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Terminated engine harness for GM LS engines.

Compatible with MaxxECU RACE only!

 

 

GM LS differences

Feature

GEN III (5.7L LS1/LS6)

GEN IV (6.0L LS2, 7.0L 6.2L LS3/LS4/LS7/LSX/LS9)

Note

Knock sensor

1-wire, rear mounted

On each side of the engine block, 2-wire

 

CAM sensor position

Rear

In the front of engine.

Wiring position change: A->C and C->A

Alternator connector

 

 

Superseal connector in the rear of engine, uses an cable adapter to fit the correct alternator.

Crank sensor connector

Position: Below right bank

Position: Below right bank

Superseal connector close to sensor, uses an cable adapter to fit the correct engine.

 

 

Harness support

Terminated engine harness

MaxxECU RACE I/O

Note

+12V to injectors, ignition

Yes

 

Cylinder head GND

Engine GND

 

OEM generator

Yes

 

OEM engine starter

Yes

*Can be an Eylet terminal on some engines

Injectors

INJ 1-8

Uses Bosch JPT connectors

Ignition coils

IGN 1-8

Stock coils used

OEM coolant temperature sensor

CLT

Stock sensor used

OEM E-Throttle position sensors

TPS, AIN 3

Stock E-Throttle used

IAT

IAT

External one needed (not included)

OEM crank trigger

TRIGGER

Uses stock Trigger

OEM HOME trigger

HOME

Uses stock Trigger

OEM oil pressure sensor

AIN 4

 

E-Throttle

GPO 11, GPO 12

 

Boost solenoid

GPO 1

2-way superseal connector (solenoid not included)

OEM knock sensors

KNOCK1, KNOCK2

Uses GEN IV OEM knock sensors

MAP sensor hose in harness

Yes

To be mounted on intake

Fuel pump relay control

GPO 2/or use any available output

 

Engine FAN relay control

GPO 6/or use any available output

 

Wideband LSU connector

Yes

Single LSU 4.2, secondary WBO CAN module can be used in the 4-pin connector in the rear.

EGT option

Yes, 8pcs direct

 

 

 

Length

Start

End

Total length

MaxxECU CMC connector

Firewall entry/bushing

800mm

MaxxECU CMC connector

LSU connector

1850mm

MaxxECU CMC connector

IGN 1 coil connector

2200mm

 

 

 

Harness connectors

clip0826

E-Throttle connector.

 

 

clip0827

E-pedal connector.

 

 

clip0828

Knock sensor connectors (GEN IV).

 

 

clip0829

BOSCH JPT injector connectors.

 

 

clip0830

Ignition coil connectors, for OEM coils.

 

 

clip0831

Since GEN III and GEN IV uses different alternators, the correct adapter cable must be used to the main harness.

 

ID 1955 - Bosch alternator (2-pin connector)

ID 1956 - Mitsubishi alternator (4-pin connector)

 

 

 

clip0832

GEN III and GEN IV uses different connector/pinout on the CRANK TRIGGER, the correct adapter cable must be used to the main harness.

 

ID 1957 - GEN III crank trigger adapter cable

ID 1958 - GEN IV crank trigger adapter cable

 

 

 

clip0833

GEN III and GEN IV GM LS uses idfferent connector/pinout on the CAM, the correct adapter cable must be used to the main harness.

 

ID 1959 - GEN III cam adapter cable

ID 1960 - GEN IV cam adapter cable

 

 

 

clip0834

An extra cable with a 2-pin superseal connector is wired to be used with for ex a boost solenoid.

 

 

clip0835

The OEM coolant temp (CLT) sensor connector.

 

 

clip0836

Intake Air Temperature (IAT) connector for the 1/8 IAT sensor.

 

 

clip0837

Oil pressure connector (honeywell) for the 3-pin OEM honeywell sensor.

 

 

 

4-pin connector (secondary WBO)

Pin

Description

Usage

Note

1

+12V

+12 power supply

 

2

CAN H


 

3

CAN L

 

 

4

Engine GND

 

 

 

 

 

6-pin connector (E-pedal)

Pin

Description

Usage

Note

1

Sensor GND


GND for all sensors, NEVER connect to engine GND

2

Sensor GND


GND for all sensors, NEVER connect to engine GND

3

AIN 7

0-5V analog input

Used as Main Pedal position

4

+5V sensor supply

 

Power supply for all +5V sensors

5

+5V sensor supply

 

Power supply for all +5V sensors

6

AIN 8

0-5V analog input

Used as Backup Pedal position

 

 

 

12-pin connector (seen from the wire side)

12-pin_connector

Note: Pinout is from the wiring side of the extra connector, not the terminated harness.

