Diagnosis - Aode & Aode-W (with Eec-Iv) Ford Crown Victoria I

APPLICATION

Note. For 1994 vehicles equipped with EEC-V electronic controls, see AUTO TRANS DIAGNOSIS - AODE & AODE-W W/EEC-V article.

AODE/AODE-W APPLICATION

Note. For AODE/AODE-W transmission mechanical testing and repair, see AUTO TRANS OVERHAUL - AODE & AODE-W article.

INTRODUCTION

The first step in diagnosing any driveability problem is verifying the customer's complaint with a test drive under the conditions the problem reportedly occurred. Before entering self-diagnostics, perform a careful and complete visual inspection. Most transmission control problems result from mechanical breakdowns or poor electrical connections.

Note. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.

DESCRIPTION & OPERATION

Input signals from sensors are sent to the Powertrain Control Module (PCM). The PCM can determine when the time and conditions are right for a shift or converter clutch application. The PCM can also determine line pressure needed to optimize shift feel.

The PCM controls transmission operation through 4 electronic solenoids consisting of 3 On/Off solenoids for shifting and torque converter clutch control and one variable force solenoid for line pressure control. The PCM has built-in self-diagnosis, fail-safe code and warning code display for the main input sensors and solenoid valves.

Note. In addition to transmission fault codes, engine-related fault codes may be output during QUICK TEST procedure. These fault codes pertain to engine performance and must be repaired first as engine performance will greatly affect transmission operation. For information and testing procedures of engine-related fault codes and components, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE.

Air Conditioning Clutch (ACC)

On factory installed A/C system, PCM receives signal voltage from ACC switch indication that the air conditioning compressor clutch is engaged. The PCM uses the ACC switch signal to adjust line pressure to compensate for additional engine load. If the ACC switch fails with closed contacts, line pressure will be slightly low with air conditioning off. If the ACC switch fails with open contacts, line pressure will be slightly high with air conditioning on.

Barometric Pressure (BARO) Sensor

The BARO sensor measures barometric pressure to determine altitude at which vehicle is operating. The PCM uses this to adjust shift speeds. Sensor failure can affect shift feel and speeds at altitude.

Brake On/Off (BOO) Switch

The PCM receives a signal from the BOO switch when the brake switch is operated. Torque converter clutch is disengaged when brakes are applied. Malfunctioning switch will affect torque converter operation.

Coolant Temperature Sensor (ECT)

Engine temperature signal is sent to PCM. Malfunctioning ECT will affect torque converter clutch operation.

Mass Airflow Sensor (MAS)

The MAS signal is used for Electronic Pressure Control (EPC), shift and TCC scheduling. Sensor malfunction will affect shift and TCC scheduling.

Manual Lever Position (MLP)

The PCM monitors a series of step down resistors in the MLP sensor that act as a voltage divider. The voltage signal corresponds with position of the transmission range selector lever. The MLP sensor also contains the neutral/start and backup circuits. Malfunction of the MLP sensor may cause harsh engagements and firm shift feel. Improper shifting or shift selection and no engine cranking may also result.

Output Shaft Speed (OSS) Sensor

The OSS is a magnetic pickup, located at output shaft ring gear. Sensor sends output shaft speed signal to PCM. Sensor failure may cause no TCC lock-up, harsh shifting and incorrect shift speeds.

Profile Ignition Pickup (PIP)

The PIP sensor located in distributor, sends engine RPM and crankshaft position to PCM. Signal received by the PCM affects torque converter clutch operation.

Programmable Speedometer/Odometer Module (PSOM)

The PSOM receives input from rear brake anti-lock sensor, which is mounted on rear axle differential housing. Vehicle speed (mph) signal is output to PCM. PSOM failure may cause harsh engagements, firm shift feel and abnormal shift schedule. Unexpected downshifts may occur at closed throttle and abnormal TCC operation or engages at WOT. Transmission Control Indicator Light (TCIL) may flash.

Throttle Position Sensor (TPS)

The TPS is a potentiometer mounted to the engine throttle body on gasoline engines and fuel injection pump on diesel engines. The PCM receives a signal from the TPS relaying throttle plate position (gas engines) or fuel delivery (diesel engines). TPS failure will cause PCM to operate in fail safe mode and raise line pressure to prevent transmission damage. This condition will result in harsh engagements, firm shift feel, abnormal shift schedule and TCC not engaging or cycling.

Transmission Control Switch (TCS)

Switch is located on the end of the shift lever handle. On/Off operation is displayed by Transmission Control Indicator Light (TCIL). Switch controls operation of 4th gear. Malfunction of switch will cause lack of 4th gear disable function.

Transmission Oil Temperature (TOT) Sensor

The TOT sensor is located on the solenoid body assembly. The PCM monitors voltage across the TOT thermistor to determine transmission temperature. Depending on temperature, the PCM controls line pressure, shift scheduling and TCC operation. Malfunction of sensor will cause incorrect line pressure and possible lack of TCC operation.

Vehicle Speed Sensor (VSS)

The VSS is a magnetic pickup that sends vehicle speed signal to the PCM. Malfunction of sensor may cause harsh engagements of shifts. Lack of 4th gear, TCC lock-up, or engine braking in 2nd or 3rd gear may also be present.

Electronic Pressure Control (EPC) Solenoid

The EPC receives signal from the PCM to control line pressure and 2-3 backout valve function. If EPC fails in ON position, transmission is operated in failsafe mode. Minimum line pressure is present. If EPC fails in OFF position, line pressure at maximum pressure. Harsh engagements and shifts will result.

Shift Solenoid Assemblies

1. Two ON/OFF solenoids are used for electronic shift scheduling. Solenoids used are Shift Solenoid No. 1 (SS1) and Shift Solenoid No. 2 (SS2). Solenoids control pressure to 3 shift valves and forward clutch control valve, located in valve body. See «SOLENOID OPERATION CHART»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). SOLENOID OPERATION CHART Gear Position SS1 SS2 "OD" (Overdrive) (1) Park On Off Reverse On Off Neutral On Off 1st Gear On Off 2nd Gear Off On 3rd Gear Off On 4th Gear On On "D" Or "3" (2) 1st Gear On Off 2nd Gear Off Off 3rd Gear Off On Manual 2 Off Off Manual 1 (3) On Off Manual 1 Off Off (1) "OD" switch released. (2) "OD" switch depressed (OD canceled). (3) Transmission is in 2nd gear until vehicle speed drops below calibrated speed.
2. When shift solenoid is "Always Off", failure could be due to PCM and/or vehicle wiring malfunction, and/or solenoid electrically stuck off, and/or hydraulically or mechanically stuck off. For shift symptoms (Scheme 24)
3. When shift solenoid is "Always On", failure could be due to PCM and/or vehicle wiring malfunction, and/or solenoid electrically stuck off, and/or hydraulically or mechanically stuck off. For shift symptoms (Scheme 26)

Torque Converter Clutch (TCC) Solenoid

The TCC receives signal from the PCM. The TCC controls application, modulation and release of torque converter clutch. If solenoid fails in ON position, vehicle engine will run rough (shudder) and engine stalls in Drive at low idle speeds (2nd, 3rd or 4th gear). If solenoid fails in OFF position, torque converter clutch will not engage.

Scheme 24

Scheme 25

Scheme 26

Scheme 27

PRELIMINARY INSPECTION

Visually inspect all electrical wiring, looking for chafed, stretched, cut or pinched wiring. Ensure electrical connectors fit tightly and are not corroded. Ensure vacuum hoses are properly routed and are not pinched or cut. Inspect air induction system for possible vacuum leaks. Check PCM, sensors and actuators for physical damage. Check engine coolant level. Check transmission fluid level and condition.

Note. In addition to transmission fault codes, engine-related fault codes may be output during QUICK TEST procedure. These fault codes pertain to engine performance and must be repaired first as engine performance will greatly affect transmission operation. For information and testing procedures of engine-related fault codes and components, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE.

DIAGNOSTIC FORMATS

QUICK TEST, CIRCUIT/PINPOINT TESTS are diagnostic formats used to test and service EEC-IV system. QUICK TEST allows technician to identify problems and retrieve service codes. CIRCUIT TESTS check engine circuits, sensors and actuators. PINPOINT TESTS check transmission circuits, sensors and actuators.

Before starting any circuit test, follow all steps under QUICK TEST to find correct circuit or pinpoint test. If vehicle passes QUICK TEST and no driveability symptoms or intermittent faults exist, EEC-IV system is okay.

DIAGNOSTIC TROUBLE CODES (DTC)

During QUICK TEST, 3 types of service codes are retrieved: Key On Engine Off (KOEO), Key On Engine Running (KOER) and Continuous Memory Codes. See DESCRIPTION & OPERATION under QUICK TEST for self-test procedures. Codes may be cleared from PCM memory after they have been recorded or repaired. See CLEARING CODES .

KOEO & KOER Codes (Hard Faults)

These codes indicate faults are present at time of testing. A hard fault may cause CHECK ENGINE light or Malfunction Indicator Light (MIL) to glow and remain on until fault is repaired. If KOEO or KOER codes are retrieved during KOEO SELF-TEST or KOER SELF-TEST, use CODE REFERENCE CHART to find correct testing and repair procedures.

Continuous Memory Codes (Soft Faults)

These codes indicate a fault that may or may not be present at time of testing. These codes are used to diagnose intermittent problems. Continuous Memory Codes are retrieved during KOEO SELF-TEST. Some codes may turn on MIL or CHECK ENGINE light. Corresponding soft trouble code will be retained in PCM memory. If fault does not reoccur within 40 warm-up cycles (80 cycles on some models), PCM will automatically clear code. Technician may clear service codes from memory. See CLEARING CODES . Intermittent faults may be caused by a sensor, connector or wiring-related problems.

RETRIEVING CODES

Service codes are retrieved from EEC-IV system through self-test connector. Various methods and test equipment may be used to access these codes

1. Analog Volt-Ohmmeter (VOM)
2. Scan Tester
3. In-Dash Malfunction Indicator Light (MIL) Or CHECK ENGINE light
4. STAR Series Tester

KOEO & KOER SELF-TEST Codes

PCM outputs codes one digit at a time. Record codes in order received. These codes indicate current faults in system and should be serviced in order of appearance. Use CODE REFERENCE CHART to find correct CIRCUIT/PINPOINT TEST.

If using analog VOM, pay careful attention to length of pauses in order to read codes correctly. A 1/2-second pause occurs between number of sweeps in a digit. A 2-second pause occurs between digits in a code. A 4-second pause occurs between each code. KOEO codes are separated from Continuous Memory codes by a 6-second delay, a 1/2-second sweep (separator) and another 6-second delay. (Scheme 26) If using MIL/CHECK ENGINE light, service codes are displayed as flashes.

