Diagnostic Aids

PINPOINT TEST A is designed for a no-start condition. PINPOINT TESTS B through E are designed to identify hard faults. PINPOINT TESTS F and G are used to search for intermittent failures. Following information should be noted during testing:

• All voltage readings given in test procedures are based on values obtained using a standard DVOM such as Rotunda (007 -00001) or Fluke (20 series, 70 series or 88). DO NOT use RMS type meter.
• When instructed to inspect a wiring harness, perform both a visual inspection and a continuity test.
• When making voltage checks, ground connections should be made at negative battery terminal or cast iron surface of engine.
• When making voltage checks, ground readings are defined as a value of less than 1.0 volt. Battery voltage is defined as a value of more than 10 volts.
• Circuits are identified in all capitals, 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 identification, it implies measurement is being taken at the sensor. CMP is at camshaft sensor and CKP is at crankshaft sensor.
• Test procedures are intended to identify faulty components or wiring while fault is present. If complaint is an intermittent condition, see TESTS W/O CODES - EEC-IV (3.0L) article in the ENGINE PERFORMANCE section.

Fig 1: EI Diagnostic Cable ID (3.0L SHO)

Fig 2: ICM Terminal ID (3.0L SHO)

Fig 3: EI System Pin Voltage Chart (3.0L SHO)

Fig 4: EI System Connector Terminal ID (3.0L SHO)

Fig 5: EI Signal Diagram (3.0L SHO)

Fig 6: EI Circuit ID (3.0L SHO)