Turn key on and then off. Wait 10 seconds. If reading does not change from 10.5 volts (or more) to zero volts, go to next step. If reading changes from 10.5 volts (or more) to zero volts, go to step 9) only if vehicle is equipped with Malfunction Indicator Light (MIL) or Shift Indicator Light (SIL). If vehicle is NOT equipped with either of these lights, replace ECA and repeat QUICK TEST. NOTE: Malfunction Indicator Light (MIL) is displayed as "CHECK ENGINE" light on instrument cluster.
8. VPWR Harness Short to Power. With key off, breakout box installed and EEC power relay or Integrated Relay Controller Module (IRCM) disconnected, set DVOM on 20-volt scale. Connect DVOM to test pin No. 37 or 57 and to test pin No. 40 or 46 at the breakout box. If voltage is greater than 10.5 volts, repair short to VPWR circuit and rerun QUICK TEST. If voltage is less than 10.5 volts, replace EEC-IV power relay or IRCM and rerun QUICK TEST.
9. Malfunction Indicator Light (MIL) or Shift Indicator Light (SIL). If shift indicator light is always on or off, go to CIRCUIT TEST D6, step 1). If malfunction indicator light is always on, go to CIRCUIT TEST D11, step 1). If malfunction indicator light is always off, go to CIRCUIT TEST D11, step 5). If MIL or SIL is working normally, replace ECA and repeat QUICK TEST.

TEST D15 - KOEO CODE 15

Note. Perform this CIRCUIT TEST when directed by other test procedures.

EEC Power Relay Circuit. Scheme 263

1. Continuous Memory Code 15 Displayed. Clear Continuous Memory Codes using procedure outlined in DIAGNOSIS & TESTING. Repeat KOEO SELF-TEST through Continuous Memory Code output. If continuous Code 15 is not displayed, continuous Code 15 testing is complete. If Continuous Memory Code 15 is displayed during retest, go to next step. NOTE: Continuous Memory Code 15 may be displayed when power to Keep Alive Memory (KAM) test pin No. 1 at ECA is interrupted. This code may be set when installing a breakout box. 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.
2. Engine Compartment Wire Routing. Ensure that EEC components and wiring are not close to high tension secondary voltage wires or ignition components. If EEC wiring is close to high tension wires, reroute EEC wiring. Repeat QUICK TEST. If Continuous Memory Code 15 is no longer displayed, Continuous Memory Code 15 testing is complete. If Continuous Memory Code 15 is still displayed, go to next step.
3. Checking Power Circuit For Keep Alive Memory (KAM). Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for damaged pins and loose wires. Service as necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 20-volt scale. Connect DVOM positive test lead to test pin No. 1 and negative test lead to pins No. 40 or 60 at the breakout box. Turn key on and observe voltage reading. If reading is less than 10.5 volts, repair open circuit. Repeat QUICK TEST. If reading is 10.5 volts or more, replace ECA and repeat QUICK TEST.

TEST D16 - OUTPUT STATE

Note. Perform this CIRCUIT TEST when directed by other test procedures.

Output State Check Circuit. Scheme 264

1. Checking Service Codes. Turn key off and wait 10 seconds. Perform KOEO SELF-TEST. If Codes 23, 53, 63 or 68 are displayed, go to KOEO SELF-TEST table and service code(s) as instructed. If no codes are displayed, go to «TEST D14 - NO CODES»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d14-no-codes) , step 1). If Code 11 (Pass) is displayed, go to next step.
2. Checking Throttle Linkage. Check throttle and linkage for sticking or binding. If throttle and linkage are okay, replace TPS and repeat QUICK TEST. If throttle and linkage are binding, repair as necessary and repeat QUICK TEST.

TEST D17 - RE-INITIALIZATION

Note. Perform this CIRCUIT TEST when Codes 71, 72 or 78 is displayed or when directed by other test procedures.

Note. The electrical signatures of some aftermarket components may affect driveability of the vehicle.

