KOEO & KOER DTCs (Hard Faults)
These DTCs indicate faults are present at time of testing. A hard fault may cause CHECK ENGINE or Malfunction Indicator Light (MIL) to go on and remain on until fault is repaired. If KOEO or KOER DTCs are retrieved during KOEO ON-DEMAND SELF-TEST or KOER ON-DEMAND SELF-TEST, use DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART to find appropriate circuit test to perform.
Continuous Memory DTCs (Intermittent Faults)
These DTCs are used to diagnose intermittent problems. Continuous Memory DTCs are retrieved after KOER ON-DEMAND SELF-TEST. These DTCs indicate a fault that may or may not be present at time of testing.
After noting and/or repairing fault, clear DTCs from memory. See CLEARING CODES . Intermittent faults may be caused by a sensor, connector or wiring-related problem. See INTERMITTENTS in TESTS W/O CODES - 7.3L DIESEL article.
| CAUTION | Continuous Memory DTCs should be recorded when retrieved. These DTCs may be used to identify intermittent problems that exist after all KOEO and KOER DTCs have been repaired. Some Continuous Memory DTC faults may not be valid after KOEO and KOER DTCs are serviced. |
RETRIEVING CODES
DTCs are retrieved from powertrain control system through Data Link Connector (DLC). (Scheme 132) Self-diagnostic test procedures are for use with New Generation Star (NGS) scan tool. If a generic scan tool is used, ensure scan tool is certified to OBD-II standard.
| Application | Location |
|---|---|
| "E" Series | Below Left Side Of Instrument Panel, To Right Of Steering Column |
DATA LINK CONNECTOR (DLC) LOCATIONS
Scheme 132
Pass Codes
No DTCs present (system pass) indicates no diagnostic trouble codes were recorded in that portion of test. If system pass is not retrieved in KOEO ON-DEMAND SELF-TEST, DTCs retrieved during KOER ON-DEMAND SELF-TEST may not be valid.
Continuous Memory DTCs
These DTCs result from information stored by PCM during continuous self-test monitoring. Use these DTCs for diagnosis only when KOEO ON-DEMAND SELF-TEST and KOER ON-DEMAND SELF-TEST result in a system pass (no DTCs present) and all steps under QUICK TEST have been successfully completed. These DTCs indicate faults previously recorded. Fault may or may not be currently present. See DIAGNOSTIC TROUBLE CODE (DTC) REFERENCE CHART .
CLEARING CODES
Ensure test equipment is properly attached. Program scan tool using the following steps
- Select VEHICLE & ENGINE SELECTION menu.
- Select NEW VEHICLE, YEAR & MODEL.
- Select DIAGNOSTIC DATA LINK.
- Select PCM - POWERTRAIN CONTROL MODULE.
- Select DIAGNOSTIC TEST MODE.
- Select RETRIEVE/CLEAR CONTINUOUS DTCs.
- Turn ignition on.
- Select CLEAR ALL.
All DTCs should now be cleared from PCM memory. If problem has not been corrected or fault is still present, hard DTC will immediately be reset in PCM memory.
| CAUTION | DO NOT disconnect vehicle battery to clear DTCs. This will erase operating information from Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes. |
| CAUTION | When battery is disconnected, vehicle computer may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in the GENERAL INFORMATION section before disconnecting battery. |
VISUAL CHECK
Perform the following, and make all necessary repairs before continuing with QUICK TEST
- Inspect air cleaner and inlet ducts.
- Inspect system wiring harness for proper connections, bent or broken pins, corrosion, loose wires and proper routing.
- Check Powertrain Control Module (PCM), sensors and actuators for physical damage.
- Check engine coolant for proper level and mixture.
- Check transmission fluid level and quality.
VEHICLE PREPARATION & EQUIPMENT HOOKUP
Apply parking brake, and place shift lever in Park (A/T) position. Block drive wheels. Turn off all electrical accessories. If vehicle is equipped with an auxiliary powertrain control system (RPM control), it must be turned off when performing SELF-TEST. Connect appropriate test equipment to vehicle as follows
ADDITIONAL SYSTEM FUNCTIONS
Note. Additional diagnostic system features are available to help diagnose driveability problems and service EEC-V systems.
DRIVER OPERATED CONTROLS CHECK
Using New Generation Star (NGS) scan tool, select appropriate PID to be checked. See PARAMETER IDENTIFICATION (PID) and PARAMETER IDENTIFICATION (PID) VALUES table. If PID value is not as specified, perform CIRCUIT TEST.
