1994 PCED OBDI-A | SECTION 2A: Diagnostic Routines |
DSR-: Diagnostic Sub-Routines
DSR-1.0 VEHICLE PREPARATION AND EQUIPMENT HOOKUP
- Apply parking brake.
- Place shift lever firmly in PARK (NEUTRAL for manual transmissions/transaxles).
- Block drive wheels.
- Turn off all electrical loads.
- Connect appropriate test equipment to the Data Link Connector in order to run Self-Test.
Note: If additional information is required for Vehicle Preparation and Equipment Hookup, refer to Section 5A, Quick Test Appendix.
Is vehicle prepared to run Self-Test?
| Yes | No |
|---|
| GO to Diagnostic Sub-Routine 2.0. | REPEAT this test step. |
DSR-2.0 PERFORM KOEO SELF-TEST
- Start engine and idle until vehicle is at operating temperature. If engine does not start or stalls, continue to perform KOEO Self-Test.
- For 4.9L M/T engine only, depress clutch for entire test step.
- For 7.3L diesel engine only, depress throttle for entire test step.
- Key off, wait 10 seconds.
- Activate KOEO Self-Test.
- Key on, engine off.
Note: If additional information is required for KOEO Self-Test, refer to Section 5A, Quick Test Appendix.
- Record all KOEO and Continuous Memory Diagnostic Trouble Codes (DTCs).
- Key off.
Is a PASS DTC "11" or "111" present in KOEO Self-Test?
(11/111-10-any code)
| Yes | No |
|---|
| GO to Diagnostic Sub-Routine Step 3.0. | GO to the EEC-IV DTC Charts at the end of this section for pinpoint test direction. |
DSR-3.0 CHECK BASE TIMING
- Key off.
- Transmission in PARK or NEUTRAL.
- Turn off electrical loads (A/C, heater, etc.).
- Disconnect the in-line SPOUT connector.
- Start engine (do not use a remote starter, only use the ignition key to start engine).
Note: If engine stalls, reconnect SPOUT connector and go to Section 6A, Pinpoint Test Step S2.
If engine is now a NO START (will not "Fire" at all), reconnect SPOUT connector and go to Section 8A.
- Check base timing. Refer to the Ignition/Engine Group in the Service Manual for specific instructions. (For 2.3L Dual Plug, use exhaust side plug. If timing light does not light, go to Diagnostic Sub-Routine 5.0.)
Is base timing within ± 2 degrees of specification on VECI decal (base timing is 10 degrees BTDC if not specified on VECI label)?
| Yes | No |
|---|
| GO to Diagnostic Sub-Routine 4.0. | For Distributor Ignition (DI) applications:
ADJUST as necessary and RERUN Quick Test. If unable to adjust to specification, refer to the Ignition/Engine Group in the Service Manual to check proper distributor orientation, timing chain/belt, etc.
For Electronic Ignition (EI) applications:
Base timing is not adjustable. Refer to the Ignition/Engine Group in the Service Manual for possible causes of incorrect base timing (timing chain/belt, incorrect CMP/Synchronizer sensor orientation, etc.). |
DSR-4.0 VERIFY PCM CONTROL OF TIMING
- In-line SPOUT connector disconnected.
- Start engine and let idle.
- Reconnect the in-line SPOUT connector.
Does timing change from base timing when the SPOUT connector is reconnected?
| Yes | No |
|---|
| GO to Diagnostic Sub-Routine 5.0. | GO to Diagnostic Sub-Routine 5.0. While performing the Engine Running (ER) Self-Test, CHECK for DTC 213/18.
If ER DTC 213/18 is present:
Disregard any other codes. Refer to the EEC-IV DTC Charts for proper pinpoint test step direction for the DTC 213/18.
If ER DTC 213/18 is NOT present:
Continue as directed in Diagnostic Sub-Routine 5.0. |
DSR-5.0 PERFORM ENGINE RUNNING SELF-TEST
- Start engine and idle until vehicle is at operating temperature.
- Turn engine off.
- Activate Engine Running Self-Test.
- Start engine.
Note: If engine stalls during Engine Running Self-Test, go to Section 6A,~ Pinpoint Test Step S2.
If additional information is required for Engine Running Self-Test, refer to Section 5A, Quick Test Appendix.
- Record all service codes displayed.
Note: Engine Running DTC 98/998 indicates vehicle is in FMEM mode and Engine Running Self-Test cannot be performed. Go to the EEC-IV DTC charts at the end of this section for DTC 98/998 direction.
Is a PASS DTC (11 or 111) received during Engine Running Self-Test?
| Yes | No |
|---|
| GO to Diagnostic Sub-Routine Step 6.0. | GO to the EEC-IV DTC Charts at the end of this section for pinpoint test direction. |
DSR-6.0 ADDRESS CONTINUOUS MEMORY DTC
Was a Continuous Memory PASS DTC (11/111-10-11/111) received during Key On Engine Off Self-Test?
| Yes | No |
|---|
| RETURN to Diagnostic Routine Symptom Flow Chart. | GO to the EEC-IV DTC Charts at the end of this section for pinpoint test direction. |
DSR-10.0 VEHICLE PREPARATION AND EQUIPMENT HOOKUP
- Apply parking brake.
- Place shift lever firmly in PARK (NEUTRAL for manual transmissions/transaxles).
- Block drive wheels.
- Turn off all electrical loads.
- Connect appropriate test equipment to the Data Link Connector in order to run Self-Test.
Note: If additional information is required for Vehicle Preparation and Equipment Hookup, refer to Section 5A, Quick Test Appendix.
Is vehicle prepared to run Self-Test?
| Yes | No |
|---|
| GO to Diagnostic Sub-Routine 11.0. | REPEAT this test step. |
DSR-11.0 PERFORM KOEO SELF-TEST
- Start engine and idle until vehicle is at operating temperature. If engine does not start or stalls, continue to perform KOEO Self-Test.
- For 4.9L M/T engine only, depress clutch for entire test step.
- For 7.3L diesel engine only, depress throttle for entire test step.
- Key off, wait 10 seconds.
- Activate KOEO Self-Test.
- Key on, engine off.
Note: If additional information is required for KOEO Self-Test, refer to Section 5A, Quick Test Appendix.
- Record all KOEO and Continuous Memory Diagnostic Trouble Codes (DTCs).
- Key off.
Is a PASS DTC "11" or "111" present in KOEO Self-Test?
(11/111-10-any code)
| Yes | No |
|---|
| RETURN to Diagnostic Routine Flow Chart. | GO to the EEC-IV DTC Charts at the end of this section for pinpoint test direction. |