Scan tester, if used, will count pulses and display them as a digital code. STAR Series Tester will add a zero (0) to single-digit Separator Code (10) and Dynamic Response Code (10). Dynamic Response Code is displayed in KOER SELF-TEST. (Scheme 28)

Engine Identification (ID) Codes

Engine ID codes are issued at beginning of KOER SELF-TEST. Codes are one-digit numbers represented by number of pulses displayed. (Scheme 28) Engine ID code is equal to one-half the number of engine cylinders. For example, 2 pulses would indicate that engine is a 4 cylinder. ID code is used to verify proper PCM is installed and that SELF-TEST has been entered.

Separator Pulse

Single 1/2-second separator pulse is issued 6-9 seconds after last KOEO code. Continuous Memory Codes (soft faults) are then displayed 6-9 seconds after 1/2-second separator pulse. Some digital test equipment may display separator code as "10" instead of "1".

Pass Codes

A Code 11 or 111 indicates no service codes were recorded in that portion of test; system passes that portion of test. If Code 11 or 111 is not retrieved in KOEO SELF-TEST, codes retrieved during KOER SELF-TEST may not be valid. Code 11 or 111 (pass code) must be obtained in KOEO SELF-TEST. A Code 11-1-11 or 111-1-111 output during KOEO SELF-TEST indicates no KOEO code or Continuous Memory Code was recorded.

Continuous Memory Codes

These codes result from information stored by PCM during continuous self-test monitoring. Codes are displayed after separator pulse code in KOEO SELF-TEST. Use these codes for diagnosis only when KOEO SELF-TEST and KOER SELF-TEST result in Code 11 or 111 (pass code) and all steps under QUICK TEST are successfully completed. A few codes are exceptions which may be checked after KOEO codes have been repaired. These codes indicate faults recorded within last 40 engine starts (80 engine starts on some models). Fault may or may not be currently present. See CODE REFERENCE CHART .

Fast Codes

At start of KOEO SELF-TEST and after Wide Open Throttle (WOT) request in KOER SELF-TEST, PCM outputs short bursts of information, known as FAST CODES, which were used by manufacturer during assembly. With most equipment, these code bursts are not visible; an entire code sequence lasts less than 1/2 second. If this fluctuation is visible on test equipment, ignore it.

Scheme 28

CLEARING CODES

To clear codes from PCM memory, start KOEO SELF-TEST under QUICK TEST. When service codes appear on test equipment or CHECK ENGINE light, disconnect jumper wire from Self-Test Input (STI) connector. If using STAR Series Tester, unlatch center button. This procedure erases Continuous Memory Codes from PCM memory. If problem has not been corrected or fault is still present, hard code will immediately be reset in PCM memory.

Description

Following procedures are functional tests of EEC-IV system. These following 4 basic test steps must be carefully followed in sequence, otherwise misdiagnosis or replacement of non-faulty components may result

1. VISUAL CHECK
2. EQUIPMENT HOOKUP.
3. KOEO SELF-TEST.
4. KOER SELF-TEST.

Diagnostic Aids

After each service or repair procedure has been completed, repeat QUICK TEST to ensure all EEC-IV systems work properly and service codes are no longer present.

VISUAL CHECK

Complete a basic inspection of engine compartment and all components before proceeding to self-diagnostic tests. Ensure vacuum hoses and EEC-IV wiring harnesses are properly connected.

EQUIPMENT HOOKUP

Apply parking brake, and place shift lever in "P" position. Block drive wheels. Turn off all electrical loads. Connect appropriate test equipment to vehicle as follows

Analog Volt-Ohmmeter (VOM)

1. Turn ignition switch to OFF position. Set VOM at 0-15V DC range. Connect positive lead of VOM to positive battery terminal.
2. Connect negative VOM lead to Self-Test Output (STO) terminal of self-test connector. (Scheme 27) Connect timing light, and go to «KOEO SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__koeo-self-test). Activate KOEO SELF-TEST by connecting jumper wire from Self-Test Input (STI) pigtail to signal return terminal of self-test connector with ignition on.

Scan Tester

Follow manufacturer's instructions to hook up equipment and record service codes.

STAR Series Tester

Turn ignition switch to OFF position. Connect color-coded adapter cable leads to diagnostic tester. Connect 2 service connectors of adapter cable to vehicle self-test connector and STI pigtail connector. Connect timing light. Go to KOEO SELF-TEST .

CHECK ENGINE Light/Malfunction Indicator Light (MIL)

Turn ignition on. Connect a jumper wire between Self-Test Input (STI) pigtail and signal return (SIG RTN) terminal of Data Link Connector (DLC). (Scheme 29) Go to KOEO SELF-TEST.

Scheme 29

KOEO SELF-TEST

Ensure engine is at normal operating temperature. If engine does not start (or stalls after starting), continue KOEO SELF-TEST. DO NOT depress throttle on gasoline vehicles. Turn ignition off. Wait 10 seconds. Ensure test equipment is properly attached. Turn ignition on (engine off). Record all KOEO and Continuous Memory Codes.

If a Code 11 or 111 (pass code) is not retrieved in KOEO portion of test, service KOEO codes at this time. Service any engine codes recorded before servicing transmission codes (codes No. 566 and 629). If PCM will not output codes, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE. If service codes are retrieved observe the following procedures

1. If CHECK ENGINE or SERVICE ENGINE SOON light is on, service codes in order retrieved.
2. On vehicles equipped with DIS and EDIS ignition systems, see appropriate SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section.
3. If Continuous Memory Code 211, 212, 215, 216, 217, 232 or 238 is retrieved during KOEO SELF-TEST. Repair ignition system as necessary.
4. If vehicle has a no-start condition, go to CIRCUIT TEST AA, AB or AC in appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section.

DO NOT enter this test sequence until a Code 11 or 111 (pass code) has been retrieved in KOEO SELF-TEST. If system has not passed KOEO SELF-TEST, codes recorded in KOER SELF-TEST may not be valid.

Deactivate self-test by removing and reconnecting jumper wire or by procedure specified by test equipment in use. Start engine, and run it for 2 minutes at 2000 RPM to warm Heated Exhaust Gas Oxygen (HEGO) sensor. Turn engine off, and wait 10 seconds. Activate KOER SELF-TEST using a jumper wire or appropriate procedure for test equipment used. Start engine. Record all service codes displayed. Check following items

1. If engine starts and stalls (or stalls during self-test), go to CIRCUIT TEST S. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE. See menu below.
2. If Code 98 or 998 is displayed, EEC-IV system is operating in Failure Management Effects Mode (FMEM) and vehicle has not passed KOEO SELF-TEST. Vehicle cannot be diagnosed while in FMEM mode. See Code 98 or 998 in «CODE REFERENCE CHART»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
3. If vehicle is equipped with a Brake On-Off (BOO) switch, brake pedal must be depressed and released after ID code portion of test.
4. If Dynamic Response Code appears, perform a brief Wide Open Throttle (WOT). DO NOT perform WOT unless requested.
5. If a Code 11 or 111 (pass code) is retrieved during KOER SELF-TEST, service Continuous Memory Codes retrieved in KOEO SELF-TEST. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE.
6. If a Code 11 or 111 (pass code) is retrieved during Continuous Memory Code portion of KOEO SELF-TEST (Code 11-1-11 or Code 111-1-111) and no driveability problem exists, EEC-IV testing is complete. If driveability problems are still present, go to TROUBLESHOOTING in «AUTO TRANS OVERHAUL - AODE & AODE-W»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#overhaul-aode-aode-w) article.
7. If KOER codes are present, see «CODE REFERENCE CHART»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If system will not output codes, go to «CIRCUIT TEST QA»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .

CONTINUOUS MONITOR MODE (WIGGLE TEST)

Continuous Monitor Mode allows technician to attempt to recreate an intermittent fault while monitoring system. This mode, also called wiggle test, may be used in both KOEO SELF-TEST and KOER SELF-TEST. CIRCUIT/PINPOINT TESTS specify use of this procedure to identify intermittent faults in specific circuits or components.

KOEO Wiggle Test Procedure

Connect test equipment. (Scheme 29) Turn ignition on, and activate self-test using jumper lead or diagnostic tester. Wait 10 seconds, and then deactivate and reactivate self-test. Wiggle test mode is now activated. Tap, move and wiggle suspect sensor and/or harness area. If a fault is detected, a service code may be stored in memory and indicated at diagnostic tester or scan tester. Retrieve code, and perform appropriate test. See CODE REFERENCE CHART.

KOER Wiggle Test Procedure

Connect test equipment. (Scheme 29) Turn ignition off, and wait 10 seconds. Start engine. Activate self-test using jumper lead or diagnostic tester. Wait 10 seconds, and then deactivate and reactivate self-test. DO NOT turn engine off. KOER wiggle test mode is now activated. Tap, move and wiggle suspect sensor and/or harness area. If a fault is detected, a service code may be stored in memory and indicated at diagnostic tester or scan tester. Retrieve code, and perform appropriate test. See CODE REFERENCE CHART.

TRANSMISSION DRIVE CYCLE TEST

Note. The transmission drive cycle test must be followed exactly. Malfunctions have to occur 4 times consecutively for codes 617, 618 and 619 to be set and 5 times consecutively for continuous code 628.

1. Record and then erase Quick Test codes. Warm engine to normal operating temperature. Ensure transmission fluid level is correct. Shift transmission to overdrive (OD).
2. Accelerate from stop to 50 mph. Hold speed for at least 15 seconds (30 seconds above 4000 ft.). Press TCS and accelerate to 50 mph. Hold speed for at least 15 seconds (30 seconds above 4000 ft.). Hold speed and throttle position steady for at least 15 seconds. While maintaining speed with transmission in 4th gear, lightly depress brake pedal and release. Maintain speed for additional 5 seconds. Bring vehicle to stop for at least 20 seconds. Repeat steps 1) and 2) at least 5 times. Perform Quick Test and record continuous codes.

DIAGNOSTIC SYSTEM - ADDITIONAL SYSTEM FUNCTIONS

Additional diagnostic system features are available to help diagnose driveability problems and service EEC-IV systems.

CHECK ENGINE Light & Malfunction Indicator Light (MIL)

CHECK DCL light, CHECK ENGINE light and MIL are intended to alert driver of certain malfunctions in EEC-IV system.

