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1990 JEEP CHEROKEE XJ

WIRING DIAGRAMS — 4.0L RENIX MPI

Source: ALLDATA • Factory Service Manual • System Wiring Diagrams

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Diagram Index

Powertrain Management (ECU)

Renix MPI 4.0L engine control — ignition, fuel, sensors, relays

5 diagrams

Part 1 — ECU & Ignition

Coil, Ignition Module, Distributor, Tachometer, Sync Sensor, Splices

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Part 2 — Fuel Pump & O₂ Sensor

Fuel Pump Relay, O₂ Sensor, Heated O₂ Sensor Heat Relay, Temp Sensor

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Part 3 — EGR & Engine Speed

Fuel Pump Relay cont., EGR Evap Canister Solenoid, Engine Speed Sensor, Knock Sensor

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Part 4 — B+ Latch Relay & A/C

Upshift Indicator, B+ Latch Relay, A/C Thermostat Switch, A/C Clutch Relay

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Part 6 — Injectors & Stepper Motor

AIS Stepper Motor, Fuel Injectors (6-cyl), Knock Sensor, Distributor, ECU Pinout

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Transmission (AW4 Automatic)

Transmission Control Unit, solenoids, switches, and sensors

5 diagrams

Part 1 — TCU & Resistor Pack

Transmission Control Unit connections, Resistor Pack, Cruise/Trans Brake Switch

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Part 2 — Gear Selector & Backup

Backup Lamp Switch, Gear Selector Switch, Transmission Comfort Switch, TCU cont.

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Part 3 — Solenoids & TPS

Transmission internal components (Reed Switch, Solenoids), TPS, TCU Pinout

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TCU Connector Pinout

Transmission Control Unit connector cavity assignments and circuit table

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NSS Terminal Testing

Neutral Safety Switch (Backup Lamp Switch) — AW4 terminal identification and testing matrix

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Starting & Charging

Battery, starter, alternator, ignition switch, and ground distribution

2 diagrams

Starting & Charging

Battery, Starter Motor, Alternator, Ignition Switch, Gear Selector Switch, Ground paths

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Starting & Ground Distribution

Ground distribution, engine ground, splice connections

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System Wiring Diagrams (Full Vehicle)

27-page complete vehicle wiring — cooling, defogger, horn, lights, and more

1 diagram

Complete System Wiring (27 pages)

Cooling Fan, Defogger, Horn, Headlights, Turn Signals, Wipers, A/C, Power Windows, and more

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Other Systems

Antenna, accessories, and additional circuits

1 diagram

Antenna

Power antenna wiring and connections

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OEM Wire Color Reference Key
BLK = Black
RED = Red
BLU = Blue
GRN = Green
YEL = Yellow
ORG = Orange
TAN = Tan
PNK = Pink
VIO = Violet
GRY = Gray
WHT = White
BRN = Brown
LT BLU = Light Blue
LT GRN = Light Green
DK BLU = Dark Blue
DK GRN = Dark Green
Wire codes use Chrysler format: circuit number + gauge + color (e.g., "F22 140R" = Circuit F22, 14-gauge, Orange).
Tracer wires shown with slash (e.g., BLK/YL = Black with Yellow tracer). Asterisk (*) indicates a wire color change at a splice.
1990 Jeep Cherokee XJ • 4WD L6-242 4.0L VIN L FI
Diagrams sourced from ALLDATA DIY and Factory Service Manual system wiring diagrams.
Always verify against your specific vehicle before cutting or connecting any wires.