ISO Servo Test Procedures/Fuel Systems Update (26-04-88)

Publication date: 1988-09-06
Reference number: 26-04-88

ISO SERVO TEST PROCEDURES/FUEL SYSTEMS UPDATE

TECHNICAL SERVICE BULLETIN

Reference Number(s): 26-04-88, Date of Issue: September 6, 1988

TROUBLESHOOTING SERVICE MANUAL REVISIONS

Model(s): 1987-88 Dodge Colt, Conquest and Colt Vista

Group: Miscellaneous

Bulletin No.: 26-04-88

Date: September 6, 1988

SERVICE INFORMATION

This bulletin updates Troubleshooting Tables, ISO Servo Test Procedures and Fuel Systems for 1987 and 1988 Colt, Colt Vista and Conquest.

Fig 1: COLT VISTA ECI-MULTI-TROUBLESHOOTING - Step 2 (use green connector)

NOTE: * Check meter indication if normal.

NOTE: (1 ) ON means compressor clutch engaged. (2 ) Pointer indicates over 4V momentarily. If it is hard to read indication, repeat the OFF ->ON or ON ->OFF operation of A/C switch several times.

NOTE: If the pointer of voltmeter deflects ISC motor is normal.

Fig 2: Identification of ISC Servo Components

Fig 3: Colt Vista ISC Servo Test Procedure (Steps 1-3)

Fig 4: Colt Vista ISC Servo Test Procedure (Step 4)

Fig 5: Colt Vista ISC Wiring Diagram

1988 COLT STATION WAGON - MPI-TROUBLESHOOTING

CHECK PROCEDURE CHART (USE ECI HARNESS CONNECTOR F - MD998480)

STEP 1 - Connect white color connectors with labeled "CHECKER" of ECI harness connector F to ECI checker.

Fig 6: CHECK PROCEDURE CHART

NOTE: (1 ) ON means compressor clutch engaged. (2 ) Pointer indicates over 4V momentarily if it is hard to read indication, repeat the OFF -> ON or ON -> OFF operation of A/C switch several times. If the pointer deflects, ISC motor is normal. (3 ) Failure of parts other than the oxygen sensor can also cause deviation from the specifications. Therefore, check other parts related to air-fuel ratio control. (4 ) Block inlet to air cleaner while engine is running, voltage should drop slightly.

Fig 7: 1988 Colt Station Wagon ISC Servo Component Identification

Fig 8: Colt Station Wagon ISC Servo Test Procedures (Steps 1-3)

Fig 9: Colt Station Wagon ISC Servo Test Procedure (Steps 4-5)

Fig 10: Colt Station Wagon ISC Structural Diagram (Wiring Diagram)

Fig 11: 1988 Colt Ignition Timing Control System (Federal/California)

Fig 12: 1988 Colt Ignition Timing Control System (Canada)

Fig 13: 1988 Colt 1.5L Engine Vacuum Hose Diagram (Canada)

DISTRIBUTOR COLD ADVANCE CONTROL SOLENOID VALVE - Canada

INSPECTION

NOTE: Before removing vacuum hoses from the solenoid valve put marks on the hoses for correct installation.

Disconnect the vacuum hoses (white stripe yellow stripe) from the solenoid valve.
Disconnect the harness connector.
Connect a hand vacuum pump to the nipple where white stripe vacuum hose is connected. See Fig 14 .

Fig 14: Hand Vacuum Pump Used to Check Air Tightness

Apply vacuum and check air tightness for both when battery voltage is directly applied to the solenoid valve terminal and when no voltage is applied.

VACUUM AND AIR CHECK

Battery voltage	Normal state
Applied	Vacuum leaks
Not applied	Vacuum holds

Measure the solenoid coil resistance.

Standard value: 36 - 44 ohm [at 20°C (68°F)]

Fig 15: FUEL (ECI) SYSTEM - SERVICE ADJUSTMENT PROCEDURES

NOTE: * Failure of parts other than the oxygen sensor can also cause deviation from the specifications. Therefore, check other parts related to air-fuel ratio control.