EEC Power Relay Circuit. Scheme 265

1. Codes 71, 72 or 78: Checking For Electrical Noise Sources. Continuous Memory Code 72 or 78 indicates that power to the ECA was interrupted sometime during the last 40 warm-up cycle. A Continuous Code 71 indicates that sometime during the past 40 warm-up cycles, the ECA software requested a re-initialization or review of previous drive sequence data. This process could result in a driveability complaint. Possible causes for this fault or complaint are: Vehicle power interrupted to ECA. Spark plug wires incorrectly routed too close to ignition. High tension wire shielding removed. Electrical, radio, or motor static noise. Test pin No. 20 (case ground) not grounded to chassis. Open diodes on A/C or ISC relay. Turn key off. Ensure that EEC wiring and components are more than 2" (50 mm) away from secondary ignition wires. Make sure that EEC wiring and components are more than 4" (100 mm) away from distributor, ignition coil, and starter motor and its wiring. If these items are correct, go to next step. If not, correct as necessary and repeat QUICK TEST.
2. Checking Harness and Case Ground. Turn key off. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, or loose wires. Repair if necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 20 and chassis ground. If reading is less than 5 ohms, go to next step. If not, repair wiring harness and repeat QUICK TEST.
3. Case Ground Check With Harness Disconnected. Turn key off. Connect ECA to breakout box, but disconnect harness from breakout box. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 20 and ECA metal case. If reading is less than 5 ohms, go to next step. If reading is more than 5 ohms, replace ECA and repeat QUICK TEST.
4. "WIGGLE" Testing VPWR Circuit. With KOEO, connect DVOM to SELF TEST connector. Deactivate SELF-TEST. Using Continuous Monitor Mode, perform "WIGGLE" test on EEC-IV harness from ECA to power relay. If a fault is indicated or a Code 71 is displayed, repair intermittent in VPWR circuit. If no fault is indicated, inspect harness connections and pins. Replace power relay and rerun QUICK TEST.
5. Code 19: Internal Voltage. Code 19 indicates the ECA voltage regulator does not have the ability to maintain correct internal voltage. Run KOEO SELF-TEST, if Code 19-10-11 is present, replace ECA and rerun test. If Code 19-10-11 is not present, service other codes as indicated.

TEST D19 - SYSTEM CHECK

Perform this test ONLY after Code 11 is displayed in KOEO SELF-TEST and you have been directed here from TEST A1 - NO START or by DIAGNOSIS BY SYMPTOM TEST.

System Check Diagram. Scheme 266

Scheme 267

1. ISC-BPA Check. This step is for MPFI and SEFI vehicles with Stall or No Start faults. If engine stalls or if it does not start, attempt to start engine at part throttle. If engine will start and run smoothly at part throttle, go to «TEST D5 - ISC»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d5-isc), step 4). If not, go to next step.
2. Check Power to MAP/BP Sensor. Use Ford Motor Co. MAP/BP tester for this test. Turn key off and disconnect MAP/BP sensor. Connect MAP/BP tester between harness and MAP/BP sensor. Connect banana plugs of tester into DVOM and set DVOM on 20-volt scale. With tester connected, turn key on. If Green light is on, go to next step. If light is not on, repair open in VREF circuit, remove MAP/BP tester. Reconnect components and retest symptom. (Scheme 267): MAP/BP Tester & Circuit
3. MAP/BP Tester Output Reading. Measure several "known good" MAP sensors to obtain average measured voltage for specific location and date of testing. With MAP sensor connected and key on, measure SIGNAL voltage at MAP sensor. If voltage is in the correct range for your altitude, go to next step. If voltage is not in the correct range for your altitude, replace MAP/BP sensor. MAP VOLTAGE OUTPUT Approx. 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
4. MAP/BP Engine Running Response Test. With key on, crank engine. If MAP/BP output voltage changes while cranking engine, go to step 6). If voltage does not change while cranking, go to next step.
5. Check Vacuum Lines. Check vacuum lines for correct routing, refer to Vehicle Emission Control Label. Check MAP sensor vacuum line for breaks, kinks or blockage. If vacuum lines are okay, replace MAP/BP sensor and retest. If vacuum lines are faulty, service as necessary and rerun QUICK TEST.
6. EGR Vacuum Check. Disconnect vacuum hose at EGR valve. DO NOT plug vacuum line. Start or attempt to start engine. If symptom is driveability related, check to see if vacuum is present at vacuum line. If vehicle is a "No Start", does engine start? If results are negative, go to next step. If results are positive, go to «TEST B11 - EVP»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-b11-evp-evr), EVR, step 42).
7. Checking EGR Valve. Inspect EGR valve for leaking. If valve is fully closed, go to «TEST C1 - FUEL CONTROL»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-c1-fuel-control), step 1). If EGR valve is leaking or not fully seated, replace or repair valve.