Light may also be used to retrieve service codes stored in PCM. When hooked up for KOEO SELF-TEST or KOER SELF-TEST, light will display all codes which turn on light during vehicle operation, not just Continuous Memory Codes.

If light comes on during vehicle operation, vehicle should be inspected as soon as possible. Immediately turning off engine is not necessary; vehicle can be driven with light on.

If light comes on and then goes off during vehicle operation, code causing light to glow will be stored in PCM memory as a Continuous Memory Code.

Light should come on when ignition is turned on and go out when engine is started. If hard fault codes are not present, PCM turns out light when it receives a Profile Ignition Pick-Up (PIP) signal. If light does not come on, see SYMPTOMS in appropriate TESTS W/O CODES article in ENGINE PERFORMANCE

1. For 1993 Crown Victoria, see «TESTS W/O CODES - EEC-IV»(ref-22791)
2. For 1993 E-150 5.0L SFI, see «TESTS W/O CODES»(ref-22823)
3. For 1993 Grand Marquis, see «TESTS W/O CODES - EEC-IV»(ref-22791)
4. For 1993 Mark VIII, see «TESTS W/O CODES - EEC-IV»(ref-22791)
5. For 1993 Town Car, see «TESTS W/O CODES - EEC-IV»(ref-22791)
6. 1994 Cougar/T-Bird 3.8L «TESTS W/O CODES - EEC-IV (3.8L)»(ref-22899)
7. 1994 Cougar/T-Bird 4.6L «TESTS W/O CODES - EEC-V (4.6L)»(ref-22936)
8. For 1994 Crown Victoria «TESTS W/O CODES - EEC-IV (4.6L)»(/ford/crown-victoria/i-1992-1997/remont/testing-diagnostics/#engine-controls-tests-wo-codes-eec-iv-46l)
9. For 1994 E-150 5.0L SFI, see «TESTS W/O CODES»(ref-22980)
10. For 1994 F-150 5.0L SFI, see «TESTS W/O CODES»(ref-22976)
11. For 1994 Grand Marquis «TESTS W/O CODES - EEC-IV (4.6L)»(/ford/crown-victoria/i-1992-1997/remont/testing-diagnostics/#engine-controls-tests-wo-codes-eec-iv-46l)
12. For 1994 Mark VIII, see «TESTS W/O CODES - EEC-IV (4.6L)»(/ford/crown-victoria/i-1992-1997/remont/testing-diagnostics/#engine-controls-tests-wo-codes-eec-iv-46l)
13. For 1994 Mustang 3.8L, see «TESTS W/O CODES - EEC-V (3.8L)»(ref-22901)
14. For 1994 Mustang 5.0L see «TESTS W/O CODES - EEC-IV (5.0L)»(ref-22934)
15. For 1994 Town Car, see «TESTS W/O CODES - EEC-IV (4.6L)»(/ford/crown-victoria/i-1992-1997/remont/testing-diagnostics/#engine-controls-tests-wo-codes-eec-iv-46l)

Output State Check

Output State Check is used as an aid in servicing output actuators associated with EEC-IV system. It allows technicians to energize and de-energize most system output actuators on command. This mode is entered from KOEO SELF-TEST after all codes have been retrieved. Leave SELF-TEST activated, and depress throttle to initiate test sequence. Each time throttle is depressed and released, output actuators will change state (from on to off or off to on).

Failure Mode Effects Management (FMEM), Code 98 Or 998

FMEM mode allows system operation when sensors fail or transmit signals that are out of normal operating range. During FMEM mode, PCM substitutes a mid-range signal for defective sensor while continuing to monitor sensor. If faulty sensor's signals return to normal operating range, PCM will use those signals. A Code 98 or 998 will be displayed when FMEM mode is in effect.

Hardware Limited Operational Strategy (HLOS)

If a number of system or sensor failures are present and PCM is not receiving enough information to operate, PCM will switch to HLOS mode. PCM will output fixed values to allow operation of vehicle. Driveability concerns will be present. PCM will not output service codes in this mode.

SUMMARY

If no service codes (or pass code 11-1-11 or 111-1-111) is present but driveability problem still exists, return to TROUBLE-SHOOTING in AUTO TRANS OVERHAUL - AODE & AODE-W article.

CODE-TO-TEST MENU

Note. In addition to transmission fault codes, engine-related fault codes may be output during QUICK TEST procedure. These fault codes pertain to engine performance and must be repaired first as engine performance will greatly affect transmission operation. For information and testing procedures of engine-related fault codes and components, see appropriate TESTS W/ CODES article in ENGINE PERFORMANCE.

CODE REFERENCE CHART

Scheme 30

1. AODE/AODE-W Electronic Diagnostics Ensure transmission harness connector is in acceptable condition. Repair as necessary. Disconnect transmission harness connector. Connect Transmission Tester (007-0085A) or equivalent to transmission. Perform «TRANSMISSION DRIVE CYCLE TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__transmission-drive-cycle-test) under QUICK TEST. Perform KOEO test until Continuous Memory trouble code(s) have been displayed. See DESCRIPTION & OPERATION under «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). Depress throttle to WOT and release. If vehicle enters Output State, go to next step. If vehicle will not enter Output State, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE.
2. Check Electrical Signal Operation Disconnect transmission harness connector. Inspect condition of connector and repair as needed. Using DVOM (20-volt scale), connect positive lead to transmission harness connector VPWR terminal. (Scheme 30) Connect negative lead to suspect solenoid circuit. Depress and release throttle to cycle solenoid output. If voltage changes at least.5 volts, go to step 5). If voltage is unaffected, go to next step. (Scheme 30): Identifying Transmission Shift Solenoid Harness Connector BREAKOUT BOX TEST PIN REFERENCE CHART Component Circuit (1) BOB Test Pin EPC 38 EPC VPWR 37/57 SS1 51 SS2 52 SS VPWR 37/57 TCC 53 TCC VPWR 37/57 TOT Return 46 TOT 49 (1) see scheme 8
3. Check Continuity Of Solenoid Signal & VPWR Harness Circuits Ensure ignition is off. Disconnect PCM 60-pin connector, and inspect it for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (007-00033), leaving PCM disconnected. Measure and record resistance between Breakout Box test pin No. 51 or 52 and corresponding transmission harness connector terminal. (Scheme 30)Measure and record resistance. Measure and record resistance between test pins No. 37 and 57 and transmission harness connector VPWR terminal. If any resistance is greater than 5 ohms, repair open circuit. Connect all components. Disconnect Breakout Box and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If resistance is 5 ohms or less, go to next step.
4. Check Solenoid Harness For Shorts To Power & Ground Measure and record resistance between Breakout Box test pins No. 51 or 52 and test pins No. 37 and 57. Measure and record resistance between test pins No. 40, 46 and 60, and ground. If any resistance is less than 10 k/ohms, repair short circuit. Connect all components. Disconnect Breakout Box and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If resistance is 10 k/ohms or more, go to next step.
5. Solenoid Functional Test Connect transmission Tester (007-00085). Perform solenoid function test. See tester instructions. If solenoid activates (LED green), go to next step. If solenoid does not activate, go to step 7).
6. Transmission Drive Test Perform tester drive test. See tester instructions. If vehicle upshifts when operated with tester, go to TROUBLE SHOOTING in «AUTO TRANS OVERHAUL - AODE & AODE-W»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#overhaul-aode-aode-w) article. If vehicle does not upshift when operated by tester, go to next step.
7. Check Resistance Of Solenoid Set tester Bench/Drive switch to Bench mode. Set Gear Selector switch to ohms check. Connect ohmmeter negative lead to SS1 jack and positive lead to VPWR jack on tester. Measure and record resistance. Connect ohmmeter negative lead to SS2 jack and positive lead to VPWR jack on tester. Measure and record resistance. Resistance for all solenoids should be 20-30 ohms. If resistance is within specification, go to next step. If resistance is not within specification, go to step 9).
8. Check Solenoid For Short To Ground Check continuity between BAT(-) terminal and between SS1 and SS2. Check continuity between BAT(+) terminal and VPWR terminal. If continuity exists for any circuit, go to the next step. If continuity does not exist, refer to the appropriate TROUBLE SHOOTING procedure in «AUTO TRANS OVERHAUL - AODE & AODE-W»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#overhaul-aode-aode-w) article.
9. AODE/AODE-W Internal Electronic Diagnostics Drain transmission fluid. See TRANSMISSION SERVICING section. Remove transmission side pan. Refer to OIL PUMP & VALVE BODY ASSEMBLY procedures under ON-VEHICLE SERVICE in appropriate «AUTO TRANS OVERHAUL - AODE & AODE-W»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#overhaul-aode-aode-w) article. Inspect all internal harness connectors. Ensure all connectors are fully connected and not damaged. Repair as needed. Install all components in reverse order of disassembly. Fill transmission with fluid. Erase all trouble codes. See «CLEARING CODES»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__clearing-codes). Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If all connectors are okay, go to next step.
10. Check Internal Harness Continuity Disconnect internal harness from solenoid assemblies. To test SS1, connect positive lead of ohmmeter to tester SS-1 jack and negative lead to SS1 White wire. Measure and record resistance. To test SS2, connect positive lead of ohmmeter to tester SS-2 jack and negative lead to SS2 Black wire. Measure and record resistance. Measure and record resistance. To test SS1 and SS2 VPWR circuits, connect positive lead of ohmmeter to selected solenoid White/Black wire. Connect negative lead to corresponding VPWR tester terminal. Measure and record resistance. If all resistances measured are.5 ohms or less, go to next step. If any resistance measured is more than.5 ohms, replace internal harness. Go to step 12).
11. Check Internal Harness For Shorts To Ground Using transmission tester, check continuity between each solenoid lead and BAT(-) terminal of tester. If continuity does not exist in any circuit, go to next step. If continuity exists in any circuit, replace internal harness. Go to Install all components in reverse order of disassembly. Fill transmission with fluid. Erase all trouble codes. See «CLEARING CODES»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__clearing-codes). Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv).
12. Check Resistance Of Solenoid Using ohmmeter, check resistance between terminals of each solenoid. Resistance should be 20-30 ohms. If resistance is within specification, go to next step. If resistance measured for any solenoid is not within specification, replace solenoid assembly. Install all components in reverse order of disassembly. Fill transmission with fluid. Erase all trouble codes. See «CLEARING CODES»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__clearing-codes). Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv).
13. Check Solenoid For Short To Ground Using ohmmeter, check continuity between each solenoid terminal and ground. If continuity exists, replace shift solenoid assembly. If continuity does not exist, refer to TROUBLE SHOOTING in the «AUTO TRANS OVERHAUL - AODE & AODE-W»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#overhaul-aode-aode-w) article. Install all components in reverse order of disassembly. Fill transmission with fluid. Erase all trouble codes. See «CLEARING CODES»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__clearing-codes). Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv).

