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4ws
- Vtecmec
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Copied from Mataos post on PUK.
How to get Prelude CEL codes and what they mean
(Thanks to Schwarzpm)
Get a paperclip and bend it into a U shape.
Make sure the engine’s off and look behind the centre console near the clutch pedal for the service connector; it’s a little (normally) blue connector with 2 wires attached.
Insert the paperclip into the connector to short the 2 wires.
Now turn on the ignition but don’t start the engine, so the dash warning lights light up.
If the CEL light on the dash stays on permanently there are no CEL problems.
If it starts to flash you’ll need to make a note of how many flashes there are.
The CEL light will flash in a loop if there is more than 1 problem
Short flashes mean 1
Long flashes mean 10
Copied from Confused post on PUK.
4WS Error Codes
Thanks to JohnnyB and Confused
Code:
Code System Point Terminals Affected
No code - - 7&23 CU, HC
No code - - 18,25,4,2,16&24 CU, HC, A
10 Sub Steering Angle Sensor Front 22,26 CU, FSSAS, HC
11 Sub Steering Angle Sensor Rear 29,17 CU, RSSAS, HC
12 Sub Steering Angle Sensor Front 26,21 CU, FSSAS, HC
13 Sub Steering Angle Sensor Rear 17,28 CU, RSSAS, HC
14 Sub Steering Angle Sensor Front - CU - Replace 4WS Control Unit
15 Sub Steering Angle Sensor Rear - CU - Replace 4WS Control Unit
16 Sub Steering Angle Sensor Front 22,26,21 CU, FFSAS, HC
17 Sub Steering Angle Sensor Rear 29,17,28 CU, RSSAS, HC
18 Sub Steering Angle Sensor - - CU - Replace 4WS Control Unit
20 Main Steering Angle Sensor Front 8,15 CU, FSSAS, FMSAS, HC
21 Main Steering Angle Sensor Rear 6,13 CU, RSSAS, RMSAS, HC
22 Main Steering Angle Sensor Front 8,15 CU, FSSAS, FMSAS, HC
23 Main Steering Angle Sensor Rear 6,13 CU, RSSAS, RMSAS, HC
24 Main Steering Angle Sensor Front 8,15 CU, FSSAS, FMSAS, HC
25 Main Steering Angle Sensor Rear 6,13 CU, RSSAS, RMSAS, HC
26 Main Steering Angle Sensor Front - CU - Replace 4WS Control Unit
27 Main Steering Angle Sensor Rear - CU - Replace 4WS Control Unit
28 Main Steering Angle Sensor Front 12 CU, FSSAS, FMSAS, HC
29 Main Steering Angle Sensor Rear 20 CU, RSSAS, RMSAS, HC
30 Wheel Speed Front 19 CU, FWSS, HC
31 Wheel Speed Rear L 3 CU, RLWSS, ABSCU, HC
32 Wheel Speed Rear R 1 CU, RRWSS, ABSCU, HC
33 Wheel Speed Rear RorL 3,1 CU, ABSCU, HC
34 Wheel Speed Front 19 CU, FWSS, HC
35 Wheel Speed Rear L 3 CU, RLWSS, ABSCU
36 Wheel Speed Rear R 1 CU, RRWSS, ABSCU, HC
37 Wheel Speed Rear L - CU - Replace 4WS Control Unit
38 Wheel Speed Vehicle Speed - CU - Replace 4WS Control Unit
40 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
41 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
42 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
43 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
44 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
45 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
46 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
50 Control Logic Motor Lock C+,D- CU, RAM, HC
51 Control Logic Wheel Caught In Ditch C+,D- CU, RAM, HC
60 Power Unit Motor C+&D-,33+&34- CU, RAM, PSH, HC
61 Power Unit - C+&D- CU, RAM, PSH, HC
62 Power Unit Motor 33+&34- CU, RAM, PSH, HC
63 Power Unit - - CU, RAM, PSH, HC
64 Power Unit 4WS Control Unit - CU - Replace 4WS Control Unit
65 Power Unit 4WS Control Unit - CU - Replace 4WS Control Unit
70 Temporary Driving Conditions - 25 CU, HC - Check Symptoms / Conditions
71 Temporary Driving Conditions - - CU - Check Symptoms / Conditions
72 Temporary Driving Conditions - 4 CU, HC - Check Symptoms / Conditions
73 Temporary Driving Conditions - - CU, A - Check Symptoms / Conditions
74 Temporary Driving Conditions - 14 CU, PB, HC - Check Symptoms / Conditions
Key:
FSSAS - Front Sub Steering Angle Sensor
RSSAS - Rear Sub Steering Angle Sensor
FMSAS - Front Main Steering Angle Sensor
RMSAS - Rear Main Steering Angle Sensor
FWSS - Front Wheel Speed Sensor
RLWSS - Rear Left Wheel Speed Sensor
RRWSS - Rear Right Wheel Speed Sensor
ABSCU - ABS Control Unit
CU - 4WS Control Unit
RAM - Rear Actuator Motor
PSH - Power System Harness
A - Alternator
PB - Parking Brake
HC - Harness Connector
Credit goes to JohnnyB who actually took this information out of the service manual originally, I've just tidied it up and put it into tabular form!
How to get Prelude CEL codes and what they mean
(Thanks to Schwarzpm)
Get a paperclip and bend it into a U shape.
Make sure the engine’s off and look behind the centre console near the clutch pedal for the service connector; it’s a little (normally) blue connector with 2 wires attached.
Insert the paperclip into the connector to short the 2 wires.
