Malaysia
Boleh Results References
17th December 2003
Taken from 4AG-E 20Valve Engine Repair Manual page FI-30
REFERENCE VALUE OF ENGINE ECU DATA (20v MAP aka "blacktop")
HINT: Engine ECU data can be monitored by hand-held tester.
Please refer to the hand-held tester operator's manual for further details.
(Engine at normal operating temp.)
| Item | Inspection condition | Reference value |
| INJECTOR | Engine cold to hot | Gradually decreases |
| Engine idling at normal operating temp. *1 | Approx. 3-4 msecs | |
| IGNITION | Increase engine speed | Gradually increases |
| ISC DUTY | Engine idling at normal operating temp. *1 | Approx. 29-39% |
| A/C Switch ON | Duty ratio increase | |
| A/T shifting in "D" position | Duty ratio increase | |
| ENGINE PSD | RPM kept stable (Comparison with tachometer) | No great changes |
| INTAKE MAN | Engine idling at normal operating temp. *1 | Approx. 160-350 mmHg |
| Increase engine speed | Gradually increases | |
| COOLANT TEMP | Engine at normal operating temp. | 75-95 Celsius (167-203 Fahrenheit) *2 |
| THROTTLE | Closed throttle position | Below 5 degrees |
| Wide open throttle | Above 70 degrees | |
| From closed throttle position to wide open throttle | Gradually increases | |
| VEHICLE SPD | During driving (Comparison with speedometer) | No large differences |
| TARGET A/F L | Engine idling at normal operating temp. | 2.5 +/- 0.7V *3 |
| A/F FB LEFT | RPM stable at 2,500 rpm with normal operating temp. | ON |
| KNOCK FB | Depress throttle pedal suddenly during idling | ON |
| STA SIGNAL | During cranking | ON |
| IDL SIGNAL | Closed throttle position | ON |
| A/C SIGNAL | A/C Switch ON | ON |
| Ox L | RPM stable at 2,500 rpm with normal operating temp. | RICH LEAN is repeated |
*1: All accessories and A/C are switch OFF.
*2 If the engine coolant temp. sensor circuit is open or shorted, the engine ECU assumes an engine coolant temp. value of 80 Celsius ( 176 Fahrenheit).
*3 When feedback control is forbidden, 0 V is displayed.
The application conversion for use with 20v AFM aka "Silvertop" are "guessed" as follows: -
INTAKE MAN = Intake Manifold Vacuum to be replace by Air Flow Meter's Flap voltage. Operation of AFM is 5V to (zero) 0V. Therefore at idling is assumed between 4V to 3V and reduces as engine increase rpm.
Other issues
It is only known now that the TPS can have such a high tolerance. Below 5 degrees when throttle is fully closed.
TARGET A/F L = mine is 0V, oh shxt :( no closed-loop fuel delivery optimisation / compensation :( mah ha ha ha ha ha
The O2 sensor needs to be changed :( meh eheh heh eh hheh ehe mind as well take it out and throw away. Now where to find a camry and sneak under it to steal a O2 sensor :) hehehehehe hahahahah muah ha ha hahah ha ha. Don't tell anyone :) hehehehehehe
Ox L = mine is unknown :( meh eheh heh eh hheh ehe
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