4AGZE: Trouble codes from ECU-Mark 1 85-89 Models

[mr2tim]

Since I only have an 89 Service Manual does any one know whether all Mark1 Trouble Codes are the same from 85-89?

What are the following? Do they relate to Mark1 mr2's?

TCCS-E
TCCS-L
TCCS-M

How do/can Mark 1 ECU's produce EFI Codes?

[Papo J]

The early MK1 codes are different, here are the procedures and codes.
Check codes with the throttle closed, transmission in neutral, all accessories off, and engine at normal operating temperature.
Turn ignition to ON but do not start,
Short T - E1 on service connector,
The check engine light will flashing indicating the codes.
Normal code is 1 flash every 5 seconds or so.
Fault codes will read in ascending order, - code - 2.5 second pause - code - 2.5 second pause - code, etc. until all codes are read.

1 = Normal (No codes recorded)
2 = AFM signal (Open in VC, VS, VB, or E2 or short in EC)
3 = Ignition signal (no signal from igniter 4 times in a row)
4 = water temp sensor (fault in coolant temp. sensor circuit)
5 = O2 sensor (open in O2 sensor - lean signal only)
6 = RPM signal (No Ne, G signal within several seconds after start)
7 = TPS (circuit fault in TPS signal)
8 = Intake air temp sensor (fault in intake air temp sensor circuit)
9 = (There is no 9)
10 = Starter signal (no STA signal before engine reaches 800 RPM)
11 = Switch signal (AC switch on, TPS idle switch off, or AT shift in D during check)

This is for the early NA MK1s.

[mr2tim]

Thanks Bro, I get an occasional question on the 85's and 86's and wanted to get things straight, evidently starting in 87 and thru to 89 we get the double digit signals.

BTW I've got a 86 NA AT parts car out back I'd sure like to move, know anybody interested in the bits and pieces?

I inventoried my garage after 19 years of racing and street driving, whatta think of my collection?
(Here's some Xmas gift ideas for that someone special.?)

(You pay for shipping from South Florida, 33428.)
Santa takes PayPal, Checks and Money orders!! mr2tim
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Complete 4a-ge engine $500
Clutch Assembly w OEM disc $110
Clutch Assembly w Stage 2 street disc $130
C-52 5 Speed Transmission Complete $400
c-52 5 Speed Transmission Case and 1-4 Gears (only) $200
4a Engine series Intake Manifolds $100
4a Engine Series L&R Valve Covers $30
4a Engine Series A/C comp holders $20
4a A/C Compressors (rebuildable only) $40
4a Engine Series N/A Water Inlets $30
N/A Throttle Assemblies $60 ea
4a-gze Stripped Block $170
4a-ge N/A Cast Crankshaft (requires machining) $60
4a-gze Supercharged Forged Crankshaft (damaged front threads, requires machining) $75
4a-gze Supercharged Intake Manifold $110
4a-gze Supercharged Vacuum loom $40
4a-ge N/A Vacuum Loom $35
4a-ge N/A Coil w Igniter $90
4a-ge N/A Crankshaft Pulley $60
4a-ge N/A Belt Tensioners $35 (w wheel)
4a-ze A/C Compressor stator $45
4a-gze Supercharger Clutch Stator (new!) $260
4a-gze Supercharged Fuel Rail $30
4age N/A Complete Fuel Rail Assembly $35
86 Air Flow Meter -$70
87 Air Flow Meter? (picture available) $70
88-89 4a-gze Supercharged Blow-off Valve Holder $35
88-89 4a-gze Supercharged Throttle Cable Mounting Plate $25
85-89 4a-ge Oil Pump $65
85-89 4a-ge EGR Assembly $50
85-89 4a-ge N/A Rear Crankshaft Seal
85-89 4a-ge 3 point Throttle Cable Mounting Plate
88-89 4a-gze EGR Valve only $35
88-89 4agze Cold Start Holder/Adaptor $20
OEM Cam Pulleys $10
4a-engine series Distributor $100
89-89 4a-gze Throttle Assembly (NO TPS) $60
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85-86 L&R Rear Axle Carriers/Hubs-Complete Assemblies $60 ea
85-86 L&R Half Shafts for Automatic Transmissions $50 ea
85-86 L&R Rear Suspension Lower Control Arms $30 ea
85-86 L&R Rear Strut Rods $25
85-86 L&R Rear Suspension Arms $30 (Tow in adjusters)
85-86 L&R Rear Calipers w Emer Brake Gear $30 ea
85-86 L&R Rear McPherson Struts, Automatic Transmissions $50
85-86 L&R Front Axle Carriers/Hubs-Complete Assemblies $70 ea
85-86 L&R Front Strut Rods $25
85-86 Rack and Pinion Steering Assembly $125
85-86 L&R Front Suspension Lower Control Arms $30 ea
85-86 L&R Front Calipers $25 ea
85-86 L&R Front McPherson Struts, Automatic Transmissions $50
85-86 Dash Pod w A/T switch, Complete $110
Dashboard, Blue Vinyl, $90 (perfect)
Clock(s) $35
85-86 Center A/C Vent $30
Dashboard located Side A/C vents $20 ea
85-86 L&R Headrests, Grey $25 (perfect)
85-86 L&R Manual Doors $125
85-86 L&R Rear Light Assemblies $60
85-86 L&R Sunvisors, Grey fabric (perfect) $45 ea
85-86 A/T Console, Black,very nice condition $90
85-86 Temp Control Assembly $80

