codes
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
That is false, all EEC-IV equiped vehicles, including the Aerostar, store codes, including codes that will not trigger a light. To check for stored codes, you test with the engine off, and to test for active codes, you test with the engine on.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
2 Parts
uwdtbuds,
who told you this falsehood...one of those minimum wage zombies at AZ with a code reader implanted in his rectum?
Right from the Ford Service manual
Special Notes:
l The Key On Engine Off and Engine Running Self-Tests detect faults that are present at the time of testing. Faults that occur only when the vehicle is operating or intermittent faults that have occurred in the last 80 warm-up cycles are detected during Continuous Self-Test, stored in the Continuous Memory and displayed during Key On Engine Off Self-Test.
l When directed to a Pinpoint Test always read the cover page(s) for special notes and look carefully at the Pinpoint Test Schematic.
l After service, rerun Quick Test to ensure that service was effective.
l It may be necessary to disconnect or disassemble harness connector assemblies to do some of the inspections. Pin locations should be noted before disassembly.
ey On Engine Off Self-Test
Special Notes:
l Continuous Memory Diagnostic Trouble Codes (DTC's) recorded in this step will be used for diagnosis after a PASS code 11 or 111 is received in both the Key On Engine Off and the Engine Running Self-Tests.
l Deviation from this procedure may cause the output of false DTC's.
l On all vehicles equipped with a 4.9L ENGINE, the clutch must be depressed during the Key On Engine Off Self-Test.
l On all vehicles equipped with a 7.3L DIESEL ENGINE, the throttle must be depressed (WOT) during the entire Key On Engine Off Self-Test.
How To Run The Key On Engine Off Self-Test
DO
l Verify that the vehicle has been properly prepared.
l Start engine and run until it's at operating temperature.
l Turn engine off and wait 10 seconds.
l Activate Self-Test.
-- STAR Tester: Latch the center button in the down position.
-- Analog VOM: Jumper STI to SIG RTN at the DLC and STI connectors.
-- Malfunction Indicator Lamp (MIL): Jumper STI to SIG RTN at the DLC and STI connectors. DTC's will be flashed on the Malfunction Indicator Lamp (MIL).
-- Transmission Control Indicator Lamp (TCIL) 7.3L Diesel only: Jumper STI to SIG RTN at the DLC and STI connectors. Service Codes will be flashed on the TCIL.
-- Message Center (Continental Applications Only). Refer to "Self-Test with Message Center".
-- Scan Tool: 1) Enter vehicle selection. 2) Enter KOEO Self-Test.
l Place ignition key in the ON position.
l For 7.3L Diesel vehicles only, depress the throttle.
l Record all Diagnostic Trouble Codes (DTC's) displayed.
DON'T
l Depress throttle during Key On Engine Off Self-Test on gasoline engine applications.
Engine Running Self-Test
Special Notes:
l On vehicles equipped with the Brake On/Off (BOO) circuit, the brake pedal MUST be depressed and released AFTER the ID code.
l On vehicles equipped with the Power Steering Pressure (PSP) switch, within 1 to 2 seconds after the ID code, the steering wheel must be turned at least one-half turn and released.
l On vehicles equipped with E4OD transmission, the Transmission Control Switch (TCS) must be cycled after the ID code.
l The Dynamic Response code is a single pulse (or a 10 code on the STAR Tester) that occurs 6-20 seconds after the engine running identification code. (See APPENDIX: DTC Output Format.)
l When/if the Dynamic Response code occurs, perform a brief wide open throttle.
How To Run Engine Running Self-Test
DO
l Deactivate Self-Test.
l Start and run engine at 2,000 rpm for two minutes. This action warms up the HO2S.
l Turn engine off, wait 10 seconds.
l Activate Self-Test.
l Start engine.
l After the ID code, depress and release the brake pedal if appropriate. See Special Note on previous page.
l After the ID code, within 1 to 2 seconds, turn the steering wheel at least one-half turn and then release it, if appropriate. See Special Note above.
l If a Dynamic Response Code occurs, perform a brief wide-open throttle (WOT).
l Record all Diagnostic Trouble Codes (DTC's) displayed.