Now turn on the ignition but don’t start the engine, so the dash warning lights light up.
If the CEL light on the dash stays on permanently there are no CEL problems.
If it starts to flash you’ll need to make a note of how many flashes there are.
The CEL light will flash in a loop if there is more than 1 problem
Short flashes mean 1
Long flashes mean 10
Copied from Confused post on PUK.
4WS Error Codes
Thanks to JohnnyB and Confused
Code:
Code System Point Terminals Affected
No code - - 7&23 CU, HC
No code - - 18,25,4,2,16&24 CU, HC, A
10 Sub Steering Angle Sensor Front 22,26 CU, FSSAS, HC
11 Sub Steering Angle Sensor Rear 29,17 CU, RSSAS, HC
12 Sub Steering Angle Sensor Front 26,21 CU, FSSAS, HC
13 Sub Steering Angle Sensor Rear 17,28 CU, RSSAS, HC
14 Sub Steering Angle Sensor Front - CU - Replace 4WS Control Unit
15 Sub Steering Angle Sensor Rear - CU - Replace 4WS Control Unit
16 Sub Steering Angle Sensor Front 22,26,21 CU, FFSAS, HC
17 Sub Steering Angle Sensor Rear 29,17,28 CU, RSSAS, HC
18 Sub Steering Angle Sensor - - CU - Replace 4WS Control Unit
20 Main Steering Angle Sensor Front 8,15 CU, FSSAS, FMSAS, HC
21 Main Steering Angle Sensor Rear 6,13 CU, RSSAS, RMSAS, HC
22 Main Steering Angle Sensor Front 8,15 CU, FSSAS, FMSAS, HC
23 Main Steering Angle Sensor Rear 6,13 CU, RSSAS, RMSAS, HC
24 Main Steering Angle Sensor Front 8,15 CU, FSSAS, FMSAS, HC
25 Main Steering Angle Sensor Rear 6,13 CU, RSSAS, RMSAS, HC
26 Main Steering Angle Sensor Front - CU - Replace 4WS Control Unit
27 Main Steering Angle Sensor Rear - CU - Replace 4WS Control Unit
28 Main Steering Angle Sensor Front 12 CU, FSSAS, FMSAS, HC
29 Main Steering Angle Sensor Rear 20 CU, RSSAS, RMSAS, HC
30 Wheel Speed Front 19 CU, FWSS, HC
31 Wheel Speed Rear L 3 CU, RLWSS, ABSCU, HC
32 Wheel Speed Rear R 1 CU, RRWSS, ABSCU, HC
33 Wheel Speed Rear RorL 3,1 CU, ABSCU, HC
34 Wheel Speed Front 19 CU, FWSS, HC
35 Wheel Speed Rear L 3 CU, RLWSS, ABSCU
36 Wheel Speed Rear R 1 CU, RRWSS, ABSCU, HC
37 Wheel Speed Rear L - CU - Replace 4WS Control Unit
38 Wheel Speed Vehicle Speed - CU - Replace 4WS Control Unit
40 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
41 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
42 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
43 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
44 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
45 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
46 4WS Control Unit 4WS Control Unit - CU - Replace 4WS Control Unit
50 Control Logic Motor Lock C+,D- CU, RAM, HC
51 Control Logic Wheel Caught In Ditch C+,D- CU, RAM, HC
60 Power Unit Motor C+&D-,33+&34- CU, RAM, PSH, HC
61 Power Unit - C+&D- CU, RAM, PSH, HC
62 Power Unit Motor 33+&34- CU, RAM, PSH, HC
63 Power Unit - - CU, RAM, PSH, HC
64 Power Unit 4WS Control Unit - CU - Replace 4WS Control Unit
65 Power Unit 4WS Control Unit - CU - Replace 4WS Control Unit
70 Temporary Driving Conditions - 25 CU, HC - Check Symptoms / Conditions
71 Temporary Driving Conditions - - CU - Check Symptoms / Conditions
72 Temporary Driving Conditions - 4 CU, HC - Check Symptoms / Conditions
73 Temporary Driving Conditions - - CU, A - Check Symptoms / Conditions
74 Temporary Driving Conditions - 14 CU, PB, HC - Check Symptoms / Conditions
Key:
FSSAS - Front Sub Steering Angle Sensor
RSSAS - Rear Sub Steering Angle Sensor
FMSAS - Front Main Steering Angle Sensor
RMSAS - Rear Main Steering Angle Sensor
FWSS - Front Wheel Speed Sensor
RLWSS - Rear Left Wheel Speed Sensor
RRWSS - Rear Right Wheel Speed Sensor
ABSCU - ABS Control Unit
CU - 4WS Control Unit
RAM - Rear Actuator Motor
PSH - Power System Harness
A - Alternator
PB - Parking Brake
HC - Harness Connector
Credit goes to JohnnyB who actually took this information out of the service manual originally, I've just tidied it up and put it into tabular form!
- 4thgenphil
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- rob quilter
- Supporter 2014
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This!mercutio wrote:just pull the codes and fix the issue its never expensive to fix it it will be a sensor or something
Much cheaper and easier than doing a 2ws conversion. As others have said, avoid fast cornering until the issue is fixed.
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- nucleustylzlude
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- nucleustylzlude
- Moderator
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- indigolemon
- The Chaos Engine
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Just a heads up chaps, there are two types of sensors in use. Single bolt, and twin bolt mounting. Check which one you need/have to avoid the swearing after (been there, done that
).

'On two occasions I have been asked, 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question.' - Charles Babbage