Powertrain connectors

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Powertrain Connectors

This is a list of connectors that may be found on the wiring harness(es) in the engine compartment.


Main wiring harness

Reference photos

(1) PCM connectors

91-99

Please refer to the page about the PCM connections

  • Location: Inside passenger compartment, behind gauge cluster. Harness plugs can be access from under the dash, PCM can be removed by loosening a nut from above the dash after removing the dash cover.

00-02

Please refer to the page about the PCM connections

  • Location: PCM is located under the hood behind the battery during these years.

(2) Underhood Fuse Box

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location: Harness is under the under hood fuse box, which is in the driver's side front corner of the engine compartment.


(3) Intake Air Temp Sensor (IAT)

  • Number of wires: 2
  • Colors of wires:
    • A - TAN (MAT SENSOR SIGNAL)
    • B - BLK (5v {PCM})
  • Applicable years/features: All Years
  • Location: In the intake tubing, location varies by year and model.
  • Saturn part:
    • 12117087 - Connector kit

(4) Ground

  • Number of wires: 1
  • Colors of wires:
  • Applicable years/features:
  • Location: front driver's side of the engine compartment, under the air filter box of most models, near the underhood fuse box.

(5) Unknown I

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location:

(6) Engine Coolant Temperature Sensor (ECTS)

  • Number of wires: 2
  • Colors of wires:
    • A - YELLOW (SIGNAL)
    • B - BLK (5v {PCM})
  • Applicable years/features: 91-02 all models
  • Location: Driver's side of the head, under the EGR valve
  • Saturn part:
    • 12117087 - Connector kit
    • 12092512 - Connector

Note: Rare OBDII 95, and 96-02 ECTS handles both PCM and gauge functions, as opposed to 91-94 which had separate sensors for each.

(7) Engine Coolant Temperature Sensor - Gauge Sensor

  • Number of wires: 1
  • Colors of wires:
    • A - DARK GREEN (SIGNAL)
  • Applicable years/features: 91-94 all models
  • Location: Driver's side of the head
  • Saturn part:
    • 12117086 - Connector kit
    • 12092511 - Connector

Note: Rare OBDII 95, and 96-02 ECTS handles both PCM and gauge functions, as opposed to 91-94 which had separate sensors for each.

(8) EGR

91-94 (Vacuum EGR)

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location: between the intake tubing and the valve cover/head

Note: looks much like a fuel injector connector. Note: 94 models with California Emissions have an adapter plate to use the electronic EGR

94-02 (Electronic EGR)

  • Number of wires: 5
  • Colors of wires:
    • A - BROWN (SIGNAL TO EGR MODULE)
    • B - BLACK (RETURN TO PCM)
    • C - BROWN (SENSE TO PCM)
    • D - GRAY (TO PCM 5v)
    • E - PINK (FROM UHJB)
  • Applicable years/features:
  • Location: between the intake tubing and the valve cover/head
  • Saturn part:
    • 12124825 - Connector

Note: 94 models with California Emissions have an adapter plate to use the electronic EGR

(9 & 10) Ignition Coils

Early style (years need identified)

Late style (years need identified)

Note: later years used a single harness plug to plug into the base under the ignition coils.

(11) Ground

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location:

(12) Ground

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location:

(13) Oxygen Sensor - Exhaust Manifold

  • Number of wires: 1
  • Colors of wires:
  • Applicable years/features:
  • Location: in the front of the exhaust manifold

(14) Cooling Fan

  • Number of wires: 2
  • Colors of wires:
    • A - BLACK (GROUND)
    • B - LIGHT BLUE (COOLING FAN RELAY)
  • Applicable years/features:
  • Location: on the motor of the cooling fan, mounted on the radiator
  • Saturn part:
    • 12116571 - Connector kit
    • 12103172 - Connector

(15) Ground

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location:

(16) Reverse

  • Number of wires: 2
  • Colors of wires:
    • A - LIGHT GREEN (TO LAMPS)
    • B - PINK (FROM FUSE - IGN1)
  • Applicable years/features: Manual trans
  • Location: On top of the trans.
  • Saturn part:
    • 12103584 - Connector kit

(17) Vehicle Speed Sensor (VSS)

  • Number of wires: 1 (plug has space for 2 wires)
  • Colors of wires:
    • A - YELLOW (SIGNAL HI)
    • B - PURPLE (SIGNAL LO)
  • Applicable years/features:
  • Location: Rear of transmission housing, above the differential (between where the axles enter the transmission).
  • Saturn part:
    • 12052644 - Connector kit

(18) Evaporator Purge Solenoid (EVAP)

  • Number of wires: 2
  • Colors of wires:
    • A - PINK (UHJB)
    • B - DARK GREEN (PCM)
  • Applicable years/features:
  • Location: Rear of engine, between the starter and intake manifold
  • Saturn part:
    • 12084126 - Connector kit

(19) Ground

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location:

(20) Crank Position sensor (CPS)