DON'T
l Depress the throttle unless a Dynamic Response code is displayed.
who told you this falsehood...one of those minimum wage zombies at AZ with a code reader implanted in his rectum?
Right from the Ford Service manual
Special Notes:
l The Key On Engine Off and Engine Running Self-Tests detect faults that are present at the time of testing. Faults that occur only when the vehicle is operating or intermittent faults that have occurred in the last 80 warm-up cycles are detected during Continuous Self-Test, stored in the Continuous Memory and displayed during Key On Engine Off Self-Test.
l When directed to a Pinpoint Test always read the cover page(s) for special notes and look carefully at the Pinpoint Test Schematic.
l After service, rerun Quick Test to ensure that service was effective.
l It may be necessary to disconnect or disassemble harness connector assemblies to do some of the inspections. Pin locations should be noted before disassembly.
ey On Engine Off Self-Test
Special Notes:
l Continuous Memory Diagnostic Trouble Codes (DTC's) recorded in this step will be used for diagnosis after a PASS code 11 or 111 is received in both the Key On Engine Off and the Engine Running Self-Tests.
l Deviation from this procedure may cause the output of false DTC's.
l On all vehicles equipped with a 4.9L ENGINE, the clutch must be depressed during the Key On Engine Off Self-Test.
l On all vehicles equipped with a 7.3L DIESEL ENGINE, the throttle must be depressed (WOT) during the entire Key On Engine Off Self-Test.
How To Run The Key On Engine Off Self-Test
DO
l Verify that the vehicle has been properly prepared.
l Start engine and run until it's at operating temperature.
l Turn engine off and wait 10 seconds.
l Activate Self-Test.
-- STAR Tester: Latch the center button in the down position.
-- Analog VOM: Jumper STI to SIG RTN at the DLC and STI connectors.
-- Malfunction Indicator Lamp (MIL): Jumper STI to SIG RTN at the DLC and STI connectors. DTC's will be flashed on the Malfunction Indicator Lamp (MIL).
-- Transmission Control Indicator Lamp (TCIL) 7.3L Diesel only: Jumper STI to SIG RTN at the DLC and STI connectors. Service Codes will be flashed on the TCIL.
-- Message Center (Continental Applications Only). Refer to "Self-Test with Message Center".
-- Scan Tool: 1) Enter vehicle selection. 2) Enter KOEO Self-Test.
l Place ignition key in the ON position.
l For 7.3L Diesel vehicles only, depress the throttle.
l Record all Diagnostic Trouble Codes (DTC's) displayed.
DON'T
l Depress throttle during Key On Engine Off Self-Test on gasoline engine applications.
Engine Running Self-Test
Special Notes:
l On vehicles equipped with the Brake On/Off (BOO) circuit, the brake pedal MUST be depressed and released AFTER the ID code.
l On vehicles equipped with the Power Steering Pressure (PSP) switch, within 1 to 2 seconds after the ID code, the steering wheel must be turned at least one-half turn and released.
l On vehicles equipped with E4OD transmission, the Transmission Control Switch (TCS) must be cycled after the ID code.
l The Dynamic Response code is a single pulse (or a 10 code on the STAR Tester) that occurs 6-20 seconds after the engine running identification code. (See APPENDIX: DTC Output Format.)
l When/if the Dynamic Response code occurs, perform a brief wide open throttle.
How To Run Engine Running Self-Test
DO
l Deactivate Self-Test.
l Start and run engine at 2,000 rpm for two minutes. This action warms up the HO2S.
l Turn engine off, wait 10 seconds.
l Activate Self-Test.
l Start engine.
l After the ID code, depress and release the brake pedal if appropriate. See Special Note on previous page.
l After the ID code, within 1 to 2 seconds, turn the steering wheel at least one-half turn and then release it, if appropriate. See Special Note above.
l If a Dynamic Response Code occurs, perform a brief wide-open throttle (WOT).
l Record all Diagnostic Trouble Codes (DTC's) displayed.
DON'T
l Depress the throttle unless a Dynamic Response code is displayed.