TEST D25 - E4OD TRANS

Note. You should perform this test when Codes 26, 47, 56, 66, 67, 91, 92, 93, 94, 97, 98 and 99 are displayed during KOEO SELF-TEST, Codes 26 and 65 are displayed during KOER SELF-TEST, or Codes 29, 49, 56, 59, 62, 66, 69 and 99 are displayed during CONTINUOUS MONITOR MODE testing or when directed here during DIAGNOSIS BY SYMPTOM tests. This circuit test is intended to diagnose only the following: harness circuits, CCC, CCS, 4X4 LOW, EPC, OCIL, OCS, SS1, SS2, SIGNRTN, TOT, MLP, VPWR and ECA. The Transmission Solenoid Assembly (7G391) and Manual Lever Position (MLP) sensor (7F293) are not diagnosed in this circuit test as they are not controlled by the ECA.

E4OD & MLP Harness Schematic. Scheme 268

4X4 Low & OD Cancel Harness Schematic. Scheme 269

E4OD Pinpoint Test Schematic. Scheme 270

Scheme 271

Scheme 272

Scheme 273

Scheme 274

1. Code 67: Check Resistance Through MLP Sensor. Code 67 indicates that total resistance in the MLP sensor is out of Self-Test range when the selector lever is in "P" (correct range is 3770-4607 ohms). Possible causes for this fault are: faulty MLP sensor, open or shorted harness, faulty ECA. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 10k-ohm scale. With KOEO, measure resistance between test pins No. 30 and 46 at the breakout box while moving the selector from "P" to "L" and back to "P". Record specifications and compare to specification table. If resistance is within specification, go to step 3). If not, go to next step. MLP RESISTANCE SPECIFICATIONS Gear Position Min. Ohms Max. Ohms "P" 3770 4607 "R" 1304 1593 "N" 660 807 "D" 361 442 "2" 190 232 "1" 78 95
2. Checking Continuity of MLP Harness. Ensure key is off and MLP sensor is disconnected from harness. Use a mirror to inspect ends of transmission harness connector at MLP sensor for damage or corrosion. Repair as necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 30 at the breakout box and corresponding pin at the MLP sensor vehicle harness connector. Measure resistance between test pin No. 46 at the breakout box and corresponding pin at the MLP sensor vehicle harness connector. If both resistances are less than 5 ohms, go to next step. If not, repair open circuit, remove breakout box, reconnect components and rerun QUICK TEST.
3. Check MLP Harness For Short To Power Or Ground. Turn key off. Ensure MLP sensor harness is disconnected. Install breakout box leaving ECA disconnected. Set DVOM on 200k-ohm scale. Measure resistance between test pin No. 30 and test pins No. 37 and 57 at the breakout box. Measure resistance between test pin No. 30 and test pins No. 40, 46 and 60 at the breakout box. Measure resistance between test pin No. 30 at the breakout box and chassis ground. If all resistances are greater than 10k ohms, go to next step. If not, repair short circuits, remove breakout box, reconnect components and rerun QUICK TEST.
4. Checking ECA Output Voltage. Ensure key is off. Disconnect MLP sensor from harness. Install breakout box and connect ECA. With KOEO, set DVOM on 20-volt scale. Measure voltage between test pins No. 30 and 46 at the breakout box. If voltage is 4.75-5.25 volts, service or adjust MLP sensor. If not, replace ECA, reconnect components and rerun QUICK TEST.
5. Code 47, 65 or 97: Verify Self-Test Mode. Code 47 indicates 4X4 LOW selector lever is not in 4X2 or 4X4 High position during KOEO Self-Test. This condition may be accompanied by an early shift in the 4X4 High range. Code 65 indicates that Overdrive Cancel Switch (OCS) is not cycled between the engine I.D. code and "Goose Test" in the KOER Self-Test. Code 97 indicates an Overdrive Cancel Light (OCL) fault during KOER Self-Test. Possible causes for this fault are: faulty 4X4 LOW switch, faulty OCS switch, burned out bulb, open harness, shorted harness or faulty ECA. Rerun QUICK TEST. If none of the above codes are present, fault cannot be duplicated at this time, testing is complete. If Code 97 is present, go to step 7). If any other codes are present, go to next step.
6. Cycle 4X4 LOW Or Overdrive Cancel Switch Circuit. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box, leaving ECA disconnected. With KOEO, set DVOM on 20-volt scale. For 4X4 LOW Circuit, measure voltage between test pin No. 12 and test pins No. 40 and 60 at the breakout box while cycling the Overdrive Cancel Switch (OCS). Move transfer case lever between 4X4 and 4X2 positions several times. For Overdrive Cancel Switch (OCS) Circuit, measure voltage between test pin No. 41 and test pins No. 40 and 60 at the breakout box while cycling the Overdrive Cancel Switch. Toggle the switch on the dash several times. If voltage cycles, remove breakout box. Replace ECA and rerun QUICK TEST. If voltage does not cycle, go to step 9) for driveability faults or next step for other faults.