  • Number of wires: 2
  • Colors of wires:
    • A - PURPLE (IGN MOD LO)
    • B - YELLOW (IGN MOD HI)
  • Applicable years/features:
  • Location: back side of engine
  • Saturn part:
    • 12052642 - Connector kit

(21) Throttle Position Sensor (TPS)

  • Number of wires: 3
  • Colors of wires:
    • A - GRAY (5v BAT)
    • B - BLACK (CLT RETURN)
    • C - DARK BLUE (TP SENSOR)
  • Applicable years/features:
  • Location: on the throttlebody

(22) Idle Air Control Valve (IAC)

  • Number of wires: 4
  • Colors of wires:
    • A - LIGHT GREEN/BLACK (IAC B LO)
    • B - LIGHT GREEN/WHITE (IAC B HI)
    • C - LIGHT BLUE/BLACK (IAC A LO)
    • D - LIGHT BLUE/WHITE (IAC A HI)
  • Applicable years/features:
  • Location: on the throttlebody
  • Saturn part:
    • 12110188 - Connector kit

(23) Starter

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location: Lower backside of the engine

(24) Oil Pressure Sensor

Early stlye

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location: Lower rear of engine

Note: looks similar to the ECTS connector.

Late style

  • Number of wires: 1
  • Colors of wires:
  • Applicable years/features: (years not yet narrowed down, includes 98-99)
  • Location: Lower rear of engine

(25) Power Steering Pump

  • Number of wires: 2
  • Colors of wires:
  • Applicable years/features: DOHC only, SOHC power steering did not feature variable assist and thus does not plug in.
  • Location: Far upper passenger rear of the engine. Access can be difficult, if pulling or installing an engine, it may be easiest to plug/unplug with the engine leaned forward.

Note: connector in photos missing rubber seal

(26) Alternator

  • Number of wires: 2 (plug has space for 4 wires)
  • Colors of wires:
  • Applicable years/features:
  • Location: Passenger rear of engine

(27) Knock sensor

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location: back side of engine

(28-31) Injectors

  • Number of wires: 2 each (X 4 injectors = 8 wires)
  • Colors of wires:
  • Applicable years/features:
  • Location: along the fuel rail, the set of connectors passes up through the intake manifold between the 2nd and 3rd runners (as does the MAP sensor connector)

(32) Manifold Air Pressure Sensor (MAP)

  • Number of wires: 3
  • Colors of wires:
    • A - BLACK (5v RETURN)
    • B - LIGHT GREEN (MAP SIGNAL)
    • C - GRAY (5v BATT)
  • Applicable years/features:
  • Location: Passenger side of the intake manifold, accessible from above the engine
  • Saturn part:
    • 12020403 - Connector kit

(33) Transaxle Actuators

  • Number of wires: 10
  • Colors of wires:
    • A - LIGHT GREEN (G3 POWER)
    • B - YELLOW/BLACK (G3 ACTUATOR)
    • C - LIGHT GREEN (G4 POWER)
    • D - PURPLE (G4 ACTUATOR)
    • E - WHITE (TCC ACTUATOR)
    • F - DARK BLUE (MLP ACTUATOR)
    • G - RED (MLP ACTUATOR)
    • H - LIGHT GREEN (G2 ACTUATOR)
    • J - WHITE (G2/TCC POWER)
    • K - TAN/BLACK (TRANS PRESSURE SWITCH)
  • Applicable years/features: Auto trans (MP6 or MP7)
  • Location: On top of the trans.

(34) Auto trans gear selector ground

  • Number of wires: 1
  • Colors of wires:
    • A - BLACK/WHITE (GROUND)
  • Applicable years/features: automatic transmission (MP6 or MP7)
  • Location: top of the auto trans gear selector / range switch

(34.5) Auto trans gear selector

  • Number of wires: 6
  • Colors of wires:
    • A - BLK/WHITE
    • B - YEL
    • C - GRA
    • D - WHT
    • E - DK BLU
    • F - LT GRA
  • Functions of wires:
    • A - Shift select 1
    • B - Shift select 2
    • C - Shift select 3
    • D - Shift select D
    • E - Reverse Switch
    • F - Reverse Switch
  • Applicable years/features: automatic transmission (MP6 or MP7)
  • Location: top of the auto trans gear selector / range switch

(35) Rear O2 sensor (post catalytic converter oxygen sensor):

  • Number of wires: 4
  • Colors of wires:
  • Applicable years/features:
  • Location: on top of the rear of the subframe, by where the shifter/gear selector cable(s) pass through the firewall

Other Underhood Connectors

Air conditioning (AC)

  • Number of wires:
  • Colors of wires:
  • Applicable years/features: Cars with air conditioning, of course.
  • Location: on the AC compressor. The wire is not on the main engine/trans wiring harness.

Brake Master Cylinder

  • Number of wires:
  • Colors of wires:
  • Applicable years/features:
  • Location: driver's side of the brake master cylinder, which is on the driver's side of the firewall