CIRCUIT TESTS - USING CIRCUIT TESTS

Note. A breakout box, connected to vehicle harness at PCM, is necessary to perform most circuit tests. References to Test Pin No. found in CIRCUIT/PINPOINT TEST steps refer to test terminals on manufacturer breakout box. Circuit diagrams at beginning of each test identify circuit and wire colors.

HOW TO USE CIRCUIT/PINPOINT TESTS

1. DO NOT perform any CIRCUIT/PINPOINT TEST unless specifically instructed by a QUICK TEST procedure. Follow each test step in order until fault is found. DO NOT replace any part unless directed to do so. When more than one code is retrieved, start with first code displayed.
2. CIRCUIT/PINPOINT TESTS ensure electrical circuits are okay before sensors or other components are replaced. Always test circuits for continuity between sensor and PCM. Test all circuits for short to power, opens or short to ground. Voltage Reference (VREF) and Voltage Power (VPWR) circuits should be tested with KOEO or as specified in CIRCUIT/PINPOINT TESTS.
3. DO NOT measure voltage or resistance at PCM. DO NOT 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 ignition off when checking for shorts or continuity, unless instructed otherwise.
4. Disconnect solenoids and switches from harness before measuring continuity and resistance or applying voltage. After each repair, check all component connections and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
5. An open circuit is defined as a resistance reading of greater than 5 ohms. This specification tolerance may be too high for some items in EEC-IV system. If resistance approaches 5 ohms, always clean suspect connector and coat it with protective dielectric silicone grease. A short is defined as a resistance reading of less than 10 k/ohms to ground, unless stated otherwise in CIRCUIT/PINPOINT TEST.

Fuel-contaminated engine oil may set some codes and effect engine performance. If oil is suspect, remove PCV valve from valve cover and repeat QUICK TEST . If problem is corrected, change engine oil.

Note. In following tests, circuit diagrams and illustrations are courtesy of Ford Motor Co.

PINPOINT TESTS INFORMATION

Note. PINPOINT TESTS are diagnostic formats used to test and service EEC-IV system. PINPOINT TESTS check transmission circuits, sensors and actuators.

CIRCUIT TESTS INFORMATION

Note. CIRCUIT TESTS are diagnostic formats used to test and service EEC-IV system. CIRCUIT TESTS check engine circuits, sensors and actuators.

PINPOINT TEST B - TOT ELECTRICAL SYSTEM

PINPOINT TEST C - TCC ELECTRICAL SYSTEM

Note. Transmission tester TCC terminals may be designated MCCC. Refer to tester instructions.

PINPOINT TEST D - MLP SENSOR

Note. Code 634 may be set if transmission is not in park or A/C is on when QUICK TEST is performed.

MLP Resistance Specification Chart. Scheme 31

PINPOINT TEST E - EPC SOLENOID

PINPOINT TEST F - OUTPUT SHAFT SPEED SENSOR

Perform this test when a check for VREF signal has failed in sensor input CIRCUIT TEST QA . SIG RTN is a dedicated ground used by most EEC-IV system sensors. VREF is a 5-volt reference voltage that is continuously output by PCM. This consistent voltage signal is used on all 3-wire sensors.

This circuit test is only intended to diagnose the following components and circuits

1. Powertrain Control Module (PCM).
2. Vehicle wiring harness circuits (SIG RTN and VREF).

Identifying Reference Voltage Circuits & Connector Terminals. Scheme 32

TEST PIN WIRE COLOR IDENTIFICATION

1. 8) Check VREF Circuit For Short To Ground Turn ignition off. Disconnect PCM. Disconnect TPS, MAP/BARO sensor and EVP/PFE/DPFE sensor. Measure resistance between test pin No. 26 and test pins No. 20, 40, 46 and 60. If any resistance is less than 1000 ohms, repair short to ground. Remove breakout box, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If original problem still exists, replace PCM and repeat QUICK TEST. If readings are 1000 ohms or more, replace PCM and repeat QUICK TEST.

Perform this test only when directed by QUICK TEST. Ambient air temperature must be at least 50°F (10°C) to receive valid input from IAT sensor. Engine coolant temperature must be greater than 50°F (10°C) to pass KOEO SELF-TEST and greater than 180°F (82°C) to pass KOER SELF-TEST. Voltage values in this test are based on a 5-volt VREF signal. Values may vary up to 15% due to sensor and VREF variations.

This circuit test is intended to diagnose the following components and circuits

1. Intake Air Temperature (IAT) sensor.
2. Engine Coolant Temperature (ECT) sensor.
3. Wiring harness circuits (IAT, ECT and SIG RTN).
4. Powertrain Control Module (PCM).

To prevent replacing good components, ensure the following non-EEC areas or components are not cause of problem

1. Coolant level low.
2. Cooling system, water pump or fan.
3. Engine operating temperature.
4. Engine oil level low.
5. Thermostat.
6. Air cleaner duct.
7. Ambient temperature.

Identifying Temp. Sensor Circuits & Connector Terminals. Scheme 33

TEST PIN WIRE COLOR IDENTIFICATION

1. 10) Code 118 Or 113: Induce Opposite Code (Code 117 Or 112) Code 118 (ECT) or 113 (IAT) indicate corresponding sensor signal is greater than self-test maximum. Maximum signal voltage for ECT and IAT sensor is 4.6 volts. Possible causes for excess voltage signals are: Open circuit in wiring harness (IAT or ECT). Faulty connection. Faulty sensor. Faulty PCM. Turn ignition off. Disconnect suspect temperature sensor. Connect a jumper wire between SIG RTN terminal at sensor and SIG RTN terminal at sensor wiring harness connector. Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If Code 112 or 117 is displayed, replace suspect sensor and repeat QUICK TEST. If Code 112 or 117 is not displayed, remove jumper wire and go to next step.
2. 11) Check Continuity Of Sensor Signal & SIG RTN Circuits Turn ignition off. Ensure suspect temperature sensor is disconnected. Disconnect PCM 60-pin connector. Check for damaged wiring, and repair as necessary. Install Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between test pin No. 7 (ECT sensor) or test pin No. 25 (IAT sensor) at breakout box and SIG RTN terminal at sensor wiring harness connector. Also measure resistance between test pin No. 46 and SIG RTN circuit at sensor wiring harness connector. If both readings are less than 5 ohms, replace PCM and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If either reading is 5 ohms or more, repair open circuit and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 11) to step 20). No test procedures have been omitted.
3. 20) Code 117 or 112: Induce Opposite Code (118 or 113) Code 117 (ECT) or 112 (IAT) indicates sensor signal is less than self-test minimum. Minimum signal for IAT and ECT sensor is 0.2 volt. Possible causes for this fault are: Circuit grounded in wiring harness. Faulty sensor. Faulty PCM. Faulty connection. Turn ignition off. Disconnect wiring harness connector from suspect sensor. Check for damaged wiring, and repair as necessary. Repeat «KOEO SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__koeo-self-test) . If Code 113 or 118 is displayed, replace sensor and connect harness. Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If Codes 113 or 118 is not displayed, go to step 21).
4. 21) Check VREF Circuit Voltage At TPS Turn ignition off. Disconnect wiring harness connector from suspect sensor. Disconnect TPS. Turn ignition on. Measure voltage between VREF and SIG RTN at TPS wiring harness connector. If voltage is not 4-6 volts, go to «CIRCUIT TEST CA»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage is 4-6 volts, connect TPS and go to step 22).
5. 22) Check Temperature Sensor Signal For Shorts To Ground Turn ignition off. Disconnect suspect sensor. Disconnect PCM 60-pin connector. Check for damaged wiring, and repair as necessary. Install Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between test pin No. 7 (ECT) or 25 (IAT) and pins No. 40, 46 and 60. If any reading is less than 10 k/ohms, repair short circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If all readings are 10 k/ohms or more, replace PCM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 22) to step 90). No test procedures have been omitted.
6. 90) Continuous Memory Code 118, 113, 117 Or 112: Check Sensor A Continuous Memory Code 118 or 113 indicates sensor signal is greater than self-test maximum of 4.6 volts. Code is set during normal driving conditions. Continuous Memory Code 117 or 112 indicates sensor signal is less than self-test minimum of 0.2 volt. Code is set during normal driving conditions. Possible causes for these faults are: Faulty sensor. Open or grounded circuit in harness. Faulty PCM. SENSOR CODES Sensor Continuous Memory Code IAT 113 or 112 ECT 118 or 117 Enter KOEO wiggle test mode. See CONTINUOUS MONITOR MODE (WIGGLE TEST) under «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . Observe analog voltmeter or scan tester for indication of fault while tapping sensor lightly and wiggling sensor connector. If fault is indicated, disconnect and inspect connector and terminals. If connector and terminals are okay, replace sensor, clear continuous memory and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If fault is not indicated, go to step 91).
7. 91) Check EEC-IV Wiring Harness While in CONTINUOUS MONITOR MODE (WIGGLE TEST), observe analog voltmeter or scan tester while wiggling and bending wiring harness, a small section at a time, from sensor to cowl. Also check harness from cowl to PCM. If fault is indicated, isolate fault and repair as necessary. Clear continuous memory, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If no fault is found, go to step 92).
8. 92) Inspect PCM & Wiring Harness Connectors Turn ignition off. Disconnect PCM 60-pin connector. Inspect both connector and connector terminals for damage. If connectors and terminals are damaged, repair as necessary and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If connectors and terminals are okay and fault cannot be duplicated at this time, see appropriate TESTS W/O CODES article in ENGINE PERFORMANCE: For 1993 Crown Victoria, see «TESTS W/O CODES - EEC-IV»(ref-22791) For 1993 E-150 5.0L SFI, see «TESTS W/O CODES»(ref-22823) For 1993 Grand Marquis, see «TESTS W/O CODES - EEC-IV»(ref-22791) For 1993 Mark VIII, see «TESTS W/O CODES - EEC-IV»(ref-22791) For 1993 Town Car, see «TESTS W/O CODES - EEC-IV»(ref-22791) 1994 Cougar/T-Bird 3.8L «TESTS W/O CODES - EEC-IV (3.8L)»(ref-22899) 1994 Cougar/T-Bird 4.6L «TESTS W/O CODES - EEC-V (4.6L)»(ref-22936) For 1994 Crown Victoria «TESTS W/O CODES - EEC-IV (4.6L)»(/ford/crown-victoria/i-1992-1997/remont/testing-diagnostics/#engine-controls-tests-wo-codes-eec-iv-46l) For 1994 E-150 5.0L SFI, see «TESTS W/O CODES»(ref-22980) For 1994 F-150 5.0L SFI, see «TESTS W/O CODES»(ref-22976) For 1994 Grand Marquis «TESTS W/O CODES - EEC-IV (4.6L)»(/ford/crown-victoria/i-1992-1997/remont/testing-diagnostics/#engine-controls-tests-wo-codes-eec-iv-46l) For 1994 Mark VIII, see «TESTS W/O CODES - EEC-IV (4.6L)»(/ford/crown-victoria/i-1992-1997/remont/testing-diagnostics/#engine-controls-tests-wo-codes-eec-iv-46l) For 1994 Mustang 3.8L, see «TESTS W/O CODES - EEC-V (3.8L)»(ref-22901) For 1994 Mustang 5.0L see «TESTS W/O CODES - EEC-IV (5.0L)»(ref-22934) For 1994 Town Car, see «TESTS W/O CODES - EEC-IV (4.6L)»(/ford/crown-victoria/i-1992-1997/remont/testing-diagnostics/#engine-controls-tests-wo-codes-eec-iv-46l) NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 92) to step 100). No test procedures have been omitted.
9. 100) Continuous Memory Code 338 A Continuous Memory Code 338 indicates cooling system has not reached normal operating temperature. Possible causes for this fault are: Thermostat stuck open. Coolant outlet gasket leak. Water pump gasket leak. Repair cooling system as necessary. Clear continuous memory, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
10. 101) Continuous Memory Code 339 A Continuous Memory Code 339 indicates cooling system has overheated. Possible causes for this fault are: Coolant level low. Thermostat stuck closed. Coolant system clogged. Water pump damaged or worn. Radiator cap damaged or worn. Cooling fan damaged or worn. Repair cooling system as necessary. Clear continuous memory, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .

