Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP1987COMANCHE LAREDO, 4.0 M, RWD, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - MULTI-POINTADJUSTMENTS
1987 Jeep Comanche Laredo, 4.0 M, RWD, Automatic
Fuel Injection System - Multi-Point: Adjustments
1987 Jeep Comanche Laredo, 4.0 M, RWD, AutomaticSECTION Adjustments
NOTE:
Idle speed and air/fuel mixture are controlled by the ECU and are non-adjustable. On-car adjustment procedures for other components should not be necessary during normal vehicle operation or maintenance. Adjustments of components should only be required when a faulty component is replaced with a new one.
ECU CONNECTOR PIN IDENTIFICATION 24 PIN CONNECTOR MPFI
| Terminal No. | Wire Function |
|---|---|
| A1 | Injector No. 3 |
| A2 | Injector No. 6 |
| A3 | Injector No. 2 |
| A4 | Injector No. 4 |
| A5 | Fuel Pump Relay |
| A6 | Not Used |
| A7 | Oxygen Sensor Relay |
| A8 | Shift Light |
| A9 | Latch Relay |
| A10 | EGR/Evap. Solenoid |
| A11 | Not Used |
| A12 | A/C Relay |
| B2 | Injector No. 5 |
| B3 | AIS A |
| B4 | AIS A1 |
| B5 | AIS C |
| B6 | AIS C1 |
| B7 | Battery Pos. |
| B8 | Ignition |
| B9 | Not Used |
| B10 | Latched B Pos. |
| B11 | Ground |
| B12 | Ground |
ECU CONNECTOR PIN IDENTIFICATION 32 PIN CONNECTOR MPFI
| Terminal No. | Wire Function |
|---|---|
| C1 | Speed Sensor Pos. |
| C2 | A/C Request |
| C3 | Start |
| C4 | P/N Switch |
| C5 | Sync. |
| C6 | MAP Sensor |
| C7 | TPS Sensor |
| C8 | Air Temp. Sensor |
| C9 | Not Used |
| C10 | Coolant Temp. Sensor |
| C11 | Injection Supply |
| C12 | TX Serial Data |
| C13 | Not Used |
| C14 | MAP Sensor Supply Voltage |
| C15 | TPS Supply Voltage |
| C16 | Sync. Pos. |
| D1 | Speed Sensor Neg. |
| D2 | A/C Select |
| D3 | Sensor Ground |
| D4 | Not Used |
| D5 | Not Used |
| D6 | Not Used |
| D7 | Not Used |
| D8 | Knock Sensor Ground |
| D9 | Oxygen Sensor Input |
| D10 | Injector Supply |
| D11 | RX Serial Data |
| D12 | Not Used |
| D13 | Spark/Dwell |
| D14 | Not Used |
| D15 | Not Used |
| D16 | Knock Sensor |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.