Last edited by 96_4wdr; Dec 8, 2006 at 04:47 PM.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
Self-Test Description
The Self-Test is divided into three specialized tests: Key On Engine Off Self-Test, Engine Running Self-Test, and Continuous Self-Test. The Self-Test is not a conclusive test by itself, but is used as a part of the functional Quick-Test diagnostic procedure. The PCM stores the Self-Test program in its permanent memory. When activated, it checks the EEC system by testing its memory integrity and processing capability, and verifies that various sensors and actuators are connected and operating properly.
The Key On Engine Off and Engine Running Self-Tests are functional tests which only detect faults present at the time of the Self-Test. Continuous Self-Test is performed during normal vehicle operation and stores any fault information in Keep Alive Memory (KAM) for retrieval at a later time.
Key On Engine Off Self-Test
At this time, a test of the EEC system is conducted with power applied and engine at rest.
To detect errors during Key On Engine Off Self-Test, the fault must be present at the time of testing.
Separator Pulse
A single 1/2 second separator pulse is issued 6-9 seconds after the last Key On Engine Off DTC. Then, 6-9 seconds after the single 1/2 second separator pulse, the Continuous Memory DTC's will be issued.
Continuous Memory Diagnostic Trouble Codes (DTC's)
Continuous Memory DTC's are issued as a result of information stored during Continuous Self-Test, while the vehicle was in normal operation. These DTC's are displayed only during Key On Engine Off Self-Test and after the separator pulse. Intermittent faults that have not occurred in the last 80 warm-up cycles (40 cycles on some applications) are erased from Continuous Memory and will not produce a Continuous Memory DTC.
NOTE:
The separator pulse and Continuous Memory DTC's follow Key On Engine Off DTC's ONLY.
Engine Running Self-Test
At this time, a test of the EEC system is conducted with the engine running. The sensors are checked under actual operating conditions and at normal operating temperatures. The actuators are exercised and checked for expected results.
Engine Identification Codes (ID Codes)
Engine ID codes are issued at the beginning of the Engine Running Self-Test and are one-digit numbers represented by the number of pulses sent out. For gasoline engines, the engine ID code is equal to one-half the number of engine cylinders (i.e. 2 pulses = 4 cylinders). For the 7.3L Diesel engine, the ID code = 5. These codes are used to verify the proper PCM is installed and that the Self-Test has been entered.
Dynamic Response Check
The dynamic response check is used on some applications to verify operation of the TP, MAF, MAP and KS sensors during the brief Wide-Open Throttle (WOT) performed during the Engine Running Self-Test. The signal for the operator to perform the brief WOT is a single pulse or 10 code on the STAR Tester.
Power Steering Pressure (PSP) Switch Test
On vehicles equipped with Power Steering Pressure (PSP) switch, the steering wheel must be turned one-half turn and released AFTER the ID Code has been displayed. This tests the ability of the EEC system to detect a change of state in the PSP switch.
Brake On/Off Test
On vehicles equipped with Brake On/Off (BOO) input, the brake pedal MUST be depressed and released AFTER the ID Code has been displayed. This tests the ability of the EEC system to detect a change of state in the Brakelamp Switch.
Transmission Control Switch (TCS) Test
On vehicles equipped with TCS, the switch must be cycled after the ID code has been displayed. This tests the ability of the EEC system to detect a change of state in the TCS.
Adaptive Fuel Self-Test
Adaptive fuel logic is used in fuel injection systems primarily to account for normal variability in fuel system components. When, during steady state vehicle operation, the fuel system is detected to be "biased" rich or lean, Adaptive Fuel will make a corresponding shift in the fuel delivery calculations so an un-biased condition will exist. The adaptive fuel "shift" is stored in Keep Alive Memory (KAM), which is powered by the vehicle battery. This prevents Adaptive Fuel from being lost when the vehicle is turned off.
MAF/TP/Injector Pulsewidth In-Range Self-Test
The In-Range Self-Test was designed to detect in-range failures of the MAF/TP or fuel delivery systems. The PCM will use information from these three systems to generate three independent values. The three independent values will be continuously monitored and if one of the values differs significantly from the others during normal vehicle operation a Continuous Memory DTC 121, 124, 125, 184, 185, 186 or 187 will be displayed.
Code Output Format
The EEC system communicates service information through the Diagnostic Trouble Codes (DTC's). These DTC's are two-digit or three-digit numbers representing the results of Self-Test.