7. Checking Circuits For Shorts To Ground. Ensure key is off, breakout box is installed and ECA is disconnected. Set DVOM on 200k ohm scale. For 4X4 LOW Circuit, disconnect 4X4 LOW switch. Measure resistance between test pin No. 12 and test pins No. 40 and 60 at the breakout box. For Overdrive Cancel Switch (OCS) Circuit, disconnect Overdrive Cancel Switch. Measure resistance between test pin No. 41 and test pins No. 40 and 60 at the breakout box. If resistance(s) is greater than 10k ohms, go to step 10) for Code 47 or 65. Go to next step for Code 97. If resistance is not greater than 10k ohms, for Code 47, repair short circuit and rerun KOEO Self-Test; for Code 65, repair short circuit and rerun KOER Self-Test, if Code 65 is still present, go to step 9). For Code 97, repair short circuit and rerun KOEO Self-Test.
8. Checking Key Power Through OCIL Circuit. With KOEO, ensure breakout box is installed and ECA is disconnected. Set DVOM on 20-volt scale. Measure voltage between test pin No. 32 and test pins No. 40 and 60 at the breakout box. If voltage is greater than 10.5 volts, remove breakout box, replace ECA and rerun QUICK TEST. If not, go to next step.
9. Checking Continuity Of LED Harness (4X4 LOW Or Overdrive Cancel). With KOEO, disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box, leaving ECA disconnected. Disconnect 4X4 LOW or Overdrive Cancel Switch. Set DVOM on 200-ohm scale. For 4X4 LOW Circuit, measure resistance between Key Power Circuit at the fuse panel (+ probe) and test pin No. 12 (- probe) at the breakout box. For OCS-OCIL Circuit, measure resistance between Key Power Circuit at the fuse panel (+ probe) and test pin No. 32 (- probe) at the breakout box. (Scheme 271): Fuse Panel If resistance is less than 5 ohms, go to next step. If not, check for a faulty indicator bulb (4X4 LOW LED or OCIL) or defective fuse in fuse panel. If fuse is okay, repair open circuit, remove breakout box and reconnect ECA. Rerun QUICK TEST.
10. Checking Continuity Of The 4X4 LOW Or Overdrive Cancel Switch Harness. With key off, breakout box installed and ECA disconnected, disconnect appropriate switch. Set DVOM on 200 ohm scale. For 4X4 LOW Circuit, measure resistance between test pin No. 12 at the breakout box and 4X4 LOW circuit at the 4X4 LOW switch vehicle harness. (Scheme 272): 4X4 LOW Circuit For OCS-OCIL Circuit, measure the resistance between KEY PWR at the fuse panel (shown in step 14), ohmmeter positive lead) and the power side of the OCS harness connector (ohmmeter negative probe). Measure the resistance between test pin No. 41 at the breakout box and the signal side of the OCS harness connector. (Scheme 273): OCS-OCIL Circuit If resistance is less than 5 ohms, go to next step. If not, repair open circuit(s) as necessary, remove breakout box, reconnect components and rerun QUICK TEST.
11. Checking Circuit(s) For Shorts To Power. With key off, ensure breakout box is installed and ECA is disconnected. Set DVOM on 200k-ohm scale. For 4X4 LOW Circuit, disconnect 4X4 LOW switch. Measure resistance between test pin No. 12 and test pins No. 37 and 57 at the breakout box. For OCS-OCIL Circuit, disconnect OCS switch. Measure resistance between test pin No. 41 and test pins No. 37 and 57 at the breakout box. Measure resistance between test pin No. 32 and test pins No. 37 and 57 at the breakout box. If resistance(s) are greater than 10k-ohms, remove breakout box, replace appropriate switch and rerun QUICK TEST. If resistance(s) are not greater than 10k ohms, repair short circuit(s), remove breakout box, reconnect ECA and rerun QUICK TEST.
12. Service Code 91, 92, 93, 94, 98 And 99 Circuit Identification. These service codes indicate that the appropriate On/Off solenoid is out of Self-Test range. This may cause harsh, early or late shifting. Correct voltage is 9.00-14.50 when ON and less than 1.0 volt when OFF. Code 98 indicates Electronic Pressure Control (EPC) solenoid may have a faulty driver in the ECA. Code 99 indicates a faulty EPC circuit which may cause harsh shifting and clutch wear. Possible causes for these codes are: solenoid resistance is out of limits, harness circuit is open or grounded, faulty ECA. Verify code match with the following table. CODE MATCH IDENTIFICATION Solenoid Type ECA Signal Test Pin KOEO Self-Test Code SS1 (1) 52 91 SS2 (2) 19 92 CCS (3) 55 93 CCC (4) 53 94 EPC (5) 38 98/99 (1) SS1 = Shift Solenoid #1. (2) SS2 = Shift Solenoid #2. (3) CCS = Coast Clutch Solenoid. (4) CCC = Converter Clutch Solenoid. (5) EPS = Electronic Pressure Control. If any of the listed codes are present, go to step 15) for 7.3L diesel vehicles or next step for all others. If codes are not present, go to KOEO Self-Test procedures.
