Engine Controls - System/component Tests - Eec-Iv (1.9L): Diagnosis

Engine Controls - System/component Tests - Eec-Iv (1.9L): Diagnosis Mercury Tracer I

Test Equipment

Following equipment should be used in these test procedures.

EI Diagnostic Cable (Rotunda 007-00059)
Spark Tester (Neon Bulb Type)
Volt-Ohmmeter (Rotunda 007-00001)
Remote Starter Switch
2 Breakout Boxes (T83L-50-EEC-IV)
Spark Tester (D81P-6666-A)
Inductive Timing Light
Test Light (LED Type) Or Logic Probe (LED Type)

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.

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

EI PINPOINT TEST INDEX

EI Diagnostic Cable Diagram. Scheme 40

Scheme 40: EI Diagnostic Cable Diagram

Identifying EI Circuits. Scheme 41

Scheme 41: Identifying EI Circuits

Identifying EI System Connector Terminal & Component. Scheme 42

Scheme 42: Identifying EI System Connector Terminal & Component

ICM Pin Voltage Chart. Scheme 43

Scheme 43: ICM Pin Voltage Chart

EI Signal Diagram. Scheme 44

Scheme 44: EI Signal Diagram

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 (1.9L) article.

PINPOINT TEST A - NO START

Pinpoint Test A

A1 No Start

A2 Check For Spark

A3 Check Spark Plugs & Wires

A4 Check Vehicle Performance

A5 Check PWR GND To ICM

A6 Check VPWR To ICM

A7 Check CKP (+) Bias At ICM

A8 Check CKP (+) Bias

A9 Check CKP (-) Bias (CKP Disconnected)

A10 Check CKP (-) For Short To Ground

A11 Check CKP (-) For Short To Power

A12 Check PIP At ICM

A13 Check For PIP Continuity To PCM

A14 Check IGN GND At ICM (PCM Disconnected)

A15 Check IGN GND Continuity To PCM (PCM Disconnected)

NOTE: There is a 1000-ohm resistor built into the EI diagnostic wiring harness between J47 and Ignition Ground (IGN GND) circuit.
Fig. 10: Checking IGN GND Continuity To PCM

A16 Check PWR GND At ICM

A17 Check PIP Signal At ICM (PIP Disconnected)

A18 Check PIP For Short To Ground

A19 Check PIP For Short To Power

A20 Check CKP Signal At ICM

A21 Check ICM Signal

A22 Check CKP Circuit Resistance

A23 Check CKP (+) Continuity (Resistance High)

A24 Check CKP (-) Continuity (Resistance High)

A25 Check CKP Air Gap & Trigger Wheel

A26 Check CKP (+) For Short To CKP (-)

A27 Check CKP (+) For Short To Ground

A28 Check CKP (+) For Short To Power

A29 Check CKP Resistance

PINPOINT TEST B - CODE 212: IDM FAILURE

Pinpoint Test B

B1 Check For IDM Signal At ICM

B2 Check For IDM Open

B3 Check IDM Output From ICM

B4 Check For IDM Short In PCM (PCM Disconnected)

B5 Check For IDM Short To Power In Harness

B6 Check For IDM Short To Ground

PINPOINT TEST C - CODE 213 OR LACK OF POWER OR

POOR FUEL ECONOMY

Pinpoint Test C

C1 Check Base Ignition Timing

C2 Check For Spark Angle Advance

C3 Check SPOUT At ICM

C4 Check SPOUT For Short In ICM

C5 Check SPOUT For Short To Power In Harness

C6 Check SPOUT For Short To Ground In Harness

C7 Check SPOUT Continuity To ICM

C8 Inspect CKP Sensor/Trigger Wheel

PINPOINT TEST D - CODE 215 OR 216

Pinpoint Test D

D1 Check For Spark

D2 Check Spark Plugs & Wires

D3 Check For Power At Coil

D4 Check C1 Voltage At Coil Pack

D5 Check C2 Voltage At Coil Pack

D6 Check C1 Voltage At ICM

D7 Check C2 Voltage At ICM

D8 Check C1 At Coil Connector

D9 Check C2 At Coil Connector

D10 Check C1 At Coil Connector While Cranking Engine

D11 Check C2 At Coil Connector While Cranking Engine

D12 Check C1 For Short To Ground

D14 Check C2 For Short To Ground (Coil Disconnected)

D15 Check C2 Circuit (Coil & ICM Disconnected)

D16 Check C1 For Short To Power

D17 Check C2 For Short To Power