Perform this test when directed by QUICK TEST. This CIRCUIT TEST is intended to diagnose the following

1. MAF sensor.
2. Wiring harness circuits (VPWR, PWR GND, MAF and MAF RTN).
3. Powertrain Control Module (PCM).

To prevent replacement of good components, be aware the following non-EEC related areas may be cause of problem

1. Air cleaner element.
2. Inlet air duct.
3. Throttle body.

Code 159, retrieved during KOEO SELF-TEST, indicates voltage exceeded .7-volt test range. Code 159, retrieved during KOER SELF-TEST, indicates voltage is not within .2-1.5 volts operating range. Possible causes are faulty MAF sensor or PCM.

Mass Airflow (MAF) Sensor Circuits & Connector Terminals. Scheme 34

TEST PIN WIRE COLOR IDENTIFICATION

MAF SIGNAL VOLTAGE (1)

Note. Code 159 may be caused by use of a garage exhaust ventilation system. Ensure vehicle is vented to outside atmosphere before repeating QUICK TEST.

1. 1) Code 159: Check VPWR Circuit Voltage Code 159 indicates MAF sensor was out of range during KOEO or KOER SELF-TEST. Possible causes for this fault are: Air leak before or after MAF sensor. Faulty MAF sensor. Faulty IAC solenoid. Open or grounded wiring harness. Faulty PCM. Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If Code 412 is present, go to CIRCUIT TEST KE, step 1), and/or if Code 411 is present, go to CIRCUIT TEST KE, step 15) in appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. See menu below. If Code 411 or 412 is not present, go to step 2).
2. 2) VPWR Circuit Voltage Check Turn ignition off. Disconnect MAF sensor connector. Set DVOM on 20-volt scale. Turn ignition on. Measure voltage between VPWR terminal at MAF sensor wiring harness connector and negative battery terminal. If voltage is less than 10.5 volts, repair open in VPWR circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage is 10.5 volts or more, go to step 3) .
3. 3) Check MAF Sensor Ground Turn ignition on. With MAF sensor disconnected, measure voltage between VPWR terminal and PWR GND terminal at MAF sensor connector. If voltage is less than 10.5 volts, repair open PWR GND circuit. Connect MAF sensor, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage is 10.5 volts or more, go to step 13). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 10). No test procedures have been omitted.
4. 10) Continuous Memory Code 157: Check For Intermittent Sensor Failure Continuous Memory Code 157 indicates MAF signal was less than 0.4 volt sometime during last 80 warm-up cycles. Possible causes for this fault are: Open MAF circuit. MAF circuit shorted to ground. Faulty MAF sensor. MAF sensor disconnected. Start engine and allow to idle for 5-10 minutes. Perform «KOEO SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__koeo-self-test) . If Code 157 is present, go to step 13). If Code 157 is not present, go to next step.
5. 11) Monitor MAF Circuit Under Simulated Road Shock Turn ignition off. Disconnect and inspect 60-pin connector at PCM. Service if necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM connected. Connect DVOM between MAF test pin and MAF RTN test pin. See appropriate table at beginning of this CIRCUIT TEST. DVOM should read about 0.4 volt. Start engine and allow to idle. Lightly tap on MAF sensor and wiggle wiring harness to simulate road conditions. If sudden change in DVOM reading occurs, fault is indicated. If fault is indicated, replace MAF sensor and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If no fault is indicated, leave DVOM connected and go to next step.
6. 12) Check Wiring Harness For Open Or Short Circuit Turn ignition on. Shake and bend small sections of wiring harness starting at MAF sensor and working toward dash panel. Shake and bend small sections of wiring harness starting at dash panel and working toward PCM. If fault is indicated, isolate and repair as necessary. If fault is not indicated, problem is intermittent and cannot be duplicated at this time.
7. 13) Codes 157 Or 129: Check For Air Leak At MAF Sensor Check for broken or loose air outlet tube clamps at throttle body and air cleaner assembly. Repair or replace as necessary. If no faults are found, go to next step.
8. 14) Check Continuity Of MAF & VPWR Circuit Turn ignition off. Disconnect MAF sensor and PCM wiring harness connector. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between MAF terminal of MAF sensor wiring harness connector and test pins No. 37 and 57. Measure resistance between MAF terminal of MAF sensor wiring harness connector and test pin No. 50 (Sequential Fuel Injected engines) or test pin No. 14 (except Sequential Fuel Injected engines). If resistance is more than 5 ohms, repair open circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If resistance is 5 ohms or more, go to next step.
9. 15) Check MAF Signal For Short To Ground Turn ignition off. Ensure MAF sensor and PCM wiring harness are disconnected. Measure resistance between test pin No. 50 and test pins No. 9, 40 and 60 (Sequential Fuel Injected engines) or between test pin No. 14 and test pins No. 15, 40 and 60 (except Sequential Fuel Injected engines). If resistance is less than 10 k/ohms, repair short circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If resistance is 10 k/ohms or more, go to next step.
10. 16) Check Power & Ground Circuit Continuity Turn ignition off. Ensure MAP sensor and PCM wiring harness connector are disconnected. Measure resistance between PWR GND terminal at MAF sensor wiring harness connector and negative battery terminal. If resistance is 10 k/ohms or more, repair open PWR GND circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If resistance is less than 10 k/ohms, go to next step.
11. 17) Check Continuity Of MAF RTN Circuit Ensure ignition is turned off. Measure resistance between MAF RTN terminal of MAF sensor wiring harness connector and test pin No. 9 (Sequential Fuel Injected engines) or test pin No. 15 (except Sequential Fuel Injected engines). If resistance is more than 5 ohms, repair open circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If resistance is 5 ohms or more, go to next step.
12. 18) Check MAF Circuit For Short To Ground Turn ignition off. Ensure MAF sensor is disconnected. Connect PCM to breakout box. Measure resistance between test pin No. 50 and test pins No. 9, 40 and 60. If resistance is less than 10 k/ohms, replace PCM and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If resistance is 10 k/ohms or more, go to next step.
13. 19) Check MAF Circuit Output Turn ignition off. Connect MAF sensor wiring harness connector. Start engine. Measure resistance between test pin No. 50 and negative battery terminal. If voltage is .36-1.50 volts, go to next step. If voltage is not .36-1.50 volts, replace MAF sensor and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
14. 20) Check MAF Circuit Output With engine running, measure resistance between test pin No. 9 and test pin No. 50. If voltage is .36-1.50 volts, replace PCM and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage is not .36-1.50 volts, replace MAF sensor and repeat QUICK TEST.
15. 21) Code 158 Turn ignition off. Disconnect MAF sensor wiring harness connector. Start engine, and allow it to idle for one minute. Turn ignition off. Repeat «KOEO SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__koeo-self-test) . If Code 157 is present, replace MAF sensor and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If Code 157 is not present, go to step 22).
16. 22) Check MAF Circuit For Short To VPWR Turn ignition off. Disconnect PCM 60-pin connector, and inspect it for damaged or corroded terminals. Service if necessary. Measure resistance between MAF and VPWR terminals at MAF sensor wiring harness connector. If resistance is 10 k/ohms or more, replace PCM and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If resistance is less than 10 k/ohms, repair short circuit and repeat QUICK TEST.