L&R Rear Fenders $110 ea
87-89 L&R Electric Doors, Blue Fabric Interiors, No switches, w Glass $250ea ea, Complete w Electric Mirrors and OEM Harnesses

87-89 L&R Rear Axle Carriers/Hubs-Complete Assemblies $60 ea
87-89 L&R Half Shafts for Manual Transmissions $50 ea
87-89 L&R Rear Suspension Lower Control Arms $30 ea
87-89 L&R Rear Strut Rods $25
87-89 L&R Rear Suspension Arms $30 (Tow in adjusters)
87-89 L&R Rear Calipers w Emer Brake Gear $30 ea
87-89 L&R Rear McPherson Struts, Manual Transmissions $50
87-89 L&R Front Axle Carriers/Hubs-Complete Assemblies $70 ea
87-89 L&R Front Strut Rods $25
87-89 Rack and Pinion Steering Assembly $125
87-89 L&R Front Suspension Lower Control Arms $30 ea
87-89 L&R Front Calipers $25 ea
87-89 L&R Front McPherson Struts, Manual Transmissions $50
87-89 L&R Rear Suspension Body Mounting Assembly $35

Windshield plastic Grills $15 ea
Wiper Linkages $30
Wiper Motors $30
M/T shifter cables $40 ea
A/T shifter cable $40
Hood Latches $20
Trunk Latches $20
Engine Cover Latches $15
L&R Engine Bay Side trim Covers $30 ea
L&R Complete A&B Pillars trim Assemblies (whole only) $90 ea
L&R Quarter window Trims (whole only) $40 ea
L&R Front Turn Signals (whole only) $25 ea
L&R Interior Foot trims Covers (blue only) $15
Heater/Blower fans $40
Exhaust Downpipes $50
Complete Fuel pump Assembly $40
Complete Fuel Sender Assembly $40
Manual Transmission Dash Pods Complete $110
Manual Transmission Dash Pods, Plastic Shell only $45
OEM Carpet, Blue $60
OEM Carpet, Black $125 (real nice)
Engine Cooling Fans $40
N/A rubber Intake Snorkel $35
Front Sway Bars $50
Rear Sway Bars $50
87-89 M/T console, Blue $90
87-89 M/T, console, Blue $120 (perfect)
N/A speedometers $90 (several)
87-89 Temp Controls $75
87-89 Side Spoilers, Fiberglass (both-4 pieces only) $125
M/T Shifter Assembly $45
OEM Oil coolers $35
Used Door Hinges $45 (sets only)
L&R Headlight Assemblies $135 (whole only)
L&R Headlights (metal section only) $60
Front Shock Tower Braces $30
Heater Cores $50
Complete Heater Core Assembly $75
87-89 L&R Electric Mirrors $75 ea
Right Manual Door Mirror, Black $45
Rear Trunk Lids 85-87 Standard Bulb Light Type $80
Engine Cover, Steel only $75
Standard Hood $130
Racing Hood, Vented for brake cooling $75
Front Race Bumper,no reinforcement, w/Upper Radiator Support, Very Lightweight $125
Upper Radiator Support $80
AC & Rad Cooling Fans-$60 ea
Various (Front) A/C Condensers (pictures available) $90 ea
2 tier Front grill $45
3 tier Front grill $45
N/A Front Brake Rotors, vented $35
N/A Rear Brake Rotors $30
Lots of OEM Cooling Hoses
Passenger Side, Electric Door Switches $40
A/C Compressor Hook-up Hoses $20
Sunroof Glass (Roof Glass) $90
Sunroof Glass Hardware $30
Front Trunk mounted heater switch assembly $30
Used Motor Mounts $15
Rear Console Compartment, Blue $15
Rear Console Compartment, Black $15
Rear Mud Flaps $25 ea

[Papo J]

That's quite a collection ...
Here are the codes for the 88-89 MK1 including the SC.

