Circuit Test SCG - Solenoid Controlled By Ground: Notes

WARNING: This page is about a different car, the 1994 Mercury Tracer and 1994 Ford Escort. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Injector Connector Terminal ID (SCG1)

Fig 2: Injector Connector Terminal ID (SCG1)

Fig 3: Typical Solenoid Connector Terminal ID (SCG2)

Fig 4: EVR/VRIS Solenoid Port ID (SCG3)

NOTE: Enter this test only when Code 25, 26, 28, 29, 34, 41 or 46 is displayed during self-test procedures (KOEO or KOER). This test is intended to diagnose following solenoids and circuits: Canister Purge (CANP), EGR Control (EGRC), EGR Vent (EGRV), EGR Vacuum Regulator (EVR), Fuel Pressure Regulator Control (FPRC), High Speed Inlet Air Control (HSIA), Idle Air Control (IAC), injectors (INJ) or injector banks (BANK), and Variable Resonance Induction System Solenoids (VRIS).

CIRCUIT PIN IDENTIFICATION

Circuit

Breakout Box Pin No.

ECA Pin

Wire Color

A/T

BANK1

Yellow

BANK2

Yellow/Black

CANP

White/Blue

FPRC

⁽¹⁾ 21A

Green/Orange

HSIA

Black/Red

IAC

⁽²⁾ 21B

Blue/Orange

M/T

BANK1

Yellow

BANK2

Yellow/Black

CANP

White/Blue

FPRC

Green/Orange

HSIA

Black/Red

IAC

Blue/Orange

⁽¹⁾	Ensure Breakout Box Adapter selector switch is in "A" position.

⁽²⁾	Ensure Breakout Box Adapter selector switch is in "B" position.

1) Checking System Integrity Visually check all wiring, connectors and components for damage, shorting or looseness. If a fault is found, repair as necessary. If no fault is found, go to next step.

2) Solenoid Function Turn ignition off. Install breakout box, leaving PCM disconnected. Check function of appropriate solenoid. See SOLENOID ACTIVATION TEST. If solenoid functions okay, test is complete. If no other problem or code is found, replace PCM. If solenoid does not function properly, go to next step.

3) Check Power To Solenoid Turn ignition off. Disconnect connector of solenoid to be tested. Turn ignition on. Measure voltage between connector ground and VPWR terminal at solenoid connector. If voltage is less than battery voltage, go to CIRCUIT TEST VPWR. If VPWR circuit is okay, repair VPWR wire to solenoid. If voltage is battery voltage, go to next step.

4) Check For Open Solenoid Wire To PCM Turn ignition off. Ensure breakout box is installed and PCM is disconnected. Disconnect connector of solenoid to be tested. Measure resistance between solenoid test pin at breakout box and terminal at solenoid connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open solenoid wire to PCM.

5) Check For Short In Solenoid Wire To PCM Turn ignition off. Ensure breakout box is installed and PCM is disconnected. Disconnect connector of solenoid to be tested. Measure resistance between ground and solenoid test pin at breakout box. If resistance is more than 10,000 ohms, replace solenoid. If resistance is less than 10,000 ohms, repair short to ground in solenoid wire.