Perform this test only when directed by QUICK TEST. This test is intended to diagnose the following

1. TP sensor.
2. Wiring harness circuits (TP, SIG RTN and VREF).
3. Powertrain Control Module (PCM).

Normal range of throttle angle measurement for TP sensor is 0-85 degrees. To pass QUICK TEST procedure, range of throttle rotation (in degrees) must be within 3 percent of specification. (Scheme 35)

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

1. Idle speed.
2. Binding throttle shaft or linkage.
3. Choke cam adjustment (if equipped).
4. TP sensor not seated.

Identifying TP Sensor Circuits & Connector Terminals. Scheme 35

TEST PIN WIRE COLOR IDENTIFICATION

TP Sensor Specification Chart. Scheme 36

1. 1) KOER Code 121: Check For Other Codes KOER Code 121 indicates TP sensor rotational setting may be out of self-test range. Possible causes for this fault are: Binding throttle linkage. TP sensor not seated correctly. Faulty TP sensor. Faulty Powertrain Control Module (PCM). Perform «KOER SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). Check for Code 327. If either of these codes are present with Code 121, service Code 327 and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If these codes are not present, go to step 2).
2. 2) Code 121: Check For Binding Throttle Plate Inspect throttle body for binding. If throttle body is binding, check for binding throttle or cruise control linkage, vacuum line or harness interference, etc. Repair as necessary, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If no mechanical problem is found, go to step 3).
3. 3) Code 123: Attempt To Generate Code 122 Code 123 indicates TP sensor signal is greater than self-test maximum value. Possible causes for this fault are: TP sensor not seated properly. Faulty TP sensor. Short circuit to power. Faulty PCM. Turn ignition off. Disconnect TP sensor wiring harness connector. Inspect and repair connector pins if damaged. Repeat «KOEO SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__koeo-self-test). Ignore all other codes at this time. If Code 63/122 is not displayed, go to step 5). If Code 122 is displayed, go to step 4).
4. 4) Check VREF Circuit Voltage Turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If reading is 4-6 volts, replace TP sensor and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If reading is not 4-6 volts, reconnect sensor and go to «CIRCUIT TEST CA»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv).
5. 5) Check TP Circuit For Short To Power Turn ignition off. Leave TP sensor disconnected. Disconnect PCM 60-pin connector. Inspect it for damage and repair as necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between test pin No. 47 and test pins No. 26 and 57. If either resistance is less than 10 k/ohms, repair short circuit in wiring harness and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If both resistances are 10 k/ohms or more, replace PCM and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 10). No test procedures have been omitted.
6. 10) Code 122: Attempt To Generate Code 123 Or 121 Code 122 indicates TP signal is less than minimum self-test value. (Scheme 37) Possible causes for this fault are: TP sensor not seated correctly. Faulty TP sensor. Open circuit in wiring harness. Grounded circuit in wiring harness. Faulty PCM. Turn ignition off, and wait 10 seconds. Disconnect TP sensor from harness. Install a jumper wire between VREF and TP terminals at TP sensor wiring harness connector. Perform «KOEO SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__koeo-self-test). If no codes are generated, remove jumper wire and go to step 13). If Codes 123 and 121 are not present, remove jumper wire and go to step 11). If either Code 123 or 121 is displayed, replace TP sensor and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv).
7. 11) Check VREF Circuit Voltage Turn ignition on. Measure voltage between VREF and SIG RTN terminals at TP sensor wiring harness connector. If voltage is not 4-6 volts, reconnect all components and go to «CIRCUIT TEST CA»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If voltage is 4-6 volts, go to step 12).
8. 12) Check TP Sensor Circuit Continuity Turn ignition off. Leave TP sensor disconnected. Disconnect PCM 60-pin connector. Inspect connector and repair if necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between TP terminal at TP sensor wiring harness connector and test pin No. 47. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If resistance is less than 5 ohms, go to step 13).
9. 13) Check TP Circuit For Shorts To Ground Turn ignition off. Leave TP sensor disconnected. Ensure both 4EAT module wiring harness connectors are disconnected (if applicable). Disconnect PCM 60-pin connector. Inspect wiring, and repair as necessary. With breakout box installed and PCM disconnected, measure resistance between test pin No. 47 and test pins No. 40, 46 and 60. If any reading is less than 10 k/ohms, repair short circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If all readings are 10 k/ohms or more, replace PCM and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 20). No test procedures have been omitted.
10. 20) Code 167: Repeat Dynamic Response Test KOER Code 167 indicates TP sensor did not exceed 25% rotation during dynamic response portion of «KOER SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). A complete Wide Open Throttle (WOT) must be performed during dynamic response portion of test. Perform «KOER SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). Ensure WOT is completed during dynamic response portion of test. If Code 167 is still present, go to step 21). If code is not present, system is unable to duplicate Code 167 at this time. Service any other KOER codes. If no other service codes are present, testing is complete.
11. 21) Check TP Sensor Movement During Dynamic Response Test Turn ignition off. Disconnect PCM 60-pin connector. Inspect wiring, and repair as necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM connected. Set DVOM on 20-volt scale. Connect DVOM between test pins No. 46 and 47 at breakout box. Perform «KOER SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) and ensure proper WOT is completed during dynamic response test. If DVOM reading exceeds 3.5 volts during dynamic response test, replace PCM and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If reading does not exceed 3.5 volts, ensure TP sensor is correctly installed and adjusted. If TP sensor is correctly installed and adjusted, replace TP sensor. Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 21) to step 90). No test procedures have been omitted.
12. 90) Continuous Memory Code 123 This test monitors TP sensor under simulated road conditions. Enter wiggle test. See CONTINUOUS MONITOR MODE (WIGGLE TEST) under «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). Connect DVOM or diagnostic tester to STO terminal of self-test connector. While slowly opening throttle to WOT, observe DVOM or diagnostic tester for indication of fault. Slowly bring throttle to closed position. Lightly tap TP sensor and wiggle harness connector. This test checks for open or short in TP sensor and wiring harness. If no fault is indicated, go to step 92). If fault is indicated, go to step 91).
13. 91) Measure TP Circuit Voltage While Exercising TP Sensor Turn ignition off, and wait 10 seconds. Disconnect PCM 60-pin connector. Inspect for damage and repair if necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM connected. Stay in wiggle test (as in previous step). Connect DVOM between test pins No. 47 and 46. Set DVOM on 20-volt scale. With ignition on and engine off, observe DVOM and repeat step 90). If fault occurs at less than 4.25 volts, inspect TP sensor connectors and terminals. If connectors and terminals are okay, replace TP sensor, clear codes and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If fault does not occur at less than 4.25 volts, TP sensor over-travel may have caused Continuous Memory Code 123. TP sensor is okay. Go to step 92) to check wiring harness.
14. 92) Check EEC-IV Wiring Harness While in wiggle test, bend and shake small sections of EEC-IV harness from TP sensor wiring harness connector to firewall and from firewall to PCM while observing analog voltmeter or scan tester. If fault is indicated, isolate fault in wiring and repair as necessary. Clear codes, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If no fault is indicated, go to step 93).
15. 93) Check PCM & Harness Connectors Turn ignition off, and wait 10 seconds. Disconnect PCM 60-pin connector from breakout box. Inspect connectors and terminals for damage, and repair as necessary. Clear codes from PCM memory, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If connectors and terminals are okay, fault cannot be duplicated at this time. Continuous Memory Code 123 testing is complete.
16. 94) Continuous Memory Code 122 Enter wiggle test. See CONTINUOUS MONITOR MODE (WIGGLE TEST) under «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). Connect DVOM or diagnostic tester to STO terminal of self-test connector. Observe DVOM or diagnostic tester for indication of fault while performing the following: Slowly open throttle to WOT. Slowly bring throttle to closed position. Lightly tap TP sensor and wiggle connector. If fault is indicated, disconnect TP sensor. Inspect connectors and terminals. If connectors and terminals are okay, replace TP sensor. Clear codes from PCM memory, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If no fault is indicated, go to next step.
17. 95) Check EEC-IV Wiring Harness Stay in wiggle test (as in previous step). Bend, wiggle and shake small sections of EEC-IV harness from TP sensor wiring harness connector to firewall and from firewall to PCM while observing analog voltmeter or scan tester. If fault is indicated, isolate fault in wiring and repair as necessary. Clear codes from PCM memory, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If no fault is indicated, go to step 96).
18. 96) Check PCM & Harness Connectors Turn ignition off. Inspect PCM 60-pin connector and terminals for damage. Repair connector terminals if necessary. Clear codes from PCM memory, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv). If connectors and terminals are okay, fault cannot be duplicated at this time. Continuous Memory Code 122 testing is complete.

Perform this test when directed by QUICK TEST . This CIRCUIT TEST is intended to diagnose

1. Vehicle Speed Sensor (VSS).
2. VSS wiring harness circuits.
3. Powertrain Control Module (PCM).

Vehicle Speed Sensor Circuit. Scheme 37

TEST PIN WIRE COLOR IDENTIFICATION

Preliminary Instructions

Record and clear continuous memory codes. Warm engine to normal operating temperature. Place gear selector in Drive position. Accelerate hard to 35 MPH and coast down to a stop. Shut off engine. Perform KOEO SELF-TEST . Repeat step at least 2 more times. Go to step 1).

Perform this test when directed by QUICK TEST . This test is intended to diagnose a faulty BOO switch circuit or PCM. To prevent replacement of good components, be aware following non-EEC related areas may be at fault