13. Enter Output State Check. Turn key off and wait 10 seconds, set DVOM on 20-volt scale. A VOM or DVOM MUST be used for this test. Connect DVOM negative test lead to STO circuit at Self-Test connector and positive test lead to battery positive. Jumper STI circuit to SIGNAL RETURN at the Self-Test connector. Perform KOEO Self-Test until all Continuous Codes have been displayed. DVOM will indicate less than 1.0 volt when test is complete. Depress and release throttle. If voltage increases, remain in Output State Check and go to next step. If voltage does not increase, depress throttle to WOT and release. If STO voltage does not increase, go to «TEST D16 - OUTPUT STATE»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-d16-output-state), step 1), leave test equipment hooked up.
14. Check Suspect E4OD Solenoid Electrical Operation. With KOEO, disconnect transmission solenoid bulkhead connector. Use a mirror to inspect both ends of connector for damage or corrosion. Service or repair as necessary. Connect DVOM positive test lead to VPWR circuit and negative test lead to ECA signal test pin at the bulkhead connector (see step 12). Set DVOM on 20-volt scale. While observing DVOM, depress and release the throttle several times to cycle output on and off. If suspected solenoid output circuit voltage change is greater than 1.0 volt, service or repair solenoid. If voltage change is not greater than 1.0 volt, remove jumper and go to next step.
15. Checking E4OD Transmission Solenoid Resistance. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box, leave ECA disconnected. Connect transmission bulkhead connector. Set DVOM on 200-ohm scale. Measure resistance between test pins No. 37 and 57 and ECA signal test pin at the breakout box. If resistance is within specification, go to step 17). If not, go to next step. SOLENOID RESISTANCE Ambient Temp. °F Solenoid Type Resistance: Ohms -40-32 SS, CCC, CCS 16.0-20.5 -40-32 EPC 3.25-4.25 32-230 SS, CCC, CCS 20.5-30.0 32-230 EPC 4.25-6.50
16. Checking Continuity Of E4OD Solenoid Harness. Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Disconnect transmission bulkhead connector. Set DVOM on 200-ohm scale. Measure resistance between the ECA signal test pin at the breakout box and transmission bulkhead connector. Measure resistance between test pins No. 37 and 57 at the breakout box and EPCPWR and VPWR pins at the E4OD transmission bulkhead connector (refer to circuit diagram at start of test). If all resistances are less than 5 ohms, go to next step. If not, remove breakout box, repair open circuit and reconnect ECA and solenoids. Rerun QUICK TEST.
17. Checking E4OD Solenoid Harness For Short To Ground. Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Ensure transmission bulkhead connector is disconnected. Set DVOM on 200k-ohm scale. Measure resistance between ECA signal test pin (see table at step 12) and test pins No. 40, 46 and 60 at the breakout box. Measure resistance between the ECA signal test pin at the breakout box and chassis ground. If all resistances are greater than 10k-ohms, go to next step. If not, repair short circuit(s), remove breakout box, reconnect ECA and solenoid(s). Rerun QUICK TEST.
18. Checking E4OD Solenoid Harness For Short To Power. Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Ensure transmission bulkhead connector is disconnected. Set DVOM on 200k-ohm scale. Measure resistance between ECA signal test pin (see table in step 12) ) and test pins No. 37 and 57 at breakout box. If all resistances are greater than 10k-ohms, go to next step. If not, repair short circuit(s), remove breakout box, reconnect ECA and solenoid(s). Rerun QUICK TEST.
19. Checking Voltage Of VPWR To E4OD Solenoids. Turn key off and wait 10 seconds. Install breakout box, ensure ECA is connected. Ensure transmission bulkhead connector is disconnected. Set DVOM on 20-volt scale. With KOEO, measure voltage between test pins No. 37 and 57 at the bulkhead connector and chassis or battery ground. If voltage is greater than 10.5 volts, go to next step. If not, replace ECA, reconnect components and rerun QUICK TEST.
20. Check Solenoid Driver Signal. With key off, install breakout box and leave ECA connected. Disconnect transmission bulkhead connector. Connect a test light between test pin No. 37 or 57 and the ECA signal test pin at the breakout box. With KOEO, wait 10 seconds. Initiate KOEO Self-Test. If test light flashes momentarily and then stays off, repair transmission solenoids as necessary, driver signal is okay. If test light does not flash, replace ECA, reconnect solenoid(s) and rerun QUICK TEST. If test light is always on, solenoid driver is shorted to ground in ECA. Replace ECA, reconnect solenoid(s) and rerun QUICK TEST.