The DTC's are transmitted on the Self-Test Output (STO) circuit found in the Data Link Connector (DLC). They are in the form of timed pulses, and are read by the technician on a voltmeter, STAR tester, Malfunction Indicator Lamp (MIL), Transmission Control Indicator Lamp (TCIL) or on the Continental message center.
Diagnostic Trouble Code (DTC) Format
Key On Engine Off and Continuous Memory DTC's
Figure 4: Key On Engine Off and Continuous Memory DTC Format (2-digit DTC's shown, 3-digit DTC's Similar)
Diagnostic Trouble Code (DTC) Format
Engine Running DTC's
Figure 5: Engine Running DTC Format (2-digit DTC's Shown, 3-digit DTC's Similar)
Fast DTC's/Slow DTC's
Fast DTC's are issued prior to slow service DTC's. These DTC's contain the identical information as the slow DTC's, but are transmitted at 100 times the normal rate. These DTC's are interpreted by special equipment at the end of the assembly line by the Body and Assembly Division as well as the SUPER STAR II tester. After Fast DTC's have been output, Self-Test should not be exited (remove jumper, unlatch button, etc.) until all the Slow DTC's have been output. Doing so will erase any Continuous Memory DTC's.
Some meters in service detect these codes as a short burst of information (slight meter deflection).
Continuous Self-Test
The Continuous Memory DTC's are separated from the Key On Engine Off DTC's by a single separator pulse, Figure 6.
Figure 6: Continuous Memory DTC Format (2-digit DTC's Shown, 3-digit DTC's Similar)
During this mode of testing the PCM continuously monitors inputs for opens and shorts. The Continuous Memory DTC's must be retrieved within* 80 engine temperature warm up cycles. On the 81st or 41st Engine Temperature cycle, the DTC will be automatically erased. The Continuous Memory DTC's can also be erased by deactivating Self-Test while the DTC's are being outputted.
*40 engine temperature warm up cycles for some applications.
The Self-Test is divided into three specialized tests: Key On Engine Off Self-Test, Engine Running Self-Test, and Continuous Self-Test. The Self-Test is not a conclusive test by itself, but is used as a part of the functional Quick-Test diagnostic procedure. The PCM stores the Self-Test program in its permanent memory. When activated, it checks the EEC system by testing its memory integrity and processing capability, and verifies that various sensors and actuators are connected and operating properly.
The Key On Engine Off and Engine Running Self-Tests are functional tests which only detect faults present at the time of the Self-Test. Continuous Self-Test is performed during normal vehicle operation and stores any fault information in Keep Alive Memory (KAM) for retrieval at a later time.
Key On Engine Off Self-Test
At this time, a test of the EEC system is conducted with power applied and engine at rest.
To detect errors during Key On Engine Off Self-Test, the fault must be present at the time of testing.
Separator Pulse
A single 1/2 second separator pulse is issued 6-9 seconds after the last Key On Engine Off DTC. Then, 6-9 seconds after the single 1/2 second separator pulse, the Continuous Memory DTC's will be issued.
Continuous Memory Diagnostic Trouble Codes (DTC's)
Continuous Memory DTC's are issued as a result of information stored during Continuous Self-Test, while the vehicle was in normal operation. These DTC's are displayed only during Key On Engine Off Self-Test and after the separator pulse. Intermittent faults that have not occurred in the last 80 warm-up cycles (40 cycles on some applications) are erased from Continuous Memory and will not produce a Continuous Memory DTC.
NOTE:
The separator pulse and Continuous Memory DTC's follow Key On Engine Off DTC's ONLY.
Engine Running Self-Test
At this time, a test of the EEC system is conducted with the engine running. The sensors are checked under actual operating conditions and at normal operating temperatures. The actuators are exercised and checked for expected results.
Engine Identification Codes (ID Codes)
Engine ID codes are issued at the beginning of the Engine Running Self-Test and are one-digit numbers represented by the number of pulses sent out. For gasoline engines, the engine ID code is equal to one-half the number of engine cylinders (i.e. 2 pulses = 4 cylinders). For the 7.3L Diesel engine, the ID code = 5. These codes are used to verify the proper PCM is installed and that the Self-Test has been entered.