 

Pin

Description

Usage

Note

1 (A)

+12V ignition coils power supply


Connect to a +12V switched (and 20A fused) source

2 (B)

Engine ground


Engine ground (if needed)

3 (C)

GPO 2 (fuel pump)

Output

GND output for relay control

4 (D)

GPO 6 (FAN)

Output

GND output for relay control

5 (E)

GPO 3

Output

GND output for relay control

6 (F)

Engine starter (+12V) - Connect to ignition key or switch


Put +12V on this wire from a switch or simply the ignition key crank pos.

7 (G)

+12V ECU power supply


Connect to a +12V switched (and 15A fused) source

8 (H)

GPO 8/TACHO

Output

Selectable GND output with 5 or 12V pullup

9 (J)

GPO 15 (+12V)

Output

GND output for relay control

10 (K)

Motor 2 + (H-bridge output)

Output

* (if not using E-Throttle, this output (1 of 4 needed) can be used to control idle solenoid)

11 (L)

Motor 2 - (H-bridge output)

Output

* (if not using E-Throttle, this output (1 of 4 needed) can be used to control idle solenoid)

12 (M)

Alternator


Connect to a switched +12V source (in series with a charge light or a ~500ohm/1W resistor)

 

 

 

16-pin connector (seen from the wire side)

16-pin_connector

Note: Pinout is from the wiring side of the extra connector, not the terminated harness.

 

 

Pin

Description

Usage

Note

1 (H)

+5V power supply

 

Power supply for all +5V engine sensors

2 (G)

Sensor GND

 

GND for all engine sensors, NEVER connect to engine GND

3 (F)

AIN 1

temperature input

*

4 (E)

AIN 2

temperature input

*

5 (D)

AIN 5

0-5V analog input

*

6 (C)

AIN 6

0-5V analog input

*

7 (B)

GPO 7/DIN3

Output or digital input

GND output for relay control or can be used as a digital input (DIN 3)

8 (A)

GPO 5

Output

GND output for relay control

9 (S)

CAN L

 

*

10 (R)

CAN H

 

*

11 (P)

DIN 1

Digital input

*

12 (N)

DIN 2

Digital input

*

13 (M)

DIN 4

Digital input

*

14 (L)

DIN 5

Digital input

*

15 (K)

GPO 4

Output

*

16 (J)

-

-

 

 

 

 

For engines with E-Throttle and E-Pedal removal

In some cases, you want to remove the E-Throttle and E-pedal, and use a regular wire to control the throttle body.

Our solution only supports the E-Throttle, but in the above case, you need to do some wiring changes in our terminated harness.

 

 

clip0658

E-Throttle Pin

E-Throttle pin connector function

MaxxECU IO

Rewire to/note

A

Motor -

CMC2: H2

Not used, but can instead be used to control the stock IAC

B

Motor +

CMC2: H4

Not used, but can instead be used to control the stock IAC

C

Sensor GND

CMC1: H1

Cut and rewire to TPS connector pin B

D

TPS 1 signal

CMC1: G2 (TPS)

Cut and rewire to TPS connector pin C

E

+5V sensor supply

CMC1: G1

Cut and rewire to TPS connector pin A

F

TPS 2

CMC1: J3 (AIN 3)

Not used, but can be used as an extra analog input channel if needed

E-Throttle body connector pinout in our terminated engine harness.

 

clip0659

LS TPS Pin

LS TPS function

MaxxECU IO

Rewire to/note

A (grey)

+5V sensor supply

CMC2: H2

 

B (black)

Sensor GND

CMC2: H4

 

C (green)

TPS signal 1

CMC1: H1

 

D

+5V sensor supply 2

CMC1: G2 (TPS)

Not used in this application

E

Sensor GND 2

CMC1: G1

Not used in this application

F

TPS signal 2

CMC1: J3 (AIN 3)

Not used in this application

TPS connector pinout for most LS engines with no E-Throttle.

 

 

Extra information

ground_is_important

Note: Ground is important...

 

 

See also

Product page

Download base maps