1988 – 1989 4AGE
Code No.
12. RPM signal
13. RPM signal
14. Ignition signal
21. Oxygen sensor signal/oxygen sensor heater
22. Water temperature sensor signal
24. Intake air temperature sensor signal
25. Air-fuel ratio lean malfunction
26. Air-fuel ratio rich malfunction
31. Air flow meter signal
41. Throttle position sensor signal
42. Vehicle speed sensor signal
43. Starter signal
51. Switch signal
71. EGR system malfunction

1988 – 1989 4AGZE
Code No.
11. ECU (+B)
12. RPM signal
13. RPM signal
14. Ignition signal
21. Oxygen sensor signal/oxygen sensor heater
22. Water temperature sensor signal
24. Intake air temperature sensor signal
25. Air-fuel ratio lean malfunction
26. Air-fuel ratio rich malfunction
31. Air flow meter signal
32. Air flow meter signal
41. Throttle position sensor signal
42. Vehicle speed sensor signal
43. Starter signal
51. Switch signal
52. Knock sensor signal
53. Knock control signal in ECU
71. EGR system malfunction

[mr2tim]

Real good post my friend. Very smart!

[agepag]

Whats a switch signal, code 51 mean?

[Papo J]

That just means that the AC switch was on during the diagnostic test.

[agepag]

Hmmm, the ac switch is not on?

[Papo J]

Remove the EFI fuse or battery cable and reset the ECU.

[agepag]

Still getting a code 51? No a/c on, but my o2 sensor looks like its shot and the car misfires pretty bad. I changed the cap and rotor and spark plugs.

Just to be clear, I have and 88 S/C so codes 1-12 are for earlier MR2's and 11-71 are for 4AGZE. I was looking at a repair manual for an 87 and it only showed codes 1-12, and I was getting 2 and 5 which are AFM and o2 sensor, but once I clear the codes and start my car and re-do I get 5 - 1. Any suggestions?

[mr2tim]

I also have alot this erroneous code #51's when all my a/c functions are switched off or not connected.

I'm sure there's a story here, but till I hear one I ignore this.

Originally Posted by agepag

Still getting a code 51? No a/c on, but my o2 sensor looks like its shot and the car misfires pretty bad. I changed the cap and rotor and spark plugs.

Just to be clear, I have and 88 S/C so codes 1-12 are for earlier MR2's and 11-71 are for 4AGZE. I was looking at a repair manual for an 87 and it only showed codes 1-12, and I was getting 2 and 5 which are AFM and o2 sensor, but once I clear the codes and start my car and re-do I get 5 - 1. Any suggestions?

[agepag]

Well my car is running very rich, I didn't have a cat, just a test pipe and when I removed it it was full of black sut, it was caked in there. Also the car misfires pretty bad. I chenaged the cap, rotor and plugs. THe search continues!

[agepag]

Ok decided to put the o2 sensor back, started the car, let it run then shut it off and read the codes, 21,51,52. Reset the ecu and read the codes again, 51 only, but if I start the car I am sure I will get the 21, 52 again. So I am going to change the o2 sensor, hoping it will fix the bad mis-fire and clear the codes. I will keep every one posted.

[Papo J]

You were probably getting the code 21 because the sensor was unplugged, the 52 means your knock sensor is either not connected or bad.

[agepag]

Where exatly is the knock sensor? And could this also cause the car to have the misfire and run rich?

[Papo J]

It's on the block below the intake manifold between cylinders 3 & 4.

[CJMR2T]

Even though this thread is a week or so old, just wanted to add that the 51 (switch signal) is not solely the a/c switch. A TPS that is not adjusted correctly will trigger a 51 too. If the IDL signal is not grounded during diagnostics (pulling codes) the 51 will be present.

[agepag]

Well I have cleared all my codes except 51. I took the car for a drive today and it ran like crap. Burns abit of oil, but I did a compression test and basically 140 across the board. THe car miss fires alot, from idel all the way up as you rev it? Maybe its the TPS? I also cannot build boost, but I think thats a bad sc belt. Any other suggestion.

[toyotaspeed90]

Originally Posted by Papo J

Remove the EFI fuse or battery cable and reset the ECU.

I'm intrigued by this because I don't think I've ever seen an AW11 store a code.... typically you see the CEL flash when driving... get it home, shut it down... and then it doesn't repeat -- since nothing is stored it won't give you the code.

and by "1" flash that just means a steady flash with no longer/shorter pauses = normal.


to test the tps... simply unplug it. You'll throw another code (or codes) but the ecu will go into a mode that doesn't require the tps.... if the tps is faulty it will actually run a LOT better without it. If it isn't faulty, you won't really notice much of a change.