21. Code 26: Check Transmission Oil Operating Temperature. Code 26 indicates Transmission Oil Temperature (TOT) sensor is out of Self-Test range. Correct voltage is 0.21-3.50. Possible causes for this fault are: TOT resistance is out of range or ECA is faulty. Drive vehicle normally in city traffic for 20-30 minutes to bring transmission oil temperature to at least 50° F (10°C). In extremely cold weather a longer warm-up drive may be necessary. Rerun QUICK TEST. If code 26 is still present, go to next step. If not, service or repair other codes as necessary.
22. Checking For VREF At Throttle Position Sensor (TPS). (Scheme 234) Turn key off and wait 10 seconds. Disconnect ECA 60 pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box and connect ECA to breakout box. Disconnect TPS and set DVOM on 20-volt scale. With KOEO, measure voltage between VREF and SIGNAL RETURN at the TPS vehicle harness connector. If voltage is 4.0-6.0 volts, reconnect TPS and go to next step. If not, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1).
23. Checking Resistance Of TOT Sensor. Ensure transmission temperature is 50° F (10°C), if transmission has cooled down, repeat test drive. Turn key off and wait 10 seconds. Ensure breakout box is installed and ECA is disconnected. Ensure bulkhead connector is connected at transmission. Set DVOM on 200k-ohm scale. With KOEO, ensure transmission oil pan is "warm to touch" on side away from exhaust manifold. Measure resistance between test pin No. 42 and test pin No. 46 at the breakout box. TRANS. OIL TEMP. (TOT) SENSOR RESISTANCE table. If TOT resistance is within specification, go to next step. If not, repair or replace TOT sensor. TRANS. OIL TEMP. (TOT) SENSOR RESISTANCE Trans. Oil Temp. °F Resistance: Ohms 32-58 37,000-100,000 59-104 16,000-37,000 105-158 5000-16,000 159-194 2700-5000 195-230 1500-2700 231-266 800-1500
24. Checking TOT Sensor Resistance In Relation To Oil Temperature Change. TOT sensor may be within specification range (0.8k-100k ohms) and not correspond to temperature. Ensure transmission fluid is at operating temperature. Measure TOT resistance again and compare to resistance recorded in step 23). If resistance increased or decreased due to temperature change, replace ECA. If not, replace breakout box, reconnect ECA, and replace temperature sensor.
25. Code 56: Attempt To Generate Code 66. Code 56 indicates TOT signal is greater than Self-Test maximum value of 4.80 volts. Possible causes for this fault are: faulty TOT sensor, open harness circuit, faulty ECA. Turn key off and wait 10 seconds. Disconnect transmission bulkhead connector from TOT sensor. Inspect for corroded or damaged pins. Service or repair as necessary. Insert a jumper wire at the bulkhead connector between TOT SIGNAL and SIGNAL RETURN. Run KOEO Self-Test. If Code 66 is present, remove jumper wire and service or replace TOT sensor. If not, remove jumper wire and go to next step.
26. Check Continuity Of TOT SIGNAL And SIGNAL RETURN Circuit. Turn key off and wait 10 seconds. Ensure bulkhead connector is disconnected at transmission. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box, leave ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between TOT SIGNAL at the bulkhead connector and test pin No. 42 at the breakout box. Measure the resistance between SIGNAL RETURN at the bulkhead connector and test pin 46 at the breakout box. If both resistances are less than 5 ohms, replace ECA, remove breakout box, reconnect ECA and bulkhead connector. Rerun QUICK TEST. If resistances are not less than 5 ohms, repair open circuits, remove breakout box and reconnect ECA. Rerun QUICK TEST.
27. Code 66: Attempt To Generate Code 56. Code 66 indicates that TOT signal is less than 0.15 volt (Self-Test minimum value). Possible causes for this fault are: faulty TOT sensor, grounded harness or faulty ECA. Turn key off and wait 10 seconds, disconnect transmission connector from bulkhead connector. Inspect for corroded or damaged pins. Service or repair as necessary. Run KOEO Self-Test. If Code 56 is present, service or replace TOT sensor. If not, go to next step.
28. Checking VREF At TPS. Refer to wiring circuit diagrams in TEST B8 - TPS and TEST B17 - FIPL SENSOR. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box and connect ECA to breakout box. Disconnect TPS and set DVOM on 20-volt scale. With KOEO, measure voltage between VREF and SIGNAL RETURN at the TPS vehicle harness connector. If voltage is 4.0-6.0 volts, reconnect TPS and go to next step. If not, go to «TEST A3 - REF»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-a3-ref-voltage). VOLTAGE, step 1).