1. Brakelight bulb.
2. Brakelight switch or brakelight fuse.

BOO Switch Circuit. Scheme 38

TEST PIN WIRE COLOR IDENTIFICATION

1. 1) Code 536: Verify Brake Pedal Was Depressed Code 536 indicates that when brake pedal is applied during KOER SELF-TEST, BOO signal did not cycle high and low. Possible causes for this fault are: Brake pedal not applied during self-test. Brake pedal applied during entire self-test. Open brakelight circuit. Short to ground or power. Faulty Powertrain Control Module (PCM). If brake was not applied during KOER SELF-TEST, repeat test. Depress and release brake pedal only once during test. If pedal was depressed, go to step 2).
2. 2) Check Operation Of Brakelights With ignition on, check operation of brakelights. If brakelights operate normally, go to step 3). If brakelights do not operate, go to step 4). If brakelights are always on, go to step 5).
3. 3) Check For BOO Switch Circuit Cycling Turn ignition off. Wait 10 seconds. Disconnect PCM 60-pin connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure voltage between BOO test pin (No. 2) and test pin No. 40 while applying and releasing brake. If voltage cycles, replace PCM and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage does not cycle, repair open circuit in BOO switch circuit between PCM and BOO switch connection to brakelight circuit. Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
4. 4) Check For Power To Brake Switch Ensure related fuses and brakelight bulbs are in good condition. Turn ignition off. Disconnect brakelight switch (located on brake pedal). Measure voltage between BATT (+) input to brakelight switch and ground. If voltage is greater than 10 volts, check condition of brakelight switch. If brakelight switch is okay, repair open circuit between brakelight switch and brakelight ground. Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage is less than 10 volts, repair open BATT (+) circuit to brakelight switch and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
5. 5) Verify Brake Switch Is Not Always Closed Turn ignition off. Disconnect brakelight switch (located on brake pedal). Turn ignition on. If brakelights are still on, go to step 6). If brakelights are not on, verify correct installation of brakelight switch. If installation is okay, replace brakelight switch and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
6. 6) Check For Short To Power In PCM Turn ignition off. Disconnect PCM. Turn ignition on. Check brakelights. If brakelights are on, go to step 7). If brakelights are not on, replace PCM and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
7. 7) Check For Short To Power In Shift Lock Actuator Turn ignition off. Ensure PCM and brakelight switch are disconnected. Disconnect shift lock actuator, cruise control module and ABS module (if equipped). Turn ignition on. If brakelights are still on, repair short to power in BOO or stoplight circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If brakelights are not on, repair short circuit in shift lock actuator circuit, cruise control system circuit or ABS circuit. Repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 7) to step 90). No test procedures have been omitted.
8. 90) Code 536: Check For Proper Brakelight Switch Installation Continuous memory Code 536 indicates a BOO circuit failure. If BOO input does not cycle after a predetermined number of transitions from 0 mph to a specific speed, the BOO input is assumed to be damaged and continuous memory Code 536 is set. Possible causes of failure are: Incorrect brakelight switch installation. Open brakelight/BOO circuit. Brakelight/BOO circuit short. Damaged switch or ground circuit. If switch is correctly installed and in good condition, go to next step. If switch or harness is damaged, service as needed and clear continuous memory. Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
9. 91) Inspect Brakelight Ground Inspect brakelight ground connection and harness connector. Repair as needed. If connections are okay, go to next step.
10. 92) Inspect Brakelight/BOO Circuits For Shorts With KOEO and brake pedal released, perform wiggle test of brakelight/BOO circuit harness and connectors while observing brakelights. If brakelights illuminate, inspect and repair circuits as needed. If brakelights do not illuminate, go to next step.
11. 93) Inspect Brakelight Circuit Continuity With ignition off, depress brake pedal and hold. Perform wiggle test of brakelight circuits while observing brakelights. Lightly tap brakelight switch while observing brakelights. If brakelights intermittently go out, inspect and repair circuits as needed. If brakelights remain illuminated, go to next step.
12. 94) Inspect BOO Circuit Continuity With ignition off, ensure brake pedal is released. Disconnect PCM 60-pin connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between BOO test pin No. 2 and brakelight circuit at switch while performing wiggle test on harness and connector. If resistance intermittently increases above 5 ohms, inspect and repair open circuit. Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If resistance is within specification, go to next step for further diagnosis. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 94) to step 99). No test procedures have been omitted.
13. 99) Road Test Vehicle Purpose of this test is to identify faults by monitoring certain controlled parameters while trying to recreate a drive-ability or MIL symptom. To prepare for road test: Install fuel pressure gauge and if available, a MAP/BARO tester. Disconnect PCM 60-pin connector, install breakout box and reconnect PCM to breakout box. Connect "T" vacuum gauge into manifold vacuum line. Have DVOM, writing materials and appropriate schematics and pin voltage charts available. With ignition on and negative lead of DVOM connected to negative battery terminal, ensure following signals are correct: POWERS: KAPWR (pin No. 1) is greater than 10.5 volts, VPWR (pins No. 37 and 57) is greater than 10.5 volts and VREF (pin No. 26)is 4-6 volts. GROUNDS: PWR GND (pins No. 40 and 60), SIG RTN (pin No. 46) and IGN GND (pin No. 16) are 0.0-0.5 volt. OPTIONAL GROUNDS: HO2S GND (pin No. 49), CSE GND (pin No. 20) and MAF RTN (pin No. 9 or 15) are 0.0-0.5 volt.

Test lights and DVOM are useful during diagnosis. For example: a testlight could be connected at brakelight switch between battery and ground and another testlight between switch bulb circuit and ground. Testlight to battery circuit should always be illuminated and other testlight should only illuminate when brakelight is depressed.

With DVOM connected between test pin No. 2 and 40 at Breakout Box, check voltage. If voltage is between 6-7 volts with brake pedal released, possible open circuit between PCM and brakelight ground could exist.

The PSP switch, is a normally closed switch that opens as pressure in the power steering system increases.

Perform this test when instructed during QUICK TEST or if directed by other test procedures. Some vehicles may not have power steering, but PCM may be equipped with PSP switch software strategy. If a KOEO Code 519 is displayed, check if vehicle is equipped with power steering. If vehicle is not equipped with power steering, disregard Code 519. This test is only intended to diagnose

1. Power Steering Pressure (PSP) switch.
2. PSP and SIG RTN wiring harness circuits.
3. Powertrain Control Module (PCM).

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

1. Idle speed/throttle stop adjustment.
2. Binding throttle shaft/linkage.
3. Cruise control linkage.
4. Power steering hydraulic system.

Power Steering Pressure (PSP) Switch Circuit. Scheme 39

PSP SWITCH TEST PIN NUMBER IDENTIFICATION

Perform this test when instructed during QUICK TEST or if directed by other test procedures. To prevent replacement of good components, be aware the following non-EEC related areas may be at fault

1. Excessive blow-by.
2. PCV malfunction.
3. Vacuum leaks.
4. Incorrect fuel pressure.
5. Throttle binding.
6. Improper fuel pressure.
7. Idle air control solenoid.

This test is only intended to diagnose

1. MAP/BARO sensor.
2. Throttle Position Sensor (TPS).
3. Mass Airflow (MAF) sensor.
4. Intake Air Temperature (IAT) sensor.
5. Fuel injectors.

Perform this test when diagnosing a symptom. To prevent replacing good components, check the following non-EEC components and systems

1. Refrigerant charge.
2. Low ambient temperature (less than 45°F).

Note. Procedure starts with step 40) . No test procedures have been omitted.

1. 40) Code 539: Check A/C Input Code 539 indicates ACCS input to PCM was high during SELF-TEST. Turn ignition off. Disconnect 60-pin PCM connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 10 at breakout box and chassis ground. If voltage is 1.0 volt or more, repair short to power in A/C circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage is less than 1.0 volt, replace PCM and repeat QUICK TEST.

The MIL is turned on when PCM detects a fault in EEC circuit(s). The light will remain on as long as fault remains in system.

Perform this test only when instructed by QUICK TEST or if directed by CIRCUIT TEST QA . This test does not include procedure for models with electronic instrument panel. To prevent replacing good components, be aware that fuse, bulb or bulb socket may be cause of problem. This test is only intended to diagnose

1. STO/MIL circuit.
2. Faulty PCM.

Identifying Data Link Connector (DLC) Terminals. Scheme 40

TEST PIN WIRE COLOR IDENTIFICATION

1. 1) Malfunction Indicator Light (MIL) Always On Service all KOEO and Continuous Memory Codes before proceeding with this test. Turn ignition off. Disconnect 60-pin PCM connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between test pins No. 17 and 40 at breakout box. If resistance is more than 5 ohms, replace PCM and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If reading is 5 ohms or less, repair short between test pin No. 17 and Diagnostic Link Connector (DLC) terminal No. 17 or MIL. Reconnect all components, and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 1) to step 4). No test procedures have been omitted.
2. 4) Malfunction Indicator Light (MIL) Does Not Light Turn ignition on. Measure voltage between negative battery terminal and ground side of MIL fuse. If voltage is more than 10.5 volts, go to step 6). If voltage is 10.5 volts or less, go to step 5).
3. 5) Check For Voltage At Fuse Turn ignition on. Measure voltage from negative battery terminal to power side of MIL fuse. If voltage is more than 10.5 volts, replace fuse. Verify repair by turning ignition switch to RUN position. If voltage is 10.5 volts or less, repair open MIL/B+ circuit. Verify repair by turning ignition switch to RUN position.
4. 6) Check Voltage At B+ Circuit Turn ignition on. Measure voltage between B+ side of MIL bulb socket and negative battery terminal. If voltage is 10.5 volts or less, repair open in MIL circuit between fuse and bulb. Verify repair by turning ignition switch to RUN position. If voltage is more than 10.5 volts, go to step 7).
5. 7) Check MIL Bulb Response To Grounding Turn ignition off. Attach jumper wire between ground side of MIL bulb socket and chassis ground. Turn ignition on. If MIL light comes on, remove jumper wire, and go to step 8). If MIL light does not come on, remove jumper wire. Replace MIL bulb socket. Turn ignition on to verify correct MIL operation.
6. 8) Check Continuity Of MIL Circuit Turn ignition off. Disconnect 60-pin PCM connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between test pin No. 17 at breakout box and MIL wiring harness connector terminal. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open MIL circuit. Turn ignition on to verify correct MIL operation. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 8) to step 10). No test procedures have been omitted.
7. 10) MIL On Intermittently, Check For Intermittent Short From STO To Ground MIL comes on when a fault code is present. Service all fault codes before proceeding. If no codes are output, proceed with this test. Enter KOEO wiggle test. See CONTINUOUS MONITOR MODE (WIGGLE TEST) under «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . Check DVOM for indication of fault while performing wiggle test on harness in the following areas: From Diagnostic Link Connector (DLC) to dash panel. Dash panel to PCM. Dash panel to Malfunction Indicator Light (MIL). If a fault is indicated, repair short to ground and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If a fault is not indicated, fault cannot be duplicated at this time. Testing is complete. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 15). No test procedures have been omitted.
8. 15) MIL Flashes With Erratic Idle Symptoms indicate STI is grounded and PCM is performing self-test without tester installed. Turn ignition off. Disconnect 60-pin PCM connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between STI connector and engine ground. If resistance is 10 k/ohms or less, repair short circuit. Reconnect PCM, and turn ignition on to verify correct MIL operation. If resistance is more than 10 k/ohms, MIL circuit is okay. Verify symptom, and test for other rough idle symptoms. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 15) to step 20). No test procedures have been omitted.
9. 20) CHECK ENGINE Message Displayed Perform «KOEO SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__koeo-self-test) . If result is Code 111-10-111 (pass code), fault is in instrument cluster. If pass code is not displayed, service codes as necessary. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 20) to step 25). No test procedures have been omitted.
10. 25) Continuous Memory Code 529 Or 533: CHECK ENGINE Or CHECK DLC Message Displayed Codes 529 and 533 indicate circuit fault has occurred on Data Link Connector (DLC). These codes can occur alone or with another code. Fault will occur under following conditions: Code 529 indicates PCM or DLC circuit failure. Code 533 indicates DLC to electronic instrument cluster circuit failure. If vehicle does not start, go to step 1). If vehicle starts, clear continuous memory codes. Wait 5 minutes, and repeat «KOEO SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__koeo-self-test) . If result is pass code (Code 111-10-111), fault is in instrument cluster. If pass code is not displayed, service codes as necessary.

Aftermarket devices, such as alarm system, may cause SELF-TEST to abort if wiring is connected to certain EEC components. If a device is installed, disconnect it completely from EEC system. Before continuing with this circuit test, restore EEC circuits to original state and repeat QUICK TEST .

Perform this test when directed by QUICK TEST or other test procedures. This test is intended to diagnose

1. Powertrain Control Module (PCM).
2. EEC power relay.
3. Constant Control Relay Module (CCRM).
4. Wiring harness circuits (HO2S, SIG RTN, STO, STI, VPWR and VREF).