| PID | Test Condition | (1) PID Value | Go To |
|---|---|---|---|
| AP | Accelerator Released | (2) 0.6 Volt | N/a |
| AP | Wide Open Throttle | (2) 3.8 Volts | CIRCUIT TEST E |
| IVS | Accelerator Released | Off | N/a |
| IVS | Wide Open Throttle | On | CIRCUIT TEST AA |
| BOO | Brake Pedal Depressed | On | N/a |
| BOO | Brake Pedal Released | Off | CIRCUIT TEST K |
| BPA | Brake Pedal Depressed | On | N/a |
| BPA | Brake Pedal Released | Off | CIRCUIT TEST P |
| PBA | Parking Brake On | On | N/a |
| PBA | Parking Brake Off | Off | CIRCUIT TEST Q |
| CPP/TCS (3) | OD CNCL Button Depressed | On | N/a |
| CPP/TCS (3) | OD CNCL Button Released | Off | (4) |
| TR (3) | Gear Selector In "P" | P/N | N/a |
| TR (3) | Gear Selector In "R" | REV | N/a |
| TR (3) | Gear Selector In "N" | NTRL | N/a |
| TR (3) | Gear Selector In OD | OD | N/a |
| TR (3) | Gear Selector In OD With OD Light On | DRIVE | N/a |
| TR (3) | Gear Selector In L2 | MAN2 | N/a |
| TR (3) | Gear Selector In L1 | MAN1 | (4) |
| TCIL (3) | With Ignition On | Off | N/a |
| TCIL (3) | Push OD Cancel (Latch) | On | N/a |
| TCIL (3) | Push OD Cancel (Unlatch) | Off | (4) |
| SCCS M (5) | With Ignition On | Open | N/a |
| SCCS M (5) | Speed Control Off | Off | N/a |
| SCCS M (5) | Speed Control On | On | N/a |
| SCCS M (5) | Set/Accel | Set A/C | N/a |
| SCCS M (5) | Coast | Coast | N/a |
| SCCS M (5) | Resume | Resume | CIRCUIT TEST F |
| CRUISE | (Speed Control/When Driving Only) Off | Off | N/a |
| CRUISE | (Speed Control/When Driving Only) On | STNDBY | N/a |
| CRUISE | Set/Accel (After Pressing) | Tap Up | N/a |
| CRUISE | Coast (After Pressing) | Tap Down | CIRCUIT TEST F |
| 4x4L | 4x4H Or 2H | Off | N/a |
| 4X4L | 4x4L | On | CIRCUIT TEST AD |
| ACCS (6) | Max/Norm A/C Or Mix/DEF With A/C Clutch On | On | N/a |
| ACCS (6) | Floor, Vent or A/C Clutch Off | Off | CIRCUIT TEST AE |
| (1) If PID value is not as specified, perform appropriate test under CIRCUIT TESTS . (2) Voltage is approximate. (3) E4OD automatic transmission only. (4) See appropriate AUTOMATIC TRANSMISSION article. (5) Speed control. (6) A/C controls. | |||
| (1) | If PID value is not as specified, perform appropriate test under CIRCUIT TESTS . |
| (2) | Voltage is approximate. |
| (3) | E4OD automatic transmission only. |
| (4) | See appropriate AUTOMATIC TRANSMISSION article. |
| (5) | Speed control. |
| (6) | A/C controls. |
PARAMETER IDENTIFICATION (PID) VALUES
Performing Drive Cycle
- Turn ignition on, but do not crank engine until WAIT TO START light turns off, or 10 seconds has passed (whichever is greater).
- Start engine. Allow engine to idle with transmission in Park for 40 seconds.
- The following conditions must be followed to run certain OBD-II monitors that require engine to be under a load. Depress OVERDRIVE switch (overdrive mode off) to perform test in 3rd gear. Turn on accessories (headlights, A/C compressor, blower fan, etc.). DO NOT use hazards or PTO. Select an uphill or level road. DO NOT select a downhill road. Driving downhill will unload engine and defeat test.
- Accelerate steadily to 3rd gear and keep engine speed at 1500 RPM for 3 seconds. Accelerate steadily from 35 MPH to 65 MPH in about 15 seconds. Repeat this procedure 3 times while maintaining conditions set in step 3). Before proceeding, turn all accessories off and depress OVERDRIVE switch (overdrive mode on). On A/T models, go to next step.
- On A/T models, drive vehicle in 4th gear continuously for one minute. Accelerate steadily from a full stop to 4th gear and then return to a full stop. Repeat this procedure 10 times, then go to next step.
- Before continuing, use scan tool and select EOT PID from PID/DATA monitor menu. Ensure EOT PID value is more than 140°F (60°C). Allow engine to idle for 20 seconds in Park. Turn ignition off. State engine. Allow engine to idle for 40 seconds in Park. Repeat «QUICK TEST»(ref-24260-S02984646372001010400000) . Drive cycle is complete.
- If P1000 is present after performing drive cycle, repeat step 4) maintaining a minimum MFDES PID value of 37 milligrams/stroke with engine speed at more than 1500 RPM for 11 seconds. Also, repeat step 6). MFDES PID value must remain less than 12 milligrams/stroke for 11 seconds.
SUMMARY
If no diagnostic trouble DTC is present but driveability problem still exists, proceed to TESTS W/O CODES - 7.3L DIESEL article for symptom diagnosis or intermittent diagnostic procedures.
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 TEST steps refer to test terminals on manufacturers breakout box.
HOW TO USE CIRCUIT TESTS
- Ensure all non-EEC related faults found while performing steps in «BASIC DIAGNOSTIC PROCEDURES»(ref-160618) article have been corrected. DO NOT perform any CIRCUIT TEST unless specifically instructed by a QUICK TEST procedure or a diagnostic trouble code reference chart. Follow each test step in order until fault is found. DO NOT replace any part unless directed to do so. When more than one DTC is retrieved, start with first DTC displayed.
- CIRCUIT 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 ignition on or as specified in CIRCUIT TESTS.
- 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 (wiring harness side). Isolate both ends of a circuit and turn ignition off when checking for shorts or continuity, unless instructed otherwise.
- 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»(ref-24260-S02984646372001010400000) .
- An open circuit is defined as a resistance reading of more than 5 ohms. This specification tolerance may be too high for some items in EEC-V 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 10,000 ohms to ground, unless stated otherwise in CIRCUIT TEST.