29. Checking TOT Signal For Short To Ground. Turn key off and wait 10 seconds. Ensure bulkhead is disconnected at transmission. With breakout box installed and ECA disconnected, set DVOM on 200k-ohm scale. Measure resistance between test pin No. 42 and test pins No. 40, 46 and 60 at the breakout box. If all resistances are greater than 10k-ohms, replace ECA and remove breakout box. Reconnect components and rerun QUICK TEST. If resistances are not greater than 10k-ohms, repair short circuit, remove breakout box and reconnect components. Rerun QUICK TEST.
30. Checking MLP, TOT Sensor And E4OD Solenoid Drive Cycle. Bring engine to operating temperature. Verify transmission fluid level and that all components are connected. Run KOEO Self-Test and record Continuous Memory Codes. If Codes 49, 59 or 69 are present, go to step 36). If Codes are not present, record and clear Continuous Memory Codes. Select "D" range and enable "OD". Drive vehicle in city traffic using moderate acceleration. Hold throttle opening steady while transmission is shifting through all four gears and hold throttle steady for an additional 15 seconds. Apply brakes on coming to a stop and remained stopped for 20 seconds. Repeat previous drive step. Rerun KOEO Self-Test and record Continuous Memory Codes. If a Code 11 is present, go to next step. If Code 29 is present, go to «TEST B12 - VSS»(/ford/club-wagon-e150/1987-1991/remont/testing-diagnostics/#75l-eec-iv-testing__test-b12-vss). For Codes 56, 62, 66, 67 or 99, go to step 32).
31. Attempt To Generate Continuous Memory Code 56, 62, 66, 67 and 99. Before performing any procedures in this step, complete the drive cycle test. Drive vehicle approximately 15 minutes over a rough road to simulate road shock. Observe MIL LED while driving for indication of a fault. If MIL flashes ON and OFF, go to next step. If light does not flash, fault may not be duplicated at this time. Testing is complete.
32. Check Circuit Using KOEO Continuous Monitor Mode. Enter KOEO Continuous Monitor Mode. Observe VOM or STAR LED for indication of a fault while performing the following. For MLP Sensor (Code 67), lightly tap on MLP sensor to simulate road shock. Wiggle connector at MLP sensor. For Transmission Solenoids (Codes 62 or 99) And TOT Sensor (Codes 56 or 66), wiggle transmission bulkhead connector. If a fault is indicated, isolate fault and service or repair as necessary. Clear Continuous Memory Codes and rerun QUICK TEST. If a fault is not indicated, go to step 35).
33. Checking EEC-IV Harness. Ensure vehicle is still in KOEO Continuous Monitor Mode. Observe VOM for an indication of a fault while performing the following: using illustration in step 34), grasp harness close to sensor or transmission connector and perform "Wiggle" test while working from transmission to dash panel and ECA. If a fault is indicated, isolate fault and service as necessary. Clear Continuous Memory Codes and rerun QUICK TEST. If no fault is indicated, go to step 35).
34. (Scheme 274), Circuit Diagram For Continuous Monitor Mode (Scheme 274): E4OD Vehicle Harness Circuit
35. Checking ECA And Harness Connectors. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Disconnect ECA 60 pin connector and inspect for corroded or damaged pins. Service or repair as necessary. If connectors and terminals are okay, fault may not be duplicated at this time. Clear Continuous Memory Codes. If connectors or terminals are faulty, service or repair as necessary. Clear codes and rerun QUICK TEST.
36. Isolating Faults For Continuous Memory Codes 49, 59, and 69. Codes 49, 59 and 69 indicate that the transmission went through 4 consecutive incorrect shifts in an upward or downward shift sequence. When changing a gear the SS1 or SS2 solenoid remained ON or OFF an extended amount of time. Possible causes for these faults are: intermittent harness continuity, stuck shift solenoid. Rerun KOEO Self-Test. If any other codes appear during the KOEO Self-Test in addition to Codes 49, 59 or 69, service other codes first. If not, go to next step.
37. Checking Circuits Using KOEO Continuous Monitor Mode. Enter KOEO Continuous Monitor Mode. Observe VOM or STAR LED for indication of a fault while performing the following: wiggle, shake or bend a small section of system harness while working from dash panel and ECA to transmission bulkhead connector. If a fault is indicated, disconnect connectors and inspect connectors and harness for damage. Clear codes and rerun QUICK TEST. If a fault is not indicated, service or replace SS1 and SS2 solenoids as necessary.

