Diagnostic Aids
Following information should be noted during testing:
- When making measurements on a wiring harness, perform both a visual inspection and a continuity test. Inspect terminal connector pins for damage and corrosion when directed to remove a connector.
- When checking voltage drop to Ground, circuit must have a voltage drop of less than one volt.
- Battery voltage, COIL PWR or VPWR is any voltage reading within 2 volts of actual battery voltage.
- Spark timing will vary at idle due to feedback spark strategy used to control idle speed.
- DO NOT connect positive lead of diagnostic cable or CKP-CKP sensor tee until directed to do so.
- DO NOT use incandescent light to test CKP+, CKP-, IDM, PIP or SPOUT circuits.
- EEC-IV Breakout Box (T83L-50-EEC-IV) connected to EI diagnostic cable is referred to as breakout box. If a second breakout box is connected to PCM wiring harness connector, it will be referred to as second breakout box. This setup allows testing of ignition components and wiring harness circuits.
- Circuits are identified in all capital letters; for example: PIP. Manufacturer's breakout box overlay test terminals are identified by a J prefix; for example: J31 (PIP). This indicates test terminal number and circuit identification.
- When the letter "I" follows the circuit identification, it implies measurement is being taken at ICM, for example: J31 (PIP I). When the letter "S" follows the circuit ID, it implies measurement is being taken at Crankshaft Position Sensor (CKP); for example: J33 (PIP S).
- When the letter "C" follows the circuit identification, it implies measurement is being taken at the coil.
EI PINPOINT TEST INDEX
| Result | Pinpoint Test/Step | |
|---|---|---|
| No Start | ||
| No Codes/Codes Not Listed | A/1 | |
| Continuous Memory Code 211 | A/3 | |
| MIL Stays On During Engine Cranking | A/1 | |
| Engine Runs | ||
| Code 212 | B/1 | |
| Code 213 | C/1 | |
| Code 215 Or 216 | D/1 | |
WARNING:
DO NOT connect PCM to EI diagnostic cable. If PCM is connected to diagnostic cable, PCM may be damaged. Some tests may require a second breakout box to be connected to PCM 60 -pin connector. When a second breakout box is used, ensure PCM is disconnected.
WARNING:
DO NOT bring a fluorescent trouble light (drop light) close to vehicle ignition system wiring. If key is on and CKP sensor is disconnected, light may cause ICM to fire ignition coil.
NOTE:
Steps in pinpoint tests are designed to correct one ignition failure at a time. When a component is replaced or service is completed, remove all test equipment. Reconnect all components, and perform QUICK TEST. See the appropriate TESTS W/CODES - EEC-IV (2.0L)
article.