Land Rover Engine Management Systems Rover Manual

13/14CU AND 14CUX SYSTEMS
13/14CU and 14CUX Systems 99 The screen below provides you with an example of the information available under the icon 
LAMBDA BANK B. (Lambda is another term for oxygen sensor.)  This is an example of how 
TestBook allows you to monitor sensor operation as the engine is operating.
Information is provided on the screen to help you determine if the component is operating within 
specified parameters.  This screen is also helpful in verifying operation following a repair. 

13/14CU AND 14CUX SYSTEMS
100 13/14CU and 14CUX ECM Connector Pin-Outs
1987-88 Lucas 13 CU ECM
PIN WIRE
COLORFUNCTION PIN WIRE COL-
ORFUNCTION
1 RG Stepper “D” 21 YU A/C clutch input
2 NO Battery + Main Relay 22 UR AFM Idle trim
3 Y TPS Reference voltage 23 U Lambda Bank “A”
4 B Lambda ground 24 U Lambda Bank “B”
5 NP (1987) Rear Screen input
(1988) N.C.25 RB Sensor “VE”
6 Y Vehicle Speed input 26 GW Stepper “C”
7 GU Water Temperature input 27 BS Signal Ground
8 -  28 US Stepper “B”
9 WLG Serial Link 29...

13/14CU AND 14CUX SYSTEMS
13/14CU and 14CUX Systems 101 1989 Lucas 14 CU ECM
PIN WIRE
COLORFUNCTION PIN WIRE COL-
ORFUNCTION
1 RG Stepper “D” 21 YB A/C clutch input
2 NO Battery + Main Relay 22 UR AFM Idle trim
3 Y TPS Reference voltage 23 U Lambda Bank “A”
4 B Lambda ground 24 U Lambda Bank “B”
5 BW A/C Fan Switch Input 25 RB Sensor Signal Ground
6 Y Vehicle Speed input 26 GW Stepper “C”
7 GU Water Temperature input 27 BS Ground
8 PY Heated Front  Screen input 28 US Stepper “B”
9 WLG Serial Link 29 O...

13/14CU AND 14CUX SYSTEMS
102 1990-95 Lucas 14 CUX ECM
C243
Heated Oxygen Sensor X139, X160
PIN WIRE
COLORFUNCTION PIN WIRE COL-
ORFUNCTION
1 RG Stepper “D” 21 YB A/C clutch input
2 NO Battery + Main Relay 22 UR AFM Idle trim
3 Y TPS Reference voltage 23 U Lambda Bank “A”
4 B Lambda ground 24 U Lambda Bank “B”
5 BW Tune Resistor (1990 only) 25 RB Sensor “VE”
6 Y Vehicle Speed input 26 GW Stepper “C”
7 GU Water Temperature input 27 BS Signal Ground
8 PY Heated Front Screen input 28 US Stepper “B”
9 WLG...

13/14CU AND 14CUX SYSTEMS
13/14CU and 14CUX Systems 103 3way-Black
Throttle Position Sensor X171 
3way-Black
PIN WIRE
COL-
ORFUNCTION
1.00 WO Heater Power Supply- 12v
2.00 U Sensor Signal- 0.1v to 1.1v 
3.00 B Ground
PIN WIRE
COL-
ORFUNCTION
1.00 RB Signal Ground
2.00 R Sensor Signal
3.00 Y TPS Reference voltage- 5v
12
3
12
3 

13/14CU AND 14CUX SYSTEMS
104 14CUX ECM Tune Summary
Note:When using Tune # R3652, R3653, or R3654 to correct cold start complaints, the entire 
“Cold Start Enhancement” package must also be used (except Defender 110)
See reverse for complete tune listing.
Tune ACpplication
R3652 3.9 litre ‘93-‘95 MY Range Rover Classic
3.9 litre ‘93-‘95 MY Discovery
R3653 4.2 litre ‘93-‘95 MY Range Rover Classic
R3654 3.9 litre ‘94-‘95 MY Defender 90
3.9 litre ‘93 MY Defender 110
R3362 3.9 litre ‘89-‘92 MY Range Rover...

13/14CU AND 14CUX SYSTEMS
13/14CU and 14CUX Systems 105
Model Tune # Description
Range Rover Classic 3.9 Low 
CR R2103 Initial production tune
Range Rover Classic 3.9 Low 
CR R2161 Desensitized OBD, IAC refinements
Range Rover Classic 3.9 Low 
CR R2306 Fixed A/C glitch @ 65 mph (2250rpm); eliminated tune resistor 
(Code 21)
Range Rover Classic 3.9 Low 
CR R2419 Desensitized OBD, , prinarily Code 48;  Service Actioon (Recall 
CA)
Range Rover Classic 3.9 Low 
CR R2665 Improved IAC control, new strategy for...

13/14CU AND 14CUX SYSTEMS
106
Defender 3.9 High CR  R3365 Desensitized OBD 95 MY Tune
Range Rover Classic 4.2  R3507 Part # PRM3361A; Interim improved Cold Start, fueling below -
22âC (- 10âF)
Range Rover Classic/Discovery 
3.9 High CR R3526 Part # PRM3360A; Note: LR Part numbers are different from 
Tune numbers
Defender 3.9 High CR  R3529 Part # PRM3365A
Range Rover Classic/Discovery 
3.9 High CR R3652 Operation Pride Tune
Current tune with final improved Cold Start fueling  below -22âC 
(-10âF)....