Dynamic Response Check
The dynamic response check is used on some applications to verify operation of the TP, MAF, MAP and KS sensors during the brief Wide-Open Throttle (WOT) performed during the Engine Running Self-Test. The signal for the operator to perform the brief WOT is a single pulse or 10 code on the STAR Tester.
Power Steering Pressure (PSP) Switch Test
On vehicles equipped with Power Steering Pressure (PSP) switch, the steering wheel must be turned one-half turn and released AFTER the ID Code has been displayed. This tests the ability of the EEC system to detect a change of state in the PSP switch.
Brake On/Off Test
On vehicles equipped with Brake On/Off (BOO) input, the brake pedal MUST be depressed and released AFTER the ID Code has been displayed. This tests the ability of the EEC system to detect a change of state in the Brakelamp Switch.
Transmission Control Switch (TCS) Test
On vehicles equipped with TCS, the switch must be cycled after the ID code has been displayed. This tests the ability of the EEC system to detect a change of state in the TCS.
Adaptive Fuel Self-Test
Adaptive fuel logic is used in fuel injection systems primarily to account for normal variability in fuel system components. When, during steady state vehicle operation, the fuel system is detected to be "biased" rich or lean, Adaptive Fuel will make a corresponding shift in the fuel delivery calculations so an un-biased condition will exist. The adaptive fuel "shift" is stored in Keep Alive Memory (KAM), which is powered by the vehicle battery. This prevents Adaptive Fuel from being lost when the vehicle is turned off.
MAF/TP/Injector Pulsewidth In-Range Self-Test
The In-Range Self-Test was designed to detect in-range failures of the MAF/TP or fuel delivery systems. The PCM will use information from these three systems to generate three independent values. The three independent values will be continuously monitored and if one of the values differs significantly from the others during normal vehicle operation a Continuous Memory DTC 121, 124, 125, 184, 185, 186 or 187 will be displayed.
Code Output Format
The EEC system communicates service information through the Diagnostic Trouble Codes (DTC's). These DTC's are two-digit or three-digit numbers representing the results of Self-Test.
The DTC's are transmitted on the Self-Test Output (STO) circuit found in the Data Link Connector (DLC). They are in the form of timed pulses, and are read by the technician on a voltmeter, STAR tester, Malfunction Indicator Lamp (MIL), Transmission Control Indicator Lamp (TCIL) or on the Continental message center.
Diagnostic Trouble Code (DTC) Format
Key On Engine Off and Continuous Memory DTC's
Figure 4: Key On Engine Off and Continuous Memory DTC Format (2-digit DTC's shown, 3-digit DTC's Similar)
Diagnostic Trouble Code (DTC) Format
Engine Running DTC's
Figure 5: Engine Running DTC Format (2-digit DTC's Shown, 3-digit DTC's Similar)
Fast DTC's/Slow DTC's
Fast DTC's are issued prior to slow service DTC's. These DTC's contain the identical information as the slow DTC's, but are transmitted at 100 times the normal rate. These DTC's are interpreted by special equipment at the end of the assembly line by the Body and Assembly Division as well as the SUPER STAR II tester. After Fast DTC's have been output, Self-Test should not be exited (remove jumper, unlatch button, etc.) until all the Slow DTC's have been output. Doing so will erase any Continuous Memory DTC's.
Some meters in service detect these codes as a short burst of information (slight meter deflection).
Continuous Self-Test
The Continuous Memory DTC's are separated from the Key On Engine Off DTC's by a single separator pulse, Figure 6.
Figure 6: Continuous Memory DTC Format (2-digit DTC's Shown, 3-digit DTC's Similar)
During this mode of testing the PCM continuously monitors inputs for opens and shorts. The Continuous Memory DTC's must be retrieved within* 80 engine temperature warm up cycles. On the 81st or 41st Engine Temperature cycle, the DTC will be automatically erased. The Continuous Memory DTC's can also be erased by deactivating Self-Test while the DTC's are being outputted.
*40 engine temperature warm up cycles for some applications.
Thread
Thread Starter
Forum
Replies
Last Post
jamesmonty
1987 - 1996 F150 & Larger F-Series Trucks
7
Jul 18, 2003 11:11 PM