Connector Pin Locations. Scheme 275

7.5L "F" Series EEC-IV Wiring Diagram. Scheme 276

7.5L "E" Series EEC-IV Wiring Diagram. Scheme 277

See also:
• IGNITION SYSTEM
• CONTINUOUS MEMORY MONITOR MODE
• TEST EQUIPMENT HOOK-UP
• VISUAL CHECK & VEHICLE PREPARATION
• TEST D19 - SYSTEM CHECK
• COMPUTED TIMING CHECK
• TEST A1 - NO START
• KOEO CONTINUOUS MEMORY CODE EXCEPTIONS
• TEST D15 - KOEO CODE 15
• B13
• D25
• DIAGNOSIS BY SYMPTOM
• TEST D14 - NO CODES
• TEST D13 - SPARK TIMING
• D17
• B5
• B6
• B8
• B2
• B11
• D3
• D4
• C2
• DYNAMIC RESPONSE OR WIDE OPEN THROTTLE (WOT) CHECK
• ENGINE ID CODES
• FAILURE MODE EFFECTS MANAGEMENT (FMEM), CODE 98
• D5
• C1
• B14
• D10
• D12
• B12
• TEST A3 - REF
• TEST A2 - VEHICLE BATTERY
• TEST D16 - OUTPUT STATE