TWO-TRIP DETECTION LOGIC
When a malfunction initially occurs, Diagnostic Trouble Code (DTC) will be temporarily stored in ECM memory, but MIL on instrument panel will not illuminate. The second time malfunction is detected, MIL on instrument panel will illuminate, provided ignition is turned off and then back on after first malfunction was detected. This is referred to as the 2-Trip Detection Logic and only applies to specific DTCs.
Note. When road testing vehicle in CHECK mode (Toyota scan tool only), the Two Trip Detection Logic will not function. Also, MIL will illuminate first time a malfunction is detected.
DATA LINK CONNECTOR
OBD-II regulations (SAE J-1850) standardizes Data Link Connector (DLC) configurations. See DATA LINK CONNECTOR (DLC) NO. 3 LOCATION table. (Схема №2)
| Application | Location |
|---|---|
| Paseo | Left Side Of Instrument Panel, Left Of Steering Column |
DATA LINK CONNECTOR (DLC) NO. 3 LOCATION
FREEZE-FRAME DATA
OBD-II or Toyota scan tool can by used to check freeze-frame data. The ECM records engine operating condition when a misfire, fuel trim (mixture) malfunction or other malfunction (fuel system, calculated load, coolant temperature, fuel trim (mixture), engine speed, vehicle speed, etc.) exists. If more than one fault is detected, only data from the first malfunction is recorded. Recorded data is useful for determining conditions in which the malfunction occurs.
NORMAL Mode Code Retrieval
- Connect scan tool to Data Link Connector (DLC) No. 3. (Схема №2) Turn ignition on with engine off. Turn scan tool on. Using scan tool manufacturer's instructions, check for DTCs and freeze-frame data.
- If scan tool displays UNABLE TO CONNECT TO VEHICLE, DLC No. 3 must be checked. See «DLC»(ref-22376-S08535601992001010300000) NO. 3 INSPECTION under SCAN TOOL PROBLEMS. If scan tool does not display UNABLE TO CONNECT TO VEHICLE, go to next step.
- Record any DTCs and freeze-frame data displayed for system diagnosis. If driveability problem exists and no DTCs are present, go to «TESTS W/O CODES»(ref-22378) article for diagnosis by symptom.
- If any DTCs are present, perform «CIRCUIT TEST»(ref-22376-S36831412212001010300000). See «DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION»(ref-22376-S00972461362001010300000) table. For more information on freeze-frame data, see «FREEZE-FRAME DATA»(ref-22376-S04987278182001010300000) under INTRODUCTION. For information on 2-trip detection logic codes, see «TWO-TRIP DETECTION LOGIC»(ref-22376-S01307152842001010300000) under INTRODUCTION.
- After repairs for DTC have been completed, DTCs must be cleared from ECM memory. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-22376-S02083241572001010300000).
SUMMARY
If no diagnostic trouble codes are present, driveability symptoms exist or intermittents exist, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent procedures.
CIRCUIT TESTS
Note. Before performing any diagnostic circuit test, refer to SELF-DIAGNOSTIC SYSTEM for diagnostic system functions and system diagnostic procedures. For component location, see appropriate illustration in THEORY/OPERATION article.
Condition
Vehicle speed must have exceeded 19 MPH at least once. DTC is set when TP sensor output voltage is out of range while vehicle speed is 0-19 MPH. Possible cause is
- Throttle Position (TP) sensor.
DTC P0130 is set when sensor No. 1 voltage remains at .4 volt or more, or .6 volt or less during idle, once engine is at normal operating temperature. Possible causes are
- Heated oxygen sensor.
- Fuel trim.
DTC is set when ECM detects a response time of one second or more from sensor to change from rich to lean, or lean to rich. Possible cause is
- Oxygen sensor.
DTC is set when sensor No. 2 voltage remains at .4 volt or more, or .6 volt or less during vehicle operation (31 MPH or more), once engine is at normal operating temperature. Possible cause is
- Heated oxygen sensor.
DTC is set when either of the following conditions is present
- Sensor heater current draw exceeds 2 amps, or voltage drop of circuit exceeds 5 volts.
- Sensor heater current draw is .25 amps or less.
Possible causes are
- Heated oxygen sensor open or short circuit.
- Heated oxygen sensor heater.
- ECM.
DTCS P0301-P0304 - CYLINDERS NO. 1-4 MISFIRE DETECTED
Note. When 2 or more codes for a misfiring cylinder are recorded repeatedly, but DTC P0300 is not recorded, it indicates that misfires were detected and stored into ECM memory at different times.
Two conditions can cause code to set. These are
- During any particular 200 revolutions of engine, misfiring is detected which can cause catalytic converter overheating and/or damage.
- During any particular 1000 revolutions of engine, misfiring is detected which can cause a deterioration in emission levels.
For possible causes, see DTC P0300 RANDOM MISFIRE DETECTED circuit test.