NOTE: Not all trouble codes will activate MIL (CHECK ENGINE light) NOTE: Not all trouble codes will activate MIL (CHECK ENGINE light) •
• Before Before proceeding, proceeding, make make sure sure the:the: o
o CHECK CHECK ENGINE ENGINE light light circuit circuit is is functional. functional. It It should should be be ON ON when when the the ignition ignition switchswitch is ON with the engine stopped.
is ON with the engine stopped. o
o Battery Battery voltage voltage is is above above 11 11 volts.volts. o
o Throttle Throttle valve valve is is fully fully closed closed (Throttle (Throttle Position Position Sensor Sensor IDL IDL points points closed).closed). o
o Accessory Accessory switches switches (A/C, (A/C, etc.) etc.) are are OFF.OFF. o
•
• Turn Turn ignition ignition switch switch to to ON ON position.position. o
o Do Do not not start start the the engine.engine. o
o Place Place a a jumper jumper wire wire across across TE1 TE1 and and El El terminals terminals in in engine engine check check connector.connector. (Or connect the TE1 pin via a wire to ground, best i
(Or connect the TE1 pin via a wire to ground, best if thats the engine itself, even if it'sf thats the engine itself, even if it's only through a wire.
only through a wire. •
• Count Count number number of of flashes flashes from from CHECK CHECK ENGINE ENGINE light.light. o
o If If system system is is operating operating normally normally (with (with no no detected detected faults), faults), the the CHECK CHECK ENGINEENGINE light will blink continuously
light will blink continuously
and evenly about 2 times a second. and evenly about 2 times a second. •
• Otherwise, Otherwise, the the light light will will blink blink a a number number of of times times equal equal to to the the trouble trouble code code asas follows:
follows: o
o The The light light blinks blinks only only (.5 (.5 second second ON, ON, .5 .5 second second OFF) OFF) when when indicating indicating a a number.number. o
o The The light light will will be be OFF OFF for for 1.5 1.5 seconds seconds between between the the first first digit digit and and the the second second digitdigit of the code.
of the code. o
o If If more more than than one one code code is is stored, stored, the the light light will will be be OFF OFF for for 2.5 2.5 seconds seconds before before thethe next code is displayed.
next code is displayed. o
o Once Once all all code(s) code(s) have have been been displayed, displayed, the the light light will will be be OFF OFF for for 4.5 4.5 seconds seconds andand then the whole sequence will repeat.
then the whole sequence will repeat. •
• The The diagnostic diagnostic code code series series will will continue continue to to repeat repeat as as long long as as the the check check connecterconnecter terminals TEl and El are connected.
terminals TEl and El are connected. •
• When When finished, finished, remove remove the the jumper jumper wire wire (or (or wire wire connection connection to to TE1)TE1) •
• After After repairing repairing the the malfunction, malfunction, clear clear the the codes codes from from the the ECUs ECUs memory.memory.
Clearing Trouble Codes Clearing Trouble Codes
All trouble codes must be purged from the ECUs memory after repairing the faults. All trouble codes must be purged from the ECUs memory after repairing the faults. Otherwise, code(s) would remain in the ECUs memory indefinitely and would appear Otherwise, code(s) would remain in the ECUs memory indefinitely and would appear along with a new code in the event of a future problem.
along with a new code in the event of a future problem. •
• Remove Remove the the EFI EFI fuse fuse (15A) (15A) for for 30 30 seconds seconds with with the the ignition ignition switch switch OFF OFF to to clearclear any codes. It may take longer than 30 seconds, depending
any codes. It may take longer than 30 seconds, depending on ambient temperature (theon ambient temperature (the lower the temperature, the longer the fuse must be left out).
lower the temperature, the longer the fuse must be left out). •
• Trouble Trouble codes codes can can also also be be cleared cleared by by disconnecting disconnecting the the vehicle vehicle battery. battery. However,However, other memory functions (clock, radio, etc.), will need to be reset.
other memory functions (clock, radio, etc.), will need to be reset. •
• After After the the codes codes are are cleared, cleared, road road test test the the vehicle vehicle (as (as applicable applicable for for the the fault) fault) andand recheck if any codes reset. If so, it i
recheck if any codes reset. If so, it i ndicates that the trouble area has not been resolved.ndicates that the trouble area has not been resolved.
Note: anything that starts with a single digit is pretty much serious bar a few of them. Note: anything that starts with a single digit is pretty much serious bar a few of them.