No Codes/Codes Not Listed Circuits. Scheme 41

TEST PIN WIRE COLOR IDENTIFICATION

Perform this test only when directed by QUICK TEST . This test is intended to diagnose

1. Powertrain Control Module (PCM).
2. Wiring harness circuits (TCIL, TCS and TCSM).

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

1. Basic engine condition (valves, vacuum leaks, valve timing, etc.).
2. Charging system.
3. Transmission (fluid, friction elements and cooling).

TEST PIN NO. 41 (TCS) WIRE COLOR IDENTIFICATION

TEST PIN NO. 14 OR 55 (TCIL) WIRE COLOR IDENTIFICATION

TEST PIN NO. 37 OR 57 (VPWR) WIRE COLOR IDENTIFICATION

Note. A break in step numbering sequence occurs at this point. Procedure starts at step 2). No test procedures have been omitted.

1. 2) Code 632 Or 653 Code 632 or 653 indicates that the TCS was not cycled between engine ID Code and WOT check during KOER SELF-TEST. Possible causes for this fault are: Faulty TCS or switch was not cycled during SELF-TEST. Shorted wiring harness. Faulty Powertrain Control Module (PCM). Open in wiring harness or fuse. If TCS cycled during KOER SELF-TEST, go to step 4). If TCS did not cycle during KOER SELF-TEST, repeat «KOER SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) while cycling TCS.
2. 3) Code 623 or 631 Code 623 or 631 indicates transmission control indicator light circuit fault during «KOEO SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv__koeo-self-test) . Possible causes for this fault are: Burned out bulb. Open or shorted wiring harness. If TCS cycled during KOEO SELF-TEST, go to step 5). If TCS did not cycle during KOEO SELF-TEST, repeat «KOER SELF-TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) while cycling TCS.
3. 4) Check TCS Circuit Turn ignition off. Disconnect 60-pin PCM connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 41 and test pin No 40 or 60 while cycling TCS several times. If voltage cycles replace PCM. Remove breakout box, reconnect all components, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage does not cycle, go to next step if diagnosing a trouble code. Go to step 7) if diagnosing a driveability symptom, or go to step 20) if vehicle is a Mustang.
4. 5) Check Circuits For Short To Ground Turn ignition off. Leave PCM disconnected from breakout box. Disconnect TCS connector. Inspect connector for damage and repair as necessary. Measure resistance between test pin No. 41 and test pin 40 or 60. Also, measure resistance between test pin No. 55 (14 on 3.2L SHO) and test pin No. 40 or 60. If each reading is more than 10 k/ohms, go to next step for Code 623 or 631, or step 8) for Code 632 or 653. If any reading is 10 k/ohms or less, repair short circuit. Repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If code is still present, go to step 7).
5. 6) Check Power Through TCIL Circuit Turn ignition off. Leave PCM disconnected from breakout box. Measure voltage between test pin No. 55 (14 on 3.2L SHO) and test pin No. 40 or 60. If voltage is more than 10.5 volts, replace PCM. Remove breakout box, reconnect all components, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage is 10.5 volts or less, go to next step.
6. 7) Check Output Driver Voltage Signal Leave PCM disconnected from breakout box. Turn ignition on. Measure voltage between test pin No. 55 (14 on 3.2L SHO) and test pin No. 40 or 60. If voltage is 2 volts or more, go to next step. If voltage is less than 2 volts, check bulb and fuse. Replace as necessary. If bulb and fuse are okay, repair open circuit. Remove breakout box, reconnect all components, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
7. 8) Check TCS & TCIL Circuits Turn ignition off. Leave PCM disconnected from breakout box. Ensure TCS is disconnected. Measure resistance of Purple/Orange wire between KEY POWER terminal of fuse No. 1 at instrument panel fuse block and TCS wiring harness connector. Also, measure resistance between test pin No. 41 at breakout box and Purple/Orange wire at TCS wiring harness connector. If any reading is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If each reading is less than 5 ohms, go to next step.
8. 9) Check For Short To Power Turn ignition off. Leave PCM disconnected from breakout box. Ensure TCS is disconnected. Measure resistance between test pin No. 41 and test pin 37 or 57. Also, measure resistance between test pin No. 55 (14 on 3.2L SHO) and test pin No. 37 or 57. If each reading is more than 10 k/ohms, replace TCS switch. Remove breakout box, reconnect all components, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If any reading is 10 k/ohms or less, repair short circuit. Remove breakout box, reconnect all components, and repeat QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 9) to step 20). No test procedures have been omitted. Steps 20-27 are for Mustang only.
9. 20) Check Transmission Control Switch Module (TCSM) Turn ignition off. Leave PCM disconnected from breakout box. Remove TCSM to access wiring harness connector. TCSM is located behind right side of instrument panel. Turn ignition on. Measure voltage between Orange/Black wire and Black/White wire of TCSM connector while cycling Transmission Control Switch (TCS) several times. If voltage does not cycle, go to next step. If voltage cycles, repair open circuit between TCSM connector and PCM. If voltage cycles but Transmission Control Indicator Light (TCIL) does not turn off and on, go to step 25). If voltage does not cycle, go to next step.
10. 21) Check TCSM Wiring Turn ignition off. Leave PCM disconnected from breakout box. Leave TCSM connected. Turn ignition on. Measure voltage between Red/Light Green wire and ground. If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open circuit between ignition switch and TCSM connector. Remove breakout box, reconnect all components, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
11. 22) Check TCSM Input From TCS Ensure ignition is on and PCM is disconnected from breakout box. Measure voltage between Tan/White wire and Black/White wire of TCSM connector while cycling TCS several times. If voltage cycles, replace TCSM. Remove breakout box, reconnect all components, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If voltage does not cycle, check TCS circuit. Repair as necessary.
12. 23) Transmission Control Indicator Light (TCIL) Always On Turn ignition on. Cycle Transmission Control Switch (TCS) and observe TCIL. If TCIL turns off and on, problem may be intermittent. Check all TCIL related wiring and repair as necessary. Recheck TCIL operation. If TCIL does not turn off and on, go to next step.
13. 24) Check Transmission Control Switch Module (TCSM) For Short Circuit Turn ignition off. Disconnect TCSM connector. TCSM is located behind right side of instrument panel. Turn ignition on. If TCIL is still on, repair short to ground in White/Light Green wire between TCIL and TCSM. Remove breakout box, reconnect all components, and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If TCIL is off, replace TCSM. Remove breakout box, reconnect all components, and repeat QUICK TEST.
14. 25) Transmission Control Indicator Light (TCIL) Inoperative Road test vehicle to ensure overdrive is functioning correctly. If overdrive is functioning correctly, repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If Code 631 is present, return to step 3). If Code 631 is not present, go to next step.
15. 26) Check Voltage At Fuse Panel Turn ignition on. Remove and inspect fuse No. 18 at instrument panel fuse block. If fuse is blown, replace fuse and recheck TCIL operation. If fuse is okay, go to next step.
16. 27) Check Wiring To TCSM Turn ignition off. Disconnect TCSM connector. TCSM is located behind right side of instrument panel. Connect one end of a jumper wire to ground and connector other end of jumper to White/Light Green wire at TCSM connector. Turn ignition on. If TCIL is on, problem may be intermittent. Check all TCIL related wiring and repair as necessary. Recheck TCIL operation. If TCIL light is off, check TCIL bulb. Replace bulb as necessary and recheck TCIL operation. If bulb is okay, repair open circuit between fuse block and TCSM connector. Recheck TCIL operation.

Perform this test only when directed by QUICK TEST . To prevent replacing good components, be aware the following non-EEC areas may be at fault

1. Engine condition (compression, cam timing, valves, etc.).
2. Charging system or battery.
3. Transmission linkage, internal components or cooling.

This test is not intended to diagnose transmission. This test is intended to diagnose

1. Wiring harness circuits TCC, EPC, SS1, SS2, SIG RTN, EPC PWR and VPWR.
2. Faulty Powertrain Control Module (PCM).

CIRCUIT TEST TC ACRONYMS

AODE/AODE-W SERVICE CODE IDENTIFICATION

Note. A break in step numbering sequence occurs at this point. Procedure skips to step 10). No test procedures have been omitted.

1. 10) Check VPWR To Solenoid Ensure ignition is off. Disconnect transmission harness connector. With KOEO, measure voltage between VPWR, EPC PWR circuit at transmission harness connector and ground. If voltage is more than 10.5 volts, go to next step. If voltage is not within specification, repair open circuit in harness. Connect all components and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) .
2. 11) Check Solenoid Signal & VPWR Circuit Continuity Turn ignition off. Disconnect 60-pin PCM connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between VPWR/EPC PWR terminal at transmission wiring harness connector breakout box test pins No. 37 and 57. Measure resistance between test pin No. 38 at breakout box and EPC terminal at transmission wiring harness connector. If resistance is 5 ohms or more, repair open circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If resistance is less than 5 ohms, go to step 12).
3. 12) Check Circuit For Short To Power Or Ground Leave ignition off and PCM disconnected. Leave transmission wiring harness connector disconnected. Measure and record resistance between test pins No. 37 and 57 and suspect solenoid test pin at breakout box. Measure and record resistance between test pins No. 40, 46 and 60 and suspect solenoid test pin at breakout box. If either resistance is less than 10 k/ohms, repair short circuit and repeat «QUICK TEST»(/ford/crown-victoria/i-1992-1997/remont/automatic-trans/#diagnosis-aode-aode-w-with-eec-iv) . If all resistances are 10 k/ohms or more, check solenoids. If solenoids are okay, replace PCM and repeat QUICK TEST.

Wiring Diagram (1993-94 Town Car). Scheme 42

Wiring Diagram (1993-94 Crown Victoria & Grand Marquis). Scheme 43

Wiring Diagram (1993-94 Mark VIII). Scheme 44

Wiring Diagram (1994 Cougar 3.8L SFI & Thunderbird 3.8L SFI). Scheme 45

Wiring Diagram (1994 Thunderbird 3.8L SC). Scheme 46

Wiring Diagram (1994 Mustang 5.0L). Scheme 47

Wiring Diagram (1993-94 E-150 5.0L). Scheme 48

Wiring Diagram (1993-94 F-150 5.0L). Scheme 49

See also:
• AUTO TRANS OVERHAUL - AODE & AODE-W
• COMPUTER RELEARN PROCEDURES
• TESTS W/O CODES - EEC-IV (4.6L)
• TRANSMISSION SERVICING - A/T
• FUEL PRESSURE SPECIFICATIONS
• SOLENOID OPERATION CHART
• CLEARING CODES
• KOEO SELF-TEST
• TRANSMISSION DRIVE CYCLE TEST