OBD1 Codes OBD1 Codes
The serious codes. The serious codes. 1 Normal Condition 1 Normal Condition
(this single blink, which is not something you would normally see on a converted engine) (this single blink, which is not something you would normally see on a converted engine) 2 Air Flow Meter signal. (will not stop it running, ECU will default to base map)
2 Air Flow Meter signal. (will not stop it running, ECU will default to base map) 3 Ignition signal.
3 Ignition signal.
4 Engine Coolant Temperature Sensor signal. (may rob power as engine will
4 Engine Coolant Temperature Sensor signal. (may rob power as engine will use baseuse base map)
map)
5 Oxygen Sensor. (may rob power as engine will use base map) 5 Oxygen Sensor. (may rob power as engine will use base map) 6 RPM signal (Crank Angle Pulse). (critical: engine should not run) 6 RPM signal (Crank Angle Pulse). (critical: engine should not run) 7 Throttle Position Sensor signal. (critical: engine should not run) 7 Throttle Position Sensor signal. (critical: engine should not run)
8 Intake Air Temperature Sensor signal. (will not stop it running, may rob power as 8 Intake Air Temperature Sensor signal. (will not stop it running, may rob power as engine will use base map)
engine will use base map) 9 Vehicle Speed Sensor signal. 9 Vehicle Speed Sensor signal. 10 Starter signal. 10 Starter signal. 11 Switch signal. 11 Switch signal. 11 ECU/ECM. 11 ECU/ECM.
12 Knock Control Sensor signal. (no effect to running, good to resolve) 12 Knock Control Sensor signal. (no effect to running, good to resolve) 12 RPM signal. (critical: engine should not run)
12 RPM signal. (critical: engine should not run) 13 Knock Control CPU (ECM). (no effect to
13 Knock Control CPU (ECM). (no effect to running, good to resolve)running, good to resolve)
13 RPM signal. (critical: engine should not run: 1uz-fe uses this signal to apply ignition 13 RPM signal. (critical: engine should not run: 1uz-fe uses this signal to apply ignition and fuel tables, without it, the ecu has no idea where to begin.)
and fuel tables, without it, the ecu has no idea where to begin.) 14 Turbocharger Pressure. (ignore for 1uz-fe)
14 Turbocharger Pressure. (ignore for 1uz-fe) 14 Ignition signal.
14 Ignition signal.
The not so serious codes The not so serious codes
21 Left Oxygen Sensor. (resolve it, but it will run without it in base map.) 21 Left Oxygen Sensor. (resolve it, but it will run without it in base map.)
22 Engine Coolant Temperature Sensor signal. (will not stop it running, will rob power, 22 Engine Coolant Temperature Sensor signal. (will not stop it running, will rob power, note: this is ECU temp sensor, not the dash one, there are two, this is the two wire one note: this is ECU temp sensor, not the dash one, there are two, this is the two wire one more central at the front. )
more central at the front. )
23 Intake Air Temperature Sensor signal. (will not stop it running, may rob power as 23 Intake Air Temperature Sensor signal. (will not stop it running, may rob power as engine will use base map)
engine will use base map)
24 Intake Air Temperature Sensor signal. (will not stop it running, may rob power as 24 Intake Air Temperature Sensor signal. (will not stop it running, may rob power as engine will use base map)
engine will use base map)
25 Air-Fuel Ratio Lean. (resolve this) 25 Air-Fuel Ratio Lean. (resolve this) 26 Air-Fuel Ratio Rich. (resolve this) 26 Air-Fuel Ratio Rich. (resolve this) 27 Right Oxygen Sensor signal. 27 Right Oxygen Sensor signal.
28 Left Secondary (Sub) Oxygen Sensor signal.
(good to resolve: it's thought this might engage base map, see four o2 section for how to trick the ecu into thinking it has four when it only has two, and thus clearing this code.)
29 Right Secondary (Sub) Oxygen Sensor sig nal.
(good to resolve: it's thought this might engage base map, see four o2 section for how to trick the ecu into thinking it has four when it only has two, and thus clearing this code.)
31 Air Flow Meter signal (Vacuum Sensor signal). (will n ot stop it running, may rob power as engine will use base map)
32 Air Flow Meter signal. (will not stop it running, may rob power as engine will use base map)
34 Turbocharger Pressure signal. (ignore for 1uz-fe)
35 Turbocharger Pressure Sensor signal. (ignore for 1uz-fe) 35 HAC Sensor signal.
41 Throttle Position Sensor signal. (critical: resolve) 42 Vehicle Speed Sensor signal. (no effect to running)
47 If you have deleted the traction control and su b throttle sensor you may get code 47, What you need to do to clear the code is to earth IDL2 and bridge VC to VTA2. This should fix the code. WARNING: Other effects from this method are unknown.
43 Starter signal. 51 Switch signal.
52 Knock Sensor signal. 53 Knock Sensor signal. 54 Inter-cooler ECM signal.
56 Hydrostatic Fan not connected.
59 Automatic Transmission Temp voltage (high out or of range) ? 71 EGR System.
72 Fuel Cut Solenoid signal. 78 Fuel Pump Control signal.
81 TCM Communication. (will show up when no automatic trans is in place on crown majesta stand alone and other pre 95' ecus)
83 TCM Communication. (will show up when no automatic trans is in place on crown majesta stand alone and other pre 95' ecus)
84 TCM Communication. (will show up when no automatic trans is in place on crown majesta stand alone and other pre 95' ecus)
85 TCM Communication. (will show up when no automatic trans is in place on crown majesta stand alone